technical specifications for adb ngfo renovation … · 2019. 6. 29. · bill nr. 5 new kitchen...

TECHNICAL SPECIFICATIONS FOR ADB – NGFO RENOVATION WORK

CONTENTS OF THE DOCUMENTS

Instruction to Persons Tendering Form of Tender

Description of works

Bill Nr. 1 Article of agreement, Conditions of

Contract, Preliminaries and Preamble To the Trades

Special Electrical Services Specifications Special Mechanical Services Specifications Special IT and Clean Power cabling specifications

Bill Nr. 2 Administrative Block Bill Nr. 3 Operation Block A

Bill Nr. 4 Operation Block B

Bill Nr. 5 New Kitchen

Bill Nr. 6 Security Post Bill Nr. 7 External works


DESCRIPTION OF WORKS The works comprise the renovation and furnishing of ADB – NGFO office complex at Maitama, Abuja and consisting of the following:

Administrative Block Single storey reinforced concrete framed building.

Operation Block A Single storey reinforced concrete framed building.

Operation Block B Single storey reinforced concrete framed building.

New Kitchen Bungalow

Security Post Bungalow

External Works These include the walkways and soft landscapes NOTE Please note that the existing structures are fitted with services installations which complied with the standard technical requirements as specified bellow, thus the contractor must comply with minimum standard requirements for works and materials as specified hereunder.


ELECTRICAL SERVICES SPECIFICATION Consultant M & ASSOCIATES


CONTENTS

1. Technical Specifications - General Requirements 2. Technical Specifications - Power Distribution Equipment 3. Technical Specifications - Power Distribution Centres 4. Technical Specifications - Cable Support 5. Technical Specifications - Cable Installation 6. Technical Specifications - Wiring System 7. Technical Specifications - Earthing 8. Technical Specifications - Wiring Accessories, Small Equipment and Materials 9. Technical Specifications - Luminaries and Lamps 10. Technical Specifications - Lighting Protection 11. Technical Specifications - Inspection and Testing

12. Technical Specifications - Telephone and Intercomm System 13. Technical Specifications - Integrated Access Control Surveillance,

Fire Alarm.


1.0 TECHNICAL SPECIFICATIONS: GENERAL REQUIREMENTS 1.01 Extent of Work 1.01.1 This specification states the requirements for maintenance, supplying, assembling/fixing in position,

connecting, inspecting, testing and leaving in working order new, modified or additional electrical installations.

1.01.2 The work shall comprise the whole of the labour and, unless otherwise indicated, all the materials

necessary to form a complete installation and such tests, adjustments and commissioning as are prescribed in subsequent clauses and as may otherwise be required to give an effective working installation to the satisfaction of the Consultant.

1.01.3 The words 'complete installation' in shall mean not only the items of electrical equipment conveyed

by this specification, but all the incidental sundry components necessary for the complete execution of the works and for the proper operation of the installation, whether or not these sundry components are mentioned in detail in the tender documents issued in connection with the contract.

1.01.4 Unless otherwise indicated work external to buildings shall include the supply and installation of:

sand or sieved earth for cable bedding and cover; cable warning covers, cable warning tapes and cable markers; poles; seatings for AGL luminaires in paving or concrete.

1.01.5 Unless otherwise indicated the following will be carried out by others: Trenching, hole digging and

backfilling; duct laying and construction of cable draw pits; building work. 1.01.6 Drawings and documents shall be provided in accordance with the requirements of the section on:

DRAWINGS AND DOCUMENTS. 1.01.7 Adequate protection of equipment during transit shall be provided by manufacturers and the

Contractor shall ensure adequate protection on site. The Contractor shall advise the Consultant of any damage that occurs to equipment including finishes and shall carry out repairs as directed by the Consultant.

1 02 Related Documents 1.02.1 Related documents will be enumerated in the invitation to tender or in the appendix to the ‘particular

clauses'. They will include the conditions of contract, particular clauses and any supplementary specifications, schedules and drawings that relate to the contract.

1.02. If any discrepancy is found between this specification and the related documents, regulations or

standards, the appropriate officer shall be informed. 1.03 Definitions 1.03.1 The definitions in the IEE Wiring Regulations apply throughout this specification.

1.03.2 Where work is undertaken as a sub-contract, 'Contractor' shall mean 'Sub-Contractor'.

1.03.3 The words 'as indicated', 'where indicated', 'unless otherwise indicated', refer to items or requirements indicated elsewhere in the tender documents issued in connection with the contract.


1.04 Regulations 1.04.1 Each installation shall comply with all relevant statutory instruments and regulations including the

following:

'Regulations for Electrical Installations' issued by the Institution of Electrical Engineers, including all the Appendices contained therein, and referred to herein as the "IEE Wiring Regulations"

Regulations and requirements of the Power Holding Corporation of Nigeria (PHCN)

1.0 Standards

1.05.1 The complete installation, shall comply with all relevant British Standards, British Standard Codes of Practice and, where indicated, with other Standards and Specifications, and all amendments thereto. The relevant issues shall be those current three months before the date for return of tender, unless alternative dates are indicated.

1.05.2 Where practicable, each item of equipment shall be clearly and indelibly marked to indicate the

standard with which it complies. Alternatively a certificate of compliance shall be provided. 1.05.3 Where equipment or services are indicated to be manufactured or provided under a particular

certification, licencing or quality assurance scheme, the manufacturer or supplier shall be a current participant in the relevant scheme. A certificate of compliance shall be provided.

1.05.4 Equipment not manufactured in the United Kingdom shall be of a standard which ensures its

compliance with all appropriate British Standards. 1.06 Approval 1.06.1 The Consultant’s approval shall not relieve the Contractor of his contractual responsibilities and

obligations. The Contractor shall be responsible for discrepancies, errors or omissions on drawings or other documentation supplied by him, whether they have been approved by the Consultant or not, provided such discrepancies, errors or omissions are not due to incorrect information given in writing by the Consultant. The Contractor shall be responsible for ensuring that equipment complies with the specified requirements.


2. TECHNICAL SPECIFICATIONS: POWER DISTRIBUTION EQUIPMENT 2.01 Electrical Characteristics of Factory Built Assemblies 2.01.1 The electrical characteristics of component parts of factory built assemblies shall be as indicated

and shall apply when the components are mounted in their enclosures, appropriate derating factors having been allowed for the effect of the enclosures, other components and interconnections.

2.02 Enclosures of Factory Built Assemblies 2.02.1 Unless otherwise indicated enclosures shall provide a minimum degree of protection of IP21 when

located within buildings and IP43,'when located outside buildings. 2.02.2 Doors shall have adequate fastenings with provision for locking in the closed position. Covers

requiring tools for their removal are excluded from this requirement. 2.02.3 Fixing holes for equipment inside buildings may be inside or outside the enclosure. Equipment to be

located outside buildings shall have fixing lugs external to the enclosure. 2.02.4 Earthing terminals shall be fitted to each enclosure, suitable for internal and external connection, to

enable the exposed conductive parts of the factory built assembly to be connected to a protective conductor. Where the enclosure has a painted finish provision shall be made for the earthing terminal to be electrically connected to the enclosure without the need to remove any paint from ferrous metal.

2.02.5 Cable terminals shall be suitable for the number, size and type of cables as indicated. Adequate

spacing shall be allowed for spreading of cable tails to avoid stress on the insulation or terminals; if necessary, extension boxes shall be fitted to standard enclosures. Terminals for neutral conductors for the three phase and neutral circuits shall be the same size as for the phase conductor, except where reduced section neutral cable cores are indicated.

2.02.6 Gland plates shall be provided for all multi-core cables of35mm2 cross section and larger. For all

sizes of single-core cables non-ferrous gland plates shall be provided, and there shall be a clearance of not less than 25mm between cable glands and ferrous metal.

2.02.7 Metallic enclosures for location within buildings shall have a stove dried painted finish, of the

manufacturer's standard colour, unless otherwise indicated. Ferrous parts shall be degreased and adequately rust protected immediately prior to painting.

2.02.8 Ferrous parts of enclosures located outside buildings or at other locations as indicated shall be

protected against corrosion by a hot-dip galvanised coating to BS729 or by a zinc sprayed coating to BS2569 with the manufacturer's standard finish.

2.03 Busbar Trunking Systems 2.03.1 Busbar trunking systems shall comply with BS5486 and clauses 2.01 and 2.02. They shall have a

fault withstand classification of Class 2 or 3 as indicated. 2.03.2 Busbar trunking systems shall be suitable for normal mechanical loads unless otherwise indicated,

and they shall not be used to support other equipment.


2.03.3 Feeder units shall be fitted with an isolating switch where indicated. The switch shall comply with clause 2.06.

2.03.4 Tap-off units and tap-off facilities for future units shall be provided as indicated. The phase

sequence shall be maintained along the entire length of each busbar trunking system and shall be identical in all systems in the installation. Phase colour shall be clearly marked in each trunking unit.

2.03.5 Conductors shall be of bare copper unless otherwise indicated. The neutral conductor shall be the

same size as the phase conductors unless otherwise indicated. Conductors shall be supported by high grade non-hygroscopic and non-tracking insulating material. They shall be anchored in at least one position and a means of taking up expansion and contraction incorporated.

2.03.6 Where the enclosure is of metal, trunking units shall be so joined that they form a circuit protective

conductor. In addition, where indicated, a copper strip shall be installed outside of and for the full length of the busbar trunking. The strip shall be of the size indicated and shall be bonded to an earthing terminal 'fitted to each trunking "unit forming the system and to the protective conductor of the incoming cable at the feeder unit.

2.03.7 The length of busbar trunking systems shall be determined from drawings for tender purposes, but

all measurements shall be checked on site prior to manufacture. 2.04 Distribution Boards 2.04.1 Fuseboards and miniature circuit-breaker boards shall comply with BS5486 and clauses 2.01 and

2.02. They shall have a fault withstand classification of Class 1 unless otherwise indicated. Fuses and miniature circuit-breakers shall comply with clauses 2.08 and 2.09 and shall be as indicated.

2.04.2 Fuseboards shall be fully shrouded. 2.04.3 Busbards shall be in the same position relative to their fuse carriers or mcbs for each pole. 2.04.2 In TP&N distribution boards neutral busbars shall have one outgoing terminal for each outgoing

circuit. ' . 2.04.5 A multi-terminal bar for the circuit protective conductors shall be provided for both insulated and

metal cased boards, with one terminal for each outgoing circuit. It shall be directly connected to the earthing terminal without dependence on the exposed conductive parts of the enclosure.

2.04.6 Identification of each fuseway and mcb way shall be by numbering. Identification on the neutral

busbar and protective conductor.bar shall clearly relate each terminal to its respective fuseway or mcb way.

2.04.7 Spare fuseways or mcb ways shall be provided as indicated. Where specific ratings are indicated,

fuses or mcbs shall be incorporated, otherwise the ways shall be left blank but suitable for future additions. . . . .

2.04.8 Each distribution board shall be fitted with an isolating switch complying with clause 2.06.


2.05 Consumer Units 2.05.1 Consumer units shall comply with BS5486 and clauses 2.01 and 2.02 except that the minimum

degree of protection shall be IP20. Fuses and miniature circuit-breakers shall comply with clauses 2.08 and 2.09 and together with the means of isolation shall be as indicated.

2.06 Air-Break Switches 2.06.1 Air-break switches shall comply with BS5419 and clause 2.01. They shall have an uninterrupted

rated duty, a mechanical endurance not less than those set out in Table III of BS5419 and an electrical endurance not less than ^20 of the number of no-load operating cycles corresponding to the mechanical endurance, unless otherwise indicated, and a utilisation category of AC-22 or AC-23 as indicated. Other characteristics of the equipment shall be as indicated.

2.06.2 All switches shall meet the requirements of switch-disconnectors. 2.07 Moulded-Case Circuit-Breakers 2.07.1 Moulded-case circuit-breakers (MCCBs) shall comply with BS4752 and clause 2.01. They shall

have the voltage and current ratings, rated duty, rated short-circuit breaking capacity and rated short-time withstand current as indicated.

2.07.2 MCCBs shall be of the independent manual closing air-break type, rated for an uninterrupted duty,

unless otherwise indicated. 2.07.3 Auxiliary facilities, including power closing and undervoltage releases, shall be provided only as

indicated. 2.07.4 Each MCCB shall have a facility for padlocking in the 'OFF' position. 2.07.5 Enclosures shall comply with clause 2.02. 2.08 Fuses 2.08.1 The type and current rating of fuses shall be as indicated. 2.08.2 Cartridge fuse links complying with BS1361 shall be Type I. Fuse carriers, bases and associated

parts shall also comply with BS1361. 2.08.3 Cartridge fuse links complying with BS88 shall have a fusing factor of Class Q1 unless otherwise

indicated. Motor circuit fuse, links shall be used only where indicated. Fuse carriers, bases and associated parts shall also comply with BS88.

2.09 Miniature Circuit-Breakers 2.09.1 Miniature circuit-breakers shall comply with BS3871 and clause 2.01. They shall have the voltage

and current ratings and category of duty and of the type as indicated. 2.10 Residual Current-Operated Circuit-Breakers 2.10.1 Residual current-operated circuit-breakers (RCCBs) shall comply with BS4293. The rated voltage,

rated current, rated tripping current and rated breaking capacity shall be as indicated.


2.10.2 Where indicated RCCBs shall-have electronically amplified sensors. They shall be of the

instantaneous, GDMT or fixed time delay type as indicated. 2.10.3 Where indicated RCCB shall be fitted with integral overcurrent protection. 2.11 Contactors 2.11.1 Contactors shall comply with BS5424 and clause 2.01. They shall be air-break type and have the

voltage and current ratings, type of duty, utilization category and electrical endurance as indicated. 2.11.2 Contactors shall be electromagnetic, suitable for the control arrangement as indicated. Operating

coils shall be suitable for d,c. and a rectifier shall be incorporated for a.c. control circuits, protected by low current cartridge fuses. Latch-in contactors shall be provided only where indicated.

2.11.3 Enclosures shall comply with clause 2.02. In-built isolating switches complying with clause 2.06 and selector/test switches shall be fitted, as indicated.

2.12 Framework 2.12.1 Framework for supporting electrical equipment shall be constructed from mild steel plate and strip,

cold and hot rolled steel sections or slotted angles, complying with BS1449, BS4360. BS 2994, BS 4848 and BS 4345 respectively. Metal-arc welding shall comply with BS5135.

2.12.2 Framework mounted within a building shall have a galvanised finish with a coating equivalent to and

not less than type G275 to BS2989, but manufacturers' standard finishes will be accepted for slotted angles. All metal exposed during fabrication shall be given a coat of zinc-rich paint, brushed on, and finished to match the manufacturers' finish.

2.12.3 Framework mounted outside, a building or at other locations as indicated shall be hot-dip

galvanized to BS729 or sheradize coated to BS4921. Metal exposed during fabrication shall be cleaned with a wire brush and given a coat of zinc - ruch paint, brushed on.

2.12.4 Bolts, nuts, washers and screws shall be cadmium or zinc electroplated. 2.13 Installation 2.13.1 Equipment, including associated accessories, shall be fixed independently of the wiring system. All

fixing bolts, nuts, washers, and screws shall be cadmium or zinc electroplated. 2.13.2 Single items of equipment shall be mounted 1450mm above finished floor level to the centre of the

equipment, unless otherwise indicated. Groups of equipment, other than floor standing factory built assemblies, shall be arranged so that no part of the equipment requiring access for operation or maintenance shall, be less than 500mm or more than 2000mm above finished floor level, unless otherwise indicated.

2.13.3 Equipment shall be located so that a clear working space for operation, inspection and maintenance

of not less than 1000mm shall be provided for LV equipment and 2000mm for HV equipment. In the case of cupboards which are too shallow to meet the requirement with the doors closed, equipment shall be located in the elevation area of the clear door opening.


2.13.4 The suitability of equipment to fit into the available space shall be checked before it is ordered. Where the requirements of clauses 2.13.2 or 2.13.3 are difficult to meet, the Engineer shall be informed.

2.14 Marking and Notices 2.14.1 All diagrams, charts, tables and the wording for labels and notices shall be submitted for the

approval of the Consultant before they are installed. 2.14.2 Labels on the outside of equipment enclosures shall be of laminated plastics material with black

characters on white, unless otherwise indicated. Labels shall be securely fixed by non-ferrous screws or rivets; no adhesive shall be used for fixing.

2.14.3 Characters for labels fixed on the means of isolation at the origin of each installation shall be at

least 10mm high and 1.5mm thick. On all other labels characters shall be at least 4mm high and 0.5mm thick.

2.14.4 Where there are two or more incoming supplies this shall be clearly indicated at each point of

isolation. In installations having a three phase supply, labels on single phase equipment shall indicate the phase to which they are connected.

2.15 Central Ups Systems 2.15.1 The general, central UPS system shall be the 160KVA Galaxy PW UPS manufactured by Merlin

Gering or equivalent 2.15.2 It shall have 3-phase 230/415VAC input and 3-phase output. 2.15.3 It shall come with all the following standard options: -

• On-line topology with both static and manual bypass • Microcontroller and IGBT technology • Harmonic filtering • Gradual startup • Operation on non-linear loads • High efficiency • Oversized neutral conductor • Graphic display with event logging • "Battery Monitor" • Battery "Temperature Monitor" • Diagnostics system • "Media Contact 11" auxiliary relay board

In addition it shall have the following optional features: -

• Ethernet Network Management Card • Management & Supervision Software (to be installed in computer workstations used to manage the UPS)


2.16 Dedicated Ups System for Data Center 2.16.1 The DATA CENTER shall have dedicated to it a 30KVA Galaxy PW, 3-phase in, 3-phase out UPS

system. 2.16.2 Standard and optional features shall be as with the general UPS system. In addition it shall be

installed with an Upsilon STS unit which will enable the DATA CENTER UPS draw power from 2 independent sources.

2.16.3 The two sources of power shall be: -

a. 3-phase supply from the general UPS - as the preferred source and b. 3-phase supply from the Essential-load Panel supplied by the 250KVA Generator

2.17 Dedicated Ups System For MICR Room 2.17.1 This shall be 3No. 5KVA COMET EX RT, 3-phase input, Single-phase output UPS system by Merlin

Gerin or equivalent 2.17.2 The outputs of the three UPS units shall NOT be paralleled but shall be Connected in a '3- phase'

system and distributed as such within the 'MICR' area using an appropriate 3-phase Distribution Board.


3. TECHNICAL SPECIFICATIONS: POWER DISTRIBUTION CENTRE 3.01 Cables 3.01.1 The type, size and conductor material of power cables shall be as indicated. Clauses 3.01.2 to

3.01.9 inclusive specify those which will be most commonly used. 3.01.2 Paper-insulated cables up to and including 11KV shall comply with BS6480; they shall be mass-

impregnated, non-draining, belted type. Sheaths shall be of lead for armoured cables and lead alloy for unarmoured cables.

3.01.3 Paper-insulated aluminium sheath cables up to and including 11KV shall comply with BS6480 as far

as it is applicable. 3.01.4 Paper-insulated with aluminium sheath/neutral conductor (CONSAC) 600/1000V grade cable shall

comply with BS5593. 3.01.5 Combined neutral/earth (CNE) cables up to and including 1KV, except (CONSAC) cables referred

to in clause 3.01.4, shall comply with ESI Standard 09-9 for Waveconal cable. They shall be used in TN-C-S systems only.

3.01.6 Cross-linked polyethylene (XLPE) insulated cables up to and including 11KV shall comply with EEC

Standard 502. 3.01.7 Thermosetting (XLPE) insulated cables up to and including 3.3KV shall comply with BS5467 and

BS5468. 3.01.8 Thermosetting (HEPR) insulated cables up to and including 3.3KV shall comply with BS5467 and

BS5469. 3.01.9 PVC-insulated cable up to and including 3.3KV, unarmoured and armoured with wire or aluminium

strip, shall comply with BS6346. 3.01.10 Cables complying with sections 8 and 10 may also be indicated for power distribution. 3.01.11 Reduced neutral conductors shall not be used unless indicated. 3.01.12 An oversheath or serving, of the manufacturer's standard colour, shall be provided unless

otherwise indicated. 3.01.13 Installation of cables shall comply with section 6. 3.02 Jointing and Terminating Cables 3.02.1 Joints and terminations shall comply with clauses 3.02.2 to 3.02.12 inclusive, and with clauses 3.03

to 3.09 inclusive as appropriate to the type of cable. The Engineer shall be informed where it is proposed to install joints that are not indicated.

3.02.2 The Consultant shall be given evidence that the joint or termination manufacturer has stated that the

materials to be employed are suitable for the type of cable to be jointed or terminated.


3.02.3 A cable shall not be cut until the jointing or terminating commences and the work shall proceed continuously until it is completed. All necessary precautions shall be taken to prevent damage and ingress of moisture and impurities; cable ends shall be free from moisture before jointing commences and, in the case of paper-insulated cables, a sample of paper shall" be tested for moisture. Where circumstances prevent completion the cable ends shall be sealed. In the case of lead sheathed cables this shall be by plumbing and for aluminium sheathed cables by hermetically sealing.

3.02.4 The Contractor shall employ for this work staff that are fully qualified and competent for the types of

joints and terminations to be made. 3.02.5 Core identification shall be matched at each joint without twisting or crossing of the cores. Where

numbered cores are jointed to coloured cores the system adopted shall be consistent throughout all cable runs and, on sites with existing installations, consistent with the system already in use.

3.02.6 At the last joint in an HV run where phasing-out is to be done, an over-size box shall be used to

minimize distortion of the cores; the joint shall not be made until the Engineer has witnessed and approved the phasing-out.

3.02.7 For joints in armoured cables a bonding conductor shall be connected across the armouring. A split

ferrule shall be placed under the'armouring to prevent deformation of the cable by the clamp. 3.02.8 At terminations, armouring and metal sheaths shall be connected directly to the external earthing

terminal of the equipment by a bonding conductor. For LV cables the bonding conductor shall have a cross sectional area in accordance with Table 54F of the IEE Wiring Regulations, and for HV cables it shall be as indicated. Metal sheaths of single core cables shall be bonded and earthed at one point only, as indicated; insulated glands shall be used at the open-circuit end or ends.

3.02.9 At terminations, cable tails shall be formed by separating and bringing out the cores. Each tail shall

be long enough to connect to the terminals of the equipment. 3.02.10 At the terminations of single core cables, gland plates shall comply with clause 4.02.6. For

three phase circuits the phase conductors' shall be arranged, if possible, in trefoil formation where they pass through the enclosure of equipment.

3.02.11 Core identification at terminations shall be by coloured or numbered plastic stretch or shrink

ferrules. 3.02.12 Continuity of spare cores shall be maintained at joints, and at terminations the cores shall be

connected to spare terminals. 3.03 Connecting and Terminating Conductors 3.03.1 Solder shall be used only for connecting or terminating paper-insulated cables. All other

connections and terminations shall be by means of compression fittings or mechanical clamps. 3.03.2 Cable soldering sockets shall be of correct size for the conductor without excessive clearance. 3.03.3 Compression connectors and associated dies for the compression tool shall be the correct type and

size. The tool shall be so designed that the correct compression must be applied before it can be released.


3.04 Sleeves, Tapes and Sealing Compounds 3.04.1 Sleeves shall be of the shrink type, applied cold by mechanical device or by the use of heat. They

shall provide a sufficient thickness of insulation to suit the particular application. 3.04.2 Insulating tapes used in joints and terminations shall be compactible with, and have a temperature

rating and insulating property not less than, the cable insulation. They shall comply with BS3924, but crepe paper tapes may be used for jointing paper-insulated cables.

3.04.3 Impregnated cotton tapes shall be double selvedged. 3.04.4 All tapes shall be stored in sealed containers until required. 3.04.5 Resin fillings should be, as far as is reasonably practicable, safe and without risk to health. Each

pack shall include warnings as to any hazards in its use, e.g. dermatitic or toxic properties, with details of the precautions which the user must take to minimise these.

3.04.6 Hot-pouring sealing compound shall be hard setting and comply with BS1858. Selection of the

compound shall take account of the ambient temperature of the installation as well as the characteristics of the joint. Care shall be taken to prevent voids occurring in consequence of too rapid cooling.

3.05 Jointing Paper-Insulated Cables 3.05.1 Joints shall comply with clauses 3.02, 3.03 and 3.04 and the following. 3.05.2 For lead sheath cables, joints shall be made within an assembly comprising plumbed lead or copper

sleeves enclosed in boxes. 3.05.3 For HV joints above 3.3KV, purpose-made paper tube or crepe paper tape insulation is preferred

with, for 3 phase cables, impregnated paper separators. Where these are not used, and for joints up to and including 3.3KV, the radial thickness of insulation over connectors shall be twice the radial thickness of the cable core insulation. The radial thickness of the belt insulation shall be equal to the radial thickness of the cable core insulation.

3.05.4 The outer protection boxes for lead sheathed cables shall be cast-iron split type. The minimum

thickness of compound between the inner joint sleeves and the box shall be 12mm. Mould boxes for cast resin joints need not have additional outer protection.

3.05.5 For screened cable, continuity of screening shall be maintained across the joint. 3.06 Terminating Paper-Insulated Cables 3.06.1 Terminations shall comply with clauses 3.02, 3.03 and 3.04 and the following. 3.06.2 A barrier against the ingress of moisture into the cable cores shall be formed below compound or

shrink sleeve level. For copper conductors up to and including 70mm2 the cores shall be sweated solid; for larger sizes and for aluminium conductors a ferrule shall be sweated onto each core. The tails shall be lapped with tape complying with clause 3.04, or covered with shrink type sleeves.

3.06.3 Where the cable termination is within an equipment enclosure, shrink type sleeves may be used unless otherwise indicated. At the entry to the enclosure the cable shall be supported by a bolt-on


wiping gland at which the armouring shall terminate. The cable shall be securely supported within the enclosure.

3.06.4 End dividing boxes shall be, as indicated, one of the following types:

1. Compound filled, cast-iron, split type boxes with filling holes sealed by screwed plugs or caps and with brass wiping glands and armour clamps. Top plates shall be tapped, or provided with porcelain bushings or insulators as required; tapped top outlets shall have a minimum of 10mm of thread.

2. Cast iron or fabricated steel cable boxes fitted to switchgear or transformers. 3.06.5 Pole mounted boxes for LV cables shall be cast-iron of the tier type, but shrink type sleeves may be

used subject to the approval of the Engineer. Fixing of pole mounted boxes shall not require any cutting of the pole.

3.07 Jointing and Terminating Plastic-Insulated Cables 3.07.1 Joints and terminations for cross-linked polyethylene, thermosetting and PVC-insulated cables shall

comply with clauses 3.02, 3.03 and' 3.04. 3.07.2 Unless otherwise indicated, joints shall be cast resin type and mould boxes need not have

additional outer protection. 3.07.3 Termination shall be by means of mechanical cable glands complying with BS6121. For armoured

cables the glands shall have an earth bond attachment, and for cables with conductors larger than 35mrn2 the earth termination shall be integral with the body of the gland. Glands used with aluminium armoured cables shall be of aluminium, but for all other situations they shall be of brass unless otherwise indicated.

3.07.4 Where an HV cable termination is within an equipment enclosure, shrink type or premoulded

products may be-used unless otherwise indicated. At the entry to the enclosure the cable shall be supported by a mechanical cable gland complying with clause 3.07.3. The cable shall be securely supported within the enclosure.

3.07.5 Where a termination is pole mounted, shrink type or pre-moulded products may be used subject to

the approval of the Engineer. HV cables shall additionally be fitted with sheds. 3.08 Jointing CNE Cables 3.08.1 Jointing shall comply with the clauses of this Section relevant to the type of cable. The protective

conductor shall not be broken when making a service tee-joint. 3.09 Jointing Dissimilar Cables 3.09.1 Dissimilar cables shall be jointed only where indicated or with the approval of the Engineer. 3.09.2 Jointing shall comply with clauses 3.02, 3.03 and 3.04 and shall be suitable for the two

types of cable concerned.


3.10 Stop Ends 3.10.1 The term 'STOP END' means the provision of a permanent seal in which all cores are insulated and

protected so that the cable can be energised safely.


4. TECHNICAL SPECIFICATIONS: CABLE SUPPORTS 4.01 Selection of Cable Support 4.01.1 Unless otherwise indicated, the type of cable supports used shall be selected by the Contractor to

suit the circumstances of the installation, but they shall comply with clauses 4.02 to 4.08 inclusive, and the following preferences shall be taken into account.

For horizontal runs - cable tray;

For vertical runs - cable cleats;

Where marshalling of cables occurs, e.g. at switchboards - cable racks.

4.01.2 The selection, sizing and installation of cable supports shall take account of the requirements of

Section 8. ' 4.02 Protective Finishes 4.02.1 Unless otherwise indicated, all ferrous metal for cable tray, cable racks, cable ladder, cable hangers

and their fixings and suspensions shall have a galvanised finish. 4.02.2 For general use inside buildings, the galvanised finish shall be a coating equivalent to and not less

than type G275 to BS2989, but manufacturers' standard finishes will be accepted for slotted angles. All metal exposed during fabrication shall be given a coat of zinc-rich paint, brushed on, or finished to match the manufacturer's finish.

4.02.3 For use outside buildings, in plant rooms or other locations as indicated, the finish shall be hot-dip

galvanised to BS729 or sheradize coated to BS4921. Metal exposed during fabrication shall be given a coat of zinc-rich paint, brushed on.

4.03 Cable Tray 4.03.1 Metal cable tray shall be used unless otherwise indicated and it shall comply with clause 4.02 and

4.03.2 to 4.03.8. The use of plastic cable tray will be restricted to areas having a corrosive atmosphere.

4.03.2 Cable tray shall be perforated and shall be formed from carbon steel plate complying with BS1449.

Light, medium or heavy duty cable tray shall be selected, as appropriate, to provide adequate support without sagging, or as indicated.

4.03.3 Bends, tees, risers, reducers and 4-way cross pieces shall be factory made wherever possible, and

shall be of the same material, thickness and finish as the cable tray. All bends, tees and crosspieces shall have a gusset extending at least l.0mm along each side from the point of intersection.

4.03.4 Cable tray shall be cut along a line of unperforated metal. Holes cut in cable tray for the passage of

cables shall be fitted with grommets, bushes or other lining. Cutting of cable tray shall be kept to a minimum.


4.03.5 Each length of cable tray shall be securely bolted to an adjacent length with factory made coupling plates of adequate dimensions to prevent sagging or twisting. Bolts and nuts shall be mushroom-head steel roofing type complying with BS1494. Ends of coupling bolts shall not come into contact with the cables. No welding shall be used in the joining of cable tray.

4.03.6 Where cables are laid on the cable tray they shall be secured by ties, each tie securing the cables

of only one circuit. The ties shall be of a proprietary type not requiring screws or bolts for fixing; the use of wire or similar material will not be permitted. Ties shall be spaced at not greater than 600mm along each cable, and within 100mm of each bend or set.

4.03.7 Where cable tray is installed in the vertical plane, cables shall be supported by cable cleats or, in

the case of mineral-insulated cables, saddles or clips. 4.03.8 Cable tray shall be fixed at regular intervals not exceeding 1200mm and at 225mm from bends and

intersections. A minimum clear space of 20mm shall be left behind all cable tray. 4.04 Cable Cleats 4.04.1 Cable cleats shall be made from materials which are resistant to corrosion without the need for

treatment or special finish. Plastic materials shall be non-brittle down to - 20°C. 4.04.2 Cable cleats shall be of a size such that they can be tightened down to grip the cables without

exerting undue pressure or strain on them. For vertical cables two-bolt cable cleats shall be used which shall grip the cables firmly enough to prevent them slipping.

4.04.3 The spacing of cable cleats shall comply with the IEE Wiring Regulations. At bends in the cable,

cleats shall be located immediately on each side. 4.05 Cable Racks 4.05.1 Cable racks shall comply with clause 5.02 and shall be constructed from proprietary systems using

channel sections with return lips and compatible fixing accessories; factory formed cable ladder may also be used.

4.05.2 Cables shall be fixed to the racks' and ladders by cable cleats. 4.06 Cable Hangers 4.06.1 Cable hangers shall be used only where indicated. They shall be made from mild steel flat bar

complying with clause 4.02. 4.07 Suspensions and Fixings 4.07.1 It is preferred that proprietary' suspension systems comprising channel sections with return lips and

compatible fixing accessories or slotted angles should be used. Where necessary fixing may be fabricated from mild steel flat bar. Metal arc welding shall comply with BS5135.

4.07.2 Unless otherwise indicated, fixing to the building fabric shall comply with Table 7B. 4.07.3 No shot firing shall be used and no drilling or welding of structural steelwork shall be done without

the approval of the Engineer.


4.07.4 Suspensions and fixings shall comply with clause 4.02. 4.07.5 Bolts, nuts, washers and screws shall be cadmium or zinc electroplated. 4.08 Bonding 4.08.1 Supplementary bonding shall be installed between component parts of cable trays, racks or ladders

where the method of mechanical connection does not provide permanent and reliable metal-to- metal joints of negligible impedance.

TABLE 7B : FIXING FOR CABLE SUPPORTS _____________________________________________________________________________ Building Fabric Type of fixing _____________________________________________________________________________ Structural steelwork Purpose made clamps, the type to be

approved by the Engineer Non-structural steelwork Bolts, washers and nuts Concrete, brick or building Expanding anchors blocks Timber Coach bolts ______________________________________________________________________________ NOTE: Where cable cleats are fixed direct to concrete, brick or building block, fibre plugs and screws may be used, as appropriate _________________________________________________________________________________


5. TECHNICAL SPECIFICATION: CABLE INSTALLATION 5.01 Routes 5.01.1 Unless the routes of cables are indicated on the drawings they shall be determined by the

Contractor and approved by the Consultant before work is started. 5.01.2 Cables installed on the surface shall be parallel with the lines of the building construction and

properly aligned. 5.01.3 Cables buried below ground shall, as far as practicable, follow the features of the site such as

roadways and building lines. Ducts at road crossings shall normally be at right angles to the line of the road.

5.02 Segregation 5.02.1 A minimum clearance in accordance with Table 8A shall be allowed from any equipment, pipework

or ductwork; the distance shall be measured from the external surface of any lagging. In the event of difficulty in achieving these requirements the Engineer shall be informed.

TABLE 5A: MINIMUM SPACING OF CABLES

HV LV Telephone (mm)

Co-axial (mm)

Pipework (mm)

Equipment Cable Ductwork (mm)

1. Buries: HV LV Telephone Co-axial AGL (see note 2)

50 300 300 300 300

300 25 150 150 150

300 150 50 50 150

300 150 50 50 150

300 300 200 200 200

2. In Air: HV LV Telephone Co-axial

50 300 300 300

300 (see note3) 150 150

300 150 - -

300 150 - -

300 150 100 100

NOTES: 1. The minimum spacings apply unless otherwise indicated. 2. AGL cables may be bunched together. 3. LV cables in air may be bunched subject to any requirements regarding segregation and installation

methods set out in the IEE Wiring Regulations and any requirements that may be indicated regarding grouping, installation in defined conditions or installation in enclosed trenches.

4. When cables are in steel pipes the minimum spacings need not be maintained, but a minimum

space of 25mm shall be left between the pipes.


5.02.2 Spacing between cables shall comply with Table 8A but, where indicated, account must be taken of any grouping necessary to maintain the current carrying capacities of the cables.

5.02.3 No stacking of cables on cable tray will be permitted, except for single core cables in trefoil and

control cables, unless otherwise indicated. 5.02.4 Space shall be allowed along cable routes for future additions, where indicated, and cable supports

shall be of adequate size for the ultimate load. 5.02.5 Adequate space shall be left between cable runs and the building fabric and other services to allow

for the future removal or installation of cables. 5.03 Supports and Fixings 5.03.1 Cables shall be adequately supported, by one of the methods specified in Section 7, throughout

their length except where they run through cable ducts or are buried direct in the ground. Fixing direct to the building fabric by cable cleats may be adopted for single runs subject to the approval of the Engineer, and where indicated.

5.03.2 Spacing of supports for HV cables shall comply with the cable manufacturer's recommendations. 5.03.3 Cables shall be supported within'300mm of their termination at equipment; the weight of the cable

shall not be carried by the terminal box or gland. 5.03.4 Where cables cross expansion and settlement joints in the building structure they shall be fixed

300mm each side of the joint and sufficient slack left between to allow for movement. Where the cables are buried in the building fabric suitable provision shall be made to allow for movement of the structure. The Contractor shall submit his proposals for the approval of the Engineer.

5.04 Trenching 5.04.1 Unless otherwise indicated, excavations within 600mm of existing services shall be by hand digging.

All services uncovered, whether expected or not, shall be reported immediately to the Engineer; they shall be supported by slings or other suitable means and protected. Any damage to services, however minor, shall be reported immediately to the Engineer; no repairs or replacement shall be done unless the Engineer gives his approval.

5.04.2 When cable trenches opened all cables shall be laid as quickly as possible. The Engineer's

approval shall be obtained before a trench is backfilled, but generally backfilling shall be commenced within 24 hours of cable laying and the work completed speedily.

5.04.3 Trenches shall be excavated to provide a minimum cover for cables in. accordance with Table 8B. 5.04.4 Turf and top soil shall be removed carefully and preserved for reinstatement in their original

positions. 5.04.5 Excavations shall be carried out in accordance width BS6031. Excavations shall be kept free of

water and protected against damage, or collapse. The safety of persons, and. the protection of structures, buildings, roads, sewers and services from damage shall be ensured; all necessary sheeting, timbering, strutting and shoring shall be supplied, erected, and subsequently removed.


5.04.6 Before cables are laid the bottom of the trench shall be graded evenly, cleared of loose stones and then covered for the full width of the trench with a 75mm layer of earth which has passed through a sieve with a maximum mesh of 12mm or with sieved sand. Where the level of trench bottom has to change the slope shall not be greater than 1 in 12.

5.04.7 After cables have been laid a further layer of earth or sieved sand shall be added over the full width

of the trench and tamped, to provide finally not less than 50mm cover over the cables. The earth shall have passed through a sieve with a maximum mesh of 12mm.

5.04.8 Trenches shall be backfilled in-layers and each layer shall be rammed. The first two layers shall be

100mm deep and rammed by hand; the remaining layers shall be not more than 200mm deep and power ramming may be used. Warning covers shall be included as specified in clause 5.05. Where applicable, top soil and turf shall be replaced and the final level shall be level with or not more than 25mm above the adjacent ground level.

5.05 Warning Covers 5.05.1 Warning covers shall comply with BS2484 and they shall be provided for all HV cables; for other

cables they shall be provided only where indicated. Covers shall be laid directly on the tamped sieved earth or sand that covers the cables.

5.06 Ducts 5.06.1 Cables shall be installed in cable ducts where they pass under or within 5m of railway tracks, where

they pass under roadways, where they are supported on bridges, and additionally where indicated. 5.06.2 Ducts shall be of a size suitable for the cables to be drawn-in and, if necessary in the future,

withdrawn without damage; the minimum size of bore shall be 100mm. The bore shall be smooth and entirely free from rough spots, sharp edges, imperfections and protruberances.

5.06.3 Cable ducts of vitrified clay shall comply with BS65 and shall be extra strength class. They shall be

joined with plastic flexible sleeves to provide self alignment of the bore. 5.06.4 Fibre ducts shall be heavy gauge pitch-impregnated fibre conduits complying with BS 4108, with

snap ring or taper coupling joints. 5.06.5 PVC ducts shall be unplasticized PVC pipe complying either with BS4660 or with BS3506 classes,

B,C,D or E; they shall have rubber sealing rings complying with BS249.4. PVC ducts shall not be used where the depth of cover exceeds 1m.

5.06.6 Steel tubes shall comply with BS1387 and shall have screwed socket joints and end bushes. Tubes

shall be protected against corrosion with a coat of bitumastic paint before they are installed. Tubes of 100mm bore shall be of light thickness; above this size they shall be medium thickness.


TABLE 5B: MINIMUM COVER FOR CABLES

Location and Depth of Cover

Type of Cable In open ground and under pavements (mm)

Under roadways (mm)

Under or alongside railways

In other situations (mm)

HV LV Telephone Co-axial

800 500

1000 800

1800

As indicated

5.07 Laying of Ducts 5.07.1 Unless otherwise indicated, cable ducts shall be laid at depths which comply with the requirements

of Table 8B. 5.07.2 The bottom of trenches shall be rammed to provide a flat firm bedding; where rock is present a layer

of loose soil shall be spread over the bottom and also rammed. In water-logged or unstable soil a 75mm thickness of grade 10 concrete, as defined in CP110, with 20mm aggregate shall be laid as a foundation and soil placed around and above to a depth of 75mm above the top of the duct.

5.07.3 Where cable ducts pass under, or within 5m of, railway tracks or under roadways the bottom of

trenches shall be rammed and the ducts laid on and surrounded by concrete providing a minimum cover of 150mm all round. The concrete shall be grade 20, as defined in CP110, with 20mm aggregate. At each joint in the ducts flexibility shall be maintained by forming a joint in the concrete by a 25mm thick compressible foam filler.

5.07.4 Cable ducts shall extend not less than 1000mm beyond the limit of roadways and paved areas.

They shall be at least 150mm away from gas and water pipes, drains, sewers and electrical plant. Where services cross, the clearance shall be not less than 50mm, If difficulty arises in achieving these minimum clearances the Engineer shall be informed.

5.07.5 Deflection from a straight line or variation in depth shall not exceed 1 in 30 horizontally nor 1 in 60

vertically and the cable duct shall pass the alignment tests. 5.07.6 Draw-pits shall be constructed at each change of direction and, for straight runs, at intervals not

exceeding 10m for PVC or fibre ducts and 25m for vitrified clay ducts and steel pipes. Draw-pits shall be of adequate size to enable cables to be drawn-in without damage or undue stress due to bending. The construction of draw-pits and their covers shall be as indicated.

5.07.7 Concrete shall comply with CP110 and shall be of a class suitable for the sulphate content of the

soil in accordance with Table 49 of the Code of Practice. 5.07.8 Alignment shall be proved by drawing a mandrel through each duct. The diameter of mandrels shall

be 7mm less than the bore diameter. Mandrels shall be of wood, 250mm long. 5.07.9 While cable ducts are being laid nylon draw-lines shall be threaded through each length of duct. The

draw-lines shall have a breaking strength of not less than 550N and shall be at least 4m longer than the duct run.


5.07.10 Immediately after laying, and before backfilling the trench, the ends of the cable ducts shall be sealed temporarily with hardwood plugs. Draw-lines shall be secured outside the plugs.

5.07.11 Backfilling shall be in accordance with clause 5.04.8. Where a cable duct is not used

immediately, temporary marker posts shall be installed to locate the ends of the duct and retained in position until cables are drawn in. Markers shall be white painted wooden posts 75mm x 75mm, standing not less than 600mm out of the ground.

5.07.12 Immediately before cables are drawn-in, ducts shall be cleared with a mandrel 150mm long

and having a diameter 12mm less than the bore diameter. The mandrel shall be followed by a circular wire brush with a diameter 12mm more than the bore diameter.

5.08 Handling of Cables 5.08.1 Cables shall be handled with care and every effort made to avoid damage to the cables, to other

services and to building fabric. Recommendations or instructions available from the cable manufacturers concerning the installation of cables shall be taken into account; in particular co-axial cables shall not be bent in a radius less than six times the overall diameter. Any damage shall be reported immediately to the Engineer.

5.08.2 Cable drums shall be unloaded carefully by means of either a crane or ramp and impact with the

ground shall be avoided. They shall be supported on axles and axle stands while the cable is being pulled; twisting and abrasion of the cable serving or oversheath shall be avoided.

5.08.3 Cables shall be pulled over cable rollers adequately spaced to prevent the cable being dragged

over ground or other surface. For cables pulled into thrust borings or cable ducts and for all cables exceeding 10m length, cable stockings Shall be used for hauling. Precautions shall be taken to ensure that strain is taken on the cable cores as well as the sheath and excessive strain shall be avoided.

5.08.4 Cables laid in trenches shall cross other cables only at junctions; clearances between the cables

shall be maintained at crossovers. Cables shall not be laid one above the other except where indicated.

5.08.5 Only one cable shall be pulled into each duct except for the following, which may be bunched

subject to the requirements of Table 8A and a maximum space factor of 20%: Single-core cables forming one circuit; Alarm, control, communication and monitoring cables.

Cables that are to be installed in the same duct shall be bunched together and pulled in one operation; additional cables shall not be drawn-in subsequently.

5.08.6 The ends of all cables shall be sealed during laying unless jointing or termination is carried out immediately. The sealed ends of power cables shall be marked with the letter 'A' or 'Z' to indicate the core sequence, 'A' at the end where the sequence is clockwise and 'Z' where it is anti-clockwise.

5.08.7 Jointing, terminating and sealing of cables shall comply with sections 5 and 6 as appropriate.


5.09 Sealing Ducts and Openings 5.09.1 After cables have been installed the ends of all ducts and service conduits (including spare ways)

shall be sealed. 5.09.2 Where ducts and service conduits enter buildings the seal shall form a barrier against gas, water,

oil, fire and attack by vermin. Spare ducts and service conduits shall be similarly sealed with removable material. The method of sealing shall be submitted for the Engineer's approval before work commences.

5.09.3 Fire barriers at fire-resistant structural elements, such as floors and walls, shall satisfy the

requirements of BS476 Part 8 for insulation, stability and integrity for the period of time indicated. The method shall be submitted for the Engineer's approval before work commences.

5.10 Cable Guards 5.10.1 Cable guards shall be fitted where cables are mounted at low level on walls, poles, towers or other

locations as indicated. 5.10.2 Cable guards shall be constructed from 1.6mm thick galvanised steel sheet complying with clause

4.13 and formed into a casing with external glanges for fixing to the fabric. 5.10.3 Guards shall extend to a height of 3500mm above ground or floor level for HV cables and 1500mm

for LV cables. In external locations the guards shall extend 300mm below finished ground level; they shall be protected inside and out with bitumastic paint extending from the bottom up to 150mm above finished ground level.

5.11 Marking of Cables 5.11.1 Buried cables shall be permanently identified by concrete slab markers. The markers shall be

600mm square by 100mm thick with impressed characters; they shall be made of grade 20 concrete, as defined in CP110, with 10mm aggregate. The wording shall be "HV CABLE" or "LV CABLE" as appropriate together with circuit details as indicated; in addition the word "JOINT" shall be added where appropriate. 5.11.2 Cable markers shall be installed flush with the finished ground level, on the precise line of the cable.

5.11.3 Cable markers shall be located at every point where a cable enters a building, sub-station, plinth or

distribution pillar; at each joint, change of direction, road and pathway crossing; and along the route of the cable at intervals not exceeding 45m.

5.11.4 Except where cables are buried, located in switch-rooms, in ducts and spaces designated solely for

electrical services, or have orange oversheaths, they shall be identified by adhesive bands coloured orange, complying with BS1710. The bands shall be not less than 100mm long, located at least once within each separate compartment through which the cables pass and at intervals not exceeding 12m.

5.11.5 Except where cables are buried or enclosed in conduit, trunking or ducting, they shall be

permanently identified by discs. The discs shall be of laminated plastic materials with black characters on white; characters shall be not less than 3mm high. The inscription shall indicate the nominal voltage, the designation of the load, the number and cross sectional area of the cores and the rated voltage of the cable.


5.11.6 Cable identification discs shall be attached to the cables with ties. Discs shall be located within 500mm of terminations and joints, at least once within each separate compartment through which the cables pass, and at intervals not exceeding 24m; they shall coincide with the colour bands.

5.12 Redundant Cables 5.12.1 Where indicated, redundant cables shall be stop-ended in a manner complying with clause 5.10. 5.12.2 Where cables are to be recovered they shall be cleaned and coiled on drums appropriate to the size

of cable.


6. TECHNICAL SPECIFICATIONS: WIRING SYSTEMS

A: CABLES IN CONDUIT, TRUNKING AND DUCTING 6.01. Cables 6.01.1 The type and size of cables shall be as indicated. Clauses 6.01,2 and 6.01.3 specify those which

will be used most commonly. 6.01.2 PVC-insulated non-sheathed cables shall comply with BS6004; they shall have copper conductors

unless otherwise indicated. 6.01.3 Rubber insulated non-sheathed cables shall comply with BS6007. 6.01.4 Core identification colours shall extend throughout the length of PVC-insulated cables. Core

identification for impulse clock systems shall be white, and for sound distribution or public address systems it shall be grey; for other Category 2 systems the colours shall be as indicated. Core colours for fire alarm and emergency lighting cabling shall comply with the IEE Wiring Regulations. The additional identification requirements of clause 6.12.6 shall also be met.

6.01.5 Cables shall be protected throughout their length by trunking, ducting, conduit and equipment

enclosures. Framework or partitions may be used, but only where indicated or with the approval of the Consultant.

6.02 Conduit 6.02.1 Conduit shall be steel or non-metallic as indicated, and comply with clause 6.03 or 6.04 as

appropriate. 6.02.2 Unless otherwise indicated, flexible steel conduit shall be used with steel conduit and pliable conduit

with non-metallic conduit. 6.03 Steel Conduit and Fittings 6.03.1 Unless otherwise indicated, steel conduits and fittings shall be screwed classification. 6.03.2 Unless otherwise indicated, the protection against corrosion of conduits and conduit fittings for

general use inside buildings shall be Class 2; for use outside buildings; in plant rooms, floor trenches, other locations as indicated and in floor screeds the protection shall be Class 4.

6.03.3 Adaptable and circular conduit boxes with their covers shall provide a minimum degree of protection

of IP41 when used inside buildings and IP44 when used outside buildings or at other locations as indicated.

6.03.4 When located outside buildings adaptable conduit boxes and covers shall be of grey cast-iron

construction, and circular conduit boxes and covers shall be of malleable cast-iron construction. 6.03.5 When conduit boxes are installed flush with the building fabric overlapping covers shall be fitted. 6.03.6 Flexible steel conduit for general use inside buildings shall be type A with protection against

corrosion equivalent to Class 2; for use in plant rooms and other locations as indicated the protection shall be Class 4. Adaptors shall be of the solid type.


6.04 Non-Metallic Conduit 6.04.1 Non-metallic conduit shall be rigid PVC Type A unless otherwise indicated. 6.04.2 Pliable conduits shall be type A, reinforced, unless otherwise indicated. Pliable conduit shall not be

used where the ambient temperature may exceed 60°C. 6.05 Trunking and Ducting 6.05.1 Trunking and ducting shall be of steel or insulating material as indicated, and shall comply with

clauses 6.06 or 6.07 where appropriate. 6.05.2 Trunking fitted with covers shall provide a minimum degree of protection ofIP41 when used inside

buildings. When used outside buildings, or at other locations where indicated, the minimum degree of protection shall be IP44.

6.05.3 Partitions shall be of the same material as the trunking or ducting. The gap between partitions and

trunking covers shall be a minimum to ensure that segregation of circuits is maintained. 6.05.4 Standard fittings shall be used and only where these are inadequate will site fabricated fittings be

accepted. Fittings fabricated on site shall be comparable in construction and finish with the rest of the trunking or ducting system.

6.05.5 Ends of runs shall be fitted with removable covers to permit future extension. 6.05.6 The size of trunking and ducting shall be as indicated. 6.05.7 Trunking with the cover on the side or bottom shall be fitted with removable cable retaining straps at

intervals not exceeding 1000mm. Where trunking runs vertically cables shall be supported at intervals not exceeding 5m; the method of support shall allow for future easy removal of or addition to the cables and shall be submitted for the approval of the Engineer.

6.06 Steel Trunking 6.06.1 Steel trunking shall comply with clause 8.05. Unless otherwise indicated, the protection against

corrosion for general use inside the buildings shall be Class 2; for use outside buildings, in plant rooms, floor trenches and other locations as indicated the protection shall be Class 3.

6.06.2 Bonding links shall be provided at each joint and secured by screws, nuts and shakeproof washers.

The bounding links shall make contact with the metal of the trunking or fitting, and continuity shall not depend on contact through the screws, nor on removal on site of paint finish from ferrous metal.

6.06.3 Factory made connectors shall be used at joints. 6.07 Routes and Segregation 6.07.1 Unless the routes of conduit, trunking and ducting are indicated on the drawings they shall be

determined by the Contractor and approved by the Engineer before work is started. This requirement shall apply where the conduit, trunking or duct is concealed within the building fabric as well as where they are on the surface.


6.07.2 Conduit, trunking and ducting shall be parallel with the lines of the building construction and properly aligned, except where conduit is permitted in floor screeds. Conduit buried in wall finishes shall run vertically only, unless the Engineer gives approval to deviate from this requirement.

6.07.3 A minimum clearance of 150mm shall be allowed from any equipment, pipework or ductwork; the distance shall be measured from the external surface of any lagging. In the event of difficulty in achieving this requirement the Engineer shall be informed.

6.07.4 Trunking shall be positioned so that adequate clearance is provided for access to the wiring. It is

preferred that the covers shall be on the top or sides of the trunking, but where tills is impracticable covers may be on the bottom, subject to the approval of the Engineer.

6.08 Supports and Fixings 6.08.1 Where conduit and trunking are not fixed directly to the building fabric they shall be suspended in

accordance with clause 6.07.

TABLE 9A: CONDUIT AND TRUNK1NG FIXINGS 1. Fixing of Conduit _____________________________________________________________________________________

Location Type of fixing _____________________________________________________________________________________

Floor screeds Saddles Buries in plaster or render Crampets or saddles Above false ceilings Space bar saddles Surface Distance saddles

_____________________________________________________________________________________ 2. Structural steel work Purpose made clamps, the type to be approved By the Engineer

Non-structural steelwork Set screws and nuts Concrete brick or building blocks Fibreplugs and screws

Hollow blocks and pot floors Butterfly spring toggle bolts or gravity bolts Timber Wood screws _____________________________________________________________________________________ 6.08.2 A support shall be positioned within 300mm of each bend and conduit box. Conduit boxes shall be

fixed to the fabric of the building independently of the conduit; where the conduit boxes have a minimum degree of protection ofIP44 the fixings shall not reduce that protection.

6.08.3 Conduit and trunking shall be fixed in accordance with Table 9A. No shot firing shall be used and no

drilling or welding of structural steelwork shall be done without the approval of the Engineer. 6.08.4 Screws and nuts shall be cadmium or zinc electroplated. 6.09 Installation 6.09.1 If the protective finish of any materials has been damaged, those materials shall either not be used

or any remedial work shall be approved by the Engineer before use. Conduits shall be clean and free from oil.

6.09.2 Holes in trunking shall be drilled, punched or cut by ring-saw. Trunking shall be free from sharp edges and burrs.


6.09.3 Connections between trunking and equipment shall be by screwed couplers and bushes, flanged

couplings or specially fabricated connectors. Direct attachment of steel trunking to equipment will be permitted only if cable entries are provided with bushes or grommets or other lining method approved by the Engineer. Cutting and bending the material of trunking to form flanges for connection to equipment will not be permitted.

6.09.4 At equipment not provided with screwed entries and at trunking, steel conduit shall be connected by

means of a coupler and an externally screwed bush. Bushes shall be tightened by spanners; pliers and toothed wrenches shall not be used.

6.09.5 Where trunking connects to distribution boards, cable entries shall be adequate for cabling from all

ways including spares. 6.09.6 Where a terminal block is to be accommodated in a circular conduit' box, an extension ring shall be

fitted to the box, of sufficient depth to ensure adequate space for the terminal block and cables. 6.09.7 The length of thread on the ends of steel conduit shall match that in the conduit fittings or

equipment; exposed thread will not be permitted. Running couplings with backnuts may be used with conduit having Class 2 protection, but where the projection is Class 4 only manufactured running joints will be accepted. Exposed thread on running couplings shall be given a coat of zinc-rich paint.

6.09.8 Joints between PVC conduit and fitting shall be made with a suitable adhesive, but expansion couplers shall be included.

6.09.9 Conduit shall be cold bent on site with a suitable bending tool, without deforming its cross section. 6.09.10 Draw-in conduit boxes shall be incorporated at intervals not exceeding the following:

straight run 10m; run with one or two bends 10m; run with three bends 5m; run with four bends 2.5m;

6.09.11 Unless otherwise indicated, conduit buried in concrete shall have at least 30mm depth of

cover; it shall be securely fixed to prevent movement during pouring and vibrating of the concrete. Conduit buried in plaster shall have at least 5mm depth of cover.

6.09.12 Where conduits, trunking or ducting cross expansion and settlement joints in the building

structure suitable provision shall be made to allow for movement of the structure; for trunking purpose made expansion couplings shall be used. The Contractor shall submit his proposals for the approval of the Engineer.

6.09.13 Where conduit passes through an external wall a conduit box shall be fitted on the inside of

the wall and, after wiring, filled with an inert, permanently plastic compound having a high insulation value.

6.09.14 Conduit, trunking and ducting shall be installed in screeds only where indicated or after

receipt of the Engineer's approval. Conduit boxes in floors, other than for agreed outlets, will not be permitted.


6.09.15 Flush floor trunking and underfloor ducting shall be straight and level and adjusted in height to relate to the finished floor level, as indicated.

6.09.16 Open ends of conduit and ducts shall be temporarily plugged immediately they are installed

to prevent ingress of water and solid material. Flush floor trunking and the boxes of underfloor ducting shall be fitted with temporary lids immediately they are installed, and they shall be maintained as effective protection against ingress of water and solid material until the permanent lids are fitted after screeding is complete.

6.09.17 The method to be used for fonning fire barriers at fire-resistant structural elements such as

floors and walls shall be submitted for the Engineer's approval. 6.09.18 Installed conduits and ducts shall be cleaned internally with a swab before cables are drawn-

in. 6.09.19 If the protective finish of conduit, trunking or ducting is damaged after fixing, the damage

shall be made good in a manner approved by the Engineer. 6.10 Protective Conductor 6.10.1 A protective conductor shall be drawn through non-metallic conduit, trunking and ducting and non-

screwed metallic conduit. 6.10.2 In kitchens, rooms containing a fixed bath or shower, or in other particular locations as indicated,

where steel conduit, trunking or ducting is used, a separate protective conductor shall be installed throughout, connected to an earthing terminal in each conduit box. Each section of trunking shall be bonded to the protection conductor. Nothwithstanding the provision of a separate protective conductor the continuity of the conduit, trunking and ducting shall be to the same standard as though they were the sole protective conductors.

6.10.3 Where-live conductors terminate at, or loop into terminals adjacent to an appliance or accessory the

protective conductor shall be similarly terminated. 6.10.4 A protective conductor shall be installed within each length of flexible steel conduit and connected

to an earthing terminal at each end of the flexible conduit. 6.10.5 Where a socket outlet or other accessory is mounted on the lid of steel trunking, its earthing

terminal shall be- connected by a separate protective conductor to an earthing terminal incorporated in the fixed part of the trunking.

6.11 Wiring 6.11.1 No wiring shall be carried out until the appropriate tests required in clause 16.06.2 have been done

and the Engineer has given his clearance for wiring to commence. 6.11.2 A loop-in form of wiring shall be used as far as practicable or unless otherwise indicated. Joints in

conductors shall be made using insulated terminal blocks complying with the requirements of clause 11.21.

6.11.3 At expansion joints adequate slack shall be left in the cables.


6.11.4 Where conduits are installed for wiring by others, a draw-wire shall be provided between each draw-in position.

6.11.5 Where three-phase circuits comprising single-core cables are installed in trunking. all cable? of a

circuit shall be tied together at intervals not exceeding 2000mm. 6.11.6 Cables forming part of alarm, control, communication or monitoring circuits shall have identification

sleeves at their terminations. Identification shall be consistent with the relevant wiring diagrams. B: MULTI-CORE SHEATHED CABLES 6.12 CABLES 6.12.1 Cables shall comply with BS" 6004; for LV circuits in accordance "with Table 5, for ELV circuits in

accordance with Table 4. Cables shall have copper conductors, unless otherwise indicated, and the size shall be as indicated.

6.12.2 The colour identification of cores shall comply with the IEE Wiring Regulations for all categories of

circuits and, for live conductors, the identification shall extend throughout the length of the cables. The additional identification requirements of clause 6.04.13 shall also be met.

6.13 BOXES 6.13.1 Joint boxes shall comply with BS 4662 or BS 5733 and where they are of insulating material the

material shall have the ignitability characteristic `P' as specified in BS 476. Where terminals are not integral, insulated terminal blocks complying with the requirements of clause 12.21 shall be used.

6.13.2 Boxes for accessories shall comply with the requirements of clause 12.01. 6.14 ROUTES AND SEGREGATION 6.14.1 Unless the routes of cables are indicated on the drawings, they shall be determined by the

Contractor and approved by the contractor before work is started. Cables shall be concealed within the fabric of the buildings or fixed to the surface of walls and ceilings as indicated,

6.14.2 Cables shall be parallel with the lines of the building construction and properly aligned. Cables

passing through joists shall be as nearly as practicable at right angles to them and at a distance not greater than 450mm from a load bearing wall, beam or similar support. Cables buried in wall, beam or similar support. Cables buried in wall finishes shall run vertically only, unless the engineers gives approval to deviate from this requirement.

6.14.3 A minimum clearance of 150mm shall be allowed from any equipment, pipework or ductwork; the

distance shall be measured from the external surface of any lagging. In the event of difficulty in achieving these requirements the engineer shall be informed.

6.15 Cables for alarm, control, communication or monitoring systems shall be fixed by saddles of nylon

or other suitable plastics material. 6.15.2 Cables buried in wall finishes shall be protected throughout the length that is buried by rigid PVC

conduit. Normally the conduit shall be non-circular but where appropriate the tubular form type A may be used.


6.15.3 Cables passing through walls or buried in concrete, including floor screeds, shall be protected throughout the length that is buried by rigid PVC conduit, tubular form type A.

6.15.4 Unless otherwise indicated, conduit buried in concrete shall have at least 30mm depth of cover.

Conduit buried in plaster shall have at least 5mm depth of cover. 6.15.5 Where conduits cross expansion and settlement joints in the building structure suitable provision

shall be made to allow for movement of the structure. The Contractor shall submit his proposals for the approval of the engineer.

6.15.6 Conduits entering voids shall terminate not less than 25mm clear of the building fabric. Open ends

of conduit shall be temporarily plugged immediately they are installed, to prevent ingress of water and solid material.

6.15.7 Where cables pass through joists the number and size of holes shall allow for easy withdrawal and

replacement of cables. The diameter of holes shall not exceed l/6th of the depth of the joints; they shall be approximately on the centre line and shall be not less than 75mm between centres. Joists shall not be notched.

6.15.5 The method to be used for forming fire barriers at fire-resistant structural elements such as floors

and walls shall be submitted for the engineer's approval. 6.15.9 Where cables enter a metal enclosure they shall be protected by grommets or secured by cable

clamps. 6.15.10 Cables shall be looped between outlet points and, as far as practicable, intermediate joints

shall not be used. 6.15.11 Where joints are unaboidable they shall be enclosed in boxes. Where boxes are installed

below floors, traps shall be provided for permanent access. No joints shall be places in concrete floors.


7.0 TECHNICAL SPECIFICATION: EARTHING 7.01 Earth Electrodes 7.01.1 The type and number of earth electrodes shall be as indicated and shall comply with clauses 7.01.2

to 7.01.5 as appropriate. 7.01.2 Unless otherwise indicated, earth rods shall be 15mm nominal diameter extensible copper-clad

high-tensile steel rods connected together. Copper cladding shall be molecularly bonded to the steel and shall be not less than 0.25mm thick. Driving heads shall be of high-tensile steel. Rods shall be connected by screwed joints by one of the following methods: threads shall be roll-formed with a minimum thickness of 0.05mm copper in the roots of the thread, couplers shall be of high strength silicon-aluminium bronze alloy and the threads shall be counterbored at the ends so that the couplers completely enclose the threads on the rods; the ends of the rods shall be internally threaded; couplers shall comprise a copper ferrule with the phosphor-bronze coupler screw; a corrosion inhibiting paste shall be applied to the threads on rods and couplers.

7.01.3 Pipe electrodes shall be of flanged pipe complying with BS2035 or BS4622, 150mm bore and

3000mm long. Pipe to BS2035 shall be shot-blasted to remove all scale and rust. 7.01.4 Unless otherwise indicated, earth plates shall be 600mm x 600mm minimum, of solid or lattice

copper not less than 3mm thick. 7.01.5 Where the earth electrodes are formed with tape, the tape shall be to BS1432, of the size, length,

depth below ground level and layout as indicated. 7.02 Conductors 7.02.1 Earthing conductors, main earthing bars and main equipotential bonding conductors shall be of the

type, size and conductor material as indicated, and shall comply with clauses 7.02.2 to 7.02.4 as appropriate.

7.02.2 Tapes shall comply with BS1432. Where used to interconnect copper electrodes the tape may be

bare, but for interconnecting pipe electrodes and for all other purposes the tape shall have an extruded PVC sheath.

7.02.3 Main earthing bars shall comply with BS1433 and shall be bare. 7.02.4 Cables shall comply with BS6004, Table 1, without sheath, unless otherwise indicated. 7.03 Joints and Connections 7.03.1 Joints in conductors shall be kept to a minimum. 7.03.2 All contact surfaces shall be thoroughly cleaned and coated with an anti-corrosive electrical jointing

compound suitable for the conductor materials. For bi-metallic joints a separate abrasive shall be used to clean each metal.

7.03.3 Connections shall be made as follows:


to main earthing bars by phosphor-bronze set-screws and nuts; to earth rods by bronze, gunmetal or copper clamps with phosphor-bronze bolts'; edges of clamps shall be rounded; to earth pipes by phosphor-bronze bolts and nuts, direct to the flange of the pipe;

to earth places by bolting, riveting or welding.

7.03.4 Termination of cables shall be by connectors jointed to the cable conductor by the thermit welding

process or by compression joints complying with BS4579 and clause 5.03.3. 7.03.5 Joints which are indicated as test points shall be bolted or clamped. Joints in tape, other than at test

points, shall be made by the thermit welding process or by riveting and sweating. Overlap of conductors shall be not less than 100mm.

7.03.6 Joints arid connections shall be protected by a coating which will form a seal and exclude moisture

in all weather conditions. At connections to earth electrodes the coating shall cover all exposed conductors and, in the case of earth pipes, the top surface of the flanges. Protective coatings shall be of a waterproof, inert, tenacious material and of one of the following forms:

solvent cutback thixotropic corrosion preventative forming a film of resilient matt petroleum wax; a fast drying durable rubberised sprayed coating; a heat-shrink clear sheathing.

7.03.7 Bolts, screws, nuts, washers and rivets for copper conductors shall be of phosphor-bronze, naval

brass or copper-silicon; for aluminium conductors they shall be of stainless steel. The minimum provision shall be:

for flat strip-two M8 bolts or four 5mm diameter rivets;

for sheet metal-two M8 bolts; where the sheet metal is less than 2mm thick it shall be backed for an area of at least 1000mm2

7.04 Inspection Pits 7.04.1 Unless otherwise indicated, connection between an earth conductor and its associated earth

electrode system shall be in an enclosure. 7.04.2 The enclosure shall have a removable top cover which shall be flush with finished ground level. The

enclosure shall be a purpose made concrete inspection pit, a galvanised steel inspection pit embedded in concrete, an earthenware pipe or similar, as indicated. The earth electrode connection shall be just below the lid of the inspection pit with adequate access for testing purposes.

7.05 Supports and Fixings 7.05.1 Cables shall be supported and fixed in accordance with Section 7. 7.05.2 Tapes and bars shall be fixed by spacer bar saddles which shall be of non-metallic material or

corrosion resistant alloy compatible with the conductors. Fixing of the saddles shall comply with Table 9A. The maximum spacing of fixings shall not exceed 600mm unless otherwise indicated.


7.05.3 Main earthing bars shall be supported on insulators; they shall be not less than 25mm clear of the

building fabric. 7.05.4 For general areas inside buildings, screws and nuts shall be of cadmium electroplated steel or

stainless steel; outside buildings, in plant rooms or other locations as indicated they shall be of stainless steel.

7.05.5 No shot firing shall be used and no drilling or welding of structural steelwork shall be done without

the approval of the Engineer. 7.06 Installation 7.06.1 Electrodes shall be installed in undisturbed ground. The distance between any two electrodes shall

be not less than 1.25 times the depth of the longer electrode. 7.06.2 Excavations and backfilling shall comply with clause 7.04 as appropriate. Backfill immediately

surrounding electrodes shall have a low specific resistivity and good water retention properties; it shall be well compacted and watered.

7.06.3 Where earth rods are to be installed through the base of a building, electrode seals shall be

provided. As indicated, either the rods shall be driven and the seals fitted before the concrete is poured or the seals handed to the building contractor for him to incorporate them in the slab and the rods driven at a later date. Harmful ingress of water shall be avoided when driving the rods.

7.06.4 Pipe electrodes shall be installed with the flange at the top, in 500mm diameter bored holes. 7.06.5 Earth plates shall be installed Vertically in an excavated hole, with the top of the plate at a minimum

depth of 1000mm below finished ground level; where difficulty in achieving this depth is met the Engineer shall be informed.

7.06.6 Installation of conductors shall comply with Section 8 as appropriate.


8. TECHNICAL SPECIFICATIONS: WIRING ACCESSORIES, SMALL EQUIPMENT AND

MATERIALS 8.01 Accessories-General 8.01.1 Unless otherwise indicated, accessory boxes used with steel conduit and with MICS cables shall be

metal and those used with multicored sheathed cables installed in accordance with Section 9 shall be of insulating material.

8.01.2 Where accessory boxes are of insulating material the material shall have the ignitability

characteristic 'P' as specified in BS476. 8.01.3 Accessory boxes shall be sui-table for flush or surface mounting,-as indicated. Unless otherwise

indicated, metal boxes for general use inside buildings shall be of steel with medium category of protection against corrosion; for use in plant rooms they shall be steel with heavy category of protection; and for use outside buildings and in other locations as indicated they shall be cast iron with heavy category of protection.

8.01.4 Accessory boxes shall be of adequate depth to accommodate the accessories without causing

compression of the cables. Generally boxes shall be of 35mm deep. 8.01.5 Earthing terminals shall be fixed inside each accessory box and on the grids of grid switches, The

earthing terminal of each grid shall be connected by a separate protective conductor to the earthing terminal of the box.

8.01.6 Front plates of accessories shall' be of the material and finish as indicated, but generally the finish

of various types of accessories in the same area shall match. For flush mounting the plates shall overlap the boxes; for surface mounting the plate shall match the profile of the box, without overlap.

8.01.7 Where pilot lamps are required they shall comprise a neon lamp with resistor and a red coloured

lens, unless otherwise indicated. 8.01.8 Accessories with their boxes and front plates shall provide a minimum degree of protection of IP41

when used inside buildings and IP44 when used outside buildings or at other locations where indicated.

8.01.9 Accessory boxes shall be fixed on the fabric of the building independently of the connecting cable or

conduit, as specified for conduit boxes in Table 9A. Where the accessories have a minimum degree of protection of IP44 the fixings shall not reduce that protection.

8.02 Switches 8.02.1 Switches shall be single pole unless otherwise indicated. Their current ratings shall be as indicated,

allowance being made for any inductive or capacitive load. 8.02.2 Wall mounted switches located inside buildings shall have rocker type actuating members unless

otherwise indicated. Where mounted adjacent to one another they shall be grouped in a multigang box with a common front plate.

8.02.3 Pull cord operated switches shall be fixed to white moulded plastic mounting blocks which in turn

shall be fixed to a circular conduit box; where the conduit boxes are flush with the finish the


mounting block shall overlap them. Pull cords shall be white or natural colour and the lower end shall terminate in a moulding of rubber or plastics material.

8.03 Sparkless Switches 8.03.1 Sparkless switches shall be tilting mercury type. 8.04 Dimmer Switches 8.04.1 Dimmer switches for the control of tungsten filament lamps shall comply with BS5518. For other

dimmer switches the limits and the methods of measurement of radio-frequency interference generated by the electronic assembly shall be in accordance with Table 1 and clauses 7 and 8 respectively of BS800.

8.05 Socket Outlets 8.05.1 Socket outlets shall be of the type and rating as indicated. Pilot contacts shall be provided where

indicated. 8.05.2 Socket outlets shall be switched where indicated. On socket outlets rated at 13A and located inside

buildings the switches shall be single pole and have rocker type actuating members unless otherwise indicated.

8.06 Sparkless Socket Outlets 8.06.1 Sparkless socket outlets shall be switched and of the interlocking pattern. They shall be rated at

13A unless otherwise indicated. Switches shall be tilting mercury type. 8.07 Socket Outlets for Wet Locations 8.07.1 Socket outlets shall be provided with covers which shall be screw-on. Any cover required to achieve

total enclosure and to ensure the required degree of protection against moisture shall be securely fixed to the socket outlet.

8.08 Plugs 8.08.1 Plugs shall be provided as indicated. Plug bodies shall be of metal, plastic or other material as

indicated. 8.08.2 Plugs rated at 13A shall be of a non-resilient material unless otherwise indicated. 8.08.3 Fused plugs shall be fitted with fuses rated as indicated. 8.09 Shaver Socket Outlets 8.09.1 Shaver socket outlets shall be single voltage unless otherwise indicated.


8.10 Fused Connection Units 8.10.1 Where indicated, fuse connection units shall be switched and fitted with pilot lamps. Switches shall

be double pole. Fuses shall be rated as indicated. 8.10.2 Where indicated, front plates shall incorporate a flex outlet with a clamp for anchoring the flexible

cord. 8.11 Cooker Control Units 8.11.1 Unless otherwise indicated, cooker control units shall be rated at 45A and have a 13A switched

socket outlet with pilot lights for both functions. 8.12 Telephone Cord-Outlets 8.12.1 Telephone cord-outlets shall be of a type approved by NITEL. 8.13 Time Switches 8.13.1 Unless otherwise indicated, time switches shall be self-starting, self-winding, synchronous motor

type rated at 250 volts. The motor shall be protected by a fuse which shall be easily accessible. The rated current of the switch shall be as indicated.

8.13.2 Time switches shall be of the plug-in type. 8.13.3 Unless otherwise indicated, time switches shall incorporate the following:

not less than a 30-hour spring reserve; a 24-hour dial with a single pole, single throw, switch; a da-omitting device; an ON-OFF manual switch which does not disturb the normal dial settings.

8.14 Photo-Electric Control Units 8.14.1 The sensing unit shall comprise a photo-conductive cell enclosed in a translucent plastic dome

sealed to a mounting base. 8.14.2 The control unit shall comprise a load controlling single pole switch; its rated current shall be as

indicated. 8.15 Bells and Buzzers 8.15.1 Bells and buzzers shall have contactless movements and shall not incorporate a transformer. 8.15.2 Bells gongs shall have a minimum diameter of 75mm unless otherwise indicated. 8.15.3 For bells mounted outside a building, the enclosure of the movement shall provide a minimum

degree of protection ofIP54 and shall have a tapped entry for steel conduit. 8.15.4 The base and over of buzzers shall be of plastics material. 8.15.5 Fire alarm bells shall comply with clause 13.04.


8.16 Pushes 8.16.1 Pushes shall have a current rating of 1A unless otherwise indicated and shall be suitable for flush or

surface mounting as indicated. 8.16.2 Boxes and front plates shall comply generally with clause 8.01. 8.17 Indicators 8.17.1 Indicator units for alarm or call systems shall incorporate the number of signals as indicated. 8.17.2 Enclosures shall be of metal, wood or plastics and finished as indicated. Glass front plates shall be

finished black. 8.17.3 Inscriptions shall be as indicated. 8.18 Terminal Blocks 8.18.1 Terminal blocks shall comprise connectors contained within a moulded housing. 8.18.2 Conductors shall be clamped between metal surfaces and no screws shall make direct contact with

conductors. The design shall be such as to maintain sufficient contact pressure to ensure connections of negligible impedance at all times.

8.18.3 Metal in contact with conductors shall be 85% copper alloy and any screws shall be of metal that is

electrolytically compatible with the copper alloy. The moulded housing shall be of an insulating material suitable for the maximum operating temperature of the conductors.

8.19 Mounting Heights 8.19.1 Mounting .heights shall be in accordance with Table 11A unless otherwise indicated. 8.19.2 Where difficulty in locating accessories or equipment occurs the Engineer shall be informed.


TABLE 8A: MOUNTING HEIGHTS (for accessories and equipment)

Accessories or Equipment Location or Function Height (mm) _____________________________________________________________________________________ Lighting switch 1350 _____________________________________________________________________________________ Socket outlet Location: General 200 Kitchens 1350 Above worktops 200 External 1350 _____________________________________________________________________________________ Shaver socket outlet 1350 _____________________________________________________________________________________ Connection units Controlling: Water heater 1800 Cooker control unit 1350 Cooker connection outlet 600 _____________________________________________________________________________________ Telephone outlet 200 Radio/TV outlet 200 Pushbutton 1350 Fire alarm manual call point 1350 Bell or buzzer 1900 _____________________________________________________________________________________ NOTES: 1. Heights are from finished floor level to the centre of the accessory or equipment, except in the case

of worktops when the measurement shall be from the worktop surface. 2. If the specified height of an accessory coincides with the top of tiling, the accessory shall be

mounted above the tiling, leaving a clear gap of 50mm. 3. Where apparatus is located underneath a worktop the accessory shall be mounted 100mm below

the underside of the workshop.


9. TECHNICAL SPECIFICATIONS: LUMINAIRES AND LAMPS 9.01 Luminaires 9.01.1 Luminaires shall comply with BS4533 and with clauses 14.01.2 to 14.01.8 inclusive. Emergency

lighting luminaires shall comply also with Industry Standard ICEL1001 and shall be marked with ICEL certification label.

9.01.2 Self-contained emergency lighting luminaires shall incorporate only fluorescent lamps. They shall be

fitted with a means of testing which shall comprise a push-button or similar device that cannot be left in the test position. They shall be provided with a means of isolating the lamp circuit for maintenance purposes.

9.01.3 Unless otherwise indicated, fixed luminaires shall be Class I and hand lamps shall be Class III rated

at 50 volts. 9.01.4 Unless otherwise indicated, enclosure of luminaires shall provide a minimum degree of protection of

IP20 when located within buildings and IP23 when located outside buildings, but luminaires mounted externally and less than 2m above finished ground or paved level shall be IP44.

9.01.5 Unless otherwise indicated, luminaires, both with and without built-in ballasts or transformers shall

be suitable for direct mounting on normally flammable surfaces. Emergency lighting luminaries need not comply with this requirement.

9.01.6 Where specific requirements related to flame propagation and flammability of translucent covers are

indicated, certificates of tests carried out on samples of the material shall be submitted to the Engineer. The tests shall comply with BS2782.

9.01.7 Terminal blocks for connection of the supply cables shall be adequate for the size of conductors,

forming the loop-in wiring specified in clauses 9.11.2, unless separate tails are required as in clause 9.08. Where indicated, terminal blocks shall incorporate a fuse of suitable type and rating.

9.01.8 Ballasts for tubular fluorescent lamps shall have a maximum value of harmonics complying with the

column headed "without H marking" in Table VII ofBS2818. Power factory correction shall be provided and this shall be not less than-0.85 lagging unless otherwise indicated.

9.01.9 Translucent covers and reflective surfaces shall be clean at the completion of the Works. 9.02 Lamps 9.02.1 Lamps shall be of the type and rating as indicated. 9.02.2 All lamps shall be installed by the Contractor. 9.02.3 Lamp caps shall be suitable for the lamp holders listed in Table 14A. 9.03 Lampholders 9.03.1 Lampholders shall comply with Table 12A. Other types shall be used only where indicated. 9.03.2 Bayonet lampholders in enclosed luminaires shall have the temperature rating T2.


9.03.3 Lampholders for use with flexible cords shall be of the cord-grip type. 9.03.4 Lampholders not in a luminaire shall have a shade carrier ring. 9.03.5Lampholders shall be switched only where indicated. TABLE 12A: LAMPHOLDERS ----------------------------------------------------------------------------------------------------------------------------------- Lamp Type Rating watts Lampholders ----------------------------------------------------------------------------------------------------------------------------------- Fluorescent all B-pin ----------------------------------------------------------------------------------------------------------------------------------- Tungsten up to 150 Bayonet B22d Filament 200 Edison screw E27 300 & above Edison screw E40

----------------------------------------------------------------------------------------------------------------------------------- 9.04 Ceiling Roses 9.04.1 Ceiling roses shall be of insulating material having the ignitability characteristic ‘T’ as specified in

BS476. Extension flanges shall be fitted to all surface mounted ceiling roses where the wiring installation is concealed in the building fabric.

9.04.2 Where plug-in connections are indicated 2A, three pin socket outlets and plugs shall be provided

suitable for mounting onto a circular conduit box. Where indicated, the plug shall be retained in the socket by means of a locking ring.

9.05 Pendants and Chain Suspensions 9.05.1 Luminaires shall be suspended at a height above finished floor level, measured to the lowest part of

the luminaire, as indicated. 9.05.2 A plain pendant shall comprise a-ceiling rose, flexible cord and lampholder. Unless otherwise

indicated, the flexible cord shall be 0.75mm2, the insulation shall be 85°C heat resisting PVC- insulated and the sheath shall be white. Where the lampholder has a metal exterior the flexible cord shall include a protective conductor connected to the earthing terminal of the lampholder and of the ceiling rose.

9.05.3 A tube pendant shall comprise a ball and socket cover to fit a circular box, and steel conduit not less

than 20mm diameter. At conduit entry to the luminaire a backnut shall be used. Complete pendant assemblies shall be protected against corrosion in accordance with clause 9.03.2, except where specific finishes are indicated.

9.05.4 A chain suspension shall comprise a hook cover fixed to a circular conduit box and a chain having a

load carrying capacity not less than twice the weight of the luminaire. 9.06 Supports and Fixings


9.06.1 Where fluorescent luminaires 1200mm or more in length are supported directly by the conduit system they shall be fixed to two circular conduit boxes both of which shall form an integral part of the conduit system.

9.06.2 Where the weight of a luminaire is supported by a conduit box or cable trunking the fixing of the

conduit box or trunking shall be adequate for the purpose. 9.06.3 Luminaires fitted with tungsten filament lamps and having metal backplates shall not be fixed

directly to a conduit box in which a thermoplastic material is the principal load-bearing member. 9.06.4 Support of luminaires from cable trunking shall be by means of proprietary clamps or brackets. 9.06.5 Where luminaires are supported from the structure other than by the conduit system the supports

shall comply with clause 7.07. Where luminaires are fixed direct to the structure the fixings shall be as specified in item 2 of Table 9A.

9.06.6 Luminaires mounted on or recessed into suspended ceilings shall be supported as indicated. 9.06.7 For wall mounted luminaires the mounting height shall be 1900mm above finished floor level,

measured to the centre of the conduit box. unless otherwise indicated. 9.07 Wiring Connections 9.07.1 Where luminaries, other than those covered by clause 9.08.2, are fixed direct to circular conduit

boxes or are supported by pendants or chains, the final circuit wiring shall terminate at a terminal block in the conduit box.

9.07.2 Where luminaries have fluorescent tubes are fixed direct to circular conduit boxes. The final circuit

wiring may be terminated within the luminaire unless otherwise indicated. The wiring shall enter each luminaire at the conduit entry nearest to the terminal block and, where a loop-in wiring system is used, leave by the same entry; wiring shall not pass through a luminaire unless the approval of the Engineer is given.

9.07.3 Where luminaries are mounted on or recessed into a suspended ceiling, connection shall be by

flexible cord from ceiling rose unless otherwise indicated. Ceiling rose shall be located not more than 500mm from the access in the ceiling an shall be firmly supported.

9.07.4 Cables and flexible cords for final connections to luminaires shall be suitable for the operating

temperature of the luminaire. Flexible cords for chain suspensions shall have a white sheath unless otherwise indicated; for plain pendants they shall comply with clause 9.06.2.

9.07.5 The size of final connection cables or flexible cords shall be as indicated. 9.07.6 Cables and cords passing close to a ballast within a luminaires shall be suitable for the operating

temperature of the ballast. 9.07.7 Terminal blocks, other than those forming part of the luminaires, shall comply with clause 11.18 and

the requirements of clause 9.9.6 shall be met. 9.07.8 A protective conductor shall connect the earthing terminal or earthing contact of each luminaire to

an earthing terminal incorporated in the adjacent conduit box. Where the final connection is by flexible cord the protective conductor shall form part of the cord.


10. TECHNICAL SPECIFICATIONS: LIGHTING PROTECTION 10.01 Air Terminations 10.01.1 The type and location of air terminations shall be as indicated. 10.01.2 Where indicated, metal framed or metal clad roofs or metal openings, which form part or all of

an air termination shall be bonded across joints between constituent parts. The bonding may be carried out by the specialist roofing contractor but where this is not the case the bonds shall be made as indicated; no drilling of roofing or coping shall be done without the approval of the Engineer.

10.01.3 Metalwork of structures, chimneys, pipes, cowlings, plant, walkways, handrails and similar

components of the building that are exposed at or above roof level shall be bonded to the nearest air termination.

10.01.4 Where a signal aerial is mounted on the structure it shall be protected as indicated. 10.02 Down Conductors 10.02.1 The type and location of down conductors shall be as indicated. No aluminium conductor shall

be buried in the ground. 10.02.2 Conductors connecting between a test clamp on the outside of a building and an earth

electrode, and conductors interconnecting pipe electrodes, shall be sheathed; but conductors interconnecting copper electrodes may be left bare. Conductors in other locations shall be sheathed where indicated. Sheaths shall be of PVC, extruded, shrunk-on or similarly applied! The colour shall be as indicated.

10.02.3 Where the profile of the building would cause an overhand or re-entrant loop to be formed in a

down conductor the Engineer shall be informed. 10.02.4 Metalwork, including pipework, ductwork and cables, adjacent to down conductors shall be

bonded to them unless the distance between them provides adequate isolation. The distance necessary to provide adequate isolation shall be as indicated.

10.02.5 Where the reinforcement of a concrete structure forms the down conductors, welding of the

reinforcement will be carried out by the building contractor, but the contractor shall carry out testing as described in clause 15.08.1 unless otherwise indicated.

10.02.6 Connections from down conductors formed by reinforcing steel or concrete clad steel frames will

be made by the building contractor. They will comprise stainless steel tape, not less than 20mm x 3mm, welded onto the steelwork. The Contractor shall agree with the building contractor the length of tail to be left for subsequent connection.

10.03 Joints 10.03.1 Joints in conductors shall be kept to a minimum. 10.03.2 All contact surfaces shall be thoroughly cleaned and coated with annti-corrosive electrical

jointing compound suitable for the conductor material. For bi-metallic joints a separate abrasive shall be used to clean each metal.


10.03.3 Joints between conductors of the same metal, other than at test points, shall be made by the

thermit welding process or by riveting and sweating. Overlap of conductors shall be not less than 100mm.

10.03.4 Where an aluminium conductor is jointed to a copper conductor, one of the following methods

shall be used:

a bi-metal connector formed by friction welding high purity copper and aluminium; the copper conductor shall be completely sheathed for at least 100mm of its length with metal strip electrolytically compatible with copper and aluminium, and then clamped to the aluminium conductor. Bi-metal joints shall not be made at test points nor between the test point and earth electrode.

10.03.5 A test clamp shall be provided in each down conductor; it shall be located 1m above ground level unless otherwise indicated. Test clamps shall be of cast gunmetal.

10.03.6 Bonding connections to other metal parts of the building shall be electrolytically compatible with

those metal parts. 10.03.7 Screws and rivets shall be of the following materials:

for copper conductors, phosphor bronze, naval brass or high-tensile manganese brass; for aluminium conductors, stainless steel.

10.03.8 Joints shall be protected as specified in clause 10.03.6. 10.04 Earth Electrodes 10.04.1 Earth electrodes shall comply with clause 10.01 and shall be installed in accordance with

Clause 10.06.10.04.2 Inspection pits shall be provided, in accordance with clause 10.04. 10.05 Fixings 10.05.1 Fixings shall be in accordance with Table 14A, but the Engineer's approval of the type of clips,

saddles and holdfasts to be used shall be obtained before work is started. The maximum spacings of fixings shall not exceed 900mm. No fixings shall be made into joints in masonry.

10.05.2 Saddles and holdfasts shall be of the following materials:

for copper conductors, gunmetal, aluminium-silicon bronze or naval brass; for aluminium conductors, aluminium, aluminium alloy or stainless steel.

Clips shall be either of metal as above or of outdoor grade polycarbonate or polypropylene with snap-on lids which cannot be inadvertently removed. Clips and saddles shall have rounded edges and countersunk screws. Brass components shall not be used.


10.05.3 For general areas inside buildings screws and nuts shall be of cadmium electroplated steel or stainless steel; outside buildings, in plant rooms or other locations as indicated they shall be of stainless steel.

10.05.4 No shot firing shall be used and no drilling or welding of structural steelwork shall be done

without the approval of the Engineers. Drilling and cutting of the outside fabric of the building shall be carried out only after approval has been given by the Engineer.

10.06 Bonding to Incoming Services 10.06.1 Bonding to incoming services shall be as indicated. 10.06-2 Where a service belongs to a Public Statutory Undertaker the permission of the Engineer shall

be obtained before connection is made. TABLE 104A: CONDUCTOR FIXINGS (Lightning protection)

Building Fabric Type of Fixing

1. Outside Buildings: Masonry and concrete Asphalt Metal roof and copings 2. Inside Buildings: All types of fabric

Clips or spacer saddles with nylon or plastic plugs and screws; holdfasts caulked-in; backplate holdfasts; inserts built-in to new concrete may be used. asphalt pads; purpose-made backplate holdfasts as indicated corrugated holdfasts or slate hold-fasts, as appropriate; other fixings compatible with the materials and the environment


11. TECHNICAL SPECIFICATIONS: INSPECTION AND THE TESTING 11.01 General 11.01.1 Inspection and testing shall be done in accordance with the IEE Wiring Regulations, the

requirements of this Section and as indicated. 11.01.2 Inspection shall include a physical check that all equipment has been securely fixed and

that all electrical connections are mechanically sound. 11.01.3 In addition to the test at the completion of each installation certain tests shall be done

during the progress of the Works, as required by clauses 11.04 to 11.08 inclusive and 11.14.

11.02 Information 11.02.1 For equipment supplied under the contract the Contractor shall obtain from

manufacturers the time/current characteristics of all protective devices for automatic disconnection of supply and provide copies to the Engineers and to the person or persons carrying out the inspection and testing, in addition to meeting the requirements of clause 16.05.1.

11.03 Testing Methods 11.03.1 The Engineer shall be notified of the method to be used for each type of test and the

notification shall be given not less than 28 days before the final tests ar e to be made. The tests shall be carried out in accordance with the methods set out in the IEE Wiring Regulations, subject to the requirements of clauses 11.03.2 to 11.03.5 inclusive.

11.03.2 For testing continuity of protective conductors and equipotential bonding an a.c. source

shall be used unless the Engineer agrees otherwise. 11.03.3 The method used to verify the effectiveness of the protection afforded by a residual

current-operated device shall give the operating time, and the current used shall not exceed 100% of the nominal setting of the device. For a fault-voltage operated device the test voltage between the exposed conductive part and earth shall not exceed 50 volts, hi addition to the tests simulating an appropriate fault condition any test facility incorporated in the device shall be operated to test its effectiveness.

11.03.4 High voltage tests on HV cables and, where indicated, on LV cables, factory built

assemblies and transformers shall comply with the requirements for site testing in the appropriate British Standards.

11.03.5 Alternative methods to those set out in the IEE Wiring Regulations may be proposed for

the approval of the Engineer, but they shall be not less effective than those in the Regulations.

11.03.6 Where necessary to prevent damage to components of equipment the equipment shall

be disconnected for the duration of the relevant tests.


11.04 Power Cables 11.04.1 Tests shall be made immediately on completion of the installation of power cables to

demonstrate that the phase sequence is correct at all end connections. 11.04.2 HV cables and, where indicated, LV cables shall be tested at high voltage in

accordance with clause 11.03.4 as soon as their installation is complete. 11.04.3 LV cables not required to be high voltage tested shall be tested for insulation resistance

as soon as their installation is complete. The rest voltage shall be 500V d.c. for installations rated up to 500V and 1000V d.c. for installations rated up to 1000V. Tests shall cover all permutations between each conductor/screen, metallic sheath, armour and earth.

11.04.4 The oversheaths of cables laid underground shall be given a voltage withstand test after

backfilling of the trenches is complete but before termination. 11.05 Alarm, Control, Communication and Monitoring Cables 11.05.1 Cables shall be tested as soon as their installation is complete to ensure that the cores

are continuous, that they have not been crossed and that the insulation resistance is satisfactory. Insulation tests shall cover all permutations between each conductor, screen, metallic sheath, armour and earth.

11.05.2 For polyethylene and dry paper-insulated communications cables the insulation

resistance for each conductor shall be not less than 1500 - L megohms, where L is the cable length in kilometres. The measured resistance of each conductor shall not exceed the calculated resistance by more than 5%; the calculated value will be made available by the Engineer.

11.05.3 Where repairs or extensions are made to dry paper-insulated cables, gas pressure tests

shall be made. 11.06 Conduit and Trunking 11.06.1 Where conduit is cast in-situ in reinforced concrete it shall be checked for freedom from

blockage and steel conduit shall be tested for electrical continuity as soon as the shuttering has been removed.

11.06.2 Steel conduit and trunking systems shall be inspected and tested before any wiring is

installed; underfloor ducting and flush floor trunking shall be inspected and tested before screeding.

11.07 Earth Electrodes 11.07.1 The resistance of each earth electrode, whether for earthing of protective conductors,

lightning protection or an electrical system, shall be checked immediately after installation of the elctrodes and the results submitted to the Engineer.


11.08 Lightning Protection 11.08.1 Where the reinforcement of a concrete structure is indicated to form the down

conductors, clause 14.02.5 refers, the electrical continuity of the welded reinforcing bars shall be tested after each pour of concrete is completed.

11.08.2 At the completion of the whole lightning protection installation it shall be inspected and

tested in accordance with CP326. 11.09 Earth Fault Loop Impedances 11.09.1 The measured earth fault loop impedance for each circuit shall-be checked against the

maximum value as indicated. Where the maximum value is exceeded the Engineer shall be informed.

11.10 Fire Detection and Alarm Systems 11.10.1 Fire alarm systems shall be inspected, tested and commissioned in accordance

with BS5839. 11.11 Potentially Explosive Atmospheres 11.11.1 Installations in potentially explosive atmospheres shall be inspected and tested in

accordance with all the relevant requirements of this Section and with the requirements of BS5345.

11.12 Records and Certificates 11.12.1 Inspection and test results shall be recorded on the forms provided by the Authority.

Two copies shall be submitted to the Engineer within 7 days of each test. 11.12.2 When all inspections and tests results are satisfactory a Completion Certificate and an

Inspection Certificate shall be given to the Engineer not later than the date of completion of the Works. The certificates shall be given in the form laid down in the IEE Wiring Regulations for electrical installations, BS5839 for fire alarm systems and BS5266 for emergency lighting systems.

11.12.3 The values of prospective short-circuit current and earth fault loop impendance at the

origin of the installation shall be recorded on the Inspection Certificates.


12.0 TELEPHONE AND INTERCOMM SYSTEM: 12.1 Preambles:

The Installation involves the Supply, Installation and Commissioning of a Digital PABX System. The equipment offered shall be capable of performing satisfactorily under the whether condition of Abuja at all times of the year. All Installations shall be carried out in accordance with the current regulations Local and International Laws as regards all aspects of this installation - earthing, interference, etc. The proceeding description is designed to inform the tenderers about the quality of the work to be done, the capacities and the location. It should nevertheless be understood that this description is not exhaustible and that the Contractor must accomplish as included in his price, without exception or reserve, all of the work that his profession requires and which is indispensable to the full completion of the projected system installation and commissioning. The Contractor can never argue that any errors or omissions can dispense him from executing the work that the rules of the profession require for correct finishing or which could lead to a request for a price adjustment. It is for the Contractor to appreciate, on site, the constraints and servitude imposed by the existing equipments for the realization of the work to be done.

12.2 SYSTEM OPERATIONS The PABX shall be digital with a wired capacity of 10 external trunk lines expandable to 25, 50 extensions. The system shall receive incoming calls, external calls, recalls, and internal calls - and automatically sorts them into different priority levels and then present them to the required stations in the order that they were received. From the affected station, these incoming calls shall either be routed to the extensions or diverted to an alternative station, or put into a holding queue. Incoming external calls and recalls shall be given top priority, and internal calls shall receive bottom priority. The PABX shall be capable of automatically selecting an open trunk line hence the possibility of inadvertently picking up an active line shall be eliminated. It shall also serve as a means of internal communication between one office and another within the terminal building. The Contractor shall note that functional capabilities assigned to extensions apart from the external access, shall vary from extension to extension, depending upon the class of personnel in the extension area. Some of the extension shall be assigned to two external access categories (which may be identical of different). The equipment shall also make it possible to prohibit certain extension from calling external numbers directly. An external caller shall have the possibility of calling directly an internal station without the attendant's assistance. The call can eventually be connected after a time-out to a predetermined extension or to the attendant, when the internal partly does not answer. The system shall allow the creation of extension that allow their user, without dialing, to be connected either immediately at off-hooking or after a time delay with the following:-


- the attendant - another extension - secretary unit.

The PABX offered shall be new; and of the latest design. It shall be capable of being adapted to changes in the national numbering systems. Adaptation by a simple software change should be envisaged.

12.3 GENERAL SELECTION AND SPECIFICATION OF EQUIPMENT:

The Contractor shall ensure that the Digital PABX consist of, but not limited to the followings:- - Central Switching assembly with power supply compartment. - Standby Battery and a static charger with Electronic regulation and telephone filter. - Main distribution frame installed in the PABX room and as described herein. - Transit Switching. - Trunk line emergency transfer. - Operator Recall. - Choice of individual trunk line. - Call waiting display. - Call waiting indication. - Programming of exchange data. - Call diversion. - Inquiry on Internal and external calls. - Push-button dialing. - Successive transfer call equipment. - Inside lines for Internal traffic. - Hold music for all the operations of hold, consultation call and transfer, both within the

system and the external network.


13.0 INTEGRATED ACCESS CONTROL, SURVEILLANCE, FIRE ALARM AND SECURITY

SYSTEMS: 13.1 General:

This system will control and monitor the different staff and visitor’s movement as well as fraudulent practices due to unauthorized access to sensitive areas. Thus; this system is expected to provide a framework that will interface with other systems to provide a network which can be centrally monitored and controlled.

13.2 Access Control:

This shall be an international brand with in – country representation and support This system uses Radio frequency identification device (RFID) technology for reader. 18.3 Surveillance:

18.4 General:

The CCTV system shall be a TCP/IP, Network based system. Standard Coaxial cables will link each Colour Camera to a Camera Server to which up to 16 Cameras can be connected. Two Camera Servers will be used for a total of 16 Cameras. The Camera Servers will in turn be connected to the Local Area Network via standard network connections with UT cables. Security staff, or any other authorized personnel, may view the CCTV images using standard network computers, located anywhere in the building and the appropriate access passwords. This shall be a 16 colour camera system mounted on walls or ceiling recessed. Cameras are housed in an aesthetically pleasing dome with mirrowed surface to disguise the orientation and direction of focus. Cameras in the executive lounges, stairs and lobbies shall be the covert which are not easily recognized. Each operator shall have independent access to the control of the cameras thus a total overview of events in the building is maintained at all times. Output of the cameras are multiplexed and recorded on computer hard disk. All scenes from the individual cameras can be simultaneously displayed on the monitor and this equipment provides audio recording with both time and date generation

13.5 CAMERA

Model DM/T-420 1/3” Colour DM/T-430 1/2” Colour

Image area 4.9mmx3.7mm 6.4mmx4.8mm


Pick-up elements 500(H) x 582 (V) pixels 1/3” IT CCD

752(H)*582 (v) pixels ½” IT CCD

Scanning System 2:1 interlace PAL V:50Hz, H: 15,625KHz

2:1 Interlace PAL V:50Hz, H:15,625KHz

Sync System Linelock, Internal Switchable Linelock, Internal Switchable

Video Output 1 Vp-p Composite Output, 75 Ohms

1 Vp-p Composite Output, 75 Ohms Y/c output

Lens mount C or CS mount C or CS mount

Resolution 330 TV lines (Horizontal) 470 TV lines (Horizontal)

Gamma Correction 0.45 0.45

Min illumination 1.5 Lux at F1.4 1.5 Lux at F1.4

S/N ratio 50 dB or better 50 dB or better

Power Source AC 230V or 24V AC (Option) AC 230V or 24V AC (Option)

Power Consumption

7.0W with AI lens 7.0 W with AI lens

Ambient -10 ~ + 50C/30 – 90% RH -10 ~ + 50C/30 – 90% RH

Dimensions 127 (L) x 65 (W) x 60 (H) mm 127 (L) x 65 (W) x 60 (H) mm

Weights 950 grams 950 grams

Shutter Control Auto: 1/50 ~ 1/10000 Sec. MES (8 mode)

Auto: 1/50 ~ 1/10000 Sec. MES (8 mode)


MES Shutter mode 1/50, 1/120, 1/250, 1/500, 1,1000, 1/2000, 1/5000, 1/12000

Backlight Compensation AES/IRIS Switch ON/OFF AES/IRIS Switch ON/OFF

Backlight Compensation

AES/IRIS Switch ON/OFF AES/IRIS Switch ON/OFF

Iris Control Video out, A1, A1-Amp Video out, A1, A1-Amp

White balance TTL Auto, Manual TTL Auto, Manual

Gain control Average AGC (ON/OFF by Jumper) Inside Camera

Average AGC (ON/OFF by Jumper) Inside Camera

Aperture Correction Horizontal and Vertical (3D) Horizontal and Vertical (3D)

SVHS (Y/C) output N/A YES

13.6 FIRE ALARM AND DETECTION SYSTEMS:

General: This shall be analogue - addressable which gives every sensor a unique identity and location. These information are clearly visible on the system's central control panel or mimic panels or at the central GENT Supervisor. Four separate (4-100p) panels are to be located in each wing of the building with repeater panels at the Gate House, service yard and raised parking. All panels are networked using a computer controlled supervisor system.

13.6.2 4:-LOOP CONTROL PANEL (GENT 3404):

Charger and Battery Cubicle: A standard 3404 control panel will provide a standby time of 24 hours with an additional full alarm load for 30 minutes. This could be extended to 72 hours of standby with an additional full alarm load for 30 minutes by adding extra batteries and a charger. The charger and batteries should be mounted adjacent to each other. The maximum distance between them and the control panel is 20 metres. - 8 x 24 Ah batteries (model No. 05795 - 02) - 1 x battery cubicle (Model No. 05906 - 06) - 1 x charger (Model No. 05216 - 24) - 1 x loop-powered interface (Model No. 34450).

Cable Length: Maximum length of cable that may be included in a loop, including sub-loops and spurs is 1Km. The cable shall be to BS 6387


Not more than 1Km cable usage per loop circuit. Not more than 2-cores. A maximum of 0.5 F intercore capacitance. A maximum of 13 Ohms per core. Each core having not less than 1.5mm2 cross section area. Have an inherent metal conduit screen for earth continuity in order to produce electrical protection and screening. Have protection from heat and mechanical damage. Cable screen must be capable of being earthed at each system device (outstation). A4 mimic cables (mimic-to remote Box) Mineral insulated copper cable (EMC compliant). 50m maximum mimic panel to remove Box cable distance.

- The cable is to BS6207 part 1. - Fire resistance tested to BS 6387 categories CWZ. - Having continuous metal sheath encapsulatation, - No more than 4-cores. - Each core having 1.5mm2 cross section area. - a red cover sheath (preferred for alarm application). - core to core capacitance 115pF /m - Core to screen capacitance 20pf/m.


MECHANICAL SERVICES SPECIFICATION

Consultant M & A ASSOCIATES


PART ONE TECHNICAL SPECIFICATIONS FOR PLUMBING INSTALLATIONS


1.1 SCOPE OF WORK (I) The Contractor's works comprise the repairs and replacement of all materials,

complete installations and testing of the Piped Services and associated installations as detailed in the Tender specifications, bill of quantities and general indicated in the Tender drawings as well as any other works which may be reasonably inferred as necessary to ensure the proper and efficient operation of the entire installation even though the same may not be specifically mentioned or indicated therein.

(ii) . All layout, materials, appliances, equipment, etc as specified shall be. provided

and hall include but not limited to the following:

- Sanitary Plumbing

(iii) Bidder for this work shall visit the site and shall carefully examine the existing conditions and also the general construction plans and specifications as the Contractor shall be required to furnish all materials and labour necessary to deliver to the Owner complete; systems installed in full accordance with the local laws, same to be finished as specified, tested and turned to the employer in perfect conditions.

(iv) Bidders shall ensure that provisions are made for the followings in their quotations:

- Manufacturer recommended Spare parts for two (2) year operation of the equipment (Part List must be provided).

- Pre-shipment Factory inspection of all major equipment by Client and Consultant's representatives.


1.2.0 SANITARY PLUMBING 1.2.1 Sanitary Appliances (i) The Contractor shall provide all install fixtures to the extent and number shown

on the drawings. All fixtures shall be of the best grade of their respective kind, free from flaws, cracks. or other imperfections and with all fittings and connections left in first class condition, properly adjusted and ready for perfect operation.

(ii) Fixtures from "blue book" (Armitage Shanks and Ideal Standard) have been selected to serve as the minimum standard required from bidders and as basis for offering acceptable alternatives.

(iii) Colours shall be white, except otherwise specified by the Architects, to match Architects colour schedule.

1.2.1.1 Water Closet (WC)

Shall be Armitage Shanks "MONTANA" Ref S3080 close-coupled wash-down WC unit in vitreous China with horizontal outlet. Push button dual flush valve cistern, 6 litres, bottom supply and internal overflow (S3873).

- Montana seat and cover (S401 0) - Domex Screw (pair) (S91 01) - Panekta Connector (S4305) -

1.2.1.2 Wash-Hand Basin (WHB)

Shall be Armitage Shanks "POTMAN" Ref S2231 Washbasin in vitreous China with single tap hole, concealed bracket with fixing clamps and centre waste bracket:

- Dimension: 500 x 420mm - Mixer shall be Piccolo 2 basin mixer with chrome plated pop-up waste (B

1984A) - Bottle trap shall be 32mm chrome plated with 75mm seal. -

1.2.1.3 Urinal Bowl

Shall be Armitage Shanks "Sanura" urinal bowl mounted on the wall (S6100) for exposed plumbing:

- Bowl material shall be vitreous China to BS 3402 - Top Inlet Spreader (S6285) - Concealed Steel hangers (S9275) - 38mm plastic dome water (8850) - Urinal Flush valve shall be schellomat type (0221069) - 38mm plastic bottle trap with 75mm seal (S8915) - Division with hangers and screw to wall (S6120)

1.2.1.4 Shower Tray Unit (SHR) Shall be Armitage Shanks “MODULA” shower tray Ref: S5892 with anti slip resistance base.


- Material shall be fireclay - Dimension: 820x820x160mm - 38mm unslotted strainer waste in chrome plate (S8726) - Shower head shall be 13mm swivel mounted (S9320A0 - Shower Mixer shall be Trevi blend, single level in chrome plate

(A4000AA) -

1.2.1.5 Cleaner Sink

Shall be Armitage Shank :BIRCH” cleaner sink in fireclay. Heavy duty sink with plain edge and hardwood pad with bucket grating.

1.2.1.8 Kitchen Sink (KS) s

Shall be “EMERALD DELUXE’ stainless steel Single Bowl, Single Drainer (SBSD) Sink with overflow and chainstay hole.

- Bowl material of 18/8’s Nickel bearing chromium stainless steel - Drainer material of F/17’s (430) chrome ferritic stainless steel (non-Nickel

bearing - Pillars taps, chrome plated high neck lever action type - Chainwaste fitting shall be 32mm slotted - 38mm sink trap chrome plated with 75mm seal - Dimension 1000x600mm -

1.2.2.0 Water Supply Pipes and Fittings

(i) Pipes and Fittings for Water Supply shall be UPVC pressure pipes suitable for drinkable water. Pipes sizes shown on the 'drawings are nominal inside diameter unless otherwise noted.

(ii) All pipe shall be cut accurately to measurement taken on site and fixed without

springing or forcing, properly clearing all windows, doors and other openings pipe nipples shall. be cut evenly, threads cleaned, burrs removed and ends reamed to full inside bore. Installations shall be in such a way to permit free expansion and contraction without' causing damage or misalignment, and to permit complete drainage of piping system. Pipe connections shall not be made smaller than equipment connections except in pipelines, openings shall be fitted with cap or plug during installation to exclude dirt and foreign materials:

(iii) Where changes in pipe sizes occur, reducing fittings properly installed in

straight line shall be used. The cut and shot method of forming bends or elbows must not be used.

(iv) Ends of pipes and recesses of fittings shall be thoroughly cleaned and smeared

with appropriate fluxes prior to solderinq or brazing. (v) Pipes shall be free from any surface injury at the time of final inspection. All

damaged pipes shall be removed and replaced with new pipes.


(vi) Runs over 15 metres (horizontally) or steel tube' pipe shall be anchored to wall or floor construction so as to allow expansion and wise or in a direction which does not produce excessive strain on the pipes.

(vii) Unions shall be used to connect the services to sanitary fitments or other

equipment and shall be installed on long runs of piping as directed to permit convenient disassembly for alterations or repairs. Unions must be accessible after building is completed.

(viii) Water piping shall be installed complete with services, connection to all fixtures,

outlets; equipment etc. sizing of pipes shall be as indicated on drawings or as specified.

(ix) Ends of pipes and tubes shall be reamed before being made up. Screwed joints

shall be made up of metal to metal and. the male thread shall be smeared with an approved non-corrosive jointing paste. No packing materials shall be used near the valves on, corresponding lines.

(x) Supply pipe to the building shall be connected to the Water main at the point to

be indicated on the layout drawing. A Sluice valve with T' handled and cast iron extension and block walls with cover shall be installed on the building's water supply main at a point near the curb line.

(xi) All fixtures, equipment or apparatus which are not equipped with an integral or

self-contained provision for overflow, shall have the overflow (feed to a turn dish' pipe) to the drainage pipe work or as otherwise indicated in contract.

1.2.2.1 Pipe Laying

The drain shall be laid in complete lengths between consecutive manholes to even gradients' and to the levels indicated on the drawings. Spigots shall be well fitted into the sockets of the previous pipe laid. Care shall be taken that there is no irregularity in the inverts of the joints. No pipe shall be laid on collars or on bricks, tiles or other temporary support. The spigot and sockets of all pipes shall 'be perfectly cleaned before being jointed. Pipes laid in injurious spoil shall be adequately protected,

1.2.2.2 Test

Prior to connection of the plumbing fixtures and before sewer connections are made, the entire waste and soil piping system of the building shall be capped or plugged and tested with water by filling to the top a vertical section of pipe 3.08m high temporarily connected to the highest point in the system, The water shall be allowed to stand for eight hours without any level drop throughout. All trenches must be opened until the completion of the test. After connection of the sewage treatment plant, all water piping and fixture shall be tested to the full water pressure.

1.2.2.3 Water Piping

Water piping run in chases in wall, above suspended ceiling or in any way concealed by structural work shall be subject to a hydrostatic test at the completion of the work and proved tight. The pressure shall be 689 or 345 kpas (100 or 50 psig) above the working pressure; whichever is greater, at the lowest point in the system for 4 hours. •.


PART TWO TECHNICAL SPEFICATIONS FOR FIRE FIGHTING SYSTEM


2.0 SCOPE OF WORK

(i) The Contractor's works comprise the supply of all materials, complete installations and testing of the Fire Fighting System and associated installations as detailed in the Tender specifications, bill of quantities and general indicated in the Tender drawings as well as any other works which may be reasonably inferred as necessary to ensure the proper and efficient operation of the entire installation even though the same may not be specifically mentioned or indicated therein.

(ii) All layout, materials, appliances, equipment, etc as specified shall be provided

and shall include Fire Fighting Appliances (iii) Bidder for this work shall visit the site and shall carefully examine the existing

conditions and also the general construction plans and specifications as the Contractor shall be required to furnish all materials and labour necessary to deliver to the Owner complete; systems installed in full accordance with the local laws, same to be finished as specified, tested and turned to the employer in perfect conditions.

(vi) Bidders shall ensure that provisions are made for the followings in their

quotations:

- Manufacturer recommended Spare parts. - Pre-shipment Factory inspection of all major equipment by Client

and Consultant's representatives.

2.4.1 Portable Fire Extinguishers 2.4.1.1 Dry Powder Chemical Make - Amerex or approved equal Capacity - 9kg

Extinguishant - ABC Dry Powder Mono-Ammonium Phosphate & Ammonium Sulphate

Class of Fire - ABC Discharge Range - 7m Filled Weight - 15.4kg Dimension (DxH) - 190x584mm

2.4.1.2 Carbon Dioxide (CO2) Make - Amerex or approved equal Capacity - 5kg

Extinguishant - Carbon Dioxide (CO2) Class of Fire - BC + Electrical Discharge Time - 3m Discharge Range - 7m Filled Weight - 11.3kg Dimension (DxH) - 190x584mm


2.4.2 Mobile Fire Extinguisher 2.4.2.1 Dry Power Chemical Make - Amerex or approved equal Capacity - 5kg

Extinguishant - ABC Dry Powder Mono-Ammonium Phosphate & Ammonium Sulphate

Class of Fire - BC + Electrical Discharge Time - 75 secs Discharge Range - 14m Filled Weight - 104kg Dimension (DxH) - 510x610x990mm

2.4.2.2 Carbon Dioxide (CO2) Make - Amerex or approved equal Capacity - 45.0kg

Extinguishant - Carbon Dioxide (CO2) Class of Fire - BC + Electrical Discharge Time - 75m Discharge Range - 14m Filled Weight - 104kg Dimension (DxH) - 725x410x1270mm

2.4.2.3 Foam (AFFF) Make - Amerex or approved equal Capacity - 45.0kg

Extinguishant - Foan (AFFF) Class of Fire - AB Discharge Time - 75 sec Discharge Range - 15m Filled Weight - 104kg Material - Body S.G. Cast iron to BS 2789 and fittings in Gunmetal Finish - Red Enamel Outlet Connection - 100mm flange to BS 4504 Table 16 Flat faced Inlet Connection - 65mm flange instantaneous male to BS 336 Construction: - In accordance with BS 5041 Part 3 Performance - Complies with BS 5041 Part 3

2.4.7 Fireman Cabinet Make - Angus or approved equal Dimension - 800mmWx1000mmHx300mmD Materials - Mild Steel Thickness - 1.2mm Installation - Wall mounted Content - 1No. Landling Valve 1No Hose Cradle 1No 64mmx30m Hose Paint Finish - Epoxy Powder Red


2.4.13

PART THREE TECHNICAL SPECIFICATIONS FOR FIRE SUPPRESSION (FM 200) SYSTEM


3.1 SCOPE OF WORK

(i) The Contractor's works comprise the supply of all materials, complete installations and testing of the Fire Suppression System (FM200) and associated installations as detailed in the Tender specifications, bill of quantities and general indicated in the Tender drawings as well as any other works which may be reasonably inferred as necessary to ensure the proper and efficient operation of the entire installation even though the same may not be specifically mentioned or indicated therein.

(ii) All layout, materials, appliances, equipment, etc as specified shall be provided and shall

include but not limited to the following: Extinguishing System Detection and Alarm System

(iii) Bidders for this work shall* visit the site and shall carefully examine the existing

conditions and also the General construction plans and specifications as the Sub-contractor shall be required to furnish all materials, labour necessary to deliver to the Client complete systems installed in full accordance with the local laws same to be finished as specified, tested and turned to the Client in perfect condition.

(iv) Bidders shall ensure that provisions are made for the followings in their

Quotations:

- Manufacturer recommended Spare parts for two (2) year operation of the equipment (Part List must be provided).

- Pre-shipment Factory inspection of all major equipment by Client and Consultant's representatives.

- Training of Client's Personnel on Operation & Maintenance Five (5) years Facility Management Proposal

3.2 Extinguishing System 3.2.1 FM 200 Container

The FM200 agent shall be sourced from Great Lakes Chemical Corporation with Proof of Purchase. The storage vessel shall consist of a container fitted with a valve and internal siphon tube factory fitted with FM 200, and super pressurized with dry nitrogen to 25 bars. Containers shall be furnished in two-pack polyethane red. Every container shall have a name plate attached to it, displaying the following information:

- Tare Weight - Gross Weight - Agent Weight - Fill Density - Charge Rate

The container shall be manufacture in accordance with BS 5045 part 2 class 1A and shall be subjected to the following tests:


- Hydraulic Test Pressure 44.0 bar - Pneumatic Test Pressure 7.0 bar - Minimum Burst Pressure (.5-55L) 7.8.2 bar - Minimum Burst Pressure (106-180L) 78.2 bar

3.2.2 Fixing Bracket

This is to secure the container in place during the system discharge. The two bracket assemblies shall be provided for each container. Each strap shall be designed for insertion into the back channel to allow the container to be properly aligned. The bracket assembly shall be arranged to be mounted to a rigid surface with the container assembly resting on the floor.

3.2.3 Valve Assembly

This shall be factory fitted to the container and shall be supplied pre-assembled with low pressure switch, pressure gauge and burst disc. Technical specifications of the valve shall be as follows: - Material - Brass CZ 121 - Body proof pressure - 150 bars

3.2.4 Burst Disc

This shall be factory fitted to the valve assembly and it shall be designed to rupture when the container becomes over pressured. Technical specifications shall be as follows:

- Body - Brass CZ 121

- Rating - 50 bars - Plug Thread - M14x1.25 - Hole Orientation - 900 to body - Tongue - 18NM 3.2.5 Low Pressure Switch

A low pressure warning switch shall be fitted to every container to continuously monitor the container pressure and in the event of a pressure drop below 17 bar it shall operate. The switch body shall be made from hemetically sealed stainless and it. shall be designed to close at above 17 bars. The proof pressure shall be 345 bars and the voltage range shall be 5-28 Vdc.

3.2.6 Manual Actuator This shall be fitted to the top of the valve assembly or solenoid actuator. It shall acts as a strike knob during operation. The body of the actuator shall be brass CZ 121 while the knob shall be made from nylon. It shall be designed for a minimum actuation force of 25.5N.


3.2.7 Pneumatic Actuator This shall be similar to the manual actuator though without strike knob. Pressure from a Master' container shall be used to actuate the valve through flexible hose. The actuator shall be made from brass CZ 121 and it shall be designed for a minimum actuation pressure of 2 bars.

3.2.8 Electric Actuator The electric actuator is also similar to the manual actuator and locates at the top of the container valve. 24vdc is required for solenoid operation. Provision shall be made for the connection of manual strike knob at the top of the actuator assembly.

3.2.9 Flexible Discharge Hose

Flexible discharge hose shall be used to connect multiple container installation to the system. This is to enable disconnection of containers for maintenance, re-charge without dismantling the container mountings, manifold connections pipework, etc. The hose shall be connected to each outlet. The hose shall be made from twin steel wire branded, oil resistant, seamless synthetic rubbers with the core manufactured to DIN 20022. The hose connection shall be zinc possivated mild steel.

3.2.10 Manifold This shall be fabricated steel pipe sections to enable multiple containers to be connected to a common pipe network. The manifold shall be made from schedule 80 steel pipe to BS 3501 and tested to pressure of 90 bar. It shall be furnished and painted ready to receive final coat of paint on site.

3.2.11 Manifold Check Valve

These are mushroom patterned valves, which fit into the manifold during discharge to prevent loss of Extinguishant, should a container have been removed. The check valves shall be factory fitted to the manifold and it shall be made of brass CZ 122.

3.2.12 Directional Valve

This shall consist of a normally closed ball valve, which opens only when a pressure from the container or remote source is applied. It shall be manufactured to a pressure switch setting of 6.80 bar and shall actuate on a constant voltage of 24vdc.

3.2.13 Pressure Valve The pressure switch shall be activated by pressure form the agent during discharge. It shall incorporate a reset button. The housing shall be made form polyester coated die cast while the body shall be of brass CZ 122. The fixing shall be of zinc possivated mild steel. The assembly shall be tested to proof pressure of 68.9 bar, maximum current of 5A and maximum voltage of 240VAC.

3.2.14 Discharge Nozzles This shall be used to distribute the agent within the protected area and they shall be sized to ensure the correct flow of agent for the risk area. The nozzles shall supplied in both 7 and 8


ports configuration to enable the achievement of 180 and 360o horizontal discharge patterns respectively, depending on the need of the risk area. The ports shall be drilled in 0.1mm increments to the specified system design. Aluminum nozzles shall be used for the installation. All nozzles shall have fitted on them dirt traps.

3.2.15 Pipe Installation for FM 200 System Generally, pipe installation shall commence at the union, elbow/manifold assembly and progress along to the discharge nozzles. The piping materials shall conform to BS 5306 part 5 section 5.1. The pipes shall be properly reamed, blown clear and smeared with appropriate solvent to remove mill varnish and cutting oil before assembly. PTFE tape shall be the only acceptable pipe sealant and must be applied to the male threads.

3.3 Detection & Alarm System The Contractor shall install a fire detection system compatible with the FM-200 extinguishing system. The system shall comprise of an alarm panel to monitor all the zones, ionization - smoke detectors, optical smoke detectors, manual call points or stations and conduit works. A combination of ionisation smoke detector and optical smoke detector are to be used to provide early detection of fire in the zones being protected. The system shall allow the double-knock principle to operate before an automatic discharge of agent is allowed. In addition, the control panel shall have a set of contacts to trip off the air-conditioning units in the event of a fire out-brake.

3.3.1 Fire Alarm Panel The fire alarm control panel shall be a wall mounted modular automatic panel comprising of conventional detection zones and extinguishing zone network as applicable for each area being served. The detector circuit shall be 2 wired and capable of accepting signals from ionization and optical smoke detectors. The panel shall incorporate status indicator devices and LED terminals. It shall incorporate manual and automatic controls with pilot indicating lamps and internal sounder. The panel shall have control switches, alarm switches, sirens and DC power supply and battery charger shall be integral with the panel. The battery shall be charger at 27 volts with limiting current at 1.5 Amps. The battery and charger shall be monitored and failure indicated by relevant LEDs. The control panel enclosure shall be in SWG mild steel, stove enameled finish, to BS.4800/08B17. The lid shall be chrome plated and cam-lock, Perspex window shall be provided to allow display to be viewed. Access to internal controls shall be only via authorized key holders. Panel should be as manufactured by HOCHOKI, UK. Provision shall be made for possible interfacing with BMS system.

3.3.2 lonisation Smoke Detectors (Apollo XP95)

Provide and install as indicated on drawings, ionisation smoke detector to detect visible and invisible by-products of fire at the earliest stage. Low radiation source of 0.7mc tested to UL217 requirement with dual chamber ionisation smoke sensor with sensitivity standards meeting BS.5445.


The detector shall incorporate LED indicator and latches on alarm and should be self-resetting on alarm. It should incorporate terminals for remote indicators. Voltage range should be compatible with that of the control panel.

3.3.3 Optical Smoke Detectors (Apollo XP95)

Provide and install as indicated optical smoke detector for detecting slowly developing fires by means of Tyndale effect incorporating an infrared emitter/sensor combined to give maximum effect. Detector should be capable of switching to an alarm condition when a predetermined level of particle presence is attained. Sensitivity setting should meet BS.5445. The detector shall incorporate LED indicator and latches on alarm. It should be compatible within voltage range of the fire alarm control panel.

3.3.4 Call Points

Provide as indicated or as appropriate manual call points. Call points shall have facilities for standard fire gas release or gas abort and should be supplied with resettable plastic element and clear lift-up flap for security and manufactured to IP66.

3.3.5 Sounder Provide 24 volts DC sounder per zone.

3.3.6 Remote Control Indicator Provide as indicated, wall mounted remote indicator wired to the control panel located outside the protected zone enable the determination of a false alarm and thus prevent accidental discharge in the event of malfunctioning of any of the detectors.

3.3.7 Bells Provide alarm bells and flashing beacon as required.

3.3.8 Control Wiring Provide as deemed necessary, all required electrical interconnecting cables of adequate size. All cables should be housed in appropriate power conduit and laid in accordance with relevant IEE Regulations and NFPA Standard wiring code of practice.

4.3.9 System Maintenance The Contractor must provide comprehensive regular maintenance for the system after expiratory period of warranty, which cannot be less than 12 months after the installation. Such comprehensive maintenance shall include leak test on cylinders and pipeworks, status report on detection system. The Contractor shall include a sum for the comprehensive maintenance at the time of tender and a programme proposal.


PART FOUR TECHNICAL SPECIFICATIONS FOR AIR-CONDITIONING SYSTEMS


4.1 DESIGN CONCEPT

The Air-conditioning system is designed using split units system to serve the offices and equipments rooms. The general layout of the concept has been shown on the tender drawings.

4.2 SCOPE OF WORK i) The contractor shall note that this specification covers the installation of all air-

conditioning and ventilation systems required for the renovation of the ADB Office complex at Maitama, Abuja, with equipment, controls, pipeworks etc as indicated on the contract drawings and as hereinafter specified.

ii) All layout, materials, equipment etc as specified shall be provided and shall include but

not limited to the following: a) Ventilating Fans b) Refrigeration pipework and insulation c) Controls d) Associated Electrical Works e) Building Management System f) Manufacturers' Recommended Spare Parts

iii) Bidders for this work shall visit the site and shall carefully examine the existing

conditions and also the General construction plans and specifications as the contractor shall be required to furnish all materials, labour necessary to deliver to the Client complete systems installed in full accordance with the local laws same to be finished as specified, tested and turned to the Client in perfect condition.

iv) Bidders shall ensure that provisions are made for the followings in their quotations:

- Manufacturer recommended Spare parts. - Pre-shipment Factory inspection of all major equipment by Client and

Consultant's representatives.

4.3 MATERIALS AND WORKMANSHIP

All materials supplied and work done shall be in accordance with the current issues of the relevant ASHRAE, British Standard Specifications, and Codes of Practice unless otherwise specified or approved. The quality of materials and the standard of workmanship shall conform with the accepted standards of good practice, and Sub-contractor shall take down and replace at his own cost any part of the installation which fails to meet the above, or any other requirements of the specification.

4.4 SAMPLES FOR APPROVAL


Where the selection of material or equipment has been left with the sub-contractor, the Engineer shall be entitled to request samples for approval.

4.5 INSPECTIONS AND TEST The Consulting Engineer shall be entitled to inspect any of the plant supplied or installed with the Contract at any stage of manufacture, and to witness any of the specified tests.

Protection and Safety Protection/Safety devices provided shall incorporate but not limited to the following: - High pressure pressostat with automatic reset. - Low pressure pressostat with automatic reset - Preventer for the avoidance of simultaneous starting of multiple Fan Motors 3

phase protector for location in their contactors - Thermal protectors for the compressors. - Sequence selector (lead lag switch) - Anti-short cycle timer.

Special IT and Clean Power cabling specifications A. Cabling base principles:

1. The trunking shall be made of 2 or 3 compartments inside

2. The floor will have Cisco Switch to which user desktops connect at 100/1000 Mbps.

3. Each workgroup has one cable that extends to the equipment room. This cable, known as the cables UTP category 6 will be used for the uplinks and all horizontal cabling requirements.

4. Each uplink will operate at 1000 Mbps. That is, each workgroup is connected to the rest of the network at 100/1000 Mb.

5. All uplinks cables on the floor will arrive at the equipment room where they will be grouped into a Cisco switch.

B. Logical Sub- Networking

ADB will define its own IP address scheme

III PASSIVE AND ACTIVE DEVICES DISPOSAL

All the passive and active devices required in the project shall be in one Rack closet:

1. Network Cabling, patch panels and terminations 2. WIFI Equipment 3. 10 KVA UPS


LAN & TELECOMS

1. LAN & TELECOMS

1.1 IT NETWORK CABLING

Required Function Required Minimal technical

compliance

Identification

Supply, installation and commissioning of all the cabling, trunking and outlets for a 1000Base T network.

UTP Cat 6

A - Each Office will be equipped with positions configured as follows

PS PSLT LT

2 RJ-45 Outlets (LAN and Phone)

2 Regulated Power Supply(UPS) outlets

1 Person office Position 1 X 2 2



Videoconference / Meeting Room Positions 1 X 3

3

Estimated number of positions

1.2 SECURED WI-FI SOLUTION

1.2.1 Wi-Fi Access Points

Required functions Minimal technical compliance

Identification

Manufacturer To be specified by bidders

Model To be specified by bidders

Quantity BASED ON DRAWING

Type Hardware

Functionalities

Light AP with centralized controller Required

Dynamic management by the WIFI controller WLAN Required

Coverage in internal space 120 m

Coverage in open space 280 m

Data Link interface 802.11b, 802.11g

WIFI Controller automatic detection protocol Broadcast, DHCP, DNS

Ports and Interfaces

Port Fast Ethernet 10/100 1

Power over Ethernet 802.3af

Radio Port 1

Integrated antenna Required


Multi direction antenna Required

Antenna efficiency 3.0 dBi

Radio

Dynamic allocation of radio channels Required

Radio Interference automatic detection and radio channels reassignment to avoid the interference

Required

Roaming between the AP and full transparency to user’s devices

Required

Multiple SSID Required

Security

Hardware encryptions acceleration AES Required

Interface 802.1x Required

Encryption algorithms WPA, WPA2, AES

EAP Interfaces PEAP, EAP-Fast, EAP-TLS

Web based guess access Required

Authentication, authorization, accounting Required

Authentication by Mac-address Required

Dynamic allocation of VLAN following the user authentication

Required

Management

Centralized management by the Controller Required

Zero-touch deployment Required

SNMP Required

Other functions to specify

1.2.2 WiFi Access Points Controller

Required functions Minimal technical compliance

Identification

Manufacturer To be specified by bidders

Model To be specified by bidders

Quantity 1

Type Hardware

Performances and architectures

WLAN centralized Architecture Required

Total number of Access Points Not less than 25

Global and dynamic radio spectrum management for all AP Required, to specify

Ports and Interfaces

Port 10/100 for management and administration Yes

L2 aggregation capacity 2 Gbps

Ethernet interface 1Gbps on copper link Required

Ethernet Interface 1Gbps on fiber link Required

Logical aggregation of several physical ports Required

VLAN

Static integration of SSID with VLAN Required

VLAN dynamic integration following user authentication Required

Support Tagging 802.1Q Required

Radio


Dynamic allocation of radio channels on all AP Required

Radio interference automatic detection and correction Required

Roaming among AP and transparent to users devices Required

Multiple SSID Required

Frequency and output power management 802.11h

QoS 802.11e

Security

Intrusion detection and blocking Required

Detection and blocking of radio hawkers Required

Support 802.1x Required

Support 802.11i Required

Encryption algorithms WPA, WPA2

Compliant to EAP protocols PEAP, EAP-Fast, EAP-TLS

Web based management for guest users Required

Authentication, authorization, accounting Required

Authentication by mac-address Required

Dynamic allocation of VLAN following user authentication Required

High Availability and Clustering

Failover physical Interface for the controller Required

Failover of the controller unit Required

Automatic switching of the AP on the active controller Required

Administration and management

SNMP Required

Automatic upgrade of AP software Required

1.3 UPS EQUIPEMENT

Basic Features Minimal technical compliance

Identification

UPS installation, programming, monitoring and maintenance 10 KVA

Rack able

Requirement

UPS will be switched to the regulated power coming from the main Regulated Power Supply equipment