hatton park primary school extension and alteration works · provide "as fitted" drawings...

HATTON PARK PRIMARY SCHOOL

EXTENSION AND ALTERATION WORKS

ELECTRICAL ENGINEERING SERVICES SPECIFICATION

Mouchel Business Services The Business and Technology Centre, Bessemer Drive, Stevenage, SG1 2DX T 07827 311597 E [email protected]

Document Control Sheet

Project Title Hatton Park Primary School

Report Title Electrical Engineering Services Specification

Revision 01

Status Preliminary

Control Date 7th June 2016

Record of Issue

Issue Status Author Date Check Date Authorised Date

01 Prelim M Stamp 26/05/16 C Platt 03/06/16 D Clark 07/06/16

Distribution

Organisation Contact Copies

Mouchel File Copy 1

Kier Construction Eastern Ben Adams 1

Prepared by Date Approved Date

M.Stamp

26.05.16 D. Clark 07.06.16

Issue Date : June 2016 10/1

Rev. No. : 01 DMS-365 A:\Projects\ProjectFiles-All Clients\CambridgeshireCC\Hatton Park\B - DELIVERY\16.0

Specifications\16.3 Electrical\160607-MS-Hatton Park - Elec Performance Spec.doc

ELECTRICAL ENGINEERING SERVICES PERFORMANCE SPECIFICATION

HATTON PARK PRIMARY SCHOOL

INDEX

STANDARD MATERIAL AND WORKMANSHIP CLAUSES V1 GENERAL V2 COMPLIANCE WITH REGULATIONS AND CODES OF PRACTICE V3 MATERIALS AND WORKMANSHIP V4 TENDER DOCUMENTATION V5 INSTALLATION DRAWINGS AND BUILDERS WORK DETAILS V6 HANDOVER INFORMATION V7 DEMONSTRATION AND INSTRUCTION V8 VISITS TO SITE V9 ASBESTOS OR OTHER SUBSTANCES HAZARDOUS TO HEALTH IN

EXISTING BUILDINGS

V10 ELECTRICITY SUPPLY AND METERING EQUIPMENT V11 EARTHING ARRANGEMENTS V12 MOUNTING HEIGHTS V13 IDENTIFICATION LABELS AND NOTICES V14 MAIN SWITCHGEAR V15 DISTRIBUTION BOARDS V16 CABLES V17 CONDUIT, CABLE TRUNKING AND CABLE TRAY SYSTEMS V18 FLEXIBLE TERMINATIONS V19 LIGHTING INSTALLATIONS V20 SOCKET OUTLET CIRCUITS V21 SURFACE EQUIPMENT GENERALLY V22 INSPECTION, TESTING AND COMMISSIONING V23 QUOTATIONS

V24 SAFE WORKING PRACTICES WITH ELECTRICITY V25 WORK ON OR NEAR LIVE CONDUCTORS

PARTICULAR SPECIFICATION

V26 ALTERATIONS/ADDITIONS TO STANDARD CLAUSES V27 DESCRIPTION OF WORKS V28 DESCRIPTION OF BUILDING V29 OPERATING AND MAINTENANCE MANUALS V30 to V32 NOT USED V33 ELECTRICITY SUPPLY V34 MAIN SWITCHGEAR V35 DISTRIBUTION BOARDS V36 SUB MAIN CABLES V37 SYSTEMS OF WIRING V38 WIRING ACCESSORIES V39 LIGHTING INSTALLATION V40 EMERGENCY LIGHTING V41 EXTERNAL LIGHTING V42 SOCKET AND FUSED CONNECTION OUTLETS V43 DATA INSTALLATION V44 TELEPHONE INSTALLATION V45 TV/FM SYSTEM V46 FIRE ALARM V47 INTRUDER ALARM V48 DOOR ENTRY SYSTEM V49 CCTV INSTALLATION V50 LIGHTNING PROTECTION V51 MECHANICAL INSTALLATION V52 EARTHING & BONDING V53 AUDIO FREQUENCY INDUCTION LOOP V54 COMMISSIONING & DEMONSTRATION

Issue Date : Oct 00 10/1



ELECTRICAL ENGINEERING SERVICES STANDARD MATERIAL AND WORKMANSHIP CLAUSES V1 GENERAL The Electrical Engineering Services Standard Material & Workmanship Clauses shall

be applicable to all electrical engineering works, unless otherwise stated in the Particular Specification, or on the drawings. It shall be read in conjunction with any preliminary clauses, any Particular Specification and/or drawings applicable to the works. Where discrepancies arise between these documents the order of precedence shall be as follows:-

Drawings. Particular Specification. Standard Material & Workmanship Clauses. The symbols used on drawings shall be in accordance with those appended to this

specification. V2 COMPLIANCE WITH REGULATIONS AND CODES OF PRACTICE

The works shall be carried out in accordance with all relevant statutory requirements,

the current edition of BS 7671 - Requirements for Electrical Installations (complete with Amendments and Guidance Notes), the requirements of the Regional Electricity Company, British Standard Codes of Practice, Approved Documents of the Building Regulations and recognised trade association and professional institution practices. BS 7671 shall henceforth be referred to as the Wiring Regulations.

All regulations, standards etc., referred to shall be deemed to incorporate all current

amendments and guidance notes in force. Where applicable, the recommendations of the Building Services Research and

Information Association (BSRIA) shall be complied with. Where an interpretation or a recommendation concerning any of these requirements

has been published by the National Inspection Council for Electrical Installation Contracting (NICEIC) this shall be taken as the definitive version.

V3 MATERIALS AND WORKMANSHIP All materials used shall be new and unused, and shall both before installation and on

completion, be free from rust, scale, deformation or discolouration and be of the type and manufacture specified. They shall conform with the requirements of any appropriate British Standard Specification and be CE marked.

All materials shall be selected to withstand the external influences they will be

subjected to, be compatible with their surroundings and be capable of being maintained.

No materials generally known to be deleterious shall be used.




Any materials which show deterioration due to neglect in storage or installation will not be accepted.

The specific instructions of original equipment manufacturers shall be adhered to in

every respect. Workmanship shall conform to the standard of first class engineering practice. Equipment shall be erected plumb and true with fixings capable of sustaining a

minimum weight of 40kg or three times the weight of the item, whichever is the greater. No item shall rely on one fixing only.

The work area shall be kept clean and tidy with all rubbish etc. removed upon

completion of the task. V4 TENDER DOCUMENTATION The contract documents shall be deemed to include those drawings and

specifications on which the contract for the works are based. Drawings may include Sketch Drawings, Schematic Drawings or Detailed Design Drawings.

The determination of unspecified parameters may form part of the works. This could

include the production of Co-ordination Drawings and Schedules where these are not included as part of the Tender Documentation or stated as to be produced during the Production Information Stage.

The Particulars of Contract shall state whether the Construction (Design and

Management) Regulations (CDM) apply in full. In such instances the Planning Supervisor's pre-contract Health and Safety plan will accompany the tender documents.

Where a tender summary and schedule of rates are included in the Particular

Specification these shall be completed fully and submitted with the tender to be used for pricing any variations, additions, omissions etc.,

V5 INSTALLATION DRAWINGS AND BUILDERS WORK DETAILS Installation Drawings, Shop Drawings, and Builders Work Details shall be produced

by the Contractor as required for the construction of the works, and/or if called for in the Particular Specification.

These shall be submitted for examination prior to any installation and/or manufacture

taking place. Two sets of drawings shall be required showing details of plant rooms, general arrangements of the installation, wiring diagrams for control circuits, layouts of panels etc.,

V6 HANDOVER INFORMATION V6.1 Record Drawings

Prior to the issue of the Practical Completion Certificate for the Works, comprehensive As Installed Drawings finalised in detail and approved shall be provided. They shall beforehand be submitted for comment for suitability of purpose (but not accuracy) and shall include all of the requirements detailed in BSRIA Building Applications Guide BG 1/2007. Draft copies of the drawings must be submitted not less than 4 weeks before the date of Practical Completion. Any amendments necessary in the light of any comments shall be made and the drawings re-submitted for the engineer's approval.




Only after the engineer's final comments are the final copies of the drawings to be produced. The finalised drawings shall be provided to the engineer not less than 2 weeks before the date of Practical Completion Failure to issue these in time may result in withholding the Practical Completion Certificate, or alternatively the engineer may produce them and the actual production cost will be contra-charged to the contractor. From time to time, as required throughout the execution of the Works, evidence that adequate and accurate records such as will ensure the ultimate completeness and accuracy of the As Installed Drawings shall themselves be progressively examined as the work on site proceeds. All drawings and diagrams shall be produced on AutoCAD v 2013, and issued on 2No CD’s. Drawings prepared by suppliers of component items shall be in the same form as above, except where they are incorporated in Instruction Manuals when paper is acceptable. The As Installed Drawings shall be clearly endorsed AS INSTALLED DRAWING near to the title block and shall be drawn to a scale of not less than one hundredth full size.

V6.2 Operating and Maintenance (O&M) Manuals The operating and maintenance manual shall be provided 14 days prior to Practical

Completion as part of the works. It shall include all the information necessary to provide for the safe and efficient operation and maintenance of the engineering services which comprise the works.

The manual shall meet but not necessarily be limited to the requirements of the following:

BSRIA Building Applications Guide BG 1/2007

Health and Safety at Work Act 1974 (HSWA) Construction (Design and Management) Regulations 2015 (CDM) Control of Substances Hazardous to Health Regulations 1988 (COSHH) Any other relevant legislation. Manuals shall be Class D as described in BSRIA Building Applications Guide BG

1/2007. Class D manuals shall comprise the contents detailed in BSRIA Building Applications

Guide BG 1/2007, which shall generally be as follows:

As-installed drawings showing circuits and their ratings and locations of fittings and apparatus. Include wiring diagrams for the various systems showing all relevant information, devices, junction boxes, cable routes and sizes, etc.

Keep a written record of all changes and include on 'as installed'. Record the exact routes and sizes of conduits, cables, adaptable and draw-in boxes, etc.

How to use the manual

Emergency information

Contractual and legal information

Full technical description of each system installed. List of normal consumable items.

Asset list/equipment schedule

Parts identification and recommended spares

Manufacturer's operating and maintenance instructions for fittings and apparatus.




Manufacturer's guarantees and warranties.

Spares policy

Commissioning data

Maintenance recommendations and records to date

Fault finding

Lubrication required

Modification information

Disposal instructions

Names and addresses of manufacturers

Index of plans and drawings

Manufacturer's literature, Brochures, wiring instructions, etc. for special equipment supplied e.g. dimmers, RCDs, luminaires, fire alarm, class change, transformers or any other item of equipment, which will be useful for future maintenance.

A list of materials, equipment and plant used including part numbers, sizes and quantities.

Recommended maintenance schedules on any special items of equipment. Copies of all test certificates, commissioning certificates, etc. Schedule of installed equipment and expected life with schedule of

recommended periodic maintenance requirements. Details of incoming services. Copies of 'Operating Instructions' for all equipment, plant and systems

installed

Provide "as fitted" drawings in electronic format for importing into the Client’s systems, currently AutoCAD LT2013 for M&E services. Include suitable layering for the various services etc. - submit proposals to the engineer.

The Class D manual shall be prepared by a specialist author as recommended by

BSRIA or as approved by the engineer. The O & M manual shall clearly describe isolation procedures, and appropriate

locations shall be marked on the record drawings. Copies of the distribution schedules shall be included within the manual.

A project contact directory shall be provided at the front of the manual. The client shall have sole copyright. Practical Completion may be withheld until the O & M manual has been provided to

the satisfaction of the CA. V6.3 Maintenance All systems shall be properly maintained in accordance with the manufacturer's

requirements, and relevant British Standards etc., and trade practices to the date of Practical Completion (unless ongoing maintenance comprises part of the specified works). As part of the O & M manual, comprehensive maintenance recommendations and records of maintenance to date shall be provided. From the date of Practical Completion the client will assume the responsibility for maintenance (unless maintenance is part of the works).

Where the O & M manual, record drawing or any other relevant maintenance

information is not handed over prior to Practical Completion, the Contractor shall be responsible for the cost of maintenance and the consequences of a lack of proper maintenance during the period between Practical Completion and approval of the relevant documents, as detailed in BSRIA TN 15/95.




V6.4 Health and Safety File The O & M manual inclusive of all record drawings shall comprise an integral part of

the Health and Safety file as defined by the Construction (Design and Management) Regulations (CDM) irrespective of whether these regulations apply in full to the works.

Where the CDM Regulations apply in full to the works, the Planning Supervisor shall

approve the Health and Safety File and may not approve Practical Completion until such time as a suitable file is prepared.

V6.5 Log Books Fire Alarm, Emergency Lighting and Lightning Protection systems where forming part

of the works, shall be provided complete with a log book as detailed in the appropriate British Standard.

Where any other system is supplied with a log book then this shall be provided. Log

books shall accompany (but not form part of) the O&M Manual, and instructions on their use shall be contained in the O&M Manual.

V7 DEMONSTRATION AND INSTRUCTION At Practical Completion the building occupier shall have the whole of the works

described and demonstrated to them. This shall include instruction in the use of all plant, operation of all equipment, systems, controls, isolation and minor maintenance procedures, etc., all as is necessary to enable the systems to be fully understood and correctly operated.

It should be noted that the Instruction cannot properly take place until the Operation

and Maintenance Manual has been provided and that the said Instruction is subject to those Health and Safety Implications detailed for

O & M Manuals. V8 VISITS TO SITE Where the work involves the alteration, extension or modification of an existing

installation in an existing building, the Contractor is advised to visit the site prior to submitting a tender in order to ascertain the full extent of the work. No claims for additional work, which should have been identified by a site visit, will be considered.

V9 ASBESTOS OR OTHER SUBSTANCES HAZARDOUS TO HEALTH IN EXISTING

BUILDINGS The Contract Administrator shall inform the Contractor where asbestos or other

substances which are hazardous to health are known to exist. The Contractor shall inspect the premises' Health and Safety File for records of

asbestos or other substances prior to commencing the works. The employer may have records additional to those in the Health and Safety File. Where the Health and Safety File is not present or in the opinion of the Contractor is not complete, the Contractor shall request additional records from the employer, and such records shall not unreasonably be withheld.

Attention is drawn to the fact that works may be required in the vicinity of asbestos of one form or another.

The Contractor will be required to inspect the Property Asbestos Log Book (for

buildings where they exist) prior to carrying out any works on existing buildings, and must sign in the appropriate column to confirm he has done this. He will be required to follow the procedures set out in the Log Book. If the Log Book indicates that the




area of works will disturb asbestos, the Contractor must inform the Contract Administrator and await instructions.

If asbestos is specifically mentioned in the Particular Specification, then the specified

instructions shall be executed. Where during the course of the works, asbestos or other substances are found, which

in the opinion of the Contractor are hazardous to health, any work which involves the disturbance of such a substance shall be immediately stopped. If working within a ceiling void or duct, close the access covers, or if working in a boiler or plant room, close the door and put up a notice "NO ENTRY". Inform the Contract Administrator immediately and await further instructions.

If an accident occurs whereby asbestos or other substances are inadvertently

disturbed in no circumstances attempt to sweep up or dispose of it but report to the Contract Administrator after complying with the above requirements.




V10 ELECTRICITY SUPPLY AND METERING EQUIPMENT Where the provision of an electricity supply cable from the Regional Electricity

Company is required this shall be separately detailed elsewhere. The application for the provision of metering equipment (other than for a Contractors temporary supply) shall be carried out by the Client. The prospective short circuit current and the external earth loop impedance shall be stated in the Particular Specification where known.

V11 EARTHING ARRANGEMENTS Unless otherwise detailed the provision of an earthing terminal will be by the Regional

Electricity Company, and connected to a Protective Multiple Earthed (PME) network. The earthing arrangements shall comprise the TN-C-S system, and protection against indirect contact shall be by earthed equipotential bonding and automatic disconnection of supply unless an alternative system is detailed.

Circuit protective conductors (CPC) shall comprise those contained within (or the

sheath of) composite cables unless otherwise detailed. Where separate or supplementary protective conductors are required these will be detailed in the particular documents.

Where required by the Wiring Regulations main equipotential bonding conductors

shall be installed connecting the main earthing terminal to extraneous conductive parts. These parts include gas, water or any other service or part that may be specified in the Particular Specification or on the drawings. Where main equipotential bonding conductors are connected to a main earthing terminal they shall be fitted with a label designating their function. Equipotential bonding conductors shall be connected to localised extraneous conductive parts. Such parts shall be deemed to include the peripheral grids of suspended ceilings.

Local supplementary bonding connections shall be installed where required by the

Wiring Regulations, and additionally between exposed conductive parts having a resistance in excess of 0.05 ohm.

V12 MOUNTING HEIGHTS Equipment shall be mounted at the following heights above floor level (AFL) to the

centre of the item unless otherwise detailed in the particular documents.

Mounting Heights of Electrical Equipment and Accessories

Item Mounting Height above FFL Notes

Distribution boards 1500 Secure areas

Distribution boards 2200 Non - secure areas

Fire alarm panels and Intruder alarm panels

1500

Disabled refuge - main panels 1450 To centre of panel

Disabled Refuge - remote panels 1100

Disabled alarm pull cords 900 and 100

Fire telephones 1350

Socket outlets 500 General

Socket outlets 150 (#) Above worktops.

Light switches 1100

Data/Telephone outlets 500

Fire alarm call points 1100

Fire alarm sounders 2350

Dado trunking As drawings




Connection units – hand dryers 2200 Switched

Connection units – fire alarm panels

2200 Unswitched

Where items of equipment are to be installed immediately adjacent to each other, but detailed to be at different mounting heights as indicated in the above table, then the Contract Administrator shall be consulted to facilitate an aesthetic solution.

V13 IDENTIFICATION LABELS AND NOTICES Each item of switchgear (including MCCBs), control gear, distribution equipment and

joints shall be labelled or engraved unless there is no possible confusion over its purpose. Where specialist labelling or engraving is required this will be detailed in the particular documents.

Unless otherwise detailed labels shall be traffolyte with black lettering on a white

ground, of a size appropriate and proportional to their application. Labels shall generally be screw fixed unless adhesive fixing is agreed with the Contract Administrator.

Every item of equipment or enclosure within which 400V exists shall have a black on

yellow label (to BS 5378) label reading "DANGER - 400 volts". Where separate enclosures (within 2m of each other) house terminations having 400V between them, each item shall have a black on yellow label affixed internally reading "DANGER - 400 volts between adjacent equipment".

Each distribution board shall have its protective devices sequentially numbered.

Single phase boards shall be numbered commencing at 1. Three phase boards shall be numbered using the notation 1R, 1Y, 1B, 2R, 2Y etc.

Distribution equipment shall be equipped with a typewritten distribution schedule

installed within a clear PVC pocket fitted to the inside of the hinged lid. Where there is insufficient space inside the equipment, or where there is no hinged lid, then the schedule shall be mounted within a glazed frame screw fixed adjacent to the equipment. The schedule shall identify the utilisation, area served, current rating, and size of conductors for each protective device. (Note that copies of these schedules are required for the O&M Manuals).

At the origin of very installation a periodic inspection and test notice as prescribed in

the Wiring Regulations shall be affixed. Note shall be taken that it may not be deemed safe to authorise Practical Completion

without the proper identification notices and labels. V14 MAIN SWITCHGEAR Main switchgear shall generally comprise either HRC fusegear or moulded case

circuit breaker panels mounted directly on to brick or block walls, and interconnected with steel cable trunking.

All switchgear shall be complete with locking-off facilities to enable secure isolation. An installation drawing of the switchgear shall be submitted to the Contract

Administrator, or alternatively the equipment shall be laid out on site for approval before erection commences.

A suitable chart giving instructions for dealing with electric shock shall be installed

adjacent to each switchboard. The chart shall be a waterproof type as provided by Electrical Review, the British Safety Council or similar.




V15 DISTRIBUTION BOARDS Distribution boards shall be installed at heights agreed on site, and connected to

suitable steel cable trunking to house outgoing cables. The distribution boards shall be fitted with the rating and types of protective devices

detailed, blank covers or fuse bridges for spare ways, adequate earthing terminals, hinged lids and locking off facilities. Where RCBOs or RCDs are specified these shall be 30 mA unless otherwise detailed.

1 No dolly locking device shall be provided with each MCB distribution board. Distribution schedules shall be fitted as previously detailed. V16 CABLES V16.1 Generally The types of cables to be installed shall be detailed in the particular documents.

Cables shall not be installed under tension, they shall be installed parallel or at right angles to walls and floors, under no circumstances shall diagonal runs be permitted. The fixing centres, bending radii and identification of conductors shall accord with the Wiring Regulations. Proprietary fixing clips shall be used.

Cables with reduced neutrals shall not be installed unless detailed elsewhere. Cables shall not be installed when the ambient temperature is below 0oC. Joints

shall not be permitted unless by prior agreement with the Contract Administrator. Unless otherwise stated the minimum size of cable used shall be 1.5mm2. In all cases cables shall have BASEC approval, unless an approval system is not in

force for the particular cable type. Cables and their enclosures passing through fire barriers (i.e. walls and floors) shall

be internally and externally sealed against the propagation of fire. Small holes shall be sealed with a PVE foam aerosol, larger holes and trunking etc. shall be sealed with proprietary intumescent blanket material.

V16.2 Electromagnetic Compatibility (EMC) Low voltage cable installations shall not cause damage, interference or malfunctions

of other systems.

To reduce electromagnetic interference (EMI), mains voltage and signal cables following parallel routes shall have minimum separation as detailed in the following table unless otherwise specified.




MINIMUM SEPARATIONS IN mm FOR ALL TYPES OF INTERFERENCE MAINS VOLTAGE CABLES (SOURCE) SIGNAL CABLES

(RECEPTOR) Twin

& Earth Earthed Conduit

Earthed Trunking

Steel Wire Armoured

MICC

Twin PVC Sheathed 145 145 120 105 15 Unscreened Twisted

Pair 65 25 25 15 15

Screened Twisted

Pair 20 15 15 15 15

Aluminium Foil

Screened 80 30 35 25 15

Steel Wire Armoured 15 15 15 15 15 MICC 15 15 15 15 15 Coaxial 20 20 15 20 15

Acknowledgement is made to the ECA for the use of the above table. Unless specifically stated single core cables shall not be installed (with the one

exception of short 'tails' at meter connections). Lighting circuits shall employ 2 and 3 core cables using the '3 plate' method.

Where single and 3 phase circuits installed in conduit or trunking comprise separate

unsheathed cables, the cables for each separate circuit shall be taped together to minimise EMI.

Where screened cable is specified, unless otherwise detailed, its screen shall be

earthed at the supply end only and insulated at the remote end. V16.3 Underground Cables Underground cables or ducts shall be installed at a minimum depth of 450mm, on a

bed, and with a cover, of sifted soil or sand. A continuous length of proprietary yellow marker tape labelled "CAUTION ELECTRIC CABLE BELOW" shall be installed over the complete length of the cable at 200mm below ground level.

Where ducts are specified they shall be from the 'Rigiduct' range of twin walled, high density polyethylene ducting. Underground ducting shall be in accordance with the National Colour Coding System for buried services as follows:

Colour Service Black LV Electricity Red HV Electricity Blue Water Yellow Gas Grey/White Communication and Alarms Green Cable and Closed Circuit Television

Where underground cables surface they shall be in an area where damage is

unlikely, or they shall be enclosed in conduit, or covered with capping for a height of 1.8m. Cable ducts terminating in a building shall be sealed to prevent entry of vermin etc.




As an alternative to excavation, and where specified, ducts may be installed by the

thrust-boring technique. In this case the ducts shall have the words "DANGER ELECTRICITY CABLE" printed on them.

Underground cables shall be installed segregated by a minimum horizontal distance

of 400mm from other services. Where cables cross other services they shall be installed within ducts. Where supplementary protective conductors are specified they shall be installed

immediately BELOW the main cable. Reinstatement shall be equal to the existing surrounds and shall include re-

tarmacking or re-turfing. V16.4 Multicore Armoured Cables Unless otherwise detailed these cables shall comprise:-

1. PVC insulation, Single Wire Armour and PVC sheath (PVC/SWA/PVC) to BS 6346. for conductors up to 10mm2

2. Thermosetting insulation (XLPE), Single Wire Armour and PVC sheath to

BS 5467, for conductors of 16mm2 and above or 3. XLPE insulated, Single Wire Armoured, Low Smoke and Fume (LSF)

sheathed to BS 6724 and 4. Conductors shall be copper (cu) unless aluminium (al) is specified.

The cables shall be 600/1000V grade, with the armouring used for earthing purposes

unless otherwise detailed. The termination of the armouring shall generally be by a mechanical cable gland to BS 6121, a proprietary earth tag washer (fixed with brass nut and bolt), and a PVC or LSF shroud.

The gland shall be either dry indoor, weatherproof or flameproof as required for the

environment. If armoured cables are recessed into wet plastered walls termination shall be made

without using a cable gland, the armouring being terminated directly onto an earth terminal. Alternatively an additional cable core shall be used for the protective conductor.

In non-industrial interiors where groups of wiring cables enter distribution boards in cable trunking, the armoured cables shall take the same route. The armour shall be terminated with an earthing clamp to BS 951, and connected to an equivalent size copper tail. Terminations for copper conductors connecting to stud terminals shall be with crimped lug terminations. Terminations for aluminium conductors shall be crimped, lug type for stud terminals, and pin type for tunnel terminals, or alternatively aluminium to copper tail connectors shall be used. The 'swaging' method of termination shall NOT be used. All crimping shall be with proprietary crimping tools and dies.




The treatment of aluminium conductors and armouring shall be as follows. Mating

surfaces shall be cleaned bright with wire wool then coated with a proprietary jointing compound. This shall be carried out immediately prior to crimping to prevent surface oxidisation.

V16.5 Mineral Insulated Cables Mineral Insulated cables (MI) shall be to BS 6207. They shall have copper

conductors and sheath, be light or heavy duty, with or without PVC or LSF over sheath as specified. Fittings shall be to BS 6081.

Cables shall be installed exactly in accordance with the manufacturer’s instructions

using proprietary tools. The cable shall generally be terminated using an earth tail seal and gland. Where termination boxes will not accept a male gland and locknut, a female pattern gland and male bush shall be used (steel conduit couplers shall not be permitted). Where proprietary MICC cable wiring accessories are specified, glands shall not be installed, and earth tail pots are not essential.

For flameproof applications cables shall be heavy duty and BASEEFA approved

flameproof glands and 'increased safety' seals shall be used. Cable cores shall have identification ferrules affixed. V16.6 PVC Insulated and Sheathed (Non-Armoured) Cables Unless otherwise detailed these cables shall comprise:-

1. Flat 2 or 3 core cables with circuit protective conductor to BS 6004 Table 5. (6242Y or 6243Y).

2. Flat 2 core cables (with or without CPC) 1.5 or 2.5 mm2 with stranded

conductors to BS 6004 Table 6. (6242Y) 3. Single core, flat 2 or 3 core cables without CPC to BS 6004 Table 4. (6181Y,

6192Y or 6193Y). 4. Circular twin, 3 or 4 core cables to BS 6004 Table 3 (6182Y, 6183Y or

6184Y). 5. Circular twin, 3 or 4 core cables with CPC and heavy duty sheath (e.g.

'Hituf').

All cables shall be 300/500V grade with copper conductors. Unless otherwise stated all cables shall be multicore and complete with an integral circuit protective conductor. Single core cables shall NOT be in general use. Due to EMI problems, they shall be restricted to short lengths used for interconnecting switchgear and metering equipment. These cables shall not be installed surface clipped unless otherwise detailed. They shall be installed within cavities of ceilings, floors and partitions (but not in the cavities of external walls). Where cables drop from the ceiling (or rise form the floor) to wall mounted points, or are cast into concrete, they shall be completely enclosed within conduit or trunking. The conduit (or trunking) may be surface or recessed as specified in the particular document, and shall comply with the respective standard clauses.




For cables installed in accordance with these methods glands/clamps are not

generally required. V16.7 Fire Resistant Silicone Rubber Insulated Aluminium Foil and LSF Sheathed

Cable complete with CPC Fire Resistant Cables shall comply with BS 6387 and BS 7629, and have a BASEC

Certificate of Approval. They shall be multicore cables having copper conductors. The methods of installation shall be exactly in accordance with the requirements for

non-armoured PVC insulated and sheathed cables. For the prevention of mutual detrimental influence these cables shall be regarded (i.e. segregated) in accordance with the requirements for mineral insulated cables, for EMC separation the table in this specification is applicable.

Cables shall be installed exactly in accordance with the manufacturers requirements.

For terminations where space is limited, such as a circular conduit box, the conduit box shall be fitted with an extension ring sufficiently deep to avoid the cores being forced against the box.

Cable glands shall be installed in all cases other than where cables are enclosed

within conduit or trunking. Where the cable is reliant on its clipping to retain its integrity in the event of a fire, fire

resisting (i.e. metallic) clips shall be used. V16.8 Special Cables for Extra-Low Voltage Applications These cables shall include telecommunication, bell, call, sound distribution, data

transmission, alarm, radio and television cables. The cable shall be as specified in the Particular Specification. The methods of installation shall be exactly in accordance with the requirements for non-armoured PVC insulated and sheathed cables, unless otherwise detailed.

In some cases these cables will be installed by others (e.g. British Telecom).

Conduits provided for these cables shall be left with a draw wire installed. V16.9 Single Core PVC and LSF Insulated Cables These cables shall be 300/500V grade, have solid or stranded copper conductors and

be in accordance with BS 6004 Table 1(a), (6491X and 6491B). They shall be installed completely enclosed within conduit and/or trunking which shall

comply with the relevant sections of this specification. The type of conduit or trunking shall be specified in the Particular Specification. All wiring systems comprising single core PVC insulated cables shall have a separate circuit protective conductor installed unless otherwise specified. The size of the CPC shall be specified within the particular documents, and installed irrespective of the type of conduit systems. If not so specified the CPC shall comply with table 54G of the Wiring Regulations.

The spacing factor shall be in accordance with the Wiring Regulations.




V17 CONDUIT, CABLE TRUNKING AND CABLE TRAY SYSTEMS V17.1 Generally The types of conduit or cable trunking to be installed shall be detailed in the particular

documents, installed surface or recessed as specified. Conduit and trunking shall be installed vertical or horizontal and parallel to walls. Diagonal runs may be permitted in floors, ceilings and in some special circumstances such as a cooker final connection, subject to the approval of the Contract Administrator and where steel conduit is used. Recessed conduit shall not be installed in walls less than 100mm thick without prior instructions from the Contract Administrator.

The fixing centres for conduits and cable trunking shall not exceed HALF the

distances tabulated in the Wiring Regulations. Each conduit/accessory box shall be fixed independently of the conduit system. Bending radii of conduit shall be not less than the values stipulated in the Wiring Regulations.

Conduit and trunking systems shall be either continuous, for the installation of

unsheathed cables, or isolated sections for the protection and enclosure of sheathed or armoured cables. In both instances metallic conduit/trunking shall be bonded to the earthing terminal, but shall not in itself be used as a protective conductor, a separate CPC shall be installed. This requirement shall not apply to isolated lengths of conduit used as communication and data wire ways etc.

The use of inspection pattern conduit fittings shall not be permitted, all fittings

shall comprise circular, square or rectangular boxes. Where groups of cables enter distribution boards, or to alleviate multiple conduit runs,

trunking shall be installed, steel or PVC, to be compatible with the wiring system in use.

Where surface conduit or trunking is installed all the installation components shall be

suitable for the type of wiring, including the provision of surface patresses where these are required.

V17.2 Circular Steel Conduit Steel conduit shall be of metric dimensions to BS 4568. The sizes used shall be 20,

25 and 32mm. Steel conduit shall be heavy gauge welded, generally finished stove enamelled black (Class 2). For external applications, within boiler rooms, ducts and other damp situations, conduit shall be hot dipped galvanised (Class 4). For flameproof applications solid drawn conduit shall be installed. All conduit accessories shall match the type of conduit used.

Where steel conduit is installed surface mounted, screwed accessories shall be

used, any exposed thread lengths shall be treated with a compatible paint. Where steel conduit is recessed, 'pinch-grip' accessories may be used. Fixing of surface steel conduit shall be with distance saddles, and recessed conduit with pipe hooks (crampets). No other methods shall be used unless with the prior consent of the Contract Administrator.

The terminations of steel conduit into enclosures and boxes not fitted with spouts

shall be with a coupler and male bush.




V17.3 Circular PVC Conduit PVC conduit shall be to BS 4607 and BS 6099. The size used shall be 20mm and

25mm, and the conduit shall be of the super high impact heavy gauge grade. The colour shall generally be white, unless black is specified, and all accessories shall match the conduit.

The fixing of surface PVC conduit shall generally be by spacer bar saddles,

recessed conduit shall be secured with pipe hooks (crampets), and connections made with proprietary solvent cement. Where bends are required proprietary bending springs shall be used. In straight runs exceeding 6m an expansion coupling shall be installed.

V17.4 Steel Cable Trunking Steel cable trunking shall be to BS 4678 where applicable. It may comprise square,

rectangular, floor, skirting or bench trunking as specified. It shall generally comprise standard gauge finished stove enamelled dark grey, but for installations within boiler rooms and other damp situations trunking shall be hot dip galvanised pattern.

For each change of direction, and at every joint or 'T', the trunking

manufacturers accessories shall be used unless by prior arrangement with the Contract Administrator. Unless otherwise detailed bends and 'T's shall be radius pattern, and any reducers bellmouth pattern.

V17.5 PVC or GRP Trunking PVC cable trunking shall be to BS 4678 where applicable. It may comprise

square, rectangular, mini, cornice, architrave, dado, skirting, floor or bench trunking as specified. The finish shall generally be white.

For each change of direction and at each joint or 'T' the respective trunking

manufacturers accessories shall be installed. Where situations require butt or mitre joints the prior approval of the Contract Administrator shall be obtained.

V17.6 PVC Screeded Floor Ducting This shall be as specified complete with the manufacturers proprietary accessories

and installed exactly in accordance with the manufacturers requirements. Each length of trunking shall be covered with an overlapping (100mm each side)

expanded metal mesh prior to screeding. This metal mesh shall be earthed to an adjacent service box by a fixed earth terminal (brass nut and bolt), and a similar nut and bolt fixed through the metal mesh.

The precise location of outlets shall be confirmed with the Contract Administrator prior

to screeding. V17.7 Cable Tray or Basket Unless detailed otherwise, internal cable tray shall be heavy duty return flange

pattern of 1.5mm gauge minimum. It shall be hot dip galvanised steel to BS 729, and installed complete with the manufacturers accessories.

Cable basket shall be installed complete with the manufacturers accessories and

installed exactly in accordance with the manufacturers requirements.




V17.8 Cable Ladder This shall be alloy or GRP as specified, complete with the manufacturers accessories

and installed exactly in accordance with manufacturers requirements. V18 FLEXIBLE TERMINATIONS Flexible terminations shall be as detailed in the Particular Specification and shall

generally be one of the following methods. 1. PVC insulated cables shall be installed within PVC sheathed flexible

metallic conduit. 2. PVC insulated cables shall be installed within corrugated flexible PVC

conduit. 3. PVC insulated and sheathed flexible cords to BS 6500 shall be used. Method (1) shall only be used where the wiring is enclosed within steel conduit, and

method (2) where PVC conduit or trunking has been installed. In either case the manufacturers proprietary adapters shall be used.

Where method (3) is employed the cable shall be secured by means of a nylon

compression gland (unless a plug and socket or proprietary flex outlet accessory is specified).

The minimum sizes of flexible cords used shall be as follows:- Up to 5A 0.75mm2 (24/0.2) Up to 10A 1.0mm2 (32/0.2) Up to 13A 1.25mm2 (40/0.2) Up to 15A 1.5mm2 (30/0.25) Up to 20A 2.5mm2 (50/0.25) Up to 25A 4.0mm2 (56/0.3) V19 LIGHTING INSTALLATIONS V19.1 General The luminaires detailed in the Particular Specification shall be supplied and

installed complete with the types and ratings of lamps as specified. Tungsten lamps shall be general lighting service (GLS), pearl finish unless otherwise specified. Fluorescent lamps shall be T8 type 3500 K (White) from the standard range, unless other colour temperatures or deluxe range lamps are specified.

Unless otherwise specified lamps and lighting control gear shall be rated at 240V. All fluorescent luminaires shall be fitted with electronic starters. Lamps installed within discharge luminaires shall be of the same manufacturer as

the control gear. Ceiling-mounted pull cord switches shall have a minimum clearance of 150mm from

any door swing, and the associated cord shall be adjusted to finish at a distance of 1.4m above the finished floor level.




V19.2 Wiring The wiring of internal luminaires shall be carried out using the '3-plate' method with

the wiring being looped between luminaires and switches with 2-core cable, 3-core being used between two-way switches. Where special control switches which require a neutral connection are specified 3 core cable shall be installed. Junction boxes and single core cables shall not be permitted.

V19.3 Compact Luminaires Compact luminaires shall generally be installed fixed to circular steel conduit boxes,

the '3-plate' connection being made within the conduit box. Final connection shall be with a heat resisting grade of cable. V19.4 Linear Fluorescent Luminaires Linear fluorescent luminaires shall generally have the fixed wiring taken directly into

the luminaire, the '3-plate' connections being made at this point. Where cables passing from the '3-plate' connection to the luminaire terminal block are adjacent to control gear, a heat resisting grade of cable shall be used.

V19.5 External Columns or Bollards Where external columns or bollards are installed the ground shall be excavated and

the base set into concrete. The ground excavation shall contain 3 No steel stakes driven into the surrounding soil to 'lock' the concrete securely in position. A proprietary fused lighting cut-out shall be installed within the base compartment, internal wiring between fuse, control gear and lamp shall be with PVC insulated and sheathed cables.

V19.6 Emergency Luminaires Generally where self-contained emergency luminaires are specified, the

distribution board housing the appropriate circuit protective devices, shall be fitted with a label as follows, "Circuit numbers ........ feed emergency lights. To test emergency lights, switch off circuit breakers. TEST MONTHLY". This requirement shall be waived where alternative test devices are specified.

All self-contained emergency luminaires shall have their associated charge indicators

installed so that they are visible. Every slave (centrally supplied) luminaire shall be marked with a red dot, and

reference to this effect made in the O & M manuals. V20 SOCKET OUTLET CIRCUITS Socket outlets (and any fused connection units) shall be installed as detailed on the

drawings connected to ring or radial circuits as detailed. No fused or non-fused spur circuits shall be connected without the prior agreement of the Contract Administrator. These may be used to minimise circuit lengths for the connection of fan assisted heaters or other similar small fixed loads with consent.

Generally socket outlets shall not be installed within 500 mm (horizontally) of

sinks or wash basins. Socket outlets installed in lower, primary, junior and middle school classrooms, or in care premises shall not be installed closer than 1800 mm to any sink or wash basin.




These requirements may be waived for outlets with special forms of protection such

as in science laboratories. V21 SURFACE EQUIPMENT GENERALLY Where surface mounted equipment requires special patresses or other adaptors to

allow it to be mounted to the wiring system in use, then this shall be deemed to be included.

V22 INSPECTION, TESTING AND COMMISSIONING V22.1 Inspection and Test of the Electrical Installation The Contractor shall inspect and test the electrical installation (including fixed

electrical equipment) in accordance with the Wiring Regulations. The Electrical Installation Completion Certificate, as prescribed by the Wiring

Regulations, complete with a Schedule of Items Inspected and Tested, and Schedules of Test Results (one sheet for each distribution board) shall be completed and certified for both Construction and Inspection and Test. The Certificate shall be presented to the Contract Administrator for Design Certification prior to the Inspection and Test being carried out.

Where electrical installation work is carried out which does not involve the provision

of a new circuit, a Minor (Electrical Installation) Works Certificate as prescribed by the Wiring Regulations (Guidance Notes) shall be completed.

V22.2 Emergency Lighting The Contractor shall Inspect and Test any Emergency Lighting System in accordance

with the relevant British Standard Code of Practice. The Completion Certificate as prescribed in the Code of Practice shall be completed

and certified for installation and verification. The Certificate shall be presented to the Contract Administrator for design certification prior to the Inspection and Test being carried out.

V22.3 Fire Alarm Systems The Contractor shall Inspect, Test and Commission any Fire Alarm System in

accordance with the relevant British Standard Code of Practice. The Certificate of Installation and Commissioning as prescribed in the Code of

Practice shall be completed and certified. V22.4 Specialist Systems Where commissioning of specialist systems is called for in the Particular

Specification, an appropriate certificate recording the commissioning, the date and appropriate comments, complete with a certifying signature shall be completed.

V22.5 Control Systems All control systems shall be commissioned and their functional operation shall be

demonstrated to the Contract Administrator prior to Practical Completion. Where the controls are primarily the responsibility of other parties, attendance on site

during the commissioning process shall be included for as part of the Works.




V22.6 Commissioning and Completion Certificates and Test Results Generally Commissioning Certificates and Test Results shall be included within the O & M Manuals, which will comprise part of the Health and Safety File. Each of the premises has a responsibility to maintain records concerning health and

safety issues (i.e. a Health and Safety File). Where minor works or similar are carried out, and the Contract Administrator agrees

that no O & M Manual is required, one copy of any certificate or of test results shall be presented to the premises for their Health and Safety File. A second copy shall be forwarded to the Contract Administrator.

Practical Completion may be withheld until appropriate completion certificates or

commissioning data are provided. V23 QUOTATIONS Where the Particular Specification states quotation reference numbers these are

included as a general guide to the type of equipment or system required. It is the responsibility of the person tendering or installing to ascertain the exact quantities required from the information contained within the specification and on the drawings.

V24 SAFE WORKING PRACTICES WITH ELECTRICITY Whilst it may not always be possible to follow rigidly a set down procedure, the

following steps shall be implemented for all work on systems in excess of ELV, unless not REASONABLY PRACTICABLE.

The following requirements are stated without prejudice to the Electricity at Work

Regulations. V24.1 Isolation Any circuit or equipment to be worked on or near shall be disconnected from

every source of electrical energy. V24.2 Securing the Isolation Isolators shall be locked in the 'off' position. If a plug has been withdrawn, a fuse

removed, or an MCB switched off, ensure that they cannot be switched on or reinserted again by taking away or by locking the enclosure until the work is complete. If an enclosure does not inherently possess locking facilities and lock-off attachments for circuit breakers are not available, then padlocking brackets shall be fitted to the access.

V24.3 Proving Following isolation the parts to be worked on shall be proved to be dead by the use

of a proprietary voltage indicator. Voltage indicators shall be proved before use. V24.4 Notices At the point of isolation a 'danger' notice to indicate that someone is working on the

system, and may be injured if it is re-energised, shall be installed. This notice shall be red lettering on a white background.




V24.5 Earthing To further minimise the risk whilst working on isolated equipment, particularly where it

has been judged not reasonably practicable to securely isolate all circuit conductors (e.g. Including the neutral), it is preferable that all the conductors be earthed. This should be a matter of course for stored energy equipment (e.g. Capacitors).

V24.6 Adjacent Parts When the circuit or equipment to be worked on has been made dead it may still be

necessary to protect against inadvertent contact with other live parts nearby, by either erecting barriers, or taking the precautions detailed in the following clause.

V25 WORK ON OR NEAR LIVE CONDUCTORS Work on or near live conductors (in excess of ELV) shall only be undertaken in

extreme circumstances. When having regard to all relevant factors it is unreasonable for the equipment to be isolated whilst the work proceeds. The factors affecting this judgement shall be:-

1. When it is not practicable to work on dead equipment, i.e. Testing or fault

finding. 2. Where another hazard would be created, i.e. a reduction in response of an

emergency service (fire/police), unacceptable conditions within an elderly persons home, etc.

3. The requirement to comply with any statutory requirements. 4. The level of risk involved, the precautions available, and the inconvenience

caused by isolation. 5. Where supplementary protection by an RCD of a maximum operating current

of 30mA and operating time of 40ms (at 150mA) is installed. 6. Where low body resistance is to be expected. 7. The Contract Administrator shall offer guidance when required. Live work shall be undertaken only in accordance with the following requirements:- 8. Only experienced, adequately trained and competent persons, in possession

of adequate information (including where necessary fault levels) and suitable tools, shall be engaged in live working.

9. Adequate working space is available. There should be a minimum of one

metre clearance from live parts, adequate headroom and no tripping hazards. 10. Temporary insulated barriers shall be erected where possible to minimise

any hazard. 11. Persons whose presence is not necessary should not be near the live

conductors.




12. If at any time the person carrying out the work is not present, a 'caution'

notice shall be installed. This notice shall be black lettering on a yellow background.

13. Persons carrying out work on or near live conductors shall be accompanied

by another person capable of keeping others from the work area, switching off if a hazard arises and rendering resuscitation or aid if required.

14. The requirement for accompaniment in 13 above may be waived where the

person is working NEAR live conductors, AND the conductors are protected against earth fault by an RCD of a maximum operating current of 30mA, and operating time of 40ms (at 150mA).

For example, the adjustment of time/temperature devices within a boiler

control panel, and the inspection, replacement of plug-in relays or similar tasks on similar or identical equipment.

The foregoing requirements are stated without prejudice to the Electricity at Work Regulations.

Issue Date: May 16 10/50

Rev. No.: 0 DMS - 391 A:\Projects\ProjectFiles-All Clients\CambridgeshireCC\Hatton Park\B -

DELIVERY\16.0 Specifications\16.3 Electrical\160607-MS-Hatton Park - Elec Performance Spec.doc

PERFORMANCE SPECIFICATION

V26 ALTERATIONS/ADDITIONS TO STANDARD CLAUSES V26.1 RECORD DRAWINGS AND OPERATING AND MAINTENANCE (O&M) MANUALS OMIT the complete sub-clauses V6.1 and V6.2 and refer to the main contract

preliminaries. V26.2 MOUNTING HEIGHTS Replace Clause V12 with the following:-

Equipment shall be mounted at the following heights above floor level (AFL) to the centre of the item unless otherwise detailed in the particular documents. ITEM LOCATION HEIGHT

(mm) Lighting Switches 200mm to any adjacent door 1000 Socket Outlets Generally 450 Socket Outlets Above working plane 150 over working plane TV Points Generally 450 Telephone Points Generally 450 Telephone Points Wall Telephone 1400 Fire Alarm Contacts 1100 Fire Alarm Bells 2200 Thermostats 1500 Control Devices and Switchgear

800-1700

Indicators 1200-1900 V26.3 SOCKET OUTLETS All socket outlets shall have the ends of the protective conductors terminated

independently of each other at all connection points throughout the circuit, e.g, the distribution board, junction boxes and socket outlets. This requires all accessories to be provided with two separate earth terminals. At the distribution board information shall be provided indicating those circuits having a high protective conductor current.

V27 DESCRIPTION OF WORKS The works described herein relate to the extension and alteration of the school. V28 DESCRIPTION OF BUILDING External walls will generally be of brick construction. Internal walls will generally be of blockwork construction having a plastered finish. Floors will generally be of a screeded concrete finish. Ceilings within the classrooms shall slope following the contour of the roof. These

ceilings are to be open without a void.

Corridor areas will have suspended 600x600 modular grid type suspended ceilings.




Ceiling types can be identified by referring to the architects reflected ceiling drawings and room data sheets.

V29 DESCRIPTION OF WORKS The works described herein and on the associated drawings comprise the extension

and alteration of the electrical engineering services to Hatton Park School, Longstanton, Cambridge.

This performance specification covers the electrical engineering aspects of the works

at the school and shall comprise the design, supply, installation, setting to works, testing and commissioning of the systems indicated below:

Alteration of existing switchgear.

Replacement and alteration of parts of the main electrical LV switchgear

Replacement and alteration of parts of the sub main distribution system

Installation of new lighting, emergency lighting, external lighting and small power systems

Installation of CCTV system

Alterations to the earthing and bonding system

Installation of new and alteration/extension of new/existing fire detection and alarm systems.

Installation of new data system wiring

Installation of new and alteration/extension of the intruder alarm system equipment

Installation of access control and door entry system

Installation of new and alteration/extension of existing mechanical services power supplies

Installation of new lightning protection systems

Testing and commissioning

Operation and maintenance manuals

The Contractor shall allow to divert or remove any existing services within the area of the construction works, in particular the existing reception area. In certain cases existing equipment, wiring, or conduit may be re-used, but only as agreed by prior arrangement with the engineer on site. Redundant equipment shall be removed from site unless specifically stated otherwise elsewhere in this Specification.

The associated indicative drawings to be read in conjunction with this performance specification are: - 4701 Existing site plan electrical 4702 Proposed site plan electrical 4703 Proposed Lighting Control Philosophy 4704 Proposed Lighting Control Philosophy 4706 Proposed Lighting Control Philosophy 4707 Proposed Lighting Control Philosophy 4708 Proposed Electrical Containment 4709 Proposed Electrical Containment 4710 Proposed Electrical Containment 4711 Proposed Electrical Containment 4712 Proposed Fire Alarm Schematic 4713 Proposed Intruder Alarm Schematic 4714 Proposed Site plan CCTV




4715 Proposed Power Schematic 4716 Proposed Access Control Strategy 4717 Proposed Final Circuit Zones 4718 Proposed Final Circuit Zones 4719 Proposed Small Power 4720 Proposed Small Power 4721 Proposed Small Power 4722 Proposed Small Power 4723 Proposed Small Power 4724 Proposed Lightning Protection 4725 Proposed Data Schematic

V33 ELECTRICITY SUPPLY The contractor shall prepare and design the supply system for the proposed

extensions. V34 MAIN SWITCHGEAR New main switchgear shall be provided to serve the new extensions.

Indicative locations for switchgear are identified on the drawings. The contractor shall develop the proposals for the switchgear design and installation and agree the locations of all switchgear with the architect. New switch boards shall utilise MCCB protective devices to BS EN 60947.

Multi-function meters shall be installed into the main switchboard on every new outgoing circuit. New switch boards shall incorporate 20% spare capacity to facilitate additional/future connections.

V35 DISTRIBUTION BOARDS New SPN and TPN final circuit distribution boards shall be surface mounted

Miniature Circuit Breaker (MCB) type with sheet steel enclosures and hinged lids.

Each distribution board shall be complete with its own integral main isolator. Distribution boards shall be labelled indicating their use and reference number.

The distribution boards shall be complete with MCBs to BS EN 60898 and RCBO devices to BS EN 61009-1 (30mA) that occupy a single module within the board.

Each board shall be installed so as to provide access for maintenance purposes, with

a one metre space for live working. All distribution boards shall be fitted with an integral lock which shall be locked using

a common key. The Contractor shall provide and hand over five keys to the Contract Administrator on completion of the contract works.

V36 SUB MAIN CABLES

Sub main cables shall comprise cross-linked polyethylene, steel wire armoured, low smoke and fume (XLPE/SWA/LSF) cables. Cables shall be installed on cable tray or basket through the building in the circulation routes ceiling voids.




Supplementary bonding shall be installed between component parts of the metal cable support systems.

V37 SYSTEMS OF WIRING V37.1 General

Wiring shall be with multicore 0HLS insulated and sheathed cables installed within ceilings on cable tray/basket with metal conduits within the battened wiring void to wall points. NB- New extension internal partitions will be of CLT construction, partitions within the refurbished areas will be traditional plaster board on stud work. Separate cable tray/baskets shall be installed for each circuit category. Dado trunking is to be utilised in some areas as indicated in the drawings. Cabling within the areas with exposed ceilings shall be contained in surface PVC trunking installed to be as discreet as possible at high level following the contour of the ceiling.

V37.2 Plant Rooms

Wiring shall be with LSF insulated cables installed within galvanised surface steel conduit and trunking.

V37.3 Fire Alarm Systems Wiring shall be silicone rubber insulated fire resisting cables clipped to the building structure and/or dedicated cable trays within ceiling voids and conduit metal conduits to wall points. All cable shall installed in accordance with the manufacturers recommendations. The specification for the new cabling shall be as follows:-

> BS7629-1 > BS EN 50200 PH120 > BS EN 50200+Annex E > Use for BS5839-1, 6, 8 & 9 'standard' application circuits > BASEC Approved > LPCB Approved > Low smoke, zero halogen, flame retardant

V37.4 Extra-low voltage (ELV) Screened Cables Wiring between sensors and electronic controls shall be with 2-core 0HLS screened cables installed within ceilings and conduits to wall points. Particular attention shall be paid to the earthing of the screen, and the separation from mains voltage cables. The screen shall be earthed at the supply point only, and the cable shall be separated from mains cables by the dimension stipulated in the Standard Material and Workmanship Clauses.

V37.5 TV Cables

TV cables shall utilize CT100 grade co-axial 0HLS cables installed within ceilings and conduits to wall points.




V38 WIRING ACCESSORIES Wiring accessories shall generally be recessed pattern white finish, installed

generally in recessed knockout boxes. Where surface conduit is installed, surface steel accessories shall be used. Lighting switches shall be 20 Amp rocker operated grid switch type, or ceiling

mounted pull cord type as shown on the drawing. V39 LIGHTING INSTALLATION The contractor shall design, supply, install and set to work the lighting and associated

control systems. Luminaires shall incorporate LED lamp sources. Colour temperatures shall be 3500ºk (white) colour temperature from the standard colour rendering range.

V39.1 Lighting Management System

The contractor shall design, supply and set to work a lighting control/management system. The control requirements are indicated on the drawings. The system shall include the detection and control requirements indicated on the drawings together connections to the emergency lighting luminaires. The contractor shall engage the services of the control system manufacturer to commission and set the system to work.

V39.2 Surface Mounted Luminaires Surface mounted luminaires shall be fixed to builders work noggins. The fixed wiring shall enter the luminaire adjacent to the terminal block.

V39.3 Recessed Luminaires

These shall be installed to a reinforced ceiling aperture. The fixed wiring shall terminate in a Klik assembly.

V39.4 Suspended Luminaires

Luminaires shall be suspended using the appropriate manufacturer’s proprietary suspension kits. These shall be installed suspended from purlins of the pitched ceilings. For the purposes of tendering they should be installed to suspend at approximately 3000mm AFFL. The contractor shall liaise with the contract administrator/architect on site regarding the exact mounting height. Luminaires should be coupled together using the manufacturer’s proprietary joining components.

V39.5 Hall Suspended Luminaires

These shall be suspended from the roof using manufacturers approved proprietary fixings and suspensions. For tendering purposes the suspension distance shall be at a height of approximately 4m AFFL. The contractor shall liaise with the contract administrator/architect on site regarding the exact mounting height.




Electrical connections to the luminaires shall be via a 5 core 0HLS cable which will allow the lamps to be switched in pairs to allow 2 switching levels to operate 2 or 4 lamps.

V39.6 Lighting Switches

Lighting switches shall generally be 20A rocker operated grid pattern with white cover plates.

All multi-gang switches shall have engraved plates to denote the function of each

switch. The layout and engraving details of the switches shall be agreed with the contract administrator/architect prior to manufacture.

V40 EMERGENCY LIGHTING V40.1 General

The contractor shall design, supply, install and set to work an emergency lighting system to comply with the following:-

Health & Safety at Work Act

BS 764 Specification for automatic change-over contactors for emergency lighting systems

BS 5266 Emergency lighting

BS 5499 Graphical symbols and signs. Safety signs, including fire safety signs

BS EN 1838 Lighting applications.

BS EN 13032 Measurement and presentation of photometric data of lamps and luminaires

BS EN 50172 Emergency escape lighting systems

BS EN 60529 Specification for degrees of protection provided by enclosures (IP code)

BS EN 60598-2-22 Luminaires for emergency lighting

BS EN 60622 Secondary cells and batteries containing alkaline or other non-acid electrolytes. Sealed nickel-cadmium prismatic rechargeable single cells

CIBSE Lighting Guides and Codes

Specific requirements of the local Building Control Officer and Fire Officer

CDM requirements

V40.2 Luminaires

The emergency lighting system shall comprise of combined (primary/emergency) 3 hour maintained luminaires with separate internally illuminated exit signs located on escape routes and above final external exit doors. Illuminated exit signs shall be of the non-maintained type except within the small hall where they shall be switchable sustained type and operated using key switches. The exit signs shall be a connected to the local lighting circuit in the relevant area.

V40.3 Testing, Commissioning & Labelling




The contractor shall provide an automatic emergency lighting test system. The test system shall be manufactured by the luminaire manufacturer and shall incorporate bi-colour LED indicators and audible signals to indicate the electrical condition of the emergency luminaires. In the event of a failure of the emergency lighting unit to perform to the tests to BS5266, clear visual and audible signals are generated at the faulty luminaire.

Prior to practical completion the system shall be commissioned by the manufacturer. Test and completion certificates shall be formulated as modelled in BS 5266. A log book shall be provided to allow future test results to be recorded. All standby batteries installed for use with the emergency lighting shall be dated with the date of installation.

V41 EXTERNAL LIGHTING V41.1 Car Park and Access Column Lighting

The above existing lighting is to be retained and reused.

V41.2 Building Perimeter Lighting

Install wall mounted external luminaires to provide illumination of the perimeter access paths and the primary entrance to the pre-school. The contractor shall agree the mounting height of all luminaires with the architect/building services engineer however they shall not be mounted below 2.1m AFFL.

V41.3 External Lighting Control External luminaires shall be controlled via contactor arrangements connected to external photocells for switching the luminaires ‘ON’ and time switch control for switching the luminaires ‘OFF’. The contactor arrangements shall be housed in equipment service centres located adjacent to the distribution boards. Time switches shall incorporate a manual override facility.

V42 SOCKET AND FUSED CONNECTION OUTLETS V42.1 General The contractor shall provide a small power scheme to the extension and altered

areas as indicated in the room data sheets. Power outlets shall be connected to ring or radial circuits as required to suit the intended loads supplied by the circuit.

All socket outlets shall have double earth terminals for high integrity earthing arrangement. RCBO protection shall be provided to all socket outlet circuits.




V42.2 Hand Dryer Supplies

The contractor shall provide power supplies to the hand dryer position indicated in the room data sheets or shown on the architect’s drawings. The contractor shall provide the electric hand dryers protected by local unswitched fused connection units.




V42.3 Mechanical Supplies The contractor shall provide the electrical supplies to the various items of mechanical

services plant including; plant room equipment controls, the air source heat pump, remote under floor heating manifolds, remote sensors, window actuators, control panels, etc. The contractor shall liaise with the mechanical services installer to ascertain the required details of the electrical supplies required for the mechanical equipment.

All cabling within the plant room shall be LSF single core cable contained in galvanised trunking and conduit. Final connections to equipment shall be made with heat resistant flexible cord and in accordance with the manufacturer’s requirements.

V43 DATA OUTLETS V43.1 General The contractor shall provide a complete data and telephone system to the extension

and refurbished areas.

The contractor shall liaise with the ICT provider to determine the equipment requirements for the data and telephone systems e.g. cable types, patch panel capacities, switch requirements etc, The contractor shall prepare their design in accordance with the technical advisory notes (TAN’s) available from the ICT education service, contact Stuart Alder [email protected]

V43.2 Data Rack

The contractor shall provide a new data rack to serve the pre-school. The contractor shall provide a new cabinet in the existing server room. The contractor shall calculate and design the required cabinet using the criteria set out in the Cambridgeshire County Council Technical advisory notes available from the Project manager.

The data cabinet shall be earth bonded with a 6mm cable that is connected directly to the distribution board. All individual panels and door of the cabinet shall be earthed to the main cabinet earthing point with a 4mm cable, ensuring there is sufficient length of cable to allow the panels to be removed without disconnecting the earth cable

V43.3 Containment/Basket Work

Cables shall be routed through the building in the corridor ceiling void installed on a cable tray or basket.

V43.4 Specialist Installer

The contractor shall employ a specialist IT installer who is a registered Molex data system installer to install, test, commission and set to work and connect the data installation.

mailto:[email protected]




V44 TELEPHONE SYSTEM V44.1 General

The contractor shall provide the data cabling infrastructure which shall be used to carry telephone signals in addition to the data network.

V44.2 Redcare Telephone Line The contractor shall apply for 2no. Analogue telephone lines, 1no. For the fire alarm and 1no. For the intruder alarm. V45 TV/FM SYSTEM

The contractor shall provide a TV/FM system with outlets as detailed in the room data sheets. The location for the amplifier shall be in the main electrical intake room. The existing system shall be extended to provide the additional outlets required.

V46 FIRE ALARM INSTALLATION V46.1 General

The contractor shall design, supply, install, test and commission a complete analogue addressable single loop fire alarm system to the pre-school.

The contractor shall design, supply, install, test and commission the extension of the

existing “Gent Vigilon” system installed to cover the KS1 and KS2 extensions. The new system shall be a category L4 system as defined in BS 5839 Part 1. The contractor shall provide control equipment to permit the sounders be used as a

class change system. The contractor shall provide the digital remote signalling equipment via Redcar to an

alarm monitoring centre shall to be provided. V46.2 System Operation

On operation of any detector or call point the fire alarm panels in both the pre-school and the existing school shall go into alarm. The alarms will continue until they have both been cancelled at both of the control panels.

The system is to be connected to a Redcar line for alerting a remote monitoring

station.

V46.3 Pre-School Fire Alarm Panel The contractor shall provide a dedicated power supply for the fire alarm panel. The

power supply shall be derived from a separately switched circuit on the main MCCB switchboard.




V46.4 Alarm Indication The contractor shall provide electronic sounders with an MP3 recording of a bell

which shall ring continuously to indicate an alarm situation. These bells shall also be used for class change for which they shall ring for a pre-set period which shall agreed with the end user.

Where detailed on the room data sheets red xenon beacons shall be installed to give

a visual indication of an alarm situation. These beacons shall not activate during the class change operation.

V46.5 Testing and commissioning

The contractor shall make all necessary site inspections, adjustments and tests during installation to suit the demands of the programme and sectional completion of the project. The installation and commissioning, testing and inspection certificates shall be modelled on those in BS 5839: Part1.

Audibility tests throughout the building shall be fully demonstrated to the building services engineer. Two copies of all test data shall be submitted for acceptance within five working days of completion.

V46.6 Maintenance

The system shall be maintained by the specialist contractor for 12 months following the date of acceptance. Include for these costs within the Tender.

V47 INTRUDER ALARM V47.1 General

The contractor shall provide the security system and CCTV installation detailed on the drawings and room data sheets. The systems shall be provided by a specialist contractor approved by the National Security Inspectorate (NSI) and be on the Cambridgeshire County Council (CCC) approved contractor list, available from the project manager. The installation shall comply with the relevant parts of BS 4737, DD243 (2002) and the latest ACPO Policy and all NACOSS Codes of Practice. The intruder alarm system shall provide sequential verification. All wiring shall be concealed within the building fabric where possible. Where surface a installation is required this should be agreed with the architect/building services engineer.

V47.2 Intruder Alarm Control Panel The contractor shall provide a new intruder alarm system to the pre-school and extend the existing system to the new KS1 and KS2 Areas. The system shall be set and unset by a keypad mounted in the school’s entrance lobby area with a contact on the final exit. All other equipment shall be located in the administration office.




The system shall be commissioned and programmed with access zones as defined by the end user, which will allow access to either the school or the community area as required.

V47.3 Intruder Alarm Detectors The detectors will be of the dual technology type and shall be installed in suitable positions. Wiring to detectors shall be installed on the data/fire alarm cable tray in the corridor services voids as appropriate and dropping to each detector within steel conduit recessed as appropriate.

V47.4 Alarm Receiving Centre The intruder alarm company shall arrange for the connection of the new system to an alarm receiving centre via Redcar. The CCC alarm receiving centre contact details shall be requested by the contractor from the client.

V47.5 Intruder Alarm Warning Devices The contractor shall provide external and dummy warning devices to the external elevations of the building.

V47.6 Intruder Alarm Maintenance The specialist contractor shall maintain the system for a period of 12 months from the practical completion date. This cost is to be included in the tender return.

V47.7 Intruder Alarm Demonstration

The specialist contractor shall demonstrate the system on two separate occasions, obtain a written receipt from the occupier to indicate that adequate instructions have been provided and received.

V47.8 Power Supplies The contractor shall design, supply, install, set to works, test and commission the power supplies as required for the intruder alarm system control equipment.

V48 DOOR ENTRY SYSTEM V48.1 General

The contractor shall provide the door entry system.

V48.2 Internal Intercom The contractor shall supply and install internal intercom handsets in the pre-school office pre-school class rooms linked to the main pre-school entrance door. The handsets shall include an incoming buzzer, two-way speech facility and a door release button. The handset shall be wall or desk mounted at a position agreed with the architect /building services engineer.




V48.3 External Keypad and Intercom

Provide and install an external entry system keypad combined with call push button and an intercom, linked to the main pre-school door releases. Set the keypad to a code agreed with the occupier, for staff access.

V48.4 Door Release The inner doors of the entrance lobby are to be protected. The contractor shall install slim line electro-magnetic door magnets to the leading edge. The Contractor shall conceal the wiring within the building fabric. Provide and install a key switch override to enable an authorised user to release the doors for long periods of time. The key switch shall be combined with the with the door release push button in a single unit.

V48.4 Emergency Release Push Button Provide and install a green break glass unit to release the door magnets in case of emergency at each door position.

V48.5 Normal Release Push Buttons Provide and install normal release recessed push buttons engraved “Press to Exit” in 10mm characters to release doors for normal use. Position these switches at light switch height.

V48.6 Access Controls Instructions and Manuals Instruct users how to program and operate the system. Provide all installation information and manufacturers details within the manual.

V49 CCTV V49.1 General

The contractor shall provide external located cameras to the perimeter of the building. The contractor shall provide the internal cameras to view the main entry / exit door. The external cameras shall be static type with adjustable lenses. All cameras shall be positioned so as to prevent surveillance to public areas and domestic houses. All works are to be installed and commissioned for use by a specialist contractor.

V49.2 External Cameras Install high-resolution colour surveillance external vandal resistant domes and fixed

colour cameras. Each camera shall have integral heater, alarm facility and PIR activation together with its own power supply.




V49.3 Internal Cameras

Install high-resolution fixed position colour surveillance cameras in a ceiling mounted dome, positioned to record all visitors / staff using the main entrance door. Install wiring within the fabric of the building to a central location in the reception office.

V49.4 Recording / Monitor

Install a NVR (network video recorder) complete with multiplexer with minimum of 1Tb of memory complete with integral CD writer for digital image recording. The multiplexor shall be capable of being configured to operate through the schools computer network and be Internet compatible. Install a 15-inch Colour Monitor daytime monitoring, keyboard and joystick controller. The equipment shall be installed in the reception office.

V49.5 Signs Contractor shall provide 4 x A4 size signs to positions as agreed on site to comply

with the Data Protection act. Each sign shall contain the following information: (i) Identity of the person or organisation responsible for the scheme. (ii) The purpose of the scheme. (iii) Details of whom to contact regarding the scheme. (iv) A pictorial image of a camera.

V49.6 Maintenance / Monitoring The Contractor shall include for twelve months maintenance and monitoring charges

in relation to the CCTV work. The specialist contractor shall maintain the system for a period of 12 months from the practical completion date. This cost is to be included in the tender return.

V49.7 Instruction Provide instruction to the school staff on two occasions on the operation of the CCTV

system. V50 LIGHTNING PROTECTION SYSTEM V50.1 General

The contractor shall employ a specialist contractor to design, supply and install the lightning protection system. The lightning protection system shall be installed in accordance with BS EN 62305, the current edition of BS 7671 and shall comprise of internal surge protection devices, external earthing tapes, earth terminations and testing points as indicated on the drawing. Earthing tapes shall be installed beneath the roof tiles. Surface fixed strike plates shall be installed at maximum spacing’s indicated in BS EN 62305 at ridge and eaves levels. Electrode inspection pits shall be utilised as the system test points and will remain accessible at all times.




The lightning protection system shall be bonded to the main earth bar located at the electrical intake position.

Testing shall be carried out upon completion, in accordance with BS 7430:2011+A1:2015. The tests shall include. (i) The resistance value to earth of the earth termination network. (ii) The resistance value to earth of each earth electrode. (iii) The resistance value of a continuity test to the conductors. (iv) Scaled drawings showing the nature, dimensions, materials and positions of

all component parts of the lightning protection system. (v) The nature of the soil and any special earthing arrangements. (vi) The type and position of the earth electrodes, including reference electrodes. (vii) The test conditions and results obtained. (viii) Notes on the visual inspection.

(ix) Departures from BS EN 62305 (x) Dates of inspections including the inspectors name and signature.

V50.2 Labelling

The Contractor shall provide a label to the origin of the electrical installation and worded as follows:

“This structure is provided with a lightning protection system that is in accordance with BS EN 62305 and the bonding to other services and the main equipotential bonding should be maintained accordingly”.

V50.3 Site Liaison

Close liaison shall be required with the site to ensure no aspects of the system are omitted during the construction programme. It will be the Specialist Contractor’s responsibility to make sufficient site visits during the construction of the building so as to ensure the installation is comprehensive and meets the requirements of the Client.

V51 MECHANICAL INSTALLATION The contractor shall provide all power and control wiring to all items of equipment

indicated in the room data sheets and on the mechanical services drawings. The contractor shall provide control wiring for the mechanical systems. V52 EARTHING & BONDING

The contractor shall provide a main earthing bar with a removable link adjacent to the electrical intake position. This earthing bar shall be sized to accept 25mm cables. Contractor to provide all main equipotential bonding conductors to the requirements of BS 7671, these shall be sized at 25mm and shall include a bond to the steel structure and distribution board. The lightning protection system shall be bonded to the main earth bar.

All bonding connections shall be accessible but shall be concealed wherever possible. Earth clamps shall be in accordance with BS 951.




V53 AUDIO FREQUENCY INDUCTION LOOP SYSTEMS (AFILS)

Provide an audio frequency induction loop to the new KS2 hall and a portable loop to

the pre-school reception counter.

Ensure all equipment and systems are designed and installed to provide

electromagnetic compatibility with the system and with any other systems installed in

the same locations. At the start of the project install a trial induction loop, in

accordance with BS 7594, to identify any potential interference problems.

Ensure that, with the hearing aid switched to T, the user is not cut off from vital

sounds such as fire alarms and public/emergency announcements.

Provide amplification equipment which has input/line output connections from a

remote user worn wired microphone.

V53.1 Signs Mount appropriate signs on all AFILS equipment, loop cable junction boxes and

adjacent to the loop cable itself, and in the areas where reception of the AFILS is

available. Ensure the signs comply with BS 7594 and are located in positions that are

visible during normal use.

Clearly indicate on a plan of the room areas where the reception of the AFILS is not

satisfactory.

Ensure the plan is placed on a position that is visible by both hearing aid users and

staff. Place a sign complying with BS 7594 in the unsatisfactory area and / or on the

seats in that area.

Provide illuminated reassurance indicators where necessary, ensure that the

indicators and legend comply with BS 7594.

V53.2 Installation

Provide and infrared indication loop system within the hall to the specialist’s

requirements. Ensure all cabling is installed within suitable containment and

appropriate power supplies are provided where required.




V54 COMMISSIONING & DEMONSTRATION V54.1 General The contractor shall notify the employer’s agent 14 days before tests and/or

commissioning is to be carried out for the purpose of being a witness. Any such commissioning not witnessed shall be deemed invalid.

V54.2 General Wiring The general wiring and fixed electrical appliances shall be tested in accordance with

BS 7671 and the Inspection and Testing Completion Certificates submitted one week before practical completion. Any departures from the British Standard shall be rectified by the Contractor before handover.

V54.3 Emergency Lighting The emergency lighting shall be tested in accordance with BS 5266 and a certificate

completed and submitted one week before practical completion, complete with log book.

V54.4 Fire Alarm System The fire alarm shall be tested in accordance with BS 5839 and a certificate completed

and submitted one week before practical completion, complete with log book. V54.5 Mechanical Systems The contractor shall provide attendance to the mechanical services contractor and

controls specialist during the commissioning of the heating system and controls making any temporary connections as required.

V54.6 Lightning Protection System This shall be commissioned by a specialist and a certificate submitted in accordance

BS EN 62305. V54.7 Demonstration and Manuals The contractor shall provide prior to practical completion an electronic copy of

operation and maintenance (O&M) manual to BSRIA class D standard.

The manuals shall incorporate copies of all certificates following comments from the employer’s agent.

The contractor shall demonstrate all system to the occupier. Each system (fire alarm,

telephone, television, etc) shall be demonstrated on two occasions. The demonstrations shall be spread across several days and no more than two complicated systems demonstrated on the same day to allow the occupier to fully comprehend the operation of each piece of equipment. A record shall be kept of all persons that attend the demonstrations.