2014.11.23_electrical specifications combined_tender submission

7/21/2019 2014.11.23_Electrical Specifications Combined_Tender Submission

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DOCUMENT VOLUME 02.08

ELECTRICAL SPECIFICATIONSA049_RSP_EL_SPC_0001_T0

NOVEMBER 23, 2014


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Project: DMS No 139305Palm Jumeirah Construction of the West Beach Club,THE WEST BEACH CLUB,

Works: G+1 STOREY PALM JUMEIRAH, DUBAI, UAE

Title: DOCUMENT INDEX

DOCUMENTS INDEX

VOLUME 01 Tendering & Contract Conditions

VOLUME 02 Specifications

Volume 02.01 General Specifications Architecture & Interior Design

Volume 02.02 Interior Design Schedules

Volume 02.03 Civil & Structural Specifications

Volume 02.04 Sustainability Specifications

Volume 02.05 Fire Specifications

Volume 02.06 Plumbing Specifications

Volume 02.07 HVAC Specifications

Volume 02.08 Electrical Specifications

Volume 02.09 Specialist Lighting Specifications

Volume 02.10 Signage Specifications

Volume 02.11 Faade Specifications


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Project: DMS No 139305 Palm Jumeirah Construction of the West Beach Club,THE WEST BEACH CLUB,

Works: G+1 STOREY PALM JUMEIRAH, DUBAI, UAETitle: DOCUMENT VOLUME 02.08

ELECTRICAL SPECIFICATIONS

DOCUMENT VOLUME 02.08

ELECTRICAL SPECIFICATIONS

TABLE OF CONTENTS

DIVISION08 ELECTRICAL SPECIFICATIONS

SECTION260001 -PARTICULARSPECIFCATIONSECTION260500-GENERALREQUIREMENTSELECTRICAL

SECTION260519 -LOW-VOLTAGEELECTRICALPOWERCONDUCTORSANDCABLES

SECTION260526-GROUNDINGANDBONDINGFORELECTRICALSYSTEMS

SECTION260533-CONTAINMENTFORELECTRICALSYSTEMS

SECTION260536-CABLETRAYSFORELECTRICALSYSTEMS

SECTION260923 -LIGHTINGCONTROLDEVICES

SECTION262300 -LOW-VOLTAGESWITCHGEAR


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Title: DOCUMENT VOLUME 02.08ELECTRICAL SPECIFICATIONS

SECTION 260001 PARTICULAR SPECIFCATION

PART 1 - INTRODUCTION

A. The scope of this document is relevant to the design work included in the electrical engineers

scope of work which in summary includes the following:

- Power distribution

- Small power

- Lighting and Controls

-Fire Alarm systems

- Emergency lighting systems

- Lightning protection

- Earthing

-

IT

- Security systems

h h ll f h l k f d d f d l


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- DEWA Wiring Regulations

- DEWA Substation Standards

- Dubai Civil Defence

- Dubai Police

- EHS

- Trakhees

- Nakheel

- IET Wiring Regulations, BS 7671

- BS 7430

- BS EN 62305

- BS EN 60439 and IEC 439

- BS 88, BS 60898, BS 60269-2

- NFPA 70

- NFPA 72


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B. In addition to the below systems, the following scope of works is to be carried out by the MEP

Contractor.

- All the Electrical Works listed below.

- All necessary coordination with other trades to ensure the electrical works is implemented safely

and correctly.

- Liaising with local authorities for all submittals and approvals.

- Ensure the design meets the criteria for EHS accreditation.

- All plant exposed to the elements shall be corrosion resistant to withstand the sea air environment.

C. The following, including but not limited to, are the major electrical services which form part of thispackage:

3.2 MEDIUM VOLTAGE POWER

A. The medium voltage power i.e. 11kV includes ring main units and transformers and the

interconnecting cabling. The tendering contractor shall ensure that they include all the necessary

requirements for the installation of the medium voltage systems. The DEWA regulations andagreements in terms of scope in this context are often subject to discussion and the contractor

shall ensure that they have undertaken the necessary due diligence before they submit their priceto ensure all necessary costs are included A clear defined scope between DEWA and the


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- Testing, commissioning of a complete low voltage distribution system with full documentation of all

approved material submittals and test certificates

3.4 STANDBY ELECTRICAL POWER

A. The contractor shall be responsible for the complete delivery of the standby electrical power

distribution systems included but not limited to the following.

B. Generator sets

C. Generator fuel system, anti-vibration, acoustic treatment etc.

D. Rack Mounted UPS

E. Testing, commissioning of a complete standby power system with full documentation of allapproved material submittals and test certificates

3.5 CABLES AND PATHWAYS

A. The contractor shall be responsible for the complete delivery of the cabling and pathways,

including but not limited to the following.

- Power cabling

- Fire alarm cabling


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- Power supplies to all fixed equipments

- Power supplies to all IT, AV and Security systems

- Power supplies to all pool equipment

- Power supplies to all signage

- Power supplies to all elevators

- Power supplies to all other equipment as illustrated on the drawings

- Testing, commissioning of a complete small power system with full documentation of all approved

material submittals and test certificates

B. For bespoke systems requiring specialist input from contractors suppliers such as fire alarmsystems, central battery, lighting controls, ELV systems the contractor shall ensure that all power

supplies are accounted for in their price.

3.7 LIGHTING INSTALLATIONS

A. The contractor shall be responsible for the complete delivery of the lighting systems included but

not limited to the following.

- Lighting fixtures


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- Emergency lighting power distribution

- Testing, commissioning of a complete emergency lighting system with full documentation of all

approved material submittals and test certificates

3.9 LIGHTNING PROTECTION AND EARTHING

A. The contractor shall be responsible for the complete delivery of the lightning protection and

earthing systems included but not limited to the following.

- Full implementation of lightning protection system

- Full implementation of building earthing systems

-Testing, commissioning of a complete lightning protection and earthing systems with fulldocumentation of all approved material submittals and test certificates

3.10 FIRE ALARM & DETECTION AND VOICE EVACUATION SYSTEMS

A. The contractor shall be responsible for the complete delivery of the fire alarm systems included but

not limited to the following.

- Fire detection devices

- Fire alarm panels


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PART 4 - ELECTRICAL POWER

4.1 SUPPLY INTAKE

A. There is one substation proposed for the development which will consist of 2No. Ring

Main Units (RMU) and 3No. Transformers.

B. The transformer rooms shall be dry type cast resin 11,000/400V step down transformers

rated at 1500kVA. The incoming 11kV cables from the RMU rooms shall be distributed

through cable trenches where they shall be terminated into the transformer gland box

from below.

C. During the tendering process the MEP contractor shall discuss the project with DEWA and

finalise their scope with the respect to the items in the table below. Based on the

engineers discussions with DEWA during the design, the responsibility with respect tothese major items are as indicated. The MEP contractor shall ensure that this is

revalidated with DEWA and they encompass any other scope items as required by

DEWA in their tender.

D. It shall be the contractors responsibility to submit and obtain all approvals from DEWA,

coordinate with local authorities and the master planner.

4.2 LOW VOLTAGE POWER DISTRIBUTION

A Th t t h ll d i i t ll t t d i i l t l lt


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- Harmonic filters

- Metering

- Transient over voltage protection

B. It shall be the contractors responsibility to engage a specialist LV equipment supplier.They in turn shall provide a complete design detailing full schematic distribution, panel

sizes and details and all components to facilitate the safe distribution of power. The final

design and configuration shall be subject to the manufacturers equipment specification,

capabilities and arrangements. The contractor shall ensure that they include for the full

system in their tender.

C. The contractor must carry out a full discrimination and cascading study based on their

selected switchgear manufacturer prior to ordering/procuring the switchgear.

4.3 LV SWITCHGEAR

A. The main distribution boards, typically referred to as MDBs, shall be located in the main

LV switch room adjacent to the transformer room. There shall be one MDB per

11,000/400V transformer. The primary purpose of the MDBs is in the control and safe

distribution of 400V power to sub main power distribution networks and equipmentthroughout the development.

B M i it h l h ll b i it h b d di t ib ti it h i l


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F. The MEP contractor shall source the LV distribution panels from a single manufacturer.

G. The contractor must carry out a full discrimination and cascading study based on their

selected switchgear manufacturer prior to ordering/procuring the switchgear.

4.4 POWER QUALITY

A. The overall power factor of the installations shall be maintained within 0.93 (lagging)

and unity by the use of centralized capacitor banks.

B. All light fittings with discharge lamps, mercury /sodium vapor, fluorescent tubes etc shall

incorporate capacitors to obtain a power factor of 0.9 or above, lagging.

C. Power factor equipment shall be provided to suit the total power requirement of thebuildings. This shall be achieved using capacitor equipment housed within dedicated

enclosures and located adjacent to the main electrical switch panel for each building.

D. Capacitor banks shall be organized in groups of switched multi bank stages so the

power factor compensation can be varied to suit the behavior of the load which may

occur at different times of days. Final sizing of capacitor banks shall be subject to DEWA

approval.

E. Provision shall be made in the various panels/switch rooms for the introduction of active

harmonic filtering equipment. The MEP contractor shall utilize their specialist switchgear

supplier to provide a complete harmonic review of the development and provided the


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B. The incomer ACB on each MDB shall be equipped with a multifunction meter with a

pulsed kWh output to be connected to the BMS system for monitoring only. The following

parameters shall be monitored.

1. Instantaneous line and phase voltage

2. Instantaneous line and phase currents

3. Power factor

4. Frequency

5. Instantaneous line and peak active power

6. Instantaneous line and peak reactive power

7. Instantaneous line and peak apparent power

8. Total consumed active energy

9. Total consumed reactive energy

10. Total consumed apparent power

11. % Harmonic content


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distribution of services electrical risers are provided to accommodate the sub main

distribution components including cable trays, sub main distribution boards and final

circuit distribution boards.

4.7 POWER TO MECHANICAL PLANT

A. Mechanical services consists of:

- Chilled water pumps

- Sumps pumps

- Fire pump

-Water and drainage pumps

- Air conditioning units

- Irrigation pumps

- Swimming pool plant

-

Elevators

B. Please refer to the mechanical engineers drawings, specification and schedules detailing

the plant requirements.


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4. Status of all automatic transfer switches will be monitored.

5. Lighting controls

6. Automatic transfer switches

7. Central battery system.

8. Security management system

9. Elevators

10. The generator control panel shall be interfaced with the BMS and all measurable

parameters and systems status shall be viewable from a central PC located in the fire

command centers.

11. The UPS control panel shall be interfaced with the BMS and all measurable

parameters and systems status shall be viewable from a central PC located in the fire

command centers.

PART 5 - STANDBY POWER


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F. The contractor shall design procure install, test and commission a complete standby power

installation in accordance with DEWA, BS7671 requirements, the design drawings and in

accordance with the specifications. This shall include but not be limited to the following:

- Standby generator

- Generator fuel system

- Generator anti vibration mounts

- Generator acoustic treatment

- Generator controls

G. It shall be the contractors responsibility to engage a specialist standby power equipment supplier.

They in turn shall provide a complete design detailing full schematic distribution, panel sizes anddetails and all components to facilitate the safe distribution of power. The final design and

configuration shall be subject to the manufacturers equipment specification, capabilities and

arrangements. The contractor shall ensure that they include for the full system in their tender.

- Fire alarm and voice evacuation systems

- CCTV systems

- Telecommunication systems

- Emergency lighting (central battery system)


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PART 6 - CONTAINMENT AND WIRING

6.1 CONTAINMENT

A. The containment systems developed by the engineer is design intent only and details primary and

secondary containment routes only.

B. The design intent details only tray, ladder and trunking. No conduits are detailed on the design

drawings.

C. The following containments are proposed for the various systems as follows:

- Main and sub main power systems : Cable Tray/Ladder

-Lighting circuits : Trunking

- Final power circuits : Trunking

- ELV systems : Cable tray

- Fire alarm systems : Trunking (horizontal risers)

-

Emergency lighting circuits : Trunking (horizontal)

D. Should the contractor wish to propose alternatives in certain instances this shall be acceptable

subject to review.


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H. Heavy duty GI conduits shall be used for surface installations in plant rooms and all locations

external to the building where the conduit cannot be buried into the building fabric or concealed

securely within the building cladding. Generally, where plastered walls are available, conduits

should be concealed within.

I. Trunking shall be provided where there are a number of multiple circuit cables to be run.

Generally where four or more circuits are to be run in a common route, then the contractor shall

provide a galvanized steel trunking system in place of conduit. This provides a neater more easily

identifiable installation rather than running multiple runs of conduits.

6.2 POWER CABLES

A. The power cables to be installed throughout the building shall be LSF Low Smoke and Fume (or

LSOH Low Smoke Zero Halogen) outer sheath type. This follows the norm in Europe to minimise

build-up of poisonous fumes in the event of fire in highly populated or residential buildings.

B. Sub-main cables shall be XLPE/SWA/LSF type whilst final circuits shall generally be LSF sheathed

single core cables.

C. Where cables are buried externally for example those which serve external feeder pillars,

lighting, pumps or otherwise the cable specification can be PVC as opposed to LSF.

6.3 FIRE-RATED CABLES

A As per NFPA and local Civil Defence requirements the following systems shall be wired in fire


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PART 7 - SMALL POWER SYSTEMS

7.1 WIRING ACCESSORIES

A. Wiring accessories shall include but not be limited to the following:

-Sockets

- Fused connection units (switched/unswitched)

- Flex outlets

- Double pole switches (for lighting and power)

-Industrial sockets

B. The contractor is to ensure the following is included within their design:

- All sockets shall be switched type

- All fused connection units, switched or un switched shall have red indication lamps

- Fused connection units serving essential equipment such as fire detection and alarm panels, fire

suppression control panels, access control panels etc shall be un switched type.

C. Setting out of wiring devices shall be undertaken by the contractor in accordance with the


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E. The Ingress Protection (IP) rating of wiring accessories shall be subject to location, the particular

requirements are outlined below:

F. Unless indicated otherwise on the contract drawings or described otherwise in this specification

all wiring devices in internal areas shall be standard as would normally find in interior non-

hazardous environments.

-IP 67 shall be utlised for all external wiring accessories

- IP 65 shall be utilized in mechanical plant rooms

- IP 65 shall be utilized in electrical switch rooms, including main and essential LV rooms,

transformer room and generator room.

7.2 SPECIALIST SYSTEMS

A. There are a number of specialist systems on this project which the engineers drawings interface

with. This section outlines these systems and defines what details the engineering drawings

encompass. All other details shall be as per the specialist designers drawings and specifications.

B. The engineering drawings cover the Irrigation package as follows:

-Power supply to irrigation pump rooms rated to suit the load and location noted by irrigationspecialist.

C The engineering drawings cover the swimming pool equipment package as follows:


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- Store rooms

- Offices

- Stairs

B. The contractor shall be responsible for the supply, installation and testing of the lighting systems

and ensuring the energy efficiency criteria are implemented.

C. The setting out of luminaires shall be as per the interior designer and architects reflected ceiling

drawings and elevations. For areas not detailed such as plant rooms the contractor shall refer to

the engineers detailed drawings and apply good engineering and installation practice. It is

essential that the installation follows the design intent.

8.2 LIGHTING CONTROLS

A. This contract is to include for the supply, installation, test and commissioning of the lighting control

system for the complete lighting design. A description of the system requirements is outlined

below.

B. All Front of House lighting shall be DALI dimmable. The scene setting, zoning and grouping of

fixtures will be done during commissioning with the lighting control manufacturer representative

on site prior handover.

C. Lighting controls shall be generally provided as follows:


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- Presence detector control (sensors)

I. Facade

- Astronomical Clock

J. Atrium/Lobby

- Astronomical Clock

K. Toilets/Lockers

- Presence detector control (sensors)

PART 9 - EMERGENCY LIGHTING

A. The contractor shall design; procure install, test and commission a complete emergency lighting

system in accordance with local Civil Defence requirements, NFPA, the design drawings and in

accordance with the specifications.

B. It shall be the contractors responsibility to engage a specialist emergency lighting supplier. They

in turn shall provide a complete design detailing full schematic distribution, battery sizes, panels

sizes and quantities, monitoring modules, switching modules etc. The final design andconfiguration shall be subject to the manufacturers equipment specification, capabilities and

arrangements. The contractor shall ensure that they include for the full system in their tender.


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G. The contractor shall refer to the architect and interior designers drawings for the setting out of

emergency lighting. Where such drawings are unavailable such as plant rooms etc the contractor

shall implement good engineering and installation practice.

H. The emergency lighting system shall be fully interfaced to the BMS for monitoring.

PART 10 - FIRE AND LIFE SAFETY SYSTEMS

10.1 GENERAL

A. The contractor shall design, procure, install, test and commission a complete fire alarm and

detection and voice evacuation system in accordance with the local Civil defence, NFPA

regulations, and design drawings and in accordance with the specifications.

B. It shall be the contractors responsibility to engage a specialist fire alarm and detection system

supplier. They in turn shall provide a complete design detailing full schematic distribution, battery

sizes, panels sizes and quantities, monitoring modules, switching zoning, cabling arrangements

etc. The final design and configuration shall be subject to the manufacturers equipment

specification, capabilities and arrangements. The design is intent only. The contractor shall ensure

that they include for the full system in their tender.

C. Please note the setting out of visible fire alarm devices shall be as per the architect and interiordesigner coordinated RCPs and setting out elevations. For plant rooms and other areas the

installation shall be as per the typical detail drawings shown and in accordance with good

i i d i t ll ti ti


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D. Additionally fire alarm repeater panels shall be located at alternative entrance points. The fire

alarm panels shall be networked together using fire rated cable.

E. In accordance with NFPA requirements and local Civil defence requirements, ceiling voids shall

be provided with point type smoke detection. The contractor shall allow for ceiling mounted

indicators for the point type smoke detector above unless agreed otherwise with the local civil

defence.

F. The contractor shall ensure that the fire alarm system is fully interfaced with the following systems:

- Fire pump control panels

- General extract system control panels

- Air handling unit control panels

- Pumping system control panels

- Elevators

- Clean agent fire suppression systems

- Gas solenoid valves

- Lighting control panels

- Motorised fire dampers


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J. The specialist system supplier shall undertake calculations to verify all speaker quantities and

spacings.

K. All fire detection loops and voice alarm channels shall be wired using multi-core LSF/LSOH fire

rated cable (coloured red) installed on galvanized cable tray, secured direct to the building fabric

and installed with PVC conduits recessed into the building fabric.

10.3 FIRE BARRIERS

A. Fire barriers shall be provided for all service penetrations to maintain the fire-rating of walls,

floors, partitions, ceilings etc. This shall be coordinated closely with the main contractor who shall

close builders work openings to a 75mm perimeter around electrical service openings. The

remaining opening shall be fire-sealed by the MEP Contractor.

B. In riser closet floors for ELV and mains power risers, floors shall be fire-sealed to provide two hourfire ratings.

C. For fill details on compartment fire ratings please refer to the fire engineering drawings.

10.4 DISABLED TOILET

A. The disabled toilet alarm system shall consist of the following key components:

- Zone controller supporting up to four zones or as per manufacturers capability.


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B. The drawings provided as part of the detailed design are design intent. Final arrangements and

system configuration shall be as per the recommendation of the specialist system supplier. MEP

contractor shall provide all power supplies, containments, components, interfaces to facilitate a

fully functional system.

C. The disabled toilet alarm systems shall be connected to the BMS and monitored in the central

security room. Upon activation an alarm notification shall be raised in the security room. This can

be a separate alarm panel or it can be integrated over the TCP/IP network and the alarm can be

displayed over a PC or the security monitoring wall.

10.5 BMS INTERFACING

A. The fire alarm and voice evacuation system, along with the disabled toilet alarm system shall be

interfaced to the BMS for monitoring.

PART 11 - EARTHING AND LIGHTNING PROTECTION

11.1 EARTHING

A. Electrical earthing and equipotential bonding systems shall be designed in accordance with

DEWA requirements, telecom provider requirements, BS 7430 and BS 7671.

B. The main electrical earthing systems shall consist of a consumer provided earthing system and anearthing system provided by DEWA This is most common form of arrangement in Dubai that is


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F. Substation LV Earthing

- 2 No. earth pits for each main distribution board

- 2 No. earth pits for each main essential distribution board. Secondary essential LV panels shall be

bonded to the main essential distribution board earth bar.

-2 no. earth pits for each generator.

G. Clean Earths

- Dedicated earth pits for telecom intake rooms, one earth pit for DC earthing and one earth pit for

AC earthing.

- 2 No. dedicated earth pits for the main distribution frame room

- 2 No. dedicated earth bars for main IT room

H. These earth bars shall be exclusively used for earthing and equipotential bonding of the

telecommunications equipment located within these spaces. This shall include but not be limited

to:-active and passive equipment cabinets, comms room air conditioning units, raised floor

pedestals, containment etc.

I. Earth rods, typically consisting of 15mm copper, shall be driven into the subsoil and a cast ofapproximately 250x250mm shall be made in the slab for the insertion of the earth electrode

inspection pits.


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additional/modifications requirements without fundamentally changing the proposed earthing

system.

11.2 LIGHTNING PROTECTION

A. The lightning protection system shall be fully in accordance with the requirements of BS EN

62305.

B. During the design the contractormust engage a lightning protection specialist to undertake a risk

assessment of the kindergarten and primary/secondary building with the following classifications

noted.

- West Beach Club LPS Class I

C. The contractor shall submit for approval a lightning protection study and method statement fromtheir chosen specialist for approval by the engineer.

D. To save cost and in the interest of more sustainable site installation solutions the lightning

protection system shall utilize as far as possible the natural components of the building.

E. The down conductors shall be located around the periphery of the building as far as is reasonably

possible. Reinforcement bars in the designated columns shall be used as down conductors. A

minimum of 2no. rebars in each designated column shall be used from top to bottom. To ensureelectrical continuity of the rebar the overlap shall be equal to 20 times the diameter of the rebar

and the overlap shall be secured using either proprietary U clamp fixings or welds.


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J. As per DEWA requirements the building earth pits and the lightning protection earth pits shall be

separated by 6.0m.

K. The contractor shall allow for surge protection in accordance with the recommendation of their

specialist system supplier and as outlined in this specification. As a minimum surge arrestors shall

be provided for the following:

-All main distribution boards

- Sub main boards feeding external feeder pillars

- Sub main boards serving external services i.e. plant and lighting.

L. If the motor control center is fed from an SMDB then the surge protection in the SMDB shall be

sufficient.

M. The contractor when tendering for this project shall ensure they have a full understanding of the

requirements of the lightning protection system and what is required of their specialist system

supplier. They shall ensure that they include all costs in their tender.

PART 12 - SECURITY PROTECTION

12.1 GENERAL

A This contract is to include for the supply detailed design and installation of the CCTV system described


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SECTION 260500 GENERAL REQUIREMENTS ELECTRICAL

PART 1 - CONTRACTORS SCOPE OF WORK

A. The Contractor is required to :

B. Carry out the building services installations described on the Contract Drawings and in full

compliance with the requirements of this Specification.

C. Select material and equipment suitable for the duties detailed on the Contract Drawings and in the

Specification.

D. Select material and equipment as described on the drawings and within the specification and

from the list of manufacturers within the specification.

E. Carry out the detailed design as necessary for each of the Building Services installations.

F. Co-ordinate all aspects of the Building Services installation and its designs such as Structure,

Architecture, ID, Specialist requirements and Local Authorities requirements.

G. Co-ordinate the Building Services installations with all building services plant and equipment

manufacturers details.

H. Co-ordinate the Building Services installation with all other building details.


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L. Test, Commission and set to work each of the systems of the Building Services installation in

accordance with this specification.

M. Demonstrate the working system and the testing and commissioning of same to the clients

representative.

N. Provide suitable training to client personnel for each of the Building Services Systems.Power

distribution.

PART 2 - DEFINITIONS AND ABBREVIATIONS

A. Engineer Appointed Engineer

B. 'Comment' - comment in writing by the Engineer.

C. 'Approval' (and words derived there from) approval in writing by the Engineer.

D. 'High Voltage' (HV) - 11000 volts between phases.

E. 'Low Voltage' (LV) - 400 volts between phases and 230 volts phase-to-neutral.

F. 'Extra Low Voltage' (ELV) - below 50 volts.

G. IEE Institution of Electrical Engineers.

H. BS - British Standard Specification.


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R. UL Underwriters Laboratory

S. External Area Non-air conditioned area

PART 3 - MANUFACTURER AND REFERENCE

A. 'Manufacturer' - the firm under whose name the particular product is marketed.

B. 'Reference' - the proprietary brand name and/or reference by which the particular product is

identified.

PART 4 - EQUAL AND APPROVED

A. The phrase 'equal and approved' is deemed to be included whenever products are specified byproprietary name. Products of different manufacture may be substituted if prior approval has been

obtained in writing from the Engineer during the tender period. If no request for approval of

alternative manufacturers has been obtained during the tender period, the tenderer will be

deemed to have submitted his tender offer based on the manufacturer(s) name listed. No

approvals of alternative manufacturers will be allowed within the last two weeks of the tender

period.

B. Any item specified by Make & Model no. may be substituted with any one of the specified makesfor that particular item, which fully complies the features of the specified model. If no other

manufacturer can meet the features of the specified model, contractor shall provide the specified

item No alternative proposal is acceptable though the same is from one of the specified


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D. It will be necessary to obtain approval / instruction in writing from the Engineer before ordering

materials and starting work in the case where the manufacturers recommendations have changed

between tender and construction or where they conflict with any other specified requirements.

E. All work is deemed to be undertaken by / or under the close supervision of experienced

tradesmen, skilled in the particular type of work, and where materials, products and workmanship

are not fully specified they must be in accordance with 'good practice', as follows:

F. Suitable for the purpose of the works stated in or reasonably inferred by the Contract Documents

and the relevant drawings.

G. In accordance with good building practice, including the relevant provisions of current BS

documents.

PART 6 - COMPLIANCE WITH CONTRACT DOCUMENTS AND DRAWINGS SPECIFICATIONAND RELATED DOCUMENTS

A. Comply in full with all requirements described in, or implied, by this specification and with the

Conditions of Contract as well as Schedules and Drawings issued as part of the Contract

Documents.

PART 7 - CALRIFICATION OF DETAILS

A. Request clarification and make all necessary enquiries prior to submitting the tender regarding

any obscurities or contradictions on or omissions from the specification related Documents and


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- NFPA codes for fire alarms and emergency lighting

- Telecom provider regulations

PART 9 - COMPLIANCE WITH STANDARDS

A. Comply with the requirements of all relevant British Standards (BS) regarding equipmentmanufacture, design and installation whether or not these are specifically mentioned in the

Specification.

9.1 ALTERNATIVE STANDARDS

A. International Standards (ISO) or (IEC) which are equivalent to the appropriate British Standard

may be used. Other standards may be offered as an alternative only if submitted for approvalalong with the equipment manufacturers written assurance that they are equal to BS, ISO or IEC

Standards.

9.2 DISCREPANCIES

A. In the event of a discrepancy between the Specification and any BS or other approved standard

request clarification in writing from the Engineer.

PART 10 - COMPLIANCE WITH STATUTORY AND OTHER REGULATIONS


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10.2 OTHER REGULATIONS:

A. Comply in all respects with British Standard BS.7671:2008 "Requirements for Electrical

Installations" (IEE Wiring Regulations, Seventeenth Edition), incorporating all current amendments.

B. Comply with the requirements of any Specialists appointed by Client / Engineer.

PART 11 - EXTENT OF WORKS

11.1 DESIGN:

A. Verify the following by calculation based on specified standards, Statutory regulations and / or

requirements. These calculations shall be submitted to the Engineer along with appropriate

material / shop drawing submissions and the same shall be complied by the contractor at noextra cost to client.

- all co-ordination of protective devices to prove discrimination

- all lighting calculations in accordance with design parameters

- all cable sizes and short circuit ratings

- all battery sizes for emergency lighting and UPS systems

- all containment system sizes


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11.3 SUNDRY COMPONENTS:

A. Provide all incidental sundry components necessary for the complete execution of the works and

for the proper operation of the installation, with their labour charges, whether or not these sundry

components are mentioned in the Contract Documents.

11.4 CO-ORDINATION:

A. Co-ordinate all services with regard to routing and allocation of individual service space in

relation to others within the given space.

B. Ensure electrical services and fittings are located at least 300mm from water services and are notlocated directly below.

C. Co-ordinate sequence of installation, method of support and exact location of fixing holes to bedrilled in the building structure, and ensure that this information is available in time to suit the

building programme.

11.5 TESTS:

A. Carry out all tests, adjustments and commissioning as described in this Specification and as

required by each system in order to give an effective working installation to the satisfaction of theEngineer.


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C. Provide detailed sectional view drawings and fixing details of all components.

D. Provide drawings as described in this Specification.

11.9 INSTRUCTION MANUALS:

A. Provide manuals as described in this Specification.

PART 12 - MANUFACTURERS

A. Provide materials and equipment for each service or function, as far as possible, of one

manufacture and as per the manufacturers listed.

PART 13 - SUPERVISION

A. The contractor will provide a Building Services coordinator in addition to full-time site supervisory

staff for each discipline.

B. In addition to the above, the contractor shall obtain Specialist vendors approvals for the

installations prior to offer for the Engineers approval. This is applicable for and not limited to FireAlarm, PA/VA, BMS, Emergency Lighting and all other ELV systems.

C. Provide CVs for proposed full-time site supervisory staff for approval by the engineer prior to

them being sited. The C.V. should demonstrate the candidates experience (not less than 10


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PART 15 - REQUESTS FOR INFORMATION

A. The contractor shall design, procure, install, test and commission a complete low voltage

power distribution system in accordance with DEWA and BS7671 requirements, the

design drawings and in accordance with the specifications. This shall include but not belimited to the following:

PART 16 - QUALITY ASSURANCE

A. The contractor shall submit and obtain approval for the following within 28 days from

date of project award / prior to commencement of works,

- PQP Project Quality Plan

-ITP Inspection Test Plan

B. Upon Approval / Agreement on the above, the contractor shall submit detailed method

of statements for installations, testing & Commissioning for the Engineers approval prior

to commence the same. Method of statement for specialist systems installation, testing and

commissioning shall be from respective approved vendors.

C. The contractor shall comply the above plans & methods fully and to the satisfaction of the

Engineer. Any deviation which may require shall be approved in writing from theEngineer. However, the review / comments / approval of the Engineer does not relieve

contractor from the responsibility of complying to the contract documents and local


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PART 17 - SUBSTITUITION OF NON-APPROVED MATERIALS

A. Should any material or equipment be used without approval, the Engineer reserves the

right to request the substitution of the correct material or equipment. Should any

substitution be necessary the Contractor will bear the cost of any associated builder's

work or making good.

B. The acceptance of alternatives must be agreed and confirmed in writing by the Engineer.

PART 18 - SAMPLES

A. Provide samples of any materials to be used on site as and when requested by the

Engineer. The cost of providing said samples shall be borne by the contractor.

B. Note that the Engineer may require the samples to be subjected to tests to ensure

compliance with British Standard and other relevant specifications. The cost of such tests

shall be borne by the Contractor.

PART 19 - TEMPORARY USE OF INSTALLATIONS

A. Do not use any of the installations for any temporary purpose, except installation andcommissioning tests, without approval from the Engineer.


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PART 21 - RECORD OF WORKS

A. The contractor shall maintain a programme of works indicating in detail the number of

men and hours allocated to specific tasks. The program shall indicate on a system by

system basis all aspects of the building services works. The programme will be updated

at least every two weeks and submitted to the engineer accordingly.

B. In addition to the above, the contractor shall maintain set of marked up drawing, which

shall reflect the progress to date and any installation amendments / deviations from such

approved drawing. This shall be provided to the Engineer at any time during course ofthe progress of works.

PART 22 - WORKING DRAWINGS

22.1 GENERAL REQUIREMENTS

A. Develop the design drawings to detailed working / installation drawings.

B. All drawings will be prepared using the latest version of AutoCAD.

C. Submit to the Engineer for comment, three A1 size paper prints and one A3 copy of eachdrawing detailing the accurate and proper execution of the works. Ensure that all

services such as Mechanical, Architecture, Structure, ID, Approved Equipment Suppliersand Specialist requirements have been fully complied prior to commencement


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B. Text and line thin. Thicknesses shall be sized such that they can be read when the

drawings are reduced to A3 size. The tenderer shall allow for all general layout

drawings being produced at 1:100 scale when printed on A1 size paper and 1:50 or

1:20 scale for heavily serviced areas e.g. toilet areas, electrical switch rooms, plant

rooms etc.

22.3 TITLE

A. Incorporate an approved 'Title Block` on all drawings with the following information

clearly indicated.

B. Name of project.

C. Scale of drawing.

D. Title of drawing, incorporating the name and location of the service or services shown.

E. Drawing number in accordance with an approved numbering system designed for use by

all trades.

F. Name and address of the Main Contractor and the Sub-Contractor.

G. Name and address of the Main Consultant and the Building Services Consultant.

H. Drawing referred for preparation of working drawing ( For example : Design drawings of


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F. Show all water and air flow rates on appropriate drawings.

G. Show details of all control equipment.

H. Show co-coordinated sections through service routes.

I. Show wall elevations in electrical rooms.

J. Show wall elevation for typical arrangement for mounting of electrical devices to suit

various applications e.g. water heaters, hand dryers, A/C controllers etc.

22.5 WIRING DIAGRAMS

A. Provide wiring diagrams for all systems detailing all circuitry within equipment, togetherwith inter-connecting wiring to associated equipment.

B. Indicate containment systems for external circuit wiring.

C. Indicate the sizes and types of all cables together with the ratings of all such items as

fuses, switches and control devices.

D. Show all terminal markings.

E. Arrange the circuit diagrams, where possible, so that the main sequence of events is from

left to right and from top to bottom of the diagram and produce the diagrams generally


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B. Detail all internal circuitry and arrangement of equipment.

C. Detail external layout of equipment including terminals and indicate any restrictions of

access to equipment, lifting information and fixing recommendations.

D. Indicate all component ratings, terminal references and wiring sizes.

22.7 BUILDERSWORK DRAWINGS

A. Provide Builders work drawings showing full dimensions of all foundations, bases, plinths,

holes and the like as well as the overall dimensions and mass of the plant concerned.

B. Small holes, fixings and the like other than in plant rooms, switch rooms and roof areas

may be marked out on site, with the agreement of the Engineer, instead of on drawings.

22.8 CONTRACTOR'S RESPONSIBILITY

A. Comment by the Engineer on any drawings will not relieve the Contractor of his

responsibility with respect to the accuracy of such drawings, nor to provide suitable

equipment as specified, provided that any discrepancies, errors or omissions are not due

to inaccurate information or particulars furnished in writing by the Engineer.

B. Any delay resulting from the failure to provide accurate and sufficient drawings and other

information in time to suit the construction programme will be the Contractor's


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PART 23 - RECORD DRAWINGS

23.1 GENERAL REQUIREMENTS

A. Produce a comprehensive set of 'as installed` drawings, based on the Working / Progress

Drawings, for the purpose of providing a complete and clear record of the finished Works for

future users.

23.2 FORMAT

A. Produce the final drawings, after corrections to take into account any comments by the Engineer,

to a standard A1 metric size to BS 3429 : 1975 and in accordance with BS 308 : Part 1 : 1972

to ensure suitability for microfilming.

23.3 TITLE

A. Refer to same for Working Drawings, plus :

B. Date of completion of the installation.

23.4 ISSUE

A. Supply to the Engineer not less than 3 weeks prior to the issue of a "Practical Completion


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23.5 CONTRACTOR'S RESPONSIBILITY

A. Comments by the Engineer on any Record Drawing will not relieve the Contractor of his

responsibility with respect to the accuracy of the drawing, nor will it imply the Engineer's

acceptance of responsibility for the accuracy or completeness of the drawing.

PART 24 - INSTRUCTION MANUALS

24.1 GENERAL

A. Compile a comprehensive set of Manuals for the purpose of providing the future users with a clear

and complete understanding of the correct procedures for operating and maintaining all

installations, plant and equipment installed under the Building Services section of the works.

B. Two copies of all final parameters and password details on separate CDs shall be handed over

to the client.

24.2 CONTENT

A. Provide the following information:

B. Description of each systems function.

C. Detailed description of all operation procedures.


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J. Details of all components used within the installation.

K. Local agent contact details for each component.

24.3 INDEXING

A. Clearly indicate on the cover or on the inside front page of the Manuals the following information:

B. Document Index and/or Content List. The index may include only the main headings of all

sections of the document, but in that case the individual sections should be preceded by a content

list giving full details of the documentation included within the section.

C. Name, address, and telephone number of the Contractor.

D. Date of installation.

24.4 ISSUE

A. Supply to the Engineer not less than 3 weeks prior to the issue of a "Practical Completion

Certificate", one preliminary copy of the manuals for comment.

B. Provide the Employer at or before the date of practical completion, two copies of the final

approved manuals.

C. A practical completion certificate for the contract will not be issued without receipt of these


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F. Client's Name and Address

G. Engineer's Name and Address

H. Main Contractor's Name and Address

I. Provide all of the content of the agreed manuals in electronic format (*.PDF) organized into a

similarly indexed electronic file as the hard copy. Provide index pages with hyperlinks to eachindividual section of the manual or to each individual items electronic data.

24.6 FAILURE OF INSTALLATION

A. Failure of any part of the installation subsequent to the 'hand over` that can be attributed to lack

of maintenance or incorrect operation by the User caused by omitting to supply adequately

detailed Operating and Maintenance Procedures at the time of 'hand over`, must be rectified atno expense to the Employer.

PART 25 - PLANTROOM NOTICES

25.1 SCHEMATIC DIAGRAM

A. Provide in each plant room and switch room, a print of the schematic diagram on a varnish

timber base with a perspex front cover, or equal, and erect it on the switch room wall using screw

fixings.


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25.4 INSPECTION NOTICE:

A. Provide a Periodic Inspection Notice in the form prescribed in the IEE Regulations, with the

addition of the Installing Contractor's name.

B. Mount the notice on a varnished timber base with a perspex front cover, or equal and erect on

the main switch room wall beside the schematic drawings using screw fixings..

PART 26 - MATERIALS TO BE HANDED OVER

A. Hand over to the Employer, spare lamps, fuses, tools, loose equipment and the like (where

specified) and obtain the Employer's signature of receipt for such material.

B. Submit a copy of each receipt with the final account for the Contract, together with an inventory

of the materials handed over.Sub-main cables shall be XLPE/SWA/LSF type whilst final circuitsshall generally be LSF sheathed single core cables.

PART 27 - SPARE PARTS AND TOOLS

27.1 SPARE PARTS: Hand over to the Employer the spare parts specified and the list of spare parts

recommended by the manufacturer of each item specified.

27.2 TOOLS


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PART 29 - LABELLING ABND IDENTIFICATION

29.1 GENERAL

A. Identify all items of equipment, cables and circuit wiring, pipework and ductwork, by means of

labels, colour coding, numbered ferrules and terminals.

B. Labels warning of danger must at all times be clearly visible to maintenance and operating staff.

C. Do not use adhesive fixings on labels mounted external to equipment.

29.2 IDENTIFICATION AND WARNING LABELS

A. Fix to all plant, equipment, switchboards, control panels, loose switchgear, distribution boards

and the like, labels giving the reference, duty and rating indicated on the Contract Drawings.

B. Fix warning labels, as necessary, for the safe operation of the equipment or system.

C. Manufacture the labels from 2mm minimum thickness white laminate, engraved with 6mm high

'Optima' pattern letters, unfilled black for normal service equipment and 10mm high letters

unfilled red for essential services equipment and warning notices.

29.3 IDENTIFICATION PLATES


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B. Fit the diagram into a perspex 'pocket' fixed to the inside cover of the unit.

29.6 TERMINAL MARKINGS

A. Identify each terminal within switchboards, distribution boards, control panels and control

equipment by suitable terminal markings bearing numbered or lettered reference corresponding to

those on the circuit charts and wiring diagrams.

29.7 WIRING IN DISTRIBUTION BOARDS AND CONTROL PANELS

A. Identify all conductors by means of numbered ferrules bearing the circuit reference corresponding

to those on the circuit charts and wiring diagrams.

29.8 CABLE IDENTIFICATION

A. Identify cables at switchboards and control panels by means of a stamped brass or aluminium

label giving the cable size, number of cores and function.

B. Fit labels at 30 metre intervals along the run of the cable and on either side of transit frames,

walls or similar obstructions on the cable route.

C. Secure to the cable with galvanized iron or tinned copper binding wire.


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SECTION 260519 - LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and SupplementaryConditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Building wires and cables rated 600 V and less.2. Connectors, splices, and terminations rated 600 V and less.

B. Related Requirements:

1. Section 260513 "Medium-Voltage Cables" for single-conductor and multiconductor cables,

cable splices, and terminations for electrical distribution systems with 2001 to 35,000 V.

2. Section 260523 "Control-Voltage Electrical Power Cables" for control systemscommunications cables and Classes 1, 2 and 3 control cables.

3. Section 271500 "Communications Horizontal Cabling" for cabling used for voice and


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1.5 APPLICATION

1. Provide XLPE/SWA/LSF cables unless otherwise indicated.

1.6 CONSTRUCTION

A. Multi-core :

1. stranded copper conductor

2. XLPE insulated

3. tape-bedded, steel wire armoured

4. LSF outersheath.

B. Single-core :

1. Stranded copper conductor,

2. XLPE (or PVC) insulated as indicated

3. tape-bedded, single aluminium wire armoured

4. PVC outer sheath.

1.7 INSULATION

1. Single Phase Power

2. Phase Wires - Colour of Phase3 Neutral Wires Black


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1.9 INSTALLATION

A. GENERAL :

1. Refer to Contract Drawings and BS 7671 for method of installation.

2. Refer to Contract Drawings for cable routes.

3. Obtain Engineers approval to cable route layout drawings prior to commencing anyassociated preparatory work on site.

4. Do not store or install cables in locations directly exposed to solar radiation.

5. Do not use winches to pull cable.

6. Do not install through joints in cables.

7. Install all cables a minimum of 25mm from the nearest wall or solid surface.

8. Do not install cables within 300mm of water, gas and other piped services.9. Do not route cables below water services pipework.

10. Ensure provision is made for adequate cable bends throughout the cable route.11. Cables on tray /ladder/U-channel supports:

12. Provide cable tray/ladder containment systems for all armoured cables. Provide cable

ladder unless otherwise indicated on the drawings.

13. Grouped cables installed on cable containment will be spaced apart by at least one cable

diameter (of the larger cable) throughout the length of the cables run.

14. Secure cables to cable tray/ladder/U-channel using cleats where the cable is fixed to a

vertical cable support surface or ties where the cable tray surface is horizontal.15. Cable in ground (direct buried and in single way ducts) :

16. Install buried LV cables 600mm below local finished ground level unless otherwise detailed

on the Contract Drawings


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PART 2 - PRODUCTS

2.1 INSULATED WIRING CABLES

A. APPLICABLE STANDARDS

1. PVC to BS 6004, 450/750 Volt grade.

2. LSF to BS 6724, 450/750 Volt grade.

INSTALLATION

A. Ensure that all wiring is looped from live and neutral terminals of accessories for circuit

progression.

B. Do not joint wiring cables except at the terminals of accessories or equipment.

C. Ensure that cables within equipment are neatly dressed and bound with nylon cable ties at

intervals of 100mm, or contained in perforated PVC trunking permitting 'take-offs' as required.

D. Use heat resisting cable sleeves where circuit wiring terminates at, or passes through luminaires

or equipment terminal boxes, which may be subject to temperatures in excess of 0oC. Providewiring cables as follows:


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F. Do not install wiring originating from different distribution units in accessory or outlet boxes, other

than those designed for multi-phase use.

G. Do not reduce the cross sectional area of circuit cables from that originating at the circuit

protection device.

H. Allow for colour coding wiring cables by heatshrink oversheathing at all terminations within

distribution boards and equipment.

I. Use crimped terminations for cables above 6sq.mm.

J. Do not use pinch screw terminal devices.

K. Identify circuit wiring within distribution equipment by using ferrules giving circuit reference at

neutral bar, earth bar and incoming and outgoing terminals.

L. The number of wires grouped within containment systems shall not exceed the capacities listed in

the IEE Wiring Regulations.

2.2 MINERAL INSULATED CABLES

A. STANDARDS

1. To BS 6207, 600 volt grade unless otherwise stated.

B. CONSTRUCTION


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1. Ensure that all wiring is looped from live and neutral terminals of accessories for circuit

progression.

2. Do not joint cables except at the terminals of accessories or equipment.

3. Ensure that cable bends are not less than six times the diameter of the cable.

4. Install cable passing through walls or floors in a conduit sleeve with brass bushed ends.

5. Protect cable where concealed in plaster and the like, with galvanised steel channel.

6. Fit 'SPACE RANGER' gland terminations with round milled edge heavy gauge locknut.

7. Provide sealing pot and sealing compound within each termination.8. Where gland entries are not threaded, cut cable tails to suit and sheath with colour coded

neoprene.

9. Provide surge divertors at all luminaire connections in accordance with manufacturers

recommendations.

10. Cables should be straightened where necessary using the cable manufacturers MI cable

straightener tool.

11. Cables should be bent where necessary using the cable manufacturers MI cable bender

tool.

2.3 FIRE RETARDANT POWER SUPPLY CABLES

A. STANDARDS

1. BS 6387 category CWZ

2. BS 4066-13. BS 4066-3

4. Local Civil Defence Approved.


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6. Do not install through joints in cables.

7. Install all cables a minimum of 25mm from the nearest wall or solid surface.

8. Do not install cables within 300mm of water, gas and other piped services.

9. Do not route cables below water services pipework.

10. Ensure provision is made for adequate cable bends throughout the cable route.

E. CABLES ON TRAY/LADDER/U-CHANNEL SUPPORTS :

1. Grouped cables installed on cable support will be spaced apart by at least one cable

diameter (of the larger cable) throughout the length of the cables run.

2. Provide cable tray/ladder containment systems for all armoured cables unless otherwise

indicated on the drawings.

3. Secure cables to cable tray/ladder using cleats where the cable is fixed to a vertical cable

tray/ladder surface or ties where the cable tray/ladder surface is horizontal.

PART 3 - EXECUTION

3.1 SLEEVE AND SLEEVE-SEAL INSTALLATION FOR ELECTRICAL PENETRATIONS

A. Install sleeves and sleeve seals at penetrations of exterior floor and wall assemblies. Comply with

requirements in Section 260544 "Sleeves and Sleeve Seals for Electrical Raceways and

Cabling."

3 2 FIRESTOPPING


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SECTION 260526 - GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section includes Electrical bonding systems and equipment.

B. Section includes grounding and bonding systems and equipment, plus the following specialapplications:

1. Underground distribution grounding.

2. Ground bonding common with lightning protection system.

3. Foundation steel electrodes.

1.3 ACTION SUBMITTALS

A Product Data: For each type of product indicated


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1.5 CLOSEOUT SUBMITTALS

A. Operation and Maintenance Data: For grounding to include in emergency, operation, and

maintenance manuals.

1. In addition to items specified in Section 017823 "Operation and Maintenance Data,"

include the following:

a. Instructions for periodic testing and inspection of grounding features at test wells

ground rings grounding connections for separately derived systems Insert locations

based on NETA MTS NFPA 70B.

1) Tests shall determine if ground-resistance or impedance values remain within

specified maximums, and instructions shall recommend corrective action if

values do not.

2) Include recommended testing intervals.

1.6 QUALITY ASSURANCE

A. Testing Agency Qualifications: Member company of NETA or an NRTL.

1. Testing Agency's Field Supervisor: Certified by NETA to supervise on-site testing.

B. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by

l f d d k d f d d l d l


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2.2 TAPE FIXING DEVICES

A. Secure bare copper tape to structure with fixing devices which avoid piercing tape and ensure

3mm (minimum) clearance of tape from structure, at 450mm maximum, centers.

B. Material for fixing system earthing copper alloy conforming to BSEN 50164.

2.3 EARTH ELECTRODES RODS FOR SYSTEM EARTHING

A. Standard BS 7430.

B. Form SOLID COPPER rod with female thread each end.

C. Dimensions Rod Diameter 15mm nominal Rod length 2.4m (2x1.2) minimum.

D. Earth electrode couplings Use high strength driving cap in contact with driven rod and couplings of

compatible material fully enclosing the rod threads.

E. Interconnect electrodes using bare copper tape 25mmx6mm.F. Earth electrodes in draw pits provide concrete cover, permanently labeled for electrodes installed

through cable draw pit bases.

G. Main earth conductor connection Connect main earth conductor to first electrode using heavy-duty

purpose mode silicon aluminum bronze body conductor clamp and high tensile phosphor bronze

bolt in compliance to BSEN 50164.

H. Material to be minimum size as BS 7430 Table 4 Copper.

I. Accessories

J. Rod to tape clamp in compliance to BSEN 50164. Sized to suit earth rod and connector


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C. Use no joints in main equipotential bonds.

2.7 SUPPLEMENTARY EQUIPOTENTIAL BOND

A. Provide supplementary equipotential bonds to BS 7430 and BS 7671.

B. Joints not allowed in these bonds.

C. Material Insulated cable, single core to BS 6004.

2.8 CIRCUIT PROTECTIVE CONDUCTORS

A. Material : Insulated cable, single core to BS 6004 as indicated:

B. Size: Provide protection conductors sized in accordance with BS 7671 (IEE Regulations) 543-

01-03 and Tables 54B, 54C, 54E and 54F or provide protective conductors sized in accord-ance with BS 7671 (IEE Regulations) 543-01-04 and Table 54G.

2.9 EARTHING CLAMPS

A. Use clamps complying with BSEN 50164, for bonding pipes and lead sheathed cables or similar.

2.10 EARTH BARS

A. Material: Manufacture earth bus bars from hard drawn, tinned, high conductivity copper bar.


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2.12 LUGS/TAGS

A. Provide lugs or tags to enable connection of bonding conductors to equipment earth terminals.

2.13 PROTECTIVE CABLE TERMINATIONS

A. For bolted connections use crimp type lugs compressed by automatic tool to achieve correct pres-sure and crimp depth.

2.14 PROTECTIVE CONDUCTOR WARNING NOTICES/LABELS

A. Provide a permanent label marked in letters 4.75mm minimum height SAFETY ELECTRICAL

CONNECTION DO NOT REMOVE, in A visible position, at each bonding conductor connection

to extraneous conductive parts.

2.15 MAIN EARTH CONDUCTOR WARNING TAPES

A. Provide green/yellow PVC tapes labeled EARTHING CONDUCTOR over complete external

lengths of main earth conductors at 300mm depth below finished ground.

2.16 EARTH BAR LABEL

A. Label earth bar SAFETY ELECTRICAL CONNECTION DO NOT REMOVE with wall mounted


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C. All exposed conductive parts associated with the electrical installation and all extraneous con-

ductive parts must be earthed via protection conductors.

D. Conduit/trunking etc. shall not be used as the sole protective conductor; however it will require

to be electrically continuous and will be tested to ensure it is so.

2.19 EARTH CONTINUITY

A. Earth continuity between separate items of switchgear, distribution boards etc., mounted adjacent

to one another shall be effected by means of high conductivity continuous copper tape, or LSF/PVC

sheathed cable colored green and yellow and sized in accordance with Chapter 54 particularlySection 543 of the BS 7671 (IEE Regulations), connecting all items to the earth terminal.

2.20 PROTECTIVE CONDUCTORS

A. All items of switchgear, accessories, luminaires, conduits and the other sheaths of MICS cables, the

armouring of all PVC/SWA/PVC cables together with all other items of electrical plant and equip-

ment shall be effectively earthed by means of a protective conductor in accordance with Chapter

54, particularly Section 543 of the IEE Regulations.

2.21 TERMINAL BOXES

A. At every terminal point on the fixed wiring system an integral earth terminal shall be provided, e.g.


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2.24 KITCHENS

A. All equipment located in kitchens, e.g. cookers hobs etc shall have an additional supplementary

protective conductor interconnecting all pipework and the main earth terminal.

2.25 FLOORS & CEILINGS

A. All metallic floors and ceilings shall be sufficiently bonded to ensure that with a reasonable number

of tiles removed, earth continuity is maintained in accordance with the IEC Regulations.

2.26 FLEXIBLE CONDUIT

A. Where lengths of flexible metallic conduit connect to machines or other equipment, the flexible

conduit shall be supplemented by an external protective conductor, (sized in accordance with BS

7671 (IEE Wiring Regulations) of stranded copper conductor PVC/LSF insulated coloured

green/yellow and connected between the rigid conduit and the earth terminal on the equipment.

2.27 ARMOURED CABLES

A. Bond the sheaths and armour of low voltage and medium voltage cables solidly to earth using the

earth terminal of a proprietary cable gland.

B. Separate earth continuity conductors sized in accordance with BS7671 and the Statutory Authority

requirements shall be installed with all armoured cables and shall be bonded to the equipment


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electrolytic ally compatible with those metal parts. Use the guidance given in BS 7430 Table 8

when bonding dissimilar materials.

2.30 TAPE JOINTS

A. Provide waterproof protection at joints subject to moisture by using Denso Tape. Joint copper tapes

by brazing, using zinc-free brazing metal with melting point at least 600C or exo-thermic welding(If PVC coated, then 160 C, if hard drawn copper, then 250 C).

2.31 STRANDED CONDUCTOR JOINTS

A. Provide waterproof protection at joints subject to moisture. Joint copper stranded conductors with

compression joints to BS 3288 Part I.

2.32 PROTECTIVE CABLE TERMINATIONS

A. For bolted connections use crimp type lugs compressed by automatic tool to achieve correct

pressure and crimp depth.

B. Make connections between tape and equipment using high tensile grade brass bolts with brass

nuts, washers and locking devices. Use phosphor bronze bolts nuts and washer where connec-tions are liable to corrosion.

M N l h f h W h l b


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G. Depth of Electrode heads

H. Locate electrode heads just below ground level.

I. Spacing

J. Where electrodes are installed in a group ensures minimum distance between electrodes in twice

depth of rod. Where rods for clean earth are installed ensure distance from any system rods issix times depth of clean rods.

K. Tape Depth

L. Install interconnecting or electrode tape 750mm below finished ground level, rising vertically at

each electrode.

M. Connect grouped so electrodes to main earth conductor via bolted link in inspection pit as BS 7430

for test purposes

7. Backfilling

Backfill the immediate surrounds to the electrodes with low specific resistivity material (Bentonite for

retaining the moisture and Marconite to be used along with cement as a conductive aggregate).

Ensure backfill is well compacted and watered. Where soil backfill is insufficient to provide suffi-ciently low earth resistance then provide electrolyte backfills as required.

8 El t d l

P DMS N 139305 P l J h C f h W B h Cl b


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2) Proprietary crimps, by purpose made automatic machine, ensuring that a crimp, once

started cannot be released until full pressure, and crimp depth has been achieved. Wrap

joint in Denso tape below ground

3) Proprietary fusion welding system. Installed strictly in accordance with manufacturers in

structions. Wrap joints in Denso tape below ground

C. Ensure that where holes are drilled in the copper tape for connection to it