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KHU BIỆT THỰ VÀ KHÁCH SẠN BIỂN ĐÔNG PHƯƠNG ĐỊA ĐIỂM : ĐƯỜNG TRƯỜNG SA – PHƯỜNG HÒA HẢI – QUẬN NGŨ HÀNH SƠN – TP. ĐÀ NẴNG – VIỆT NAM

CƠ QUAN PHÊ DUYỆT

Ngày

tháng

năm

CHỦ ĐẦU TƯ Công ty TNHH Biệt thự và Khách Sạn Biển Đông Phương

Ngày tháng Tổng Giám Đốc

năm

Đường Trường Sa – Phường Hòa Hải – Quận Ngũ Hành Sơn – TP. Đà Nẵng – Việt Nam

ĐƠN VỊ TƯ VẤN CƠ ĐIỆN Công ty TNHH AURECON Việt Nam

Ngày 04 tháng 08 năm 2016 Tổng Giám Đốc

P.1304 Tòa Nhà Centec, 72-74 NTMK, Quận 3, TP. Hồ Chí Minh

KHU BIỆT THỰ VÀ KHÁCH SẠN BIỂN ĐÔNG PHƯƠNG

Document control record Document prepared by: Aurecon (Vietnam) Co Ltd Suite 1304 Centec Tower 72-74 Nguyen Thi Minh Khai District 3 Ho Chi Minh City Vietnam

T F E W

+84 8 3823 9994 +84 8 3824 6880 [email protected] aurecongroup.com

A person using Aurecon documents or data accepts the risk of: Using the documents or data in electronic form without requesting and checking them for accuracy against the original hard copy version. Using the documents or data for any purpose not agreed to in writing by Aurecon.

Document control Report title

TECHNICAL SPECIFICATION - ELECTRICAL SERVICES

Document ID

Project number

248779

File path

P:\248779 Oriental Sea Villa & Hotel Resort\3.Project Delivery\Working\MEP\Specifications\01. Elec\01. 248779-Oriental Sea Villa & Hotel ResortElec Spec. (EN) Rev.02.docx

Client

ORIENTAL SEA VILLAS AND HOTEL RESORT Co.Ltd

Client contact

Date

Revision details/status

Prepared by

Author

Verifier

Approver

30 June 2016

Issued for Detail Design

4 August 2016

Issued for Detail Design

Rev

Current revision

Approval Author signature

Approver signature

Name

Phuc Do

Name

Tuyen Bui

Title

Associate

Title

Country Manager

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page i

Contents 1

SCOPE OF WORK

1.1

Project Description

1.2

Services Description

1.3

Definition Of Terms

1.4

Extent Of Work

CO-ORDINATION AND WORK BY MAIN CONTRACTOR

2.1

Co-Ordination

2.2

Works By Main Contractor

SPECIFIC PROJECT REQUIREMENTS

3.1

Design Requirements

3.2

System controls and operation

GENERAL REQUIREMENTS

4.1

Site Inspection

4.2

Statutory Requirements And Standards

4.3

Warranties

4.4

Specification And Drawings

4.5

Discrepancies & Omissions

4.6

Setting Out Openings And Making Good

4.7

Positioning Of Outlets And Equipment

4.8

Co-Ordination of Installation

4.9

Performance and Guarantee

4.10 Shop Drawings

4.11 As - Installed Drawings

4.12 Equipment Deviations

4.13 Packaged Equipment

4.14 Samples And Prototypes

4.15 Radio Interference

4.16 Labelling

4.17 Workmanship And Materials

4.18 Power Factor, Balancing & Voltage Drop

4.19 Earthing

4.20 Colour Coding

ASSOCIATED WORK AND TERMINATION POINTS

5.1

Associated Work

5.2

Building Work

16 Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page ii

5.3

Schedule of Termination Points

5.4

Electricity Supply

5.5

Medium Voltage Switchboard

5.6

Medium voltage feeder cabling

5.7

Transformer

5.8

Compact Substation

5.9

LV Mains Cabling

5.10 Generator

5.11 Synchronizing Control Panel

5.12 Main Distribution Board

5.13 Metering Facilities

5.14 Surge Suppression Equipment

5.15 Submains Distribution

5.16 Distribution Boards

5.17 Uninterruptible Power Supply

5.18 Power Factor Correction Unit

5.19 Harmonics and Voltage Disturbances

5.20 General Lighting System

5.21 General lighting control systems

5.22 Emergency Lighting System

5.23 General Purpose Power

5.24 Lighting and General Purpose Power Wiring

5.25 Cable Ladders, Trays and Conduits

5.26 Mobile Phone Coverage

5.27 Earthing

5.28 Lightning Protection System

5.29 Submissions

5.30 Testing and Commissioning

5.31 Warranty and Defects Liability

5.32 Maintenance

WIRING AND ACCESSORIES

6.1

General

6.2

Cross Reference

6.3

Conductors and Cables

6.4

Wiring Enclosures and Cable Supports

6.5

Underground Services

6.6

Accessories

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page iii

BUSWAY

7.1

General

7.2

General Requirements

7.3

Technical Data

7.4

Components

LV SWITCHBOARDS

8.1

General

8.2

Components

8.3

Quality

8.4

Switchboard Assemblies

8.5

Transient Protection

8.6

Arrangements for Sub-Main Distribution Boards

8.7

Arrangements For Distribution Boards

8.8

Arrangements For Circuit Breaker Tap Off Units

8.9

Arrangements For Marshalling Cubicles

8.10 Proprietary Assemblies

8.11 Busbars

8.12 Main Switches

8.13 Circuit Breakers

8.14 Internal Wiring

8.15 Measurement Accessories

8.16 Switchgear Accessories

8.17 Current Transformers (Protection)

8.18 Ancillary Equipment

8.19 Installation

8.20 Marking

8.21 Completion

AUTOMATIC TRANSFER SWITCHES

9.1

Related Documents

9.2

References

9.3

Submittals

9.4

Construction

9.5

Operation Sequence

LUMINAIRES

10.1 General

10.2 Quality

10.3 Luminaires

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page iv

10.4 Lamps

10.5 Installation

EMERGENCY LIGHTING

11.1 General

11.2 Quality

11.3 Components

11.4 Completion

EARTHING

12.1 General

12.2 Quality

12.3 Components

LIGHTNING PROTECTION SYSTEM

13.1 General

13.2 Quality

13.3 System Compositions

13.4 Installation

13.5 Testing

13.6 Additional testing

POWER FACTOR CORRECTION

14.1 General

14.2 General Requirements

14.3 System Parameters

100

14.4 Components

100

14.5 Safety

103

14.6 Equipment Operation

103

14.7 Quality

104

14.8 Assemblies

104

14.9 Proprietary Assemblies

104

14.10 Busbars

104

14.11 Main Switches

105

14.12 Circuit Breakers

105

14.13 Internal Wiring

105

14.14 Measurement Accessories

105

14.15 Control Gear

105

14.16 Control Gear Accessories

105

14.17 Ancillary Equipment

105

14.18 Installation

105

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page v

14.19 Marking

105

14.20 Completion

105

DIESEL GENERATOR

106

15.1 General

106

15.2 Quality

106

15.3 Internal Combustion Engine

107

15.4 Alternator

109

15.5 Operation

110

15.6 Control Panels

111

15.7 Batteries and Chargers

112

15.8 Starting

113

15.9 Installation

114

15.10 Marking

116

15.11 Completion

117

UPS

120

16.1 General

120

16.2 Quality

121

16.3 Components

123

16.4 Control and Monitoring

125

16.5 Batteries

126

16.6 Installation

127

16.7 Completion

127

PUBLIC ADDRESS SYSTEM

129

17.1 General Requirements

129

17.2 Equipment

129

17.3 Conduit and wiring

132

BUILDING MANAGEMENT SYSTEM (BMS)

133

18.1 System Objectives

133

18.2 General

133

18.3 System

134

18.4 Field Controllers

135

18.5 Data Monitoring and Logging

136

18.6 Internal Power Backup

137

18.7 System Communications

137

18.8 Control Circuits

137

18.9 Sensors

137

18.10 Signals

137

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page vi

PAINTING AND FINISHING

140

19.1 General

140

19.2 Colour Code

140

TESTING AND COMMISSIONING

141

20.1 General

141

20.2 Test Instruments

141

20.3 Test Report Terms

142

20.4 Commissioning

142

SERVICE AND MAINTENANCE

143

21.1 Scope

143

21.2 Service

143

21.3 Service Reports

143

21.4 Maintenance Schedules

143

OPERATING AND MAINTENANCE MANUALS

145

22.1 General

145

22.2 Manual Contents

145

22.3 As Installed Drawings

146

22.4 Principal Instructions

146

Tables Table 1

Characteristics of obstruction lights

Table 2

Transformer general parameters

Table 3

Access control & intruder detection facilities

Table 4

Cable code & standard

Table 5

LV switchboard code & standard

Table 6

UPS technical parameters

120

Table 7

UPS overload capacity

122

Table 8

Colour code

140

Appendices Appendix A Reference Vietnamese Translation

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page vii

SCOPE OF WORK

1.1

Project Description

The Oriental Sea Villas and Hotel Resort is luxury resorts including of luxury villas, Reception building and 250 keys Sheraton hotel. The “Project” will locate at Hoa Hai Ward, Ngu Hanh Son District, Danang City, Vietnam.

1.2

Services Description

The services cover under this specification is for the supply, installation, testing & commissioning and maintenance during defect liability period of Electrical Systems including: Power Substation, Power Distribution, BOH Lighting, Lightning Protection, Earthing, Public Address, Mobile Booster and BMS and others specified on drawings.

1.3

Definition Of Terms

The following definitions apply to the terminology used in this specification and associated drawings.

Owner/Principal:

ORIENTAL SEA VILLAS AND HOTELS CO., LTD

Architect Consultant:

DPA

C&S Engineers:

VNCC

M&E Engineers:

AURECON VIETNAM

Lighting Engineers:

LIGHTBOX, SINGAPORE

Acoustics, AV & IT Engineers: IHD LTD HONG KONG Security Engineers:

STET, SINGAPORE

Fire Life Safety:

SERECA CONSULTING PTE LTD, S’PORE

Local Fire Safety:

VIETSAFE

Spa Design:

ILC LTD, HONG KONG

Kitchen Consultant:

FSCS, SINGAPORE

Pool and Water Feature

AQUAWORKS, SINGAPORE

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page 1

1.4

Extent Of Work

This specification, unless specifically stated otherwise, calls for the provision of systems complete in every respect, fit and ready for continuous, safe, efficient operation. The Sub Contractor shall therefore supply, deliver, install, test, commission and set to work the systems and they shall be complete with all necessary ancillary and minor items, whether expressly indicated on the drawings or specification or not. i) Supply and installation of Power Sub-Station, including MVSG 24kV RMU, Transformer 22(15)kV/0,4kV 50Hz 3P 4W and all relative connections ii) Supply and installation of Main LV Switchboard (MSB) and All Floor Distribution Boards (LDB) as indicated in drawings of Electrical Services iii) Supply and installation of Services Switch Boards (MSSB, FSSB, HSSB, LSSB) where indicated in drawings of Electrical Services iv) Supply and installation of Consumer Mains, Sub-Mains to all Switchboards including Services Switchboards (MSSB, FSSB, HSSB, LSSB) and to isolation switches for Supply / Exhaust Fans and FCU etc. as indicated in MVAC drawings v) Supply and installation of all Light Fittings, Lamps, Cabling, Cable Tray, Trunkings, Conduits, and associated accessories as detailed on the drawings and described herein vi) Supply and installation of Exit and Emergency Light Fittings vii) Supply and installation of all Power Outlets and/or connections to equipment, cabling, cable trays, trunkings, conduits and associated accessories as detailed on the drawings and described herein viii) Supply and installation of Lightning Protection System ix)

Supply and installation of Public Address System (PA)

Co-ordination with the Main Contractor and other Trade Contractors xi) All associated building work unless specifically nominated elsewhere in this specification. The work shall include Over-flashing of all electrical services roof penetrations, making good, fire stopping and painting xii) Testing, commissioning, maintenance and defects liability for the completed work. This shall include:

 

Defects liability for 52 weeks from date of Practical Completion. Maintenance during the defects liability period.

xiii) Provision of 4 sets of Operating and Maintenance Manuals, including as-installed drawings in AutoCAD format and all testing & commissioning data.

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page 2

CO-ORDINATION AND WORK BY MAIN CONTRACTOR

2.1

Co-Ordination

Co-ordinate and furnish all necessary information as required to the Main Contractor and other Contractors so that works can be carried out without undue delay to the construction programme. Any additional work occasioned by lack of co-operation with the Main Contractor or any other Contractors will not be considered as a variation to the Contract or as grounds for extension of time. The Main Contractor will be responsible for checking all Contract penetration drawings and for negotiating with the various Contractor/Contractors for amendment of penetration requirements as necessary.

2.2

Works By Main Contractor

                  

The site to be fenced and space made available for sheds.



Make good to gardens, roads and paths after installation of service

Toilets and temporary water Assistance setting out Keeping site clean, removal of rubbish Excavation and back fill for services between buildings Provision of holes as required for the entrance, installation and access of equipment and conduits Concrete trenches with access pits for cables. Casting-in of holding down bolts to templates provided. Waterproofing of plant room floor. Acoustically separate plant room structure. Ensure cavities are cleaned out. Building in of pipe sleeves. Drilling through concrete slabs or walls. Bund for above-ground oil tanks. Fire rated wall for electrical room Access to roof for maintenance. Fixing of guy anchors. Ventilation louver to Plant rooms. Access panels in demountable ceiling to high maintenance items. Roof penetrations and under flashing (the Main Contractor to provide the under-flashing, Contractor to provide the over-flashing).

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page 3

SPECIFIC PROJECT REQUIREMENTS

3.1

Design Requirements

3.1.1

Electricity Supply

The electricity supply will be 380V/50Hz/3P and 220V/50Hz/1P and Neutral from the Power Substation. All equipment shall be suitable for this supply. 3.1.2

Consumer Mains & Metering

Consumer mains shall be installed from the Power Transformer to the LV-MSB to be located on the electrical room. Meters will be installed for each of the jurisdictions as indicated on the drawings. Arrange with the Supply Authority for metering to be provided as shown and allow all necessary meter panels to their requirements. 3.1.3

Main Switchboard

Supply and install in the position as shown on the drawings, one new main switchboard containing all equipment as shown on the single line diagram and as specified herein. The switchboard shall be of the indoor, metal enclosure, air break type, suitable for operation in the switch-room shown on the drawings. The switchboard shall be capable of withstanding the thermal and magnetic stresses set up by a fault level as shown on the drawings. The switchboard shall be of free standing, top entry, dead front, totally enclosed, unitised, dustproof, back connected with lift off panels and constructed to conform to the requirements of IEC 60439 Form 3B. All outgoing connecting terminals shall be fully sleeved when sub-mains are terminated. 3.1.4

Distribution Boards

Distribution boards shall be as detailed on the drawings. Provide ducting where necessary to conceal sub-circuit cables where they leave the distribution boards. 3.1.5

Underground Cables: Refer Section 6.5.

3.1.6

Sub-mains

Sub-mains shall be as nominated on the drawings. The Sub Contractor, prior to ordering cables, shall examine the architectural and structural details and determine the most appropriate sub-main route. All sub-mains shall be run on cable tray. All sub-main cables shall be spaced on cable tray so as to avoid de-rating in accordance with BS 7671 Appendix 4. 3.1.7

Power Outlets and Isolators

Supply and install power outlets and Isolators as shown on the drawings 3.1.8

Lighting Fittings

BOH Light fittings shall be as nominated and as scheduled and approved by M&E Consultant. Localised on/off controls shall be provided to all areas to enable manual switching of lighting as shown on the drawings Lights shall be supplied strictly in accordance with that specified. Set-out of lights in ceilings shall be performed in accordance with the architectural drawings.

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page 4

3.1.9

Exit and Emergency Lighting System

A system of self-contained EXIT and Emergency Lighting system shall be provided. 3.1.10

Lightning Protection

Supply and install a complete lightning protection system as detailed in later clauses of this specification. Refer to separate section for full description of system

The lightning protection system will be the Early Streamer Emission type to comply with NFC 17-102.

 

Lightning rod will be solid copper ensuring good corrosion resistance.



Resistance of the lightning protection system will be less than 10 ohms in the peak dry season of the year.



Cables connection and earthing rods will be cad welded to ensure permanent connection at welded points in term of electrical and mechanical continuity.



Surge protection devices (SPD) will be installed at the main switchboard and at other points throughout the system where considered prudent to do so – this may include where sensitive electronic devices are housed.

95mm2 bare copper shall be used as down conductor run in uPVC DN32. If the resistance more than 10 ohms, the addition of earthing rods will be required.

Refer to section 5.28 for detail. 3.1.11

Acoustics

Noise generated by electrical services into occupied spaces shall not cause the background noise level to increase by more than 1 dB(A) for typical use. 3.1.12

Electromagnetic Shielding

The whole electrical system shall be designed and installed in a manner that shall minimise electromagnetic field to adjacent work areas. Acceptable magnetic field limit shall be 10mG at working level height. In situations where the magnetic field is more than 10mG, due to the installed electrical system, electromagnetic shielding in the form of ferromagnetic material shield shall be installed to decrease the field to the acceptable level. 3.1.13

Maintenance and Defects Liability

Fully maintain the total installation including all new works within the building for a period of 12 months, starting from date of practical completion as determined by the Project Manager/Consultant. Include for all testing and logging of equipment as required by the relevant British Standards, Codes and Local Building Authorities.

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page 5

3.2

System controls and operation

Description The required minimum measurements to be provided shall be:

   

Consumption (kWh) Voltage (V) Current (A) Peak Demand (kW)

Metering Metering shall be provided at the Incoming supply as well as per indicated on drawings. The Sub Contractor shall be responsible to co-ordinate all metering requirements with Local Power Company. The Sub Contractor shall allow for all metering and signal cabling works by Local Power Company including associated charges.

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page 6

GENERAL REQUIREMENTS

4.1

Site Inspection

Inspect the site to familiarise yourselves with the conditions thereupon prior to submission of tender. Confirmation of site inspection shall be submitted with tender.

4.2

Statutory Requirements And Standards

British Standard & IEC current at the date of tendering and also reference Codes and Standards listed in the prefaces to those Standards and Codes are applicable in respect of all materials and workmanship except where in conflict with the provisions of these specifications. Where British Standard do not exist the appropriate IEC or Local Code shall apply. Where this specification expressly requires standards higher than or different from those applicable under the relevant Standard or Code documents, this Specification shall be followed. Advise all subsequent amendments to applicable codes as they come into force during the work and seek a direction regarding compliance for this project. All work shall comply with the:

          

11TCN 19:2006

Electrical conduction system

11TCN 20:2006

Distribution & Transformer

11TCN 21:2006

Protection & automatic

TCVN 7447-5-51: 2004

Electrical equipment installation – General regulation

TCVN 7447-5-53,54:2005

Electrical equipment installation – Isolator & Control

TCXD 25:1991

Internal installation

TCXD 27:1991

Internal installation for residence & public buildings

TCVN 2622:1995

Fire protection for building

TCVN 6160:1996

Fire protection for high-rise building

BS 67

Specification for ceiling roses.

BS 88

Low voltage fuses. Supplementary requirements for fuses for use by unskilled persons (fuses mainly for household and similar application).



BS 196

Specification for protected-type and non-reversible plugs, socket outlets, cable couplers and appliance couplers with earthing contacts for single-phase a.c. circuits up to 250 volts.

 

BS 476

Fire tests on building materials and structure

BS 546

Specification. Two-pole and earthing pin plugs, socket-outlets and socket-outlet adaptors.



BS 646

Specifications for Cartridge fuse links (rated up to 5 amperes) for a.c. and d.c. service.

 

BS 951

Specification for clamps for earthing and bonding purposes.

BS 1362

Specification for general purpose fuse links for domestic and similar purposes (primarily for use in plugs).

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page 7

  

BS 1363

13A plugs, sockets-outlets, connection units and adaptors.

BS 1710

Specification for identification of pipelines and services.

BS 2754

Memorandum. Construction of electrical equipment for protection against electric shock.



BS 3036

Specification. Semi-enclosed electric fuses (rating up to 100 amperes and 240 volts to earth).

 

BS 4293

Specification for residual current operated circuit-breakers.

BS 4568

Specification for steel conduit and fittings with metric threads of ISO form for electrical installations.

  

BS 4573

Specification for 2-pin reversible plugs and shaver socket-outlets.

BS 4607

Non-metallic conduits and fitting for electrical installations.

BS 4727

Glossary of electrotechnical, power, telecommunications, electronics, lighting and colour terms.

  

BS 50085

Cable trunking systems and cable ducting systems for electrical installations.

BS 5266

Emergency lighting.

BS 5467

Electric cables. Thermosetting insulated, armoured cables for voltages of 600/1000V and 1900/3300V

  

BS 5733

Specification for general requirements for electrical accessories.

BS 5839

Fire detection and alarm systems for buildings

BS 6004

Electric cables, PVC insulated, non-armoured cables for voltages up to and including 450/750V, for electric power, lighting and internal wiring.

   

BS 61386

Conduit systems for cable management.

BS 6207

Mineral insulated cables with a rated voltage not exceeding 750V.

BS 6458

Fire hazard testing for electrotechnical products.

BS 6701

Code of practise for installation of apparatus intended for connection to certain telecommunications systems.



BS 6724

Electric cables. Thermosetting insulated, armoured cables for voltages of 600/1000V and 1900/3300V, having low emission of smoke and corrosive gases when affected by fire.



BS 6972

Specification for general requirements for luminaire supporting couplers for domestic, light industrial and commercial use.

  

BS 7071

Specification for portable residual current devices.

BS 7211

LSF insulated non armoured cables / wires

BS 7288

Specification for socket-outlets incorporating residual current devices (SRCDs).

 

BS 7430

Code of practise for earthing.

BS 7454

Method for calculation of thermally permissible short-circuit currents taking into account non-adiabatic heating affects.

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page 8



BS 7629

Electric cables. Specification for 300/500V fire-resistant electric cables having low emission of smoke and corrosive gases when affected by fire. Multicore cables

  

BS 7697

Nominal voltages for low voltage public electricity supply systems.

BS 7822

Insulation coordination for equipment within low voltage systems.

BS 7846

Electric cables, 600/1000V armoured fire-resistant electric cables having thermosetting insulation and low emission of smoke and corrosive gases when affected by fire.



BS 7889

Electric cables. Thermosetting insulated, non-armoured cables with a voltage of 600/1000V, for fixed installations.

     

BS 7895

Specification for bayonet lampholders with enhanced safety.

BS EN 50081

Electromagnetic compatibility. Generic emission standard.

BS EN 50082

Electromagnetic compatibility. Generic immunity standard.

BS EN 50085

Specification for cable trunking and ducting systems for electrical installations.

BS EN 50281

Electrical apparatus for use in the presence of combustible dust

BS EN 50310

Application of equipotential bonding and earthing in buildings with information technology equipment.



BS EN 50525

Electric cables. Low voltage energy cables of rated voltage up to and including 450/750V (Uo/U) cables for general applications.

    

BS EN 60079-14

Explosive atmosphere. Electrical installation design, selection and erection.

BS EN 62305

Protection against Lightning

BS EN 60269

Low voltage fuses.

BS EN 60309

Plugs, socket oultets and couplers for industrial purposes.

BS EN 60423

Conduits for cable management. Outside diameters of conduits for electrical installations and threads for conduits and fittings.

    

BS EN 60439

Specification for low voltage switchgear and control gear assemblies.

BS EN 60598

Luminaires.

BS EN 60669

Switches for household and similar fixed electrical installations.

BS EN 60947

Specification for low voltage switchgear and control gear.

BS EN 60950

Specification for safety of information technology equipment including electrical business equipment.



BS EN 61008

Residual current operated circuit-breakers without integral overcurrent protection for household and similar uses. (RCCBs)



BS EN 61009

Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses. (RCBOs)

 

BS EN 61386

Conduit systems for cable management. General Requirements

BS EN ISO 1461

Hot dip galvanized coatings on fabricated iron and steel articles. Specifications and test methods.



CIBSE

CIBE Code for Lighting

Project 248779 File 01. 248779-Oriental Sea Villa & Hotel Resort-Elec Spec. (EN) Rev.02.docx 4 August 2016 Revision 02 Page 9

   

CIBSE LG7: 2005

Office Lighting

CIBSE LG12

Emergency Lighting Design Guidelines

CIBSE TM12:1986

Emergency Lighting

IEC 60227

Polyvinyl chloride insulated cables of rated voltages up to and including 450/750V.

     

IEC 60228

Conductors of insulated cables

IEC 60287

Electric cables. Calculation of current rating.

IEC 60331

Tests for electric cables under fire conditions – Circuit Integrity.

IEC 60332

Tests on electric and optical fibre cables under fire conditions.

IEC 60529

Classification of Degree of Protection provided by Enclosures.

NFPA72

National Fire Alarm and Signalling Code

4.3

Warranties

Warranties specified in this specification are additional to any warranties required by current Industry Codes of Practice and relevant regulations

4.4

Specification And Drawings

The drawings provided with this Specification shall be read in conjunction with this Specification. The Specification and drawings are mutually explanatory, and all work called for by one, even if not by the other, shall be fully executed and completed. The drawings shall be considered approximate and diagrammatic only. Actual dimensions shall be obtained by The Sub Contractor. Accept the responsibility to ascertain that all particular equipment offered fits into the provided spaces taking into consideration the requirements for maintenance and other factors affecting the installation.

4.5

Discrepancies & Omissions

If any discrepancy, contradiction or omission appears in the specification or drawings, refer same to the Project Manager and Consultant for resolution before submitting a Tender. The Consultant will issue directives on such matters in writing. Oral amendments to the specification shall not be recognised.

4.6

Setting Out Openings And Making Good

The precise location of all openings, fixings and similar items of work required for these works to be provided by the Main Contractor shall be determined at such times as not to cause delay to the work. All items shall be checked to ensure correct positioning. If openings, fixings and similar items of work are wrongly located or are omitted due to incorrect or lack of information, bear the responsibility of the cost of any remedial works. The specification drawings are diagrammatic only and unless otherwise stated shall not be used for determining the precise positions of equipment outlets and like features. The exact location of these shall be determined on site or from shop drawings. All chases, ducts, recesses and penetrations in structural elements not shown on the building and structural drawings shall be subject to approval.

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4.7

Positioning Of Outlets And Equipment

The layout of equipment shown on the drawings is diagrammatic only, and exact positions shall be determined on site. Final position shall be to the approval of the Architect/Consultant. Ensure that all plant offered in suitable for installation in the location and spaces shown on the drawings and will be accessible for maintenance in accordance with the manufacturer’s recommendations when installed. Outlets shall be spaced accurately and symmetrically within rooms. Positions of all outlets, switches and fittings shall be chalked up in areas where the outlets are adjacent to tiles or other architectural dados. Approval of the Consultant shall be obtained before placing any final conduits or wiring for these outlets. The position of outlets and switches shown on the drawings is assumed to be correct, however, variations of up to 2m may be effected without cost variation if the change is advised before the outlet or switch is fitted off. Where outlets are in close proximity they shall be aligned horizontally and/or vertically as the case may be. Equipment shall be symmetrically located in relation to other equipment and devices, the building module and general aesthetic treatment.

4.8

Co-Ordination of Installation

Co-ordination shall be carried out to ensure that all items for installation in false ceilings are provided in sufficient time to comply with the Main Contractor’s program. All other services within false ceilings shall be completely installed so that it will not be necessary to remove any ceiling tiles to finish other work, apart from commissioning. Responsibility and provision shall be allowed for any cost where due to delays or deficiencies attributable to this Contract, ceiling tiles must be removed and replaced, or additional penetrations provided in the ceiling.

4.9

Performance and Guarantee

By the fact of this tendering, guarantee: a) The equipment offered is of the most modern and correct design and construction and of the necessary capacity to efficiently perform the work specified. b) The equipment offered is capable of being installed in the plant space shown on the exhibited drawing with adequate clearance for its proper operation and maintenance. c) The equipment offered will provide the minimum capacities as scheduled elsewhere in this Specification or on the drawings. d) All the settings and limits of all control instruments and equipment shall be the responsibility of The Sub Contractor and he shall ensure that the specified requirements and conditions are met.

4.10

Shop Drawings

Prepare Shop Drawings of the proposed installation. All Shop Drawings shall be submitted to the Principal/Consultant for approval before commencing any work. All checking and approval of such drawings by the Principal/Consultant shall be construed as gratuitous assistance and does not relieve responsibility for errors or omissions from The Sub Contractor. All submitted shop-drawings shall be in 1/50 scale minimum Where such errors or omissions are discovered later they shall be corrected irrespective of any approval given by the Principal/Consultant. Approval of drawings shall not be construed as authorising

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additional work or increased cost to the principal. In the event that the drawings indicate additional work involving increased cost. Notify the Principal/Consultant at the time of submission of the drawings.

4.11

As - Installed Drawings

As from the commencement of work, employ a competent draughtsman to keep a record of all deviations and changes from the contract and workshop drawings and shall mark on a set of prints an accurate record of all work as actually installed. During the progress of the work record on AutoCAD (latest version) files, as specified, the installations as actually built, and submit these to the Consultant for checking. Upon approval by the Consultant of these drawings provide sets of prints as specified elsewhere. In addition provide sets of correctly recorded diagrams, schedules of equipment, control panels and circuits, cable tray and conduit runs and all information regarding the installations as actually built. In addition retain one copy of each of the "as installed" drawings and schedules for use during the Defects Liability Period.

4.12

Equipment Deviations

The dimensions and ratings of equipment specified herein or indicated on the drawings are intended to establish the outlines and characteristics of equipment furnished by the particular manufacturers specified. Should an alternative be offered or intention to use an item of equipment other than that specified or shown on the drawings or in the Schedule of Technical Data (Appendix B) in the Contract, apply in writing to the Principal/Consultant and await written approval before proceeding. Where such approved deviation requires a different quantity and arrangement of architectural or structural materials, or a different quantity and arrangement of wiring, conduit and equipment from that specified or shown on the drawings, furnish and install any such additional structural supports, insulation, controllers, motors, starters, electrical wiring and conduit, and any other additional materials and equipment necessitated by the deviation.

4.13

Packaged Equipment

Where packaged or unitary equipment is specified or offered against this Specification, such equipment shall be modified to conform to the requirements of this Specification, whether or not this requires modification of the Manufacturer's standard construction. The fact that a particular packaged item by name have been offered shall not absolve the requirement of modifications to meet the Specification.

4.14

Samples And Prototypes

Samples of materials and items described as "to be approved" shall be delivered to site at least 15 days before approval is required. Two samples shall be supplied of each item required, each one to be properly identified and marked with the suppliers name and model number. One of the samples shall be held on site, the second shall be returned to The Sub Contractor/Manufacturer once it has been viewed and comments have been received from the Consultant. On acceptance the samples will be marked with date approved and by whom. Submit the following sample fittings and accessories to obtain approval of the Consultant before installation:

 

Light Fittings Power Outlets, Switches

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

Conduits, Cables, Cable Trays, Trunkings.

Arrange for the Consultant to inspect the samples to obtain approval and acceptance in writing of the offered samples. The approved samples shall be retained on site for reference purposes until completion of the work. All such materials used in the work covered by this specification shall conform to the approved samples. The Consultant will be at liberty at any time to test or analyse samples of any materials brought onto the site and intended for these Works. In addition to the above requirements for the production, submission and approval of samples and prototypes, the Main Contractor may prepare an area in advance of the general construction cycle. The purpose of this area shall be to ensure co-ordination of all services and finishes and as a display area. Provide and install all samples and prototypes required for such an area as directed by the Main Contractor.

4.15

Radio Interference

All equipment and/or appliances provided under this specification shall be designed so that no interference will be caused with any radio or other electronic transmitting or receiving equipment in the same locality. In the event of the inherent characteristics of the electrical installation being such that interference is possible, efficient devices or screening techniques capable of eliminating such interference shall be provided at no additional costs. Define the areas susceptible to interference prior to the purchase of equipment and appliances and advise the Consultant of the methods to be adopted to reduce the interference.

4.16

Labelling

All switches, fuses, relays, terminal strips, circuit breakers and compartments shall be comprehensively labelled to clearly indicate their function. Labels shall be of Sandwich Ivorine or Traffolyte material, white with black lettering for normal power and white with red lettering for standby power. Circuit breaker labels shall include base rating and protection setting. Submit all label schedules for approval prior to manufacture. The labels on switchgear protecting outgoing circuits and sub-mains greater than 6 sq.mm per phase shall include the cable size, number of cores and cable type. Labels for fuse combination units shall include both fuse rating and frame rating. Each power outlet shall be engraved or fitted with a means of identification, indicating the circuit protective device and the distribution board to which the switch or outlet is connected. In the case of metal-clad power outlets, or equipment isolators, this means of identification shall be 5mm uppercase engraving red filled or an ivorine label, screwed to the metal casing of the switch or outlet, the label to be 10mm wide with 5mm lettering (white) on a black background. For outlets and equipment other than metal-clad, engraving shall be 3mm uppercase red filled or circular tag labels equal to those referred to as "IPA studs". Where consumer main and sub main cables enter and leave trays, racks, troughs or ducts along their route length and at each end they shall be labelled according to the cable schedule, or as directed with stamped aluminium or brass tags attached with nylon straps or other approved means. Such straps shall be used to tie together single core cables of the one circuit.

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Where extra low voltage dichroic lamp luminaires are used within the installation a label shall be attached to each switchboard stating the following, "Warning: Ceiling mounted recessed extra low voltage lighting fittings are installed in these premises. In order to avoid the risk of overheating they MUST NOT be covered by thermal insulation".

4.17

Workmanship And Materials

Provide skilled and expert labour as necessary to carry out the work in the best possible manner. The quality of workmanship shall be of first grade and in accordance with the highest standards of the respective trades. Workmanship of poor quality or of an unacceptable standard will be rejected by the Consultant and must be replaced at no extra cost to the Owner/Principal with workmanship of the required standard. All materials, fittings, accessories and apparatus are to be of first grade design and manufacture and are to comply with the relevant British and/or Australian standard specification. All materials, fittings, accessories and apparatus shall be new and shall be of current model and design unless specified otherwise. Submit for the approval of the Consultant prior to commencing installation, a list of all accessories, fittings and apparatus which it is proposed to employ in the work, and only such items as have been approved may be installed. Failure to comply with this provision will result in the unconditional rejection of such items when inspected on site. Where directed by the Consultants "approved" samples shall be kept on site. Each item of equipment shall be a standard catalogue product of an established, reputable, approved manufacturer. All similar equipment shall be of the same manufacture, type, class and finish, unless otherwise specified. Where manufacturer’s catalogue numbers or types are specified or shown on the drawings, they are generally intended to be used as a guide, and are not intended to take precedence over the basic duty and performance specified or shown. In all cases, verify the duty with the particular characteristics of the equipment offered for approval. Where no alternative materials are noted in the specification or on the drawings and where the words "equal", "approved equal", "as approved" etc do not appear, the exact make specified must be furnished and installed. No alterations will be permitted in the lists of manufacturers and suppliers submitted within Tender or subsequently without the written approval of the Consultant. Should materials and/or equipment other than by the approved manufacturer or supplier, be installed, such items may be rejected on site. All such rejected items shall be removed from the site as soon as possible and be replaced by approved items at no cost to the Principal. The replacement of any such items shall not constitute grounds for any variation or any extension of time. Take every care to avoid damage to fittings, surfaces and equipment in the premises. Any damage caused shall be made good at no additional cost.

4.18

Power Factor, Balancing & Voltage Drop

Ensure and be responsible for the final installation having:

   

An overall power factor within acceptable limits Been balanced over the three phases and A voltage drop within acceptable limits All of the above to the satisfaction of the Local Power Company.

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4.19

Earthing

Earthing of the complete electrical installation shall be strictly in accordance with the requirements of the IEE Wiring Rules (BS 7671 2008 incorporating Amendment No 1 & 2), and the special requirements of the specification and the Local Power Company. Earth conductors, excepting earth conductors in insulated and sheathed cables, shall be of annealed stranded copper of a size not less than 1.5mm2 and shall be insulated and enclosed in conduit with the respective circuit wiring. Earth conductors in insulated and sheathed cables shall be a minimum of 1.5mm2. The whole of the system shall be mechanically and electrically continuous throughout. All general purpose power outlets and light fittings shall be earthed.

4.20

Colour Coding

The correct phase colour for each active conductor shall be extended throughout all circuits.

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ASSOCIATED WORK AND TERMINATION POINTS

The following work associated with the electrical services is to be executed by the Electrical Services Contractor unless otherwise stated.

5.1

Associated Work

Carry out all civil, structural and building work required for access, construction, installation, operation and maintenance of the installation covered by this Specification, with the exception of the items specified as Carried out by others, the Contractor or the Client on the accompanying drawings and noted in the specification. The strength and rigidity of all the structures and fastenings throughout the installation shall be designed to prevent failure, significant movement or deflection in accordance with appropriate British Standards. The calculations shall allow for all operating loads, both live and dead, including those associated with maintenance and associated traffic that would be experienced during the life of the installation. Seal all penetrations, coordinate the formation of all necessary chases, openings, recesses and making good, in compliance with local Fire Life & Safety Code. The Electrical Contractor shall be responsible for all other minor incidental work required for the completion of their work. The Electrical Contractor shall be fully responsible for detailing the exact requirements in respect of this work and do so in good time to ensure that it can be co-ordinated, planned and carried out in accordance with the building program without causing re-work of work already performed or cause other unnecessary costs.

5.2

Building Work

To be undertaken by the electrical contractor. GENERAL: Sealing of penetrations through walls, floors and ceilings as described herein. AIR TIGHT SEALS: Penetrations for trays, duct-work, piping, cabling etc through the structures subject to suction or pressurisation shall be sealed. FIRE SEALS: Penetrations through fire rated wall shall be fire sealed. ACOUSTIC TREATMENT: Acoustic requirements to all electrical switchrooms and plantrooms. PENETRATIONS: Penetrations, holes, chases in floors, walls, ceilings and roofs.

5.3

Schedule of Termination Points

Provision of electrical circuit, cabling and isolator or outlet as coordinated with the other trades as outlined below: 5.3.1

General



Provide socket outlets and/or isolators and/or direct connections for equipment as detailed on the drawings. Coordinate final location and rating of equipment with equipment supplier. Ensure circuit breaker, cable rating and accessories are suitable for equipment supplied.



Coordinate all equipment locations with all building and other services contractors.

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5.3.2

Hydraulic Services Contractor



Provide socket outlets and/or isolators for equipment as detailed on the drawings. Coordinate final location, ratings and all details with the hydraulic services contractor. Ensure circuit breaker, cable rating and accessories are suitable for equipment supplied.



Provide sub-main cabling to all Hydraulic Control Panels. Coordinate final location, ratings and all details with the hydraulic services contractor. Leave 3m cable coil for connection by the Hydraulics / Plumbing Contractor. Ensure sub-main protection and sub-main cable ratings are suitable for equipment supplied.

5.3.3



Fire Services Contractor

Provide socket outlets and/or isolators for equipment as detailed on the drawings. Coordinate final location, ratings and all details with the fire services contractor. Ensure circuit breaker, cable rating and accessories are suitable for equipment supplied.

5.3.4

Mechanical Services Contractor



Provide sub-main cabling to all Mechanical Control Centres (MCC). Coordinate final location, ratings and all details with the mechanical contractor. Leave 3m cable coil for connection by the Mechanical Contractor. Ensure sub-main protection and sub-main cable ratings are suitable for equipment supplied.



Provide generator control wiring to all Mechanical Control Centres (MCC). Provide terminal strip within the MCC. Coordinate all details with the mechanical contractor.

 

Provide metering system interface to the BMS to enable all meters to be read and by the BMS. Coordination with the mechanical services contractor for interfacing between the electrical systems and the mechanical controls and BMS including generator and metering.

5.4

Electricity Supply

The Electrical contractor shall undertake all medium voltage cabling throughout the plots and provide medium voltage cable to the Medium Voltage Switchroom. Provide suitable cable access ways from the site boundary to the Medium Voltage Switchroom for cabling by the Electrical contractor. Undertake all lugging and connect the medium voltage cabling onto the Medium Voltage Switchboard. Coordinate all details with EVN to ensure all cabling details and locations are confirmed prior to construction. Obtain all required EVN approvals of all incoming supply details prior to construction.

5.5

Medium Voltage Switchboard

Provide a new Medium Voltage Switchboard as shown on the drawings including incoming isolating switch, feeder circuit breakers and outgoing isolating switch. Provide with suitable overcurrent and earth fault protection. Provide Medium Voltage Switchboard as standard EVN approved equipment. Provide and install MV Switchgear in accordance with the following document:

 

EVN Standard Technical Specifications for MV Electric Works MV Switchgear (Specification) 11kV, 22kV or 33kV SF6 Gas-Insulated Switchgear

Provide the completed data sheet.

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Locate the MV Switchboard within the Medium Voltage Switchroom in suitable location for maintenance of the unit and for the future extension. Coordinate with structural steel supports for the equipment and ensure structural steel supports in correct location. Provide suitable structural support frame for the medium voltage switchboard. Provide metal grid mesh flooring to the medium voltage switch gear room (where applicable). Provide all equipment and undertake works in accordance with EVN requirements and obtain approval of the installation from EVN.

5.6

Medium voltage feeder cabling

Provide and install Medium Voltage Feeder Cabling as shown on the drawings from the medium voltage switchboard to the transformer. Reticulate the cabling within cable trench or cable ladder. Fire seal all penetrations between the medium voltage switchgear room and the transformer room. Provide all equipment and undertake works in accordance with EVN requirements and obtain approval of the installation from EVN.

5.7

Transformer

Provide and install transformers in accordance with the following document:

 

EVN Standard Technical Specifications for Electric Works Transformers / Reactors / Resistors (Specification) Auxiliary / Distribution Transformers (Epoxy-Resin Dry Type, Indoor Installation)

Provide the completed data sheet titled:

 

Transformers / Reactors / Resistors



Step-up Transformer (Epoxy-Resin Dry-Type, Indoor Installation) 560kVA, 2500kVA

Auxiliary/Distribution Transformers (Epoxy-Resin Dry-Type, Indoor Installation) 2x1250kVA, 2000kVA 22/0.4 kV

Provide transformers in full compliance with the above documents and to EVN approval. The following general parameters are applicable: Table 1

Transformer general parameters

General Kind of Installation Applicable Standards

Indoor IEC

60076, 60726

Type of core

Core type

Number of windings

Two

Ratings Rated power

kVA

630, 1600, 2000

Maximum ambient temperature

Degree C

Maximum service altitude

1000

Temperature rise limit of windings

Thermal class of windings

Class F

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Fire behaviour class of transformer

Class F1

Rated primary voltage

Rated secondary voltage at no-load on principle tap

0.400

Number of phases

Permissible load of neutral point

Vector group symbol

100 Dyn11

Rated frequency

Impedance voltage (75 deg C) at full rated power

Magnetic flux density at rated voltage and frequency

Tesla

1.72

Maximum permitted load losses at 75 deg C, rated voltage, frequency, full site rated load and main tap

Max. 9.0

Maximum permitted no-load losses at 75 deg C, rated voltage, frequency, full site rated load and main tap

Max. 2.3

Tapping Range

+/- %

2 x 2.5

Number of steps

+/- No.

Tapped winding

Principal tapping at

Power frequency withstand voltage (winding)

Lightning impulse level (winding)

125

Power frequency withstand voltage (bushing)

Lightning impulse level (bushing)

170

Min. 21

Insulation Level Primary

Secondary Power frequency withstand voltage Protective Housing Protection class Housing prod proof

Yes

Tests Routine tests according to IEC 60076 and specifications

On each unit

Separate source AC voltage withstand test

On each unit

Test voltage / primary

Test voltage / secondary

Induced AC voltage withstand test

On each unit

Test voltage / primary

Test voltage / secondary

0.83

Test duration

Operating Details Cooling method

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Constant power at all taps

Yes

Noise level (LpA) at measuring distance of 1.0m

dB (A)

Max 56

Auxiliary supply voltage

Vac

400/230

Locate the Transformers within the Transformer room in suitable location for maintenance of the each transformer with 15000mm clear access to the medium voltage switchgear room. Coordinate with structural steel supports for the equipment and ensure structural steel supports in correct location. Provide suitable structural support frame for the transformer. Provide metal grid mesh flooring to the transformer room. Provide all equipment and undertake works in accordance with EVN requirements and obtain approval of the installation from EVN.

5.8

Compact Substation

The Medium Voltage Ring Main Unit shall be indoor type unit designed with the minimum acceptable degree of ingress protection (IP) for electrical equipment and devices as IP 54, The unit shall be integrated assembly, self-contained, totally insulated and shall comprise:



Stainless steel, gas-tight metal enclosure, sealed for life, which groups together the live parts and three (3) functional units

  

Three cable compartments with interfaces for connection to the network and distribution transformer Low Voltage compartment Operating mechanism compartment

The performance characteristics obtained by the Ring Main Unit shall meet the definition of a "sealed pressure system" in compliance with latest IEC recommendations The enclosure shall be filled with SF6 gas at a 0.2 bar gauge pressure. It shall be sealed “for life” after filling. Its tightness, which shall be systematically tested at the factory, shall give the switchgear an expected lifetime of 30 years. No maintenance of live parts shall be necessary.

5.9

LV Mains Cabling

Provide LV Mains Cabling from the transformer to the Main Distribution Board located on cable ladders within the transformer and LV Main Switchboard room as shown on the Detailed Design drawings. Reticulate sub-mains on cable ladder in arrangement to avoid de-rating and to separate cabling suitably. Provide cabling of size and type as denoted on the main single line diagram drawing. Provide suitable space and bus bar connections within the incoming cable way within the Site Main Switchboard for reticulation of the LV Mains Cabling. Fire seal all penetrations between the transformer room and the site main switchboard room. Provide all equipment and undertake works in accordance with EVN requirements and obtain approval of the installation from EVN.

5.10

Generator

Provide and install generator as specified in drawings. Provide 2x1800kVA diesel generators for hotel zone and 1x500kVA diesel generator for villa. All generators are ”stand-by” type

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5.10.1

General

Provide an emergency standby power diesel generator set to operate life safety and other nominated equipment in the event of mains power failure. Provide a generator set as a low voltage 400V, high speed 1500rpm, and standby rated set. Provide a generator set with performance class G2 as per BS ISO 8528-1, wherein at situation when load changes occur, there may be temporary but acceptable deviations of voltage and frequency 5.10.2

Method of Operation

The generator set will not be operated in parallel with the mains. Connect the generator to the system by break-before-make 4-pole automatic transfer switches and provide all necessary control panels and cabling to enable the system to operate as follows:



Mains power failure detected by phase failure relays (PFR) at mains supply side of each automatic transfer switch (ATS).



Loss of power to affected systems – battery and UPS backed systems continue to operate – all other systems shut down.



After short time delay which is set on the ATS (say 5 second to allow for upstream HV fault clearance) the ATS sends a signal-to-start the generator.

 

Generator starts and runs up to frequency and voltage – typically 20 to 30 seconds

   

ATS sense frequency and voltage within limits on the generator supply side

 

Life safety loads regain power as required

  

Generator operates selected systems during mains power failure



ATS closes mains circuit breaker (within 1 second of opening generator circuit breaker) – standing load loses power for short time – HVAC plant programmed to ride-through short break or operate a mains re-start



BMS and MCC’s signalled system back to mains power and sends control signal to all systems to restart.



Generator operates a rundown period as per the manufacturer’s recommendations (typically 3-5 minutes).



The acoustic level for generator within range 90 decibels (dB) for 1 to 7 m and 70 decibels (dB) for 7m and more.

Signal provided to BMS, MCC’s., FIP (Fire Indicator Panel) to initiate required control sequence at generator start-up. This is to control mechanical systems and advise they are in generator mode.

ATS opens mains circuit breaker ATS closes generator circuit breaker Standing load immediately accepted on generator – lighting and fixed power to be within step load of generator to prevent stalling

BMS and MCC’s go to generator mode and sequentially re-start required mechanical plant as required by the controls.

Mains power recovery sensed by PFR at mains incomer to ATS After a time delay to ensure security of supply the generator circuit breaker is opened (say 2 minutes) – within load rejection capacity of generator to prevent over speed and shutting down

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Provide a generator test connection point on the external wall of the generator room to for a portable resistive load bank connection to the generator. Provide shunt trip circuit breaker supply to the load bank testing unit to ensure that in the event of mains power fail during load bank testing the load bank circuit breaker gets shunt tripped and the control procedure above follows. Provide and install control wiring to the BMS to enable all alarm, generator run and status signals to be incorporated into the BMS. Provide a generator control indicator panel on the wall within the building management room to indicate ”Mains Supply”, “Generator Run”, “Generator Online”, “Generator Alarm” and “Generator Fault” indication lights.

5.11

Synchronizing Control Panel

Provide Synchronizing Generator Control Panel (Sync-GCP) within the Main Electrical Rooms located in location as shown on the design drawings. The main facilities of Sync-GCP are indicated on the schematic design drawings and include the following.

   

Main Switches



Pilot lamps (R, W and B) to indicate when switchboard is live

Sub-main protection including ACB, MCCB. Main Bus Power analysers to measure kW, kVA, kWhr, Amps, Volts, pf, Hz and connected back to the BMS system

Sync-GCP’s shall be provided by an approved manufacturer and shall comply with BS EN 60439-1.

5.12

Main Distribution Board

Provide main distribution board (MSB) within the Main Electrical Rooms located in the Basements & MEP technical levels as shown on the design drawings. The MSB main facilities are indicated on the schematic design drawings and include the following.

    

Main Switches

 

Pilot lamps (R, W and B) to indicate when switchboard is live

Sub-main protection including ACB, MCCB. Main Bus Supply authority metering Power analysers to measure kW, kVA, kWhr, Amps, Volts, pf, Hz and connected back to the BMS system

Earthing System

MSB’s shall be provided by an approved manufacturer and shall comply with EVN regulations and BS EN 60439-1. Obtain approval of the shop drawing from the Electrical Engineer prior to manufacture of the switchboard. Provide all equipment and undertake works in accordance with EVN requirements and obtain approval of the installation from EVN

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5.13

Metering Facilities

Provide metering facilities as shown on the drawings and described below:

    

Provide EVN LV metering equipment for the Villa Distribution Boards. Provide EVN MV metering cubicle for Medium Voltage Switchboard Provide EVN LV metering equipment for the Villa Distribution Boards. Provide LV metering panel equipment for each tenant services. Provide separate power analyser check meters to each switchboard and distribution board linked back to the BMS with the following capability:  Provide hourly, daily, weekly, monthly and annual energy consumption for each end use  Compare consumption to previous days, weeks, months and years for trend analysis  Determine ‘out-of-range’ values and alert building operators to unusually high consumption; and  Record peak energy consumption for each end-use.

Provide all equipment and undertake works in accordance with EVN requirements and obtain approval of the installation from EVN. Metering facility for energy metering will be provided to monitor energy usage.

5.14

Surge Suppression Equipment

Provide surge suppression equipment as shown on the single line diagrams including the following:

   

Surge Diverter on Site Main Switchboard Surge Filters on Communications cabinet circuits Surge Filters on Security System circuits Surge Filters on BMS circuits.

5.15

Submains Distribution

Provide sub-mains to service the following as generally indicated on the design schematics.

       

Retail unit Sub-mains To all final distribution boards Mechanical Control Panels Lifts control panel Hydraulic Control Panels and Equipment Fire Control Panels and Equipment Fire indicator panel. Miscellaneous items as shown on the design schematic.

Provide sub-mains complete with the supports systems. Sub-mains to be provided with suitable space to manufacturers requirements and to avoid de-rating. Sub-main sizes and cable routes shown are indicative only. Co-ordinate and confirm final loads, spare capacity required and final cable routes with other trades before installing sub-main supports and cables. Cables sizes shall cater for:

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  

Full current rating or sealed trip settings of the upstream protection devices.



Short circuit fault withstand capacity.

The installation method and separation from adjacent heat-emitting services or insulation materials. Worst case voltage drops to a maximum of 1.75% from main switchboard main buses, at ultimate ratings to final distribution board in the system.

Sub-main cabling shall reticulate on cable tray or within conduit for their entire length.

5.16

Distribution Boards

Provide distribution boards as shown on the Power Schematic Diagram. Distribution boards shall be generally mounted in electrical rooms, free standing on external concrete plinths or exposed in rooms. Distribution boards within electrical cupboards do not require doors over. Distribution board construction shall be fully enclosed metal construction, with stainless steel cover and manufactured in accordance with EVN Regulations with ratings and internal segregations as shown on the drawings. Provide sub-circuit protection, controls and accessories as required including main switch, metering, emergency/exit lighting test switch, pilot lamp, sub-circuit protection, surge protection, lighting control and other devices as shown on the drawings. Each distribution board shall have miniature circuit breakers (MCB’s) and residual current devices (RCD’s) as required, with 15% spare capacity for future use. Provide typed load distribution schedule securely fixed inside the door of the distribution boards indicating all circuits. Provide suitably fixed permanent circuit identification to all outlets to match the distribution board legend. Obtain approval of shop drawing from Electrical Engineer prior to manufacture of the distribution board.

5.17

Uninterruptible Power Supply

Provide a distributed Uninterruptible Power Supply system, as specified herein and shown on the drawings to serve the Fire Alarm & Public Address System, BMS System. Provide static uninterruptible power supply with batteries to maintain full load power continuity for as indication in drawing Provide the new UPS with the following parameters:

     

UPS module shall be a Static type 400V, 3 phase, 4 wire, 50Hz Battery system with minimum duration of backup at full load as per service Battery system with minimum 10 year warranty Total Harmonic Distortion Unit All components to be installed within UPS Modules

The UPS shall be installed within the main switchboard room, Fire control & BMS room as indicated on drawings. Provide full submittal for review prior to construction.

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5.18

Power Factor Correction Unit

Provide Power Factor Correction Units for Main Distribution Board Bus Sections as indicated on the drawings to correct the building power factor to the Local Supply Authority requirements or 0.95, whichever the greater. Provide low voltage 400V power factor correction at each low voltage main switchboard. Power Factor Correction Units to be located within the main switchboard room and housed in separate enclosures. The power factor correction will be multistage and correct to 0.95 lagging. The power factor correction will be connected to the low voltage main switchboards such that they are off-line with the generator set running. Provide full submittal including calculations for approval prior to construction.

5.19

Harmonics and Voltage Disturbances

Provide equipment such as uninterruptible power supplies, variable speed drives and switched power mode supply units that limit the total harmonic current distortion THDU to 2.5% to within the requirements of the EVN by means of equipment design and/or filters. Ensure voltage regulation is within 5% as required by EVN. Balance all electrical loads across the phases to within 5%.

5.20

General Lighting System

The Back of House (BOH) lighting systems required are generally indicated on the lighting design drawings and shall comply with the CIBSE & TCVN standards. The lighting systems shall comprise:

    

Surface mounted batten LED lighting systems Weather-protected surface mounted batten LED lighting systems Corrosion resistant surface mounted batten LED lighting systems Recessed LED lighting systems. Recessed decorative LED downlights

Coordinate all lighting locations with other services prior to construction. Provide all fixing and accessories necessary for completion of the lighting systems. Ensure all interior and exterior lighting is designed in accordance with Starwood Guideline & TCVN standards requirements.

5.21

General lighting control systems

The lighting control systems required for the general lighting installation are indicated on the lighting design drawings and shall comprise:

     

Local light switching including two-way switching Timed delay switching Motion detector switching Time-clock control Dimmer (Dimming panel) Temperature

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Coordinate all lighting control requirements with luminaire suppliers to ensure all systems are compatible. The light control strategy at different area will be identified with light fitting schedule and light layout drawings.

5.22

Emergency Lighting System

Provide emergency evacuation lighting and exit signs complying with FM/UL approval, British Standards, NFPA and TCVN Fire and Life Safety Code in the car parking, fire exit passageways and stairs, common areas, entry foyers, lift lobbies, plant rooms, switchboard rooms and all egress paths as shown on the drawings. Provide emergency lights as follows:



High performance, extra wide spacing emergency lights. Mounting type shall be according to the approved design drawings.



Emergency lights distribution in such a way to have a minimum average lighting level of 10.8 lux along the escape and a minimum of 1 lux measured long the path of egress at floor level as per NFPA 101. A maximum to minimum uniformity ratio of 40:1 shall not be exceeded.

Provide exit lights as follows:

   

Maintained EXIT lights with required viewing distance Exit lights shall be LED. Provide above all EXIT doors and in locations shown on drawings Inside a stair where it leads to the point of exit of the premises

Obtain approval of the shop drawing from Fire Police and the Electrical Engineer prior to installation of the system. Provide all equipment and undertake works in accordance with TCVN & QCVN requirements.

5.23

General Purpose Power

Provide general purpose power outlets (GPO’s) as described below:

   

13 amp GPO’s. 13 amp DGPO’s. Equipment connection isolating switches Direct wired equipment connections

All socket outlets to be in accordance with BS1363, BS 546 and approved by the Engineer. Socket outlets shall also be IP rated suitable for open plant room installation.

5.24

Lighting and General Purpose Power Wiring



Final circuits to lighting and power outlets from distribution boards, generally installed in securely fixed conduit in accordance with BS 7671.



Final circuits to lighting and power outlets wall mounted generally reticulated within conduits within wall cavity to outlet locations.



All luminaires must be connected to final circuits using a ceiling rose or other purpose made connection point and not directly to such circuits.

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

All exposed wiring within plantroom areas to be run in surface mounted galvanized trunking or conduit reticulated square to all building features

5.25

   

Cable Ladders, Trays and Conduits

Cable Ladder for sub-main cables from Transformer to MSB within the service trenches. Cable tray for sub-main cabling within plant rooms. Conduit for sub-main cables, and in plant areas. Conduits to enclose external wiring, surface run wiring, and final sub-circuit wiring.

5.26

Mobile Phone Coverage

The Contractor will be responsible for liaising with Services Provider to ascertain requirements to extend GSM mobile phone coverage to all areas of the project including the lifts and plantrooms.

5.27

Earthing

Provide and install earthing system to the building in accordance with TCVN & EVN Regulations, BS7671, BS7430 and as shown on the Earthing Schematic drawing and Lightning Protection drawings. 5.27.1

Power System Earth.



High voltage earthing system in accordance with BS7671 for combined earthing systems. (under infrastructure scope)



Transformer earthing in accordance with BS7671 and EVN Regulations as TN-S and TT earthing system.

 

Distribution Company to Main Earth Terminal Connection.

  

Earthing conductors.



Bonding of all metal enclosures containing electrical services, sheathing of metal cables, cable trays, conduits and similar to the earthing system.

   

Customer main earth with earth resistance of not more than 1 ohms.

Low voltage earthing system in accordance with BS7671 and EVN Regulations as TN-S and TT earthing system.

Earth electrodes. Bonding of metallic water mains, fire mains and gas mains to Equipotential Earth Bar in main switch room.

Separate neutral and earth throughout the building. Lightning protection system to be separate from electrical earthing system. Separate earthing system for communications system

5.27.2

Communications Earth



A separate communications earth in the Main Telecom Room. The room must be provided with a good earth set with resistance of less than 1 ohm.



Earth conductors connecting communications earth from each communications cupboard to the main earth in the Communications Room.

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5.27.3

 

Lightning Earth

A separate lightning protection earth system to achieve 10 ohms. 95mm2 bare copper shall be used as down conductor run in uPVC DN32. If the resistance more than 10 ohms, the addition of earthing rods will be required

5.28

Lightning Protection System

Supply and install a complete lightning protection system as detailed in later clauses of this specification. Refer to separate section for full description of system

Provide and install lightning protection system to protect the building in accordance with NFC 17-102 and as shown on the Lightning Protection System Detail drawings. Provide a Early Streamer Emission system arrangement as follows:



A lightning rod will be used with robust design and ensuring reliability in the most severe climatic environment.

  

The façade will be bonded to the structure at regular intervals. A bare copper shall be used as down conductor run in uPVC DN32 to earth pit Additional Copper clad earth rods within inspection housings will be used as additional earth electrodes if the resistance to earth required is not achieved.

5.29

Submissions

Submit the following for approval:

     

Technical and pricing schedules.

        

MV Cabling

Assembly, installation and shop drawings. Samples and prototypes. Comprehensive testing, commissioning and balancing of each system. Operation and maintenance manuals and as-built drawings in both hard and soft copies. Submittals, shop drawings and detailed drawings shall be provided for all systems including the following: MV Switchboard

Transformers LV Cabling Generator System LV Switchboards Earthing Lightning Protection LV Distribution Boards Cable ladder and tray

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        

Conduit UPS Surge Protection Equipment Power Factor Correction Equipment Luminaires & Lighting System Layout Power Outlets & Power System Layout Public Address System Fire Alarm System BMS System

Obtain all authority approvals prior to construction.

5.30

Testing and Commissioning

The contractor shall provide testing and commissioning for all electrical systems as defined in this specification. Extensive testing and commissioning procedures are required including all of the following:

           

Full load tests on all generators using dummy loads – make provision Live load test on each substation and on generator running in synchronism – make provision UPS load/discharge test on live load for each UPS Whole building test simulating total mains failure. Whole building test simulating total mains failure with fire alarm condition. Whole building test simulating total mains failure with generator failure simulated - – make provision Load balancing measurement and test of each DB and Switchboard Diesel fuel load flow test with all equipment running – make provision Earthing tests of each electrode. Functional test of each system, each set of systems, and integration of systems. Network test with simulated loss of one fibre optic link Proving test for each system/subsystem to prove HAND/OFF/AUTO function.

5.31

Warranty and Defects Liability

Provide 2 years warranty and defects liability period.

5.32

Maintenance

Provide comprehensive maintenance during the warranty and defects liability period including regular maintenance visits, attendance to services calls and submission of service reports for each visit. Provide attendance to service calls and submission of service report for each visit.

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WIRING AND ACCESSORIES

6.1

General

6.2

Cross Reference

Comply with General services requirements section.

6.3

Conductors and Cables

6.3.1

Quality

Pre-Completion Reports Site Tests All site tests shall be carried out as per BS 7671 Electrical installation standards as described in part 7 chapter 71 section 3. Before installation of cables, followings points should be ensured:

      

Type of cable and wire Ambient conditions Method of installation The disposition of each cable relative to other cables Fault power level Protective device ratings Motor circuit voltage drop during starting

Voltage drop and current ratings shall be calculated according to BS 7671 and IEC regulation whichever is more stringent. Submission Cable routes Submit drawings showing details of the following:

     

Sub-main cable support routes including dimensions. Switchboard layouts Spacing of cast in insitu conduits near switchboards and in congregated areas. Structural penetrations for cabling and ducting. Underground conduit routes and cable marker positions. Submit copy of test certificates from the manufacturer or an independent testing authority confirming that cables comply with the Specifications

Cable Sizing calculations General: If cable sizes are not given, submit load calculations and cable selections based on load current, fault current, earth loop impedance and voltage drop. Standards: To BS 7671, BS 5467, BS 6746 Shop drawings Submit shop drawings for all services including but not limited to power layouts, lighting layouts, and details of all major plant.

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6.3.2

Codes & Standards

The cable design, material and performance shall conform, except where otherwise specified, with the latest issues and amendments of the following codes and standards. Table 2

Cable code & standard

Codes

Description

IEC 60227

Polyvinyl chloride insulated cables of rated voltages up to and including 450/750V.

IEC 60228

Conductors of insulated cables

IEC 60287

Electric cables. Calculation of current rating.

IEC 60331

Tests for electric cables under fire conditions – Circuit Integrity.

IEC 60332

Tests on electric and optical fibre cables under fire conditions.

BS 5467

Electric cables. Thermosetting insulated, armoured cables for voltages of 600/1000V and 1900/3300V

BS 6004

Electric cables, PVC insulated, non-armoured cables for voltages up to and including 450/750V, for electric power, lighting and internal wiring.

BS 6007

Rubber insulated cables for electric power and lighting

BS 6207

Mineral insulated cables with a rated voltage not exceeding 750V.

BS 6458

Fire hazard testing for electrotechnical products.

BS 6724

Electric cables. Thermosetting insulated, armoured cables for voltages of 600/1000V and 1900/3300V, having low emission of smoke and corrosive gases when affected by fire.

BS 7211

LSF insulated non armoured cables / wires

BS 7629

Electric cables. Specification for 300/500V fire-resistant electric cables having low emission of smoke and corrosive gases when affected by fire. Multicore cables

BS 7846

Electric cables, 600/1000V armoured fire-resistant electric cables having thermosetting insulation and low emission of smoke and corrosive gases when affected by fire.

BS 7889

Electric cables. Thermosetting insulated, non-armoured cables with a voltage of 600/1000V, for fixed installations.

BS EN 50525

Electric cables. Low voltage energy cables of rated voltage up to and including 450/750V (Uo/U) cables for general applications.

6.3.3

Design

System Particulars Cables covered in this specification will be used on the following system

 

22 kV – 3 – phase , 3 wire, 50Hz, neutral low resistance earthed 400V – 3 – phase, 4 wire, 50Hz, neutral solidly earthed.

Cable Construction a) Medium voltage, XLPE insulated, PVC inner sheath, SWA, PVC outer sheathed power cables. Voltage grade Uo/U Um

: 12.7 / 22kV for 22kV system : 24kV

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Conductors be 25mm2

: Stranded annealed cooper. Circular or shaped section. Minimum size shall

Conductors screen

: Extruded semi conductive compound

Insulation

: Cross linked polyethylene

Core identification

: Coloured Brown, black, grey

Insulation Screen

: Extruded semi conductive compound, bedding of semi conductive tape and earth screen of copper tape. Copper tape screen shall be designed to carry the earth fault current of the system for a period of one second without exceeding the permissible temperature rise.

Conductor Lay

: Cores laid up with extruded PVC fillers to form a circular cable

Bedding

: Extruded polyvinyl chloride

Armouring

: Galvanized steel tape armoured single core cables shall have aluminium wire armouring

Outer Sheath

: The outer sheath of cable shall be an extruded layer of polyvinyl chloride intrinsically flame retardant and anti-termite protected. Cables shall meet the requirements of BS EN 50266 and IEC 60332-1.

Low voltage, XLPE insulated, LSF bedding, Steel Wire Armoured, LSF outer sheathed power and control cables. Voltage grade

: 0.6 / 1kV

Conductors

: Stranded annealed cooper. Circular or shaped section.

Insulation

: Cross linked polyethylene

Core identification

: Up to four cores colored (Brown, black, grey, and Blue). All control cables shall be colored white with black numbers along the length of cores at 150mm intervals

Core numbering shall be of the non-fading type. 3 core cables used for lighting shall have (Brown, black, grey, and Blue colors for the cores). Conductor Lay

: Cores laid up with extruded PVC fillers to for up to 5 cores. For 6 cores or more wrapping of polyester tape.

Inner sheath / Bedding : Low Smoke Fume sheath Armouring

: Galvanized steel tape armoured. Single core cables shall have aluminium wire armouring.

Outer Sheath

: The outer sheath of cable shall be an extruded layer of Low Smoke Fume Sheath colored black, intrinsically flame retardant and anti-termite protected. Cables shall meet the requirements of BS EN 6724 and IEC 60332-1.

LSF insulated, single core cable (wire) for use in conduits. Voltage grade

: 450 / 750V (IEC)

Conductors

: Stranded annealed cooper. .

Insulation etc.,

: Low smoke and fume thermosetting (colour brown, black, grey, black and as required)

Earthing Cable

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Voltage grade

: 450 / 750V

Conductors

: Stranded annealed cooper. .

Insulation

: Low smoke and fume thermosetting (colour green & yellow)

Aluminium conductors are not to be used unless specifically required by the design documentation. Cable Drum Cable shall be drummed in maximum continuous lengths on non-returnable cable drums. Cables end shall be sealed and fixed to the drum. Cable drums shall be fitted with battens, fixed around the entire periphery of the drum. All cable drums shall have their identification reference clearly stencilled on the outside of both flanges. Drum identification labels shall be attached on the outside and inside of the drum flange. Labels shall be robust and non-fading and give the following information:

       

Drum identification number Voltage grade Cable construction (i.e. XLPE,LSF,SWA, and LSF) Number of cores and cross sectional area Cable length Purchase order number and item number Manufacturer’s name Drum weight

In addition to the information required by the specified standards, the following information shall be embossed everyone one meter along the entire cable length on the external surface of the outer sheath.

    

Number of Cores Size of Conductor Voltage rating Manufacturer’s name Remaining cable length

Example: 4 Core 25mm2 1kV grade. (XXX Manufacturer) Data to be furnished by the Manufacturer The following data shall be furnished by the manufacturers: a) Insulation thickness b) Diameter under armour c) Diameter over armour d) Overall diameter e) Current rating in air and ground for the ambient conditions specified f) Resistance, reactance per KM g) Maximum continuous drum length for each size of cable h) Maximum pulling tension i) Minimum recommended Bending Radius

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6.3.4

Application

Wires and cable installed in conduits shall be of the LSF type single core to BS7211. b) All power cables shall be XLPE insulated, armoured type, PVC sheathed of LSF as specified, (for size of cable 4mm2 and above sizes) as per BS 5467. c) All lighting distribution wiring shall be LSF insulated wiring cables non-armoured to BS 7211 enclosed in trunking / conduit. d) All control cables shall be XLPE insulated, armoured, PVC sheathed, min. 1.5mm2 copper conductors of 600/1000V grade as per BS 5467. e) Fire resistant FP200 (gold) shall be used for emergency services. f) All conductors shall have the colour impregnated into the insulation at the time of manufacture. g) Painting of conductor insulation will not be accepted. h) Type and size of cables shall be as indicated in the electrical schematic diagrams, electrical load schedules and other related drawings. i) Unless, otherwise indicated, the following connection and wiring details shall apply throughout the works: i) Radial for specific equipment circuit ii) Final Circuit to equipments or appliances iii) Lighting Circuits up to 1000 Watts:  10A breaker protection wired with 3 x 2.5mm2 LSF wires iv) Lighting Circuits 1000 to 1800 Watts:  16A breaker protection wired with 3 x 2.5mm2 LSF wires v) High integrity earthed 13A socket outlets:  32A breaker protection on ring main basis wired with 4 x 4.0mm2 + 2 x 4.0mm2 LSF wires vi) Unit water heaters up to 3 kW rating:  20A breaker protection wired with 2 x 4.0mm2 + 1 x 4.0mm2 LSF wires vii) Fan Coil units each:  20A breaker protection wired with 2 x 4.0mm2 + 1 x 4.0mm2 LSF wires viii) Electric Hand dryers:  20A breaker protection wired with 2 x 4.0mm2 + 1 x 4.0mm2 LSF wires ix) Motors:  Motor rating ≤ 150kW – 150% of motor full-load current. Minimum size of 4.0mm2 LSF cables / wires. (Fire rated cables for emergency service)  Motor rating >15kW – 125% of motor full-load current. Minimum size of 4.0mm2 LSF cables / wires. (Fire rated cables for emergency service) The above details for connections shall apply throughout the works, except where the IEE Regulations would be violated in respect of permissible voltage drop. In such cases the contractor shall utilize a larger conductor size as appropriate. j) Cable specification and manufacture must be consistent throughout each wired system. All cable utilized must be continuously run from source to termination, without any through jointing included. k) The cables connected in parallel shall be of the same type, cross sectional area, length and disposition and be arranged so as to carry substantially equal load currents.

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Where cables are to be connected to bus bars, breakers and etc. The insulation and/or sheath shall be removed for a distance of 150mm from the connection and replaced by suitable heat-resisting insulation. 6.3.5

Execution

Installation

 

Installation of cables shall be carried out as per BS767, reference table 4A1.

 

Where cables are permitted to traverse channel-ways or similar on continuously mounted fl



Heat resisting flexible cables shall be used for final connections to any appliances containing a heating element or any appliance emitting heat and from the termination point (ceiling rose) to the luminaires. Heat resistant cable shall be as per BS 6500.

 

Circuit protective conductors shall be used throughout the installation.



Cables shall be ‘combined’ as drawing-in proceeds and the neutral and circuit protective conductor of each circuit shall be run with the phase cable(s) of that circuit.

 

Cables of one circuit shall run in the same conduit.



Clip cables neatly to tray with cable separation and support spacing as recommended by the manufacturer.



Where more than two power cables are run together, provide a cable tray. Secure cables with cleats, saddles or ties as appropriate for location and use spacers where more than one layer is required.



Install cables in accordance with the manufacturer’s instruction and using the manufacturer’s approved terminating devices and considering the manufacturer bending radius.

 

Terminate all single conductor cables entering steel cabinets in a non-ferrous plate.



Run surface cables similar to exposed conduit installations. Run cables concealed above ceilings in finished areas. Where exposed, run parallel to building lines. Avoid proximity to water.



All conductors requiring bolted connections shall be terminated with compression lugs using an automatic tool which will only release after correct crimp depth is obtained. Soldered connections or lugs are not permissible.



Identify multicore cables and trefoil groups at each end using stamped non-ferrous tags clipped around each cable or trefoil group.

 

Identify the origin of all wiring using legible indelible marking.

Provide permanently fixed conduit enclosures assembled before installing wiring. Provide draw wires to pull in conductor groups from outlet to outlet, or use ducts with removable covers.

All bolted connections shall have spring washers. Pinch screw terminals may not be used for conductor greater than 6.0mm2.

The conduit and/or trunking system shall not be used exclusively as a circuit protective medium. Circuit protective conductors shall be coloured green and yellow.

Cables of a circuit when run in trunking shall be ‘grouped’ together with approved plastic binding clips. Tape shall not be used.

Where cables pass through a floor or fire barrier provide a cable transit or equivalent fire stop with openings sized for the cables.

After ‘marking off’ all cables shall be tested with a 1000V ‘Megger’ before erection. All cables shall be tested not less than 24 hours after completion. Nothing less than an infinity reading will be acceptable between conductors or between any conductor and the cable sheath, and conductors being

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disconnected from the apparatus. The Contractor shall provide evidence of these tests to the Consultant / Client. Fire Barriers



Where conduit, ducting and/or trunking pass through fire-resistant structural elements such as walls and floors designated as fire barriers, the opening made shall be sealed with a cable transit or equivalent fire stop.

Jointing and Terminations



All cable conductors shall be fitted with a correctly sized cable socket or thimble and a means of identification. The cable sockets may be of the sweated or crimped compression types.



Identification ferrules: Provide durable numbered ferrules fitted to each core, and permanently marked with numbers, letters or both in accordance with the connection diagrams/shop drawings.

  

Cable lugs shall be tinned copper compression type.

  

Joint in HV/MV cables shall be carried out using heat shrinkable kit.

Cable glands shall be brass type compression type with earth clamping. Cable insulation/sheath shall be removed for a distance of 150mm from the connection and replaced by suitable heat resisting insulation.

All cable joints/terminations shall be strictly in accordance with cable manufacturer recommendations. Termination kits shall be compatible to the cables used with and the same shall be confirmed by cable manufacturer.

6.3.6

Testing & Commissioning



All cable type shall have been subjected to Type Tests in accordance with relevant IEC or British Standards. Type test certificates shall be furnished.



All cables shall be subjected to routine tests at the cable manufacturer’s in accordance with the relevant IEC or British Standard, tests shall be subject to the Consultant /Client witness if required.

6.4

Wiring Enclosures and Cable Supports

6.4.1

Conduits and Trunking

Conduits and Trunking requirement shall be as per IEE Wiring Regulation



All plastic conduits and trunking must be comply with both BS 4607 and BS 60423R and be suitable for the ambient conditions expected.



All metal conduits and trunking must be comply with BS 4568, BSEN 60423 or BSEN 50085.Flexible conduits must be of metal construction, PVC covered and comply with BS68316-1.



Metal conduits may not be used as the sole means of providing an Earth (separate Earth Conductors must be run inside the conduit).



Plastic conduits or trunking must be used in situations subject to higher than normal temperatures or fire risk (e.g. near industrial machinery, generator rooms, workshops, petrol station etc.).

 

All exposed conduit shall be of steel type. Conduits and trunking must be installed so as to provide ease of access to cable Circuits throughout the route. Sufficient inspection plates and pulling points must be provided to enable inspection, repair and drawing out of cables throughout the life of the installation.

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

The minimum internal radius on any bend or elbow fitting in a conduit shall be 2.5 times the diameter of the conduit Elbow fittings of trunking may be 90 degree formation if the cover is removable so as that cables may be installed without the need for pulling through.



Cable trunking shall generally be run exposed or otherwise accessible after installation throughout its length for the purpose of removing/installing cables.

Minimum sizes Metallic and non-metallic conduits: 20mm. Rigid conduits Provide straight long runs, smooth and free from rags, burrs and sharp edges. Set conduits to minimise the number of fittings. Remove sharp edges prior to drawing-in wires. Flexible conduits Run fixed wiring to motors and appliances requiring flexible connections in rigid conduit to a junction box adjacent to the item of equipment, and from there in flexible conduit to the equipment. Provide flexible conduit connections between 300mm and 600mm in length. Galvanising If installed in damp locations, galvanise mild steel wiring enclosures and support systems. Set out If exposed to view, install conduits truly vertical or horizontal and in parallel runs with right angle changes of direction. Inspection fittings Provide in accessible locations. Draw cords General: Provide draw cords in conduits not in use. Leave 1 m of cord coiled at each end of the run. Material: Polypropylene cord, or insulated stranded earth wire, 2.5mm2 minimum size. Draw in boxes General: Provide draw in boxes in accessible positions and at intervals not exceeding 30m in straight runs, and at changes of level or direction. Provide draw-in boxes no greater than 7.5 m apart for vertical lengths of conduit runs. Underground draw-in boxes: Provide gasketted covers and seal against moisture. Outlet Boxes

   

Outlet boxes shall be manufactured of galvanized sheet steel, unless otherwise specified.

  

Outlet boxes in walls, ceiling or floors shall be of an approved type suitable for the construction.

Use metal clad weatherproof boxes in outdoors or in damp locations. Use metal clad boxes where surface mounted in unfinished areas. Ceiling boxes shall be 75mm circular or square, and 50mm deep complete with fittings where required to support fixtures.

Brass earth lead shall be provided for the outlet box to allow connection of earth wire. All circular PVC boxes where used to support light fittings shall be provided with steel insert clips.

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Bends and elbows Bends: Make with easy sweeps. Provide bends of 90° with a radius of not less than three times the external diameter of the conduit, without mechanical stress sufficient to cause deformation. Limit the number of 90° bends between boxes in any conduit run to 2. Solid elbows not permitted. Conduit saddles and brackets Space conduit saddles a maximum of 1200 mm apart for metallic conduit and 1000 mm apart for nonmetallic conduit. In areas subject to high ambient temperatures or other severe duty, maximum saddle spacing for non-metallic conduit 500 mm. Where two or more conduits are run in parallel they may be grouped. Provide suitable surface brackets where conduits cannot be fixed. 6.4.2

Concealed Conduits

Routes Conduits concealed in wall chases, embedded in floor slabs or installed in inaccessible locations: Run directly between points of termination, minimising the number of sets. Do not use inspection fittings. 6.4.3

Metallic Conduits and Fittings

Type Screwed steel. Corrosion protection For steel conduits, paint ends and joint threads with zinc rich organic binder to GPC-C-29/16. Expansion joints General: Provide flexible couplings consisting of flexible conduit and fittings, at:

 

Structural expansion joints. In long straight runs if the ambient temperature varies by more than 40oC.

Conductivity: Maintain electrical conductivity between the two ends of rigid metallic conduit. Movement: Provide conduit support saddles close to flexible couplings to permit free movement for expansion and contraction. Sets and bends Make sets and bends cold with bending machines in such a manner that there is no damage to or distortion of the conduit. In locations where it is not practicable to use sets for changes in direction, make such changes by the use of screwed fittings. 6.4.4

Non-Metallic Conduits and Fittings

Conduits in roof spaces Locate below roof insulation and sarking: In accessible roof spaces, provide mechanical protection for light-duty conduits. Conduits in slabs High compression corrugated conduit, restrain at regular intervals to achieve a nominally straight run. Flexible conduit Provide for equipment and plant subjected to vibration, required for adjustment or ease of maintenance. Ensure that the flexible conduit is of adequate length to avoid any strain on the conduit or terminations under all conditions of use.

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Sets and bends Form with a spring or other device inserted in the conduit to prevent distortion of the walls. The forming of conduit bends using heat from a naked flame or similar method which may damage or deform the conduit will not be accepted. Associated fittings Type: The same type and material as the conduit. Provide standard manufactured bends for all PVC conduits of larger than 25 mm diameter. Wall boxes on UPVC conduits: For special size wall boxes not available in UPVC, provide prefabricated earthed metal boxes. Inspection fittings Provide inspection type fittings only in accessible locations and where exposed to view. Joints Type: Cemented or snap on joints. Expansion couplings: If encased in concrete, do not provide bellows type. Expansion joints Where any straight section of PVC conduit exceeds 3.8 m provide an expansion joint for each 3.5 m or part thereof along the entire length of the straight section. Install conduit clips close to expansion joints, while allowing the conduit to move longitudinally freely while expanding or contracting. 6.4.5

Cable Supports

System Provide a complete cable support system consisting of baskets, trays or ladders and including brackets, fixings and accessories. Fabricate brackets, racks and hangers from structural steel sections or other materials in sections of equivalent strength. Maintain earth continuity of the entire cable support system. Manufacture Use proprietary baskets, trays, ladders and accessories from a single manufacturer in the same application. Cable Baskets Materials:



Interior. Zinc-coated steel, stainless steel, or steel with two-pack liquid coating, air drying enamel or stoving enamel finish.

 

Exterior. Hot dip galvanised steel or stainless steel. Cuts. Shall have galvanising made good.

All accessories, supports, joints, bends, tees and radii shall be selected from the same manufacturers range of product. Cable trays Materials:



Interior: Zinc-coated steel, or steel with two-pack liquid coating, air-drying enamel or stoving enamel finish.

 

Exterior: Hot dip galvanised steel. Cuts: Shall have galvanising made good.

Minimum steel thickness:

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   

Trays < 150mm wide: 1 mm. Trays > 150mm, < 300 mm wide: 1.2 mm. Trays > 300mm wide: 1.6 mm. Folded edge > 19mm deep and radiused.

Perforations: To Admiralty pattern, reverse stamping. Accessories: Use fish plates or splines for tees, crosses and joints. Cable ladders General: Use 2 folded steel or extruded structural grade aluminium side rails minimum 75 mm deep with cable support rungs between the rails and complete with requisite bends, risers, tees, reducers, splicers fixing brackets, supports, hangers and the like. Steel ladders: Galvanised. Rung spacing: 300mm maximum. Small cables: Run cables less than 13mm diameter in cable trays or ducts. Structural sections:

 

Angles and bars: 6.5mm minimum thickness. Rods: 10mm minimum diameter.

Single Spine Cable Baskets, Trays or Ladders Provide cable trays with central supports and twin cantilevered trays to facilitate side loadings of cables. Maximum width: 400mm each side. Central support: Resistant to asymmetric loadings. Fixing to building structure General: Install parallel to walls, floors and ceiling lines. Fix supports to the building structure or fabric by means of direct fixing, hangers or brackets. Spacing: Space supports at maximum intervals of 1.5 m for trays and 3 m for ladders. Access Provide a minimum of 150 mm free space above and 600 mm free space on one side of trays and ladders. Cable fixing Provide slats or rails suitable for fixing cable ties, strapping or saddles. Bend radius Provide bends with a minimum inside radius of 12 times the outside diameter of the largest diameter cable carried. Cable protection Provide rounded support surfaces under cables where they leave trays or ladders. Cable strapping Provide steel straps on MIMS cables. Minimum clearances Hot water pipes: 200mm. Boilers or furnaces: 500mm.

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Penetrations Where trays or ladders pass through ceilings, walls and floors, provide neat, close fitting apertures. Where these penetrate fire rated structures, terminate the ladders either side of the opening. Expansion joints Building expansion joints: Install not to resist relative movements of building sections.

6.5

Underground Services

6.5.1

General

Standards and rules To BS 7671 and all other relevant British Standards and to the requirements of EVN and other relevant local authorities. 6.5.2

Cables and Conduits in Trenches

Category 1 Circuit: a Circuit (other than a fire alarm or emergency lighting Circuit) operating at LV and supplied from the Distribution Company. Category 2 Circuit: a Circuit (other than a fire alarm or emergency lighting Circuit) which supplies telecommunications equipment (such as telephones, intruder alarms, data transmission, call bells, etc). Category 3 Circuit: a fire alarm or emergency lighting Circuit. Sand bed and surround Provide clean sand under and around cables and conduits installed underground. Clear the bottom of the trench of all rocks, stones and other hard and sharp materials. Fill the trench to a depth of 50mm with a layer of selected filling prior to cable placement. Sealing ducts and conduits Seal buried entries to ducts and conduits using waterproof seals. Seal spare ducts and conduits immediately after installation. Seal other ducts and conduits after cable installation. Seal the ends of conduits entering the building with a weak concrete slurry to prevent moisture and vermin entry. Seal the joints of all conduits or pipes enclosing PVC/PVC and XLPE/PVC wiring with approved PVC jointing compound. Draw wires Arrange so that cables may be drawn out of the duct and conduit in the event of any cable failure. Install 4 mm² polypropylene draw string or 2.5 mm² galvanised steel wire in conduits for future installation of cable. Water proofing: Provide puddle flanges around conduits where they pass into cable pits. Install bell mouth accessory on end of conduit located within wall of pits and flush with inside surface of pits on conduits > 100mm dia. Pipe ducts and conduits Bedding: 50 mm compacted depth, compacted fill and extending the full width of the trench. Layout: Avoid sharp bends and locate drawing in points above ground. Cleaning: Swab clean before installing any cables. 6.5.3

Cable Pits

General Sizes: Minimum 600 x 600mm. Allow for turning of cables at above the minimum acceptable bending radius.

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Location: Provided at every major change in direction of a pipe duct and conduit, or at 100 m minimum intervals on long straight duct and conduit routes. Cable support: Use galvanised iron brackets to separate layers of cables in the pit. Slack cables: Leave maximum length of slack cables in pits to cater for future alteration. Pit covers General: Provide pit covers to suit expected loads of pedestrian or vehicular traffic in the location in which it is installed. Fit flush with the top of the pit. Use reinforced concrete or load carrying "Gatic" type or similar. Cable pit cover to be double sealed grid A heavy duty if pass in the road way, other ways to be grid B medium duty. Lifting handles: Provide a lifting handle for each size of cover section. Drainage General: Provide drainage from the bottom of cable pits, either to absorption trenches filled with rubble or to the storm water drainage system.

6.6

Accessories

6.6.1

General

Supply and install all accessories, outlets, appliances and connections complete with fixings and fastenings. Selection: Compatible with the final interior design. Orientation: Compatible with the final design. Position: Make allowance for accessories to be relocated within a radius of 2 meters. Acoustic separation: Satisfy the project requirements for acoustic separation. Labelling: Provide proprietary labels, ie Clipsal ID mechanisms, or engraved traffolyte labels. Printed adhesive labels are not acceptable. 6.6.2

Construction

Face plates: High impact polycarbonate construction or metal. Protected and weatherproof: Non-corroding metal or polycarbonate enclosures. 6.6.3

Location

Mounting heights: To the centre of the equipment. Face brickwork or special finish walls: To the nearest brick, panel, tile course and mounted vertically. Rendered brick or insitu concrete walls: Recessed horizontal in standard metal wall boxes. Hollow block walls: Fixed direct to the blockwork. Lightweight stud walls or demountable partitions: Directly on the panelling using proprietary fixing brackets. Fixed furniture: Insulated and mechanically protected at the rear. 6.6.4

Plantrooms

Use W/P metal clad protected type accessories.

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6.6.5

Lighting and Socket Outlet Switches

Lighting and Socket Outlet switches requirement shall be as per IEE Wiring Regulation



All switches provided for local isolation of appliances and equipment (including lighting) shall comply with BS EN 60669. The rating of switches shall be selected based on the expected load, taking into account any capacitive or inductive effects.

 

For outdoor locations or damp/wet areas whether protected switched should be used (BS EN 60669).

 

The normal mounting height for switches shall be 1.3m from floor level.



Double pole switches must be provided for water heaters, air conditioning units & other fixed appliances operating with or near water supplies.



Cooker control units (isolators) for domestic installations should comply with BS4177. The use of cooker control units with a 3 pin integral socket outlet is prohibited (due to nee for earth leakage protection to cover all 3 pin socket outlets.



Flexible cables from switches / isolators to fix appliances (such as water heaters, cookers etc.) must be adequately rated & securely fixed with a purpose flex outlet plate (which may be integral or separate switch to switch /isolator unit). See appendix 23.

For areas with higher than normal risk of fire or explosion gas sealed switches should be used (BS EN 60079-14). E.g. in gas storage areas, battery rooms etc.

Switches with neon indicators should be provided for appliances such as water heaters, air conditioning units, fridges & freezers, where the visual indication of a continuous supply is desirable.

General Use switches of the rocker type designed for inductive and fluorescent lighting loads generally flush wall mounted. Multi switch/function: Ganged under one cover plate and arranged similar in plan to the lighting controlled. Location: On the latch side of doors and door swings. Multiphase: Separate face plates in lightweight stud walls or demountable partitions. Totally segregate switches in wall boxes by physical barriers. Minimum rating: 13 A (Inductive), 230 VAC. Indicators: to be visible with switches “on”. Maintain 150mm clearance or physical barrier between LV and ELV terminations. Multi-gang Where 5 or more switches are located together in cavity walls, install a recess mounted multi-gang stainless steel cover plate. Stainless steel cover plates: Flush mounted finished stainless steel equipped with switch mechanisms, matching plastic caps and labelled. Cover plate fixing to a wall box: Use flush head countersunk stainless steel screws. Adjustment and alignment: Incorporate fixings that enable alignment and adjustment of the cover plate. 6.6.6

General Purpose Outlets

General Purpose Outlet requirement shall be as per IEE Wiring Regulation.



Except Hotel Guestroom & FOH area, all single phase plugs socket outlets shall comply with BS1363 (3 square pin with all 3 holes covered by temper proof shutter) & must be fitted with switch.

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 

The use of 2 pin plugs such as the Euro CEE/14 plug & the ‘Shuko’ CEE/7plug is strictly prohibited.



Flexible outlet shall be rated 20A or 45A, as shown on the drawing. The flexible outlet shall be complete with 3 pair of terminals each suitable for 4mm2 conductor and 10mm diameter cord outlet for the 20A flex outlet and with 3 pair of terminals each suitable for 10mm2 conductor for the 45A. The flexible outlet shall be provided with moulded cover and cable clamp.



20A double pole switch shall be manufactured to BS 3676 and shall be fitted with neon indicator. The double pole switch supplied for the water heaters shall be engraved “Water Heater”.



Ceiling rose shall be made of white plastic and manufactured in accordance with BS 67. The ceiling rose shall incorporate tunnel type terminals with backed out terminal screws with capacity of 3 x 2.5mm2. The ceiling rose shall be suitable for mounting over a circular conduit box to BS 456 part 2.



For external / roof, unless otherwise specified, weatherproof surface/semi-recessed socket to IP56 shall be provided.



3 phase & industrial plugs & socket outlets shall comply with BS4343. The rating of socket outlets shall be selected according to the load of appliances or equipment to be connected.

 

Socket other than 13A, high impact resistant polycarbonate to BS EN 60309 shall be provided.



Socket outlets in kitchens or other areas where water is used must be positioned at least 1.5m away from sources of water ( e.g. sinks, basins filter, supply taps).

Fused spur units shall be to BS5733, double pole, and switched neon indicator, as specified, insulated pattern.

Unless otherwise shown in the drawing socket outlets accessible for normal use should be positioned at a height of 450mm above floor level or 100mm above work surface (e.g. kitchen work top). In some cases low level or ‘skirting’ height may be used for special applications (e.g. offices) at a minimum of 100mm above the floor level.

General Use outlets of the same manufacture as the switches. Power Outlets: Combination rocker switch/socket type flush wall mounted. Socket outlets: Mount outlets with the earth pins in the 6 o'clock position. Double outlets: Under one flush plate. Plugs: Provide with outlets of greater rating than 10 A 250 V. Pendant outlets: Suspend at 1800mm above floor level, with fused connection unit. Enclose sub-circuit support wire PVC flexible sheath. Use stranded stainless steel support wire. 6.6.7

Installation

General Provide flush mounted accessories except in plant rooms. Surface Mounting Type: Proprietary mounting blocks. Restricted Location Do not install wall boxes across junctions of wall finishes. Marking Label isolating switches and outlets to identify circuit origin and designation.

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BUSWAY

7.1

General

The scope of works comprises the supply, installation, testing and commissioning of a Busway system. All work necessary to complete the installation shall be performed and shall include all labour, supervision, materials and equipment necessary to provide the system as generally shown on the drawings and specified. Install a complex Busway system is an intelligent choice for high-tech building concerned with designing superior electrical distribution systems requiring fewer plugs and more space efficient areas in High-rise Complex Apartment Office Building. Plug-in bus duct shall supply three (3) phase, five (5) wire, 50 Hertz power, indoors, in a non-hazardous environment, at project weather condition. Busway design features include customizable bus plugs and 100% neutral plus 50% isolated ground that delivers clean power. Easy for Installation - joining one Busway section to another is as simple as matching ends and snapping them together. Bus bars are held securely in place by spring pressure clips located in the joint insulator. The joint is made even more rigid when an external housing plate is attached with captive screws. The built-in busway is flexibility and a low initial cost, it can also get benefit from future savings when you need new distribution boards. Save time and cost to add on busway for new or expanded facilities Years from now, busway accessories, such as section, joints, components… shall be fit and compatible with busway system in future.

7.2 (a)

General Requirements Scope

Supply and install a complete busway system indicated in the drawings. The busway system: feeders, branch-circuit tap off units, feed in unit and associated fittings. (b)

Definition

A busway is considered to be a grounded metal enclosure containing factory mounted, bare or insulated conductors which are usually copper or aluminium bars, rods, or tubes. (c)

Use Permitted

Busways shall be installed only where located in the open and are visible. Exception: Busways shall be permitted to be installed behind panels if means of access are provided and if all the following conditions are met.



No overcurrent devices are installed on the busway other than for an individual fixture from manufacturer’s guideline.

  

The space behind the access panels is not used for air-handling purposes. The busway is totally enclosed, non-ventilated type. Busway is so installed that the joints between sections and fittings are accessible for maintenance purposes.

(d)

Use Prohibited

Busways shall not be installed:

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   

Where subject to severe physical damage or corrosive vapours. In hoist ways In any hazardous (classified) location, unless specifically approved types Outdoors or in wet or damp locations

(e)

Dead Ends

A dead end of a busway shall be closed. (f)

Branches from Busways.

Branches from busways through Tap-off unit shall be made with busways, rigid metal conduit, flexible metal conduit, rigid non-metallic conduit, electrical non-metallic tubing, electrical metallic tubing, metal surface raceway or with suitable cord assemblies approved for hard usage for the connection of portable equipment or for the connection of stationary equipment to facilitate their interchange. Flexible cord assembly connections shall be permitted to be made directly to the load end terminals of a busway plug-in device, providing the connection includes a suitable tension take-up device on the cord. (g)

Sub-feeder or Branch Circuits.

Where a busway is used as a feeder, devices or plug-in connections for tapping off sub-feeder or branch circuits from the busway shall contain the overcurrent devices required for the protection of the subfeeder or branch circuits. The plug-in device shall consist of an externally operable circuit breaker or an externally operable fusible switch. Where such devices are mounted out of reach and contain disconnecting means, suitable means such as ropes, chains, or sticks shall be provided for operating the disconnecting means from the floor. (h)

Length of Busway used as Branch Circuits.

Busways which are used as branch circuits and which are so designed that loads can be connected at any point shall be limited to such lengths as will provide that in normal use the circuits will not be overloaded. (i)

Through Walls and Floors.

It shall be permissible to extend unbroken lengths of busway through dry walls. It shall be permissible to extend busways vertically through dry floors if totally enclose (unventilated) where passing through and for a minimum distance of 6 feet (1.83 m) above the floor to provide adequate protection from physical damage. Fire rate seal sealant to be provided to meet local Fire Department requirements. (j)

Marking.

Busways shall be marked with voltage and current rating for which they are designed, and with the manufacturer’s name or trademark in such manner as to be visible after installation.

7.3 (a)

Technical Data Short circuit rating and tests

The short circuit rating of the busway shall be determined according to UL standards No. 857 or IEC 60439. This rating must be based upon actual tests at the rated short circuit current. (b)

Over current Protection

Over current protection shall be provided in accordance with busway manufacture specification.

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(c)

Voltage drop

The voltage drop (input voltage minus output voltage) specified shall be based on the busway operating at full rated current and at stabilized operating temperature. The three-phase, line-to-line voltage drop shall not exceed 3.1 volts per hundred feet (10V/100m) at 40% power factor concentrated load which may exist during motor starting. The line-to-line voltage drop shall not exceed 4.0 volts per hundred feet (13V/100m) at the load balance with power factor which produces maximum voltage drop in the busway.

7.4 (a)

Components Housing:

The busway housing shall be constructed of code gauge steel and aluminium to reduce hysteresis and eddy current loses and shall be provided with a suitable protective finish of ANSI 49 grey epoxy paint. The busway housing shall be totally enclosed non-ventilated for protection against mechanical damage and dust accumulation. The totally enclosed housing shall be manufactured by the busway manufacturer. Modifications of busway to make it totally enclosed by other than the busway manufacturer voids the manufacturer's warranty. Busway so modified is unacceptable without the written consent of the manufacturer. The housing shall be the totally enclosed type unless otherwise noted on the drawings and constructed to meet NEC Gauge Steel Specifications with a medium gray baked-on enamel protective finish. As many sections as possible shall be ten foot lengths. Special sections and fittings shall be provided only where required to suit the installation. (b)

Busbars:

Busbars shall be silver flashed copper. Each bus bar shall be insulated with Class B rated 130 ·C vendor certified. The temperature rise at any point in the busways shall not exceed 55 ·C rise above ambient temperature when operating at rated load current. Both feeder and plug-in busway (800 A and above) shall be of sandwich construction, meaning no air gap shall exist between bus bars (phases, neutral) except at plug-in in openings (c)

Joints:

All joints shall have a minimum of two plated nuts, bolts and lock-washers. A specially designed bus joint for copper using one bolt may be used provided adequate pressure on the bus bars can be obtained and maintained and the completed joint assembly prevents twisting, turning or bending. All bolted connections shall use Belleville washers, and all contact surface shall be silver plated. The bolt shall be torque indicating and at ground potential. The bolt shall be two-headed design to indicate when proper torque has been applied and require only a standard long handle wrench to be properly activated. Access shall be required to only one side of the busway for tightening joint bolts On busway 800 A and above, it shall be possible to remove any joint connection assembly to allow electrical isolation or physical removal of a busway length without disturbing adjacent busway lengths. (d)

Plug in openings on busways:

On plug-in busway there shall be five dead front, hinged cover type plug-in openings on each side of ten foot lengths. On riser busway, the plug - in openings shall be placed on one side only. All openings shall be usable simultaneously.

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Busways shall be installed so that plugs are side mounted to permit practical use of all ten plug-in openings for plug – in type and five plug-in openings for riser type. It shall be possible to inspect the plug-in opening and bus bars prior to the installation of the plug-in unit. (e)

Supports

Hanger spacing shall be noted on layout drawings and shall not exceed manufacturers recommendations. Indoor feeder, riser and plug-in busway shall be approved for hanger spacing of up to 10 ft for horizontally mounted runs and 16 ft for vertically mounted runs. Outdoor feeder busway shall be approved for spacing of up to 5 ft for horizontally or vertically mounted runs. Torque: After installation but before the equipment is energized, all bolted connections of currentcarrying parts shall be tightened with a torque wrench to the value recommended by the equipment manufacturer. (f)

Plug-in unit protection devices

Each plug-in unit shall be mechanically interlocked with the busways housing to prevent installation or removal of plug-in units while the switch is in the ON position, and be equipped with an operating handle which always remains in control of the switching mechanism. Covers of all plug-in units must have interlocks to prevent the cover from being opened when the switch is in the ON position. Plug-in enclosures shall make positive ground connection with the ground bus before the jaws make contact with the phase bars. The ground method shall be such that it cannot be defeated by future painting of the busways housing. The plug-in units shall be equipped with internal barriers to prevent accidental contact of fish tape and conductors with live parts on the line side of the protective device during time of wire pulling. Busways, Plug-In Unit, Circuit Breakers shall be compatible. Circuit breakers shall have short circuit interrupting capacity, voltage and trip rating as indicated on the drawing. (g)

Fitting, accessories

Provide bus duct with all the necessary fittings, accessories, such as elbows, hangers, tap boxes, expansion lengths, fittings, etc. Hangers and supports shall be the manufacturer's standard accessories.

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LV SWITCHBOARDS

8.1

General

8.1.1

General

Comply with the General Services Requirements section. 8.1.2

Code & Standards

The assemblies and the associated equipment shall conform to the requirements of the latest edition of the following standards and codes where applicable: cable design, material and performance shall conform, except where otherwise specified, to the latest issues and amendments of the following codes and standards. Table 3

LV switchboard code & standard

References

Standards Description

BS EN 60947, IEC 60529, BS EN 61439-1

Low Voltage Switchgear and Control Gear Assemblies

BS EN 60947-2, BS EN 60898

Circuit Breakers, Isolator / Switch Disconnectors

BS EN 60947-1, BS EN 60947-3

Current Transformers

IEC 60138

Voltage Transformers

IEC 51, IEC 414

Measuring Instruments

BS EN 60947-1, BS EN 60947-4

Contactors

BS EN 60947-1, BS EN 60947-4

Overload Relays

BS EN 60947-1, BS EN 60947-5

Control Relays

BS EN 60947-5-1, IEC337-1, IEC 60536

Indication lamps, Push Buttons, Switches

BS EN 60947-6

Automatic Transfer Switching

BS EN 61008, BS EN 61009

Residual current circuit breaker

BS 88, IEC 269

Low voltage fuse

8.2

Components

8.2.1

LV Cubical Switchboards

General

  

L.V. cubical switchboards shall be manufactured and fully imported from G7 countries.



The switchboard shall be fabricated, assembled, wired, checked, tested and co-ordinated at the factory for all internal switchgear components and shall be constructed in accordance with BS EN 60439-1.



The switchboards shall be equipped with Air Circuit Breaker. Moulded case circuit breaker, relays, instruments, transformers, ancillary devices necessary for operation protection or measurement purpose and Auto Transfer Switch with Manual by pass arrangement as indicated in the drawings.

L.V. cubical switchboards shall be Form3B. L.V. cubical switchboards shall be of indoor construction, purpose made, floor standing, totally enclosed, cubical type, and duct protected vermin proof and of clean and modern appearance containing the main component s shown on the drawings and or specified.

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

The normal components, fittings and accessories required for safe and proper operation of switchgear shall be provided, whether specifically mentioned herein or not.



To withstand thermal and mechanical stresses set up by short circuit set up by short circuit conditions in accordance with the fault through current of feeding transformer. In general fault braking capacities for main switchboards shall be as stipulated in Electricity Wiring Regulation.

8.2.2

Regulations

All LV switchboards / distribution requirements shall be comply with IEE Wiring Regulation.

 

All distributions Boards must be factory assembled and comply with BSEN 60439-1.



Apparatus forming part of assembly of distribution Boards shall have electrical isolation clearances sufficient to withstand normal voltages, surge voltages & creepage as defined in BS EN 60439-1.



Each Distribution Board must have a neutral bar which is mounted on insulators & which has a sufficient number of terminal points of adequate size for the largest cable expected to be used.



Each distribution board must have an earth bar which has means of connection to the incoming earth conductor & cable gland of the incoming cable.



Distribution Boards must have split busbars where different levels of earth Leakage protection are required (generally 100mA RCD & 30mA RCD, with additional RCBO devises for more sensitive protection, such 10mA for swimming pools).

 

A single RCD protection shall be provided and limited only to a maximum 3 single phase circuits.

    

All outgoing circuit breaker shall be provided with earth fault relays and overcurrent relays.



Switchboards rated at 1600A and above must be provided with earth fault relays and overcurrent relays.



Replaceable fuse links are not preferred in customer Distribution boards (MCBs or equivalent should be provided). The use of re-wireable fuse links is prohibited.



Distribution Boards must be installed in locations easily accessible for inspection, operation & maintenance. Such locations must be secured from unauthorised interference, particularly from children.



Distribution Boards shall not be installed in locations where water is used (e.g. kitchens, bathrooms, pump rooms), within 2m of any pipe or other source of water, or in difficult to access positions.



Distribution Boards must be provided with sufficient numbers of protective Device positions (e.g. MCBs) including spare positions (at least 15% spare positions are recommended in Starwood guideline).

Distribution Boards must be robust construction, capable of withstanding expected electrical, thermal, and environmental stress in normal operation and during faults.

All outgoing circuit breaker with high rating, such as motor loads, shall be provided with ELR “Earth Leakage Relay”.

Single phase Distribution boards are permitted for loads up to a maximum of 9kW. The phase & neutral busbars shall be identified by the colours as given in IEE Wiring Regulation. The phase & neutral conductors shall be of the same cross sectional area. Switchboards rated above 400A must be provided with instruments for voltage, current, maximum demand and power factor measurement, as well as phase indicating lamps.

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8.3

Quality

8.3.1

Inspection

Witness Points Give notice so that inspection may be made at the following stages:

   

Factory assembly completed, with busbars exposed and functional units assembled. Assembly ready for production tests. Assembly installed and connected, prior to site tests. Commissioned and complete.

8.3.2

Pre-Completion Tests

Type Tests The main switchboard shall be tested in accordance with the applicable parts of BS EN 61439. Production Tests Carry out the following tests and checks:



Dielectric testing:

Busbars and switchgear: 2.5kV r.m.s. for 60 seconds at mains frequency. 1 kV insulation resistance test before and after the 2.5kV test. Readings shall be >50MΩ, with no reduction between readings. Secondary wiring insulation with 1kV insulation resistance test, readings ≥1 mega Ohm.



Assemblies: Electrical and mechanical routine function tests at the factory using externally connected simulated circuits and equipment. Operate and functionally test mechanical devices, relays, programmable logic controllers and logic controls, protection, interlocking, metering, indicating and alarm equipment.



Residual current devices: Test using apparatus which displays the trip current and trip time of each device.



Protection relays: Primary current injection tests or, if approved, secondary current injection tests, to verify time/current characteristics and settings. Use manufacturer’s test ports to simulate current injection test for microprocessing equipment.

   

Check C.T. for polarity and connection.

 

Earth continuity test.

Conductance testing: Millivolt drop tests on busbar joints. Isolate solid state devices during testing. Check termination and gland provisions to ensure that they are suitable for cables to be installed on site. Mechanically check clamps, fixings and terminations.

Functional check test for metering, MCCB, ELR, UVR, HZ meter, etc.

Site Tests Carry out Insulation Resistance tests on the switchboard assembly after installation and before energisation, to verify the IR readings. Demonstrate ≥1 mega Ohm resistance using 1kV test insulation test, with all sub-mains connected. Repeat millivolt drop tests on busbar joints.

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Isolate solid state devices during testing. Measure fault loop impedances. Set settings of protection devices. 8.3.3

Contractor's Submissions

General Submit type test certificates for components, functional units and assemblies including internal arcingfault tests and factory inspection and test report. Submit confirmation that no composite wood product used in the switchboard or all composite wood products is low emission formaldehyde. Type Test Data General: Verify that type tests and internal arcing-fault tests, if any, were carried out at not less than the designated fault currents at rated operational voltage. Product Data for Proprietary Assemblies Submit the following:

          

Types and model numbers of items of equipment. Overall dimensions. Fault level. IP rating. Rated current of components. Number of poles and spare capacity. Mounting details. Door swings. Paint colours and finishes. Access details. Schedule of labels.

Shop Drawings of Custom-built Assemblies Submit shop drawings showing:

    

Types, model numbers and ratings of assemblies.

   

Fault level and rated short circuit capacity characteristics.

Component details, functional units and transient protection. Detailed dimensions. Shipping sections, general arrangement, plan view, front elevations and cross-section of each tier. Projections from the assembly that may affect clearances or inadvertent operation, such as handles, knobs, arcing-fault venting flaps and withdrawable components.

IP rating. Fixing details for floor or wall mounting. Front and back equipment connections and top and bottom cable entries.

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   

Door swings.

   

Terminal blocks layouts and control circuit identification.

  

Location of MEN link, neutral and earth connection points.

External and internal paint colours and paint systems. Quantity, brand name, type and rating of control and protection equipment. Construction and plinth details, ventilation openings, internal arcing-fault venting and gland plate details.

Single line diagrams and control wiring diagrams. Details of mains and sub-main routes within assemblies. Busbar arrangements, links and supports, spacing between busbar phases, and spacing between assemblies, the enclosure and other equipment and clearances to earthed metals.

Internal separation and form of separation and details of shrouding of terminals Labels and engraving schedules.

8.4

Switchboard Assemblies

8.4.1

Construction

Provide rigid, ventilated, insect-screened enclosures consisting of panels, doors, or both, giving the designated enclosure separation and degree of protection. Provide TTAs or PTTAs generally and NTTAs only where scheduled. Provide specified certificates to show compliance with the internal arcing fault tests of BS EN 60439-1 Fabricate from sheet metal of rigid folded and welded construction. 8.4.2

Colour

External:

XI5 Orange.

Internal:

The enclosure shall be powder coated to RAL 7035 shade.

8.4.3

Degree of Protection

Assemblies for indoor: Minimum IP 42. Assemblies for outdoor: Minimum IP54W for exterior surfaces and IP40 for interior operating face. Outdoor assembly likely to be subject to pressurised water sprays: IP56W 8.4.4

Service Conditions

Normal service conditions. 8.4.5

Fault Levels

Rated short-circuit current: Maximum prospective symmetrical r.m.s. current at rated operational voltage, at assembly incoming supply terminal, excluding effects of current limiting devices. (Imsc). Assembly short-circuit capacity characteristic: Rate main circuit supply and functional units as follows:

 

Back-up protective device not provided: Rated short-circuit current for 1s. Back-up protective device provided: Rated short-circuit current for the maximum opening time of the associated protective device.

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Tested levels: Do not use equipment at fault levels higher than tested levels, unless provided with fault current limiting back-up protection. 8.4.6

Separation

Distribution boards for lighting and general purpose outlets: Form 2B to BS EN 60439 8.4.7

Spare Facilities

Provide space for a minimum of additional circuits and equivalent spare capacity in busbars and power supply as follows:



Distribution boards: at least 15% on number of poles. Busbar rating as per SLD.

8.4.8

Mounting

Floor mounted: Assemblies generally. Wall mounted: Front access assemblies with frontal areas 16 mm2: Provide stud-type terminals ≥ 5mm diameter, sized to continuously carry the load. Cables > 70 mm2: Stud type terminals, fixed to a DIN-type or G rail. Tunnel terminals: Provide insulated sleeve ferrules to flexible cables terminated in tunnel terminals.

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Type: Screw-tightened, clip-on, 35 mm DIN-type, flexible, non-flammable and, as a minimum, suitable for the insertion of a screwdriver blade. Shrouded terminations:



Form 4 separation (where specified): Cut and shaped polycarbonate solid sheet rigidly fixed into position, with cable cut-outs to underside.



Degree of protection: IP2X minimum.

Location: Locate terminals to provide access for connections to outgoing terminations. Mounting rails: Screw or rivet mounting rails to assembly < 500 mm centres. Provide sufficient length to accept a further 20% terminal or 3 terminals, whichever is the greater. Arrangement: Terminate internal wiring to one side of the terminal block, leaving the other side for outgoing circuits. Grouping: Provide separate terminal groups for final sub-circuit and control wiring. Provide oversized barriers between each group of terminals having different voltages and terminal size.

 

Terminals for power wiring: 3 phases or single phase and neutral. Control terminals: In alphabetical or numerical order of wire identification, with the lowest number or letter next to the power terminals.

Shipping breaks: Provide terminal blocks for interconnecting wiring on each side of shipping breaks. Marking: Number terminals individually to match as-built drawings. Identification: Identify cables at both ends using neat ring-type ferrules. Cable Lugs Make bolted cable connections using tinned copper lugs, crimped to the cable end with the correct tool and setting such that the lug and cable end from a homogeneous mass. Connect bolted cable connections to switchgear terminals using high tensile bolts, heavy gauge mild steel washers, full nuts and locknuts. Use passivated cadmium plated hardware for all cable terminations. Fit the cable lugs and termination hardware to the switchgear prior to delivery to site.

8.15

Measurement Accessories

8.15.1

Digital Power Analysers

Display the following parameters as a minimum:

    

Phase to neutral voltage Phase current Phase to phase voltage Maximum demand Actual/ neutral current

Maximum demand: integration calculation, which displays the average demand over a 15-minute period. Instruments which only display instantaneous highest recorded demands are not acceptable. Programmable to enable set up of current transformer ratios and voltages so that actual values can be displayed without scaling factors. Password protected. Log sags and swells.

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High level interface to a BMCS or similar, the meter shall also display the following parameters:

    

Frequency Power Factor Active Power Reactive Power Total harmonic distortion up to 31st components.

Interface: RS485 Modbus protocol. 8.15.2

Current Transformers (Metering)

Application Provide separate transformers for measurement and protection. Test Links Provide test links for connection of calibration instruments and meters and for shorting of current transformer secondaries. Provide energy meters, maximum demand meters, ammeters and protection relays, with sets of rail-mounted links consisting of screw-clamped slide links and an earth link, or proprietary plug blocks Test Studs For energy and demand meters provide rail-mounted potential test studs or plug connections next to associated current transformer links. Provide at least one set of test studs for each compartment. Accuracy Classification Energy measurements: Class 1.0M. Indicating instruments: Class 2.0M. Ratings Rated short time current: At least the short time withstand current equivalent of the circuit in which the transformer is installed. Rated primary current: At least equal to the current rating of the functional unit. Secondary windings: Rated at 5 A, burden of 0.4 ohm (10 VA) with star point earthed. Type If practicable, use cast resin encapsulated window-type with busbar clamping devices. Otherwise use wound-primary type with mounting feet. Installation General: Install transformers to permit easy removal. Removable links: Provide removable links of minimum lengths for transformers fitted on busbar systems. 8.15.3

Instruments and Meters

Construction Indicating and recording instruments: Provide damped movements and impact resistant glass cover. Provide for external adjustment of the zero. Support moving elements of indicating instruments between shock resistant jewel bearings. Transducers: Totally enclose in flame-retardant, rail-mounted moulded cases.

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Minimum degree of protection: IP52. Meter Scales Direct reading analogue type with black lettering on white background with black pointer or digital type with liquid crystal display, capable of indicating the maximum value of the measured variable. Transducers If necessary for transducer operation, provide auxiliary supply. Connect outputs to dedicated railmounted isolating type terminals. Accuracy Indicating instruments and accessories: Accuracy class 1.5 or lower class index number except Class 3 for thermal maximum demand indicators. Electricity meters: Class 0.5. Power factor meters, phase angle meters and synchroscopes: 2 electrical degrees maximum error. Transducers: Class 0.5. Accessories General: Mount next to associated instruments, inside cabinets. Power distribution assemblies: Provide meters of the same style and size, with bezel minimum 96 x 96mm and 90 quadrant scale. Mounting Flush mount meters on hinged panels. Wire with multi stranded flexible cables. Protection Devices Meter potential protection devices: Group together behind associated meter cover or hinged door, preferably next to current transformer test links. Labels If associated exclusively with one phase, label meters "BROWN", "BLACK", or "GREY" as applicable. Ammeters Type: Analogue or digital. Overscale: For ammeters subject to motor starting currents, overscale to at least 5 x full load current. Selector switches: 4-position type with positions designated "Br/B/Gr/OFF". Mount under or next to relevant ammeters. Voltmeters Type: Analogue or digital. Selector switches: 7-position voltage transfer type for measurement of phase-to-phase and phase-toneutral voltages with off. Mount beneath relevant voltmeters. Kilowatt Hour Meters Digital type, for CT operation for loads over 63A otherwise direct connection. Maximum Demand Indicators General: Provide a meter in each phase with 15 minute response time. Provide for sealing the reset mechanism. Provide a combination 3 point indicator consisting of an instantaneous red ammeter pointer, a red maximum demand slave pointer with external reset facility, and a white maximum demand pointer. Instantaneous type: Combined type with bi-metal maximum demand ammeter element and moving iron instantaneous ammeter element.

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Thermal type: Combined type with bi-metal maximum demand ammeter element. Accuracy class Instantaneous: Class 1.5. Maximum demand: Class 3. Wattmeters and Varmeters Suitable for unbalanced 3 phase, 4 wire loads. Connect to measurement transducers. Hours-run Meters 6 digit (minimum) dial with last digit read-out in 0.1 hour increments. Scale: Horizontal linear digits. Watthour meters Type: Rotating element induction disc type or electronic type. 3 phase metering: Poly-phase meters suitable for unbalanced 3 phase, 4 wire loads. 1 or 2 phase metering: Single phase meters. Current rating: To suit load and overload conditions. Provide direct connect meters suitable for current range of 15 – 100 A and meters with current transformers suitable to 5 A secondary. Register: Provide a direct reading register of the large figure type. Mark on the scale the metering transformer ratios and the multiplying factor applied to the meter constant. Covers: Seal main covers. Frequency meters Type: Either analogue or digital type, or vibrating reed type with 7 reeds. Analogue type: Graduated in 0.1 Hz increments. Scales:

 

Analogue: Graduated 45/65 Hz. Vibrating reed: Horizontal reed bar graduated 47/53 Hz.

Synchroscopes General: Continuously rated, rotating vane type movement, with spring loaded bearings and silicon fluid dampening, positive and negative arrows, black pointer and 12 o’clock marking. Scales: 360°. Phase angle meters General: Provide for 3 phase, 4 wire unbalanced loads. Scales: 0.5 leading to 0.5 lagging. 8.15.4

Indicator Lights

Degree of Protection At least that of the assembly/operating face. Type Domed glass or heat resistant plastic lens and chrome bezel. Performance



Rated lamp life 20,000 hours.

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 

Indication clearly visible from side or front at 15 metres in normally illuminated plantroom. All colours to have equal brightness.

Neon Indicators 230V, 12mm diameter with in-built resistor. LED Indicators 12 or 24V, nominal 25 mm diameter. Clustered LED’s: Encapsulated with current limiting resistors and voltage regulators. LED indicators shall fail to open circuit. Lamp Test Facility Provide individual push-to-test or common test circuit. Spares Provide 3 spare lamps and one lamp extractor. Mount on clips in spares cabinet.

8.16

Switchgear Accessories

8.16.1

Circuit Breaker Integral Protective Relays

General Provide integral protective relays which provide for tripping in the event of relay operation, and for manually resetting. Provide operation indicators with a set of change over voltage free alarm contacts, for connection to an alarm circuit wired to terminals. Mounting Integral type: Readily accessible for viewing and adjustment with doors and covers in position. External type: Flush. 8.16.2

Residual Current Devices

Integral Type General: Where shown incorporate earth leakage in circuit breaker protection operation. Mounting: Comply with moulded case and miniature circuit breakers, in the circuit breakers subsection. Tripping Residual current classification: Type II. Maximum tripping current: 30 mA.

8.17

Current Transformers (Protection)

Type Cast resin encapsulated window type with busbar clamping devices. Rated Short Time Current At least the short time current equivalent to the assembly fault level. Rated Short-time At least the maximum time setting of the related protective relay. Minimum 1 s. Rated Primary Current Equal to assign current rating of the associated functional unit.

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Rated Secondary Current 1 A. Connect star point to earth. Interposing Transformers As recommended by the protective relay manufacturer. Saturation 10-15x full load current, Class 10P. Characteristics As recommended by the protective relay manufacturer. Provide adjustment facilities to allow matching. Test Links Provide test terminals and current transformer secondary shorting links in accessible positions within instrument panels. Provide a set of DIN-type rail mounted test links, consisting of screw clamped slide links and earth links or proprietary plug blocks, for each current transformer group. Installation General: Install transformers to permit easy removal. Removable links: Provide removable links of minimum lengths for transformers fitted on busbar systems. Markings: Mount transformers in the assembly enclosure, so that polarity markings and nameplate details are readily viewed right side up without removing the transformers.

8.18

Ancillary Equipment

8.18.1

Batteries And Chargers

General Provide a battery and charger system for circuit breaker tripping, closing and automatic changeover switch operation. Locate within the switchroom. Circuit Breaker Operation Provide a D.C. supply for circuit breaker operation from battery system and charger. Performance General: Capable of 10 consecutive air-circuit breaker or moulded case circuit breaker operations for the designated quantity of circuit breakers. Each operation consists of open-close of main contacts for 0.5 s duration, with 1 s intervals between operations, and minimum discharge current of 4 A, with batteries in 50% discharge condition. Maintain a minimum terminal voltage of 80% of rated voltage at the completion of the 10 operations. System voltage: 110 V d.c. Battery Chargers Type: Free standing, floor mounted, ventilated cabinet type with separate charger and battery subsections. Degree of protection: IP42. Tapping: Provide tappings on the transformer to permit adjustment over a range of 95% - 105% of secondary winding voltage on open circuit. Circuitry: Solid state, micro-processor type, constant voltage, fully automatic, incorporating a smoothing network to give an output wave form at least as smooth as that of a 3 ¬phase bridge system, and automatic boost and float charge functions adequate to ensure maximum battery life and rated performance. Provide facilities for manual boost and test.

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Maximum design transient: 70% of the component manufacturer's peak inverse ratings. Instruments, controls and indicators: Group for ease of operation. Provide analogue or digital instruments for the following:

  

Charger output current. System voltage. Load current.

A.C. input protection: Miniature circuit breakers. Protect outgoing tripping supply using 2 pole D.C. miniature circuit breaker. Provide alarm indication to monitor the following:



A.C. supply.

Boost charge on. Charge fail. Low battery voltage. High battery voltage. Low electrolyte for vented cells. Earth fault, secondary side. Safety Signs And Labels Safety signs: Provide cautionary, regulatory and emergency safety signs to charger enclosure and switchroom. 8.18.2

Anti-Condensation Heaters

General Rating: Provide heaters rated at not less than 20 W/m2 of total external area including top of weatherproof enclosure. Type: Black heat type which may be touched without injury, mechanically protected and thermostatically controlled. 8.18.3

Tools And Spares Cabinet

General General: Provide a spares cabinet with nameplate, labelled shelves and non-lockable door. To accommodate racking handles, special tools, spare lamps, spare fuse links and other equipment necessary for operation of the assembly. Location: Either

 

incorporated into assembly enclosure; or wall mounted in main switchroom.

Finish: To match assembly.

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8.19

Installation

8.19.1

Assembly Installation

Fixing Before making interpanel connections, fix assemblies and metering equipment enclosures into position, level and plumb. Floor mounted assemblies: Secure to structural floor with masonry anchors. Shim to level and seal air gaps with epoxy. 8.19.2

Assembly Entries

Cable Entries General: Neatly adapt one or more cable entry plates, if fitted, to accept incoming cable enclosure. Use the minimum number of entry plates to leave spare capacity for future cable entries. Do not run cables into the top of weatherproof assemblies. Single core cables rated > 300 A: Pass separately through non-ferrous gland plates. Do not use metal saddles. Cable Enclosures Continue cable enclosures to or into assemblies and fit cable entry plates so that the IP rating of the assembly and the fire rating of the cable are maintained. Cable Supports Support or tie mains and submains cables within 200 mm of terminations. Provide cable supports suitable for stresses resulting from short circuit conditions. Bus Trunking System Entry Provide entry plates with close tolerance cut-out to accommodate busbars, fitted with a flange bolted and sealed to assembly enclosure to maintain assembly IP rating. Earth busway enclosure to assembly protective earth conductor. Fit busway flanges at assembly manufacturer's premises and retain for transportation.

8.20

Marking

8.20.1

General

Provide labels including circuit numbers and equipment functions, functional units, notices for operation and maintenance personnel, incoming and outgoing circuit rating, sizes and origin of supply and kW ratings where applicable. 8.20.2

Identifying Labels

Provide labels fixed to escutcheon panels and internal equipment and adjacent to access panels, doors, and covers, indicating the relevant section and component. 8.20.3

Labels On Assembly Exteriors

Manufacturer's name: Required. Assemblies: Label with switchboard designation. 8.20.4

Minimum Lettering Heights

Refer “General Services Requirements” section. Designation labels: For other than main assemblies, provide designation label stating source of electrical supply. Identify separate sections of enclosures.

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Assembly controls: Label controls and fault current limiters, including the following:

   

Circuit designation for main switches, main controls and sub-mains controls. Details of sub-mains. Incoming busbar or cable rating to first tee-off. Fuse link size.

8.20.5

Labels On Assembly Interiors

General: Provide labels for equipment within assemblies. Locate so that it is clear which equipment is referred to, and lettering is not obscured by equipment or wiring. Moulded case circuit breakers: If circuit breaker manufacturer's markings are obscured by operating handle mechanisms or motor operators, provide additional markings open to view on or next to the circuit breaker. 8.20.6

Danger, Warning and Caution Notices

Busbars: If polymer membrane coating is used without further insulation, provide warning notices on the front cover near the main switch or local main switch, and on rear covers, indicating that busbars are not insulated. “Danger-Live Bars Behind”. Fault current limiters: In assembly sections containing fault current limiter fuses provide caution notices fixed next to the fault current limiters, stating that replacement fuse links are to match as-installed fuse link ratings, make and characteristics. Provide separate label stating fault current limiting fuse ratings. Externally controlled equipment: To prevent accidental contact with live parts, provide warning notices for equipment on assemblies not isolated by main switch or local main switch. Stand-by power: Provide warning notices stating that assemblies may be energised from the stand-by supply at any time. Anti-condensation heaters: To prevent accidental switching off, provide caution notices for anticondensation heaters. Custom-built assemblies: For insulation or shrouding requiring removal during normal assembly maintenance, provide danger notices with appropriate wording for replacement of insulation shrouding before re-energising assemblies. Positioning: Locate notices so that they can be readily seen, next to or, if impracticable, on busbar chamber covers of functional units, and behind the front cover of functional units. Provide circuit identification labels in the cabling chamber of each functional unit, located next to external terminations. 8.20.7

Circuit Schedule

Schedule Cards General: For distribution assemblies, provide schedule cards of minimum size 200 x 150 mm, with typewritten text showing the following as-installed information:

 

Sub-main designation, rating and short-circuit protective device. Circuit numbers and current ratings, cable sizes and type and areas supplied.

Mounting: Mount schedule cards in a holder fixed to the inside of the assembly or cupboard door, next to the distribution circuit switches. Protect with hard plastic transparent covers. Single-Line Diagrams Custom-built assemblies: Provide single-line diagrams.

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Format: Non-fading print, at least A3 size, showing the as-installed situation. Mounting: Enclose in a non-reflective glazed metal frame and wall mount close to assembly.

8.21

Completion

8.21.1

Training

Programmable Logic Controllers Provide one programmer and submit associated instruction manual 5 days before start of operator training. Tools Provide one set of racking tools for circuit breakers, and special installation, operation and servicing tools.

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AUTOMATIC TRANSFER SWITCHES

9.1

Ouble run busbar trunking busway system incorporating là gì năm 2024

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