Electrical_Specifications Technical Requirements 74 Pp

8/2/2019 Electrical_Specifications Technical Requirements 74 Pp

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ELECTRICAL SERVICES

SPECIFICATION

Technic a l Requi rement s


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AFCEE I raq In te r im Construc t ion Standards 2 Electrical Services

Developed in Cooperation with the University of Technology - Baghdad

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SECTION [0 ]

GENERAL REQUIREMENTS

O.1.

These technical and general specifications shall be read in conjunction with thedrawing, bill of quantities, details of equipment and/or any special specifications

attached to the bill of quantities of the project concerned. It is obligatory for the

Contractor to familiarize himself with the details and program of construction, types

of structural members, types of finishing etc. So as to achieve efficient and

effective coordination in the construction of the building and the installation of the

services. These specifications are in general of quantities or the drawings or in the

special specifications or instructions.

O.2. The climatic conditions prevailing in the site include a hot summer with temperaturereaching up to 55

0C and a winter with temperature as low as 0

0C. In addition

sandstorms may occur. All materials and equipment used in the electrical installations

should be suitable for satisfactory operation in these conditions.

O.3. The tenders submitted shall include catalogues and technical description of theequipment offered. They should indicate the type and make of the equipment and

give their characteristics, ratings, working, efficiency and other relevant details.

O.4. The workmanship shall be of the highest order. All materials and equipment suppliedand work carried out are to be the best of their respective kind. The Employer

reserves the right to order the removal and replacement without extra cost. Of any

faulty material or inferior work.

O.5. The electrical installation work must be coordinated with the building work and thework of other services. All the drawing and specifications relating to these works

shall be carefully examined and information regarding materials and equipment

supplied by others obtained from respective sources to determine the extent, type andlocation of all wiring must be determined and information passed on to the building

contractor for making necessary arrangements. Breaking of concrete, cutting and

patching of the structure shall not be allowed unless absolutely necessary and which

shall be carried out after the prior permission of the Engineer.

O.6. The installation work shall progress side by side with the building work and shall becompleted well in advance to facilitate proper finishing of the building. The

contractor shall work out his detailed program in consultation with the Engineer and

the Building Contractor.

O.7. Installation work shall be carried out under the direction and supervision of aqualified electrical engineer. Competent foremen and electricians shall be available

at the site during all working hours.O.8. Installation work and equipment shall be protected during construction work and any

damage or loss that may occur shall be made good by contractor no extra cost.

O.9. The electrical installation shall be maintained by the contractor for a period of 12months from the date of acceptance. During this period the contractor shall replace at

his own expense any material and shall rectify any fault that may develop in the

installation.


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O.10. All the works under these specifications shall fully comply with the I.E.E.Regulations for the Electrical Equipment of Buildings and any Local Regulations

that may be in force at the time.

O.11. All materials used shall conform to the relevant latest British Standard or anapproved equivalent standard. All materials shall be suitable for service in the

climatic specified.

O.12. Samples of wires , cables, conduits, boxes, switches, sockets, push bottoms andother items shall be submitted for approval prior to their installation. In some cases

where it is not possible to submit samples, catalogues may be submitted. The

catalogues should give complete description. Specifications and technical details of

the materials.

Catalogues of major items like switch boards, sub-main boards, lighting fittings,

generating set etc. shall also be submitted for approval before any of these are

ordered. The Engineer reserves the right to reject any material that he may consider

inferior or unsuitable for any reason. The installation material procured shall be

offered for inspection in their original packing before use.

O.13. Drawings : The contractor shall submit, before starting work, complete and fullydetailed working drawing (three set) prepared and signed by an approved electrical

engineer. The drawing shall show all cable and conduit runs, boxes, method of

installation, location and mounting details of all equipments. The contractor shall not

proceed with the work unless the working drawings are approved. If during the

execution of the work, any modifications or variations from working drawings

become necessary the Contractor shall get it approved by the Engineer in charge. On

completion of the work the contractor shall submit 4 copies of as built drawing

showing exact position of all electrical equipment. Manufacturers catalogues, circuit

diagrams ,and maintenance manuals of all equipments shall also be submitted on

completion of the work.

O.14. Power supply: Power supply shall be form 11Kv 50Hz feeders transformer to380Volts, 3 phase , 4 wire system by transformers located in the sub-station

building. The contractor's responsibility shall start from the installation of the

Main Switch Board in the premises unless specified otherwise.

O.15. Scope of Work: The work shall include the supply, delivery to site. Storage,installation, connection, testing and commissioning of electrical equipments,

broadly as detailed below. But not limited.

Section One: H.T Side Medium Voltage K.

Section Two: L.T. Side 0.4 K.V.

Section Three: Cables and Wires.

Section Four: Installation, Sockets , Switches.Section Five: Fixture.

Section Six: U.P.S (Uninterruptible Power Supply and

Systems Power Supply).

Section Seven : Communications

Section Eight : Security Systems and T.V Main Arial.


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Section Nine : [C.C.M.S] Control Monitoring System.

Section Ten: Stand By Generators.

Section Eleven: Elevators, Conveyers and Escalators.

Section Twelve : Earthling and Lightning Systems.

Section Thirteen: Training, Maintenance and Spare Parts.Section Fourteen: Work Shop Accessories and Tools.

Section Fifteen : Test and Certificates.

SECTION ONE

HIGH TENSION SIDE MEDIUM V OLTAGE K .V

1.1 Installation of Internal Electrical Services

1.1.1.Description of installation

Electricity supplies to the high voltage end pole will be provided by national

electricity company. Negotiation will be undertaken with [N.E.D.C] for an

11000 volt 3 phase 50Hz services terminating in a high voltage end pole which

will be supplied and install in location as shown on the drawings. The

responsibility of the contract is to supply and install link switch link fuse and

joint box and connected them by H.T. cable with H.T switch gear. The H.T

installation consist of following items but not limited.

1.1.2 One set of link switch: link fuse out door type 500 M.V.A rupturing capacity,

500A, 17Kv. 3 phase air break with operating handle and interlocking to prevent

any faulty operation between earthling switch and life points.

1.1.3 Universal end box out door type: suitable for 3x150 mm2

P.V.C insulated and

sheathed armored cable. Should be installed in end pole in away allowing

enough space so that rupturing areas will not effect the rest of materials.

1.1.4 H.T. electrical (terminal pole) will be supplied and installed by carblala

(N.E.D.C) it is proposed to be two I beams (8x0.303x0.203 meters)

1.1.5 Lightning system should be fitted on pole which include air electrode, base for

air electrode copper bare wire, clamps and earthling rod inside manhole.

1.2 11 kV Switchboard

1.2.1 General

The 11Kv switchboard shall comprise minimum 800A, 3phase air insulatedbusbars with incoming vertical isolation oil circuit breakers and outgoing vertical


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isolation oil circuit breakers and all associated equipment as shown on the

drawing.

The switchboard shall be made up of the appropriate number of unites and shall be extensible at both ends. The circuit breaker units shall comprise the fixed

portion housing busbars, current transformers , relays , instruments etc., and the

circuit breaker portion with integral carriage.

The fixed and moving portions of each oil circuit breaker equipment specifiedshall be insulated for 11kV throughout. The fixed portion shall be suitable for

suitable for accommodation an oil circuit breaker which shall have a rated short-

circuit making and breaking capacity equivalent to 500MVA at 11kV.

Voltage free auxiliary contacts shall be provided on each circuit breaker unit tallow indication open or closed on a mimic diagram of the switch panel in

the master control room as specified under section9.

The switchboard shall be supplied complete with all necessary foundation ironsand bolts, cable and boxes and all sundries to complete erection of the

switchboard.

1.2.2 Circuit Breaker

The circuit breakers shall be of the S.F.6 type and rated at 400A. Each circuit breaker shall be fitted with a spring-operated power closing

mechanism. The closing spring shall be charged by hand, the closing and tripping

being effected by means of a mechanical push. A visual mechanical indicating

device shall be provided to indicate the state of the spring and inscribed

SPRING CHARGED when the mechanism is in the condition to close the circuit

breaker, and SPRING FREE when it is in any other condition.

All auxiliary switches shall be positively driven in both directions. They shall bemounted so as to be readily accessible for maintenance and shall be designed to

facilitate inspection, cleaning and adjustment.

Interlocks according to I.E.C standard 298. Clearly labeled interlocks shall be provided to prevent:-

(a) The circuit breaker being withdrawn from or inserted into the isolatingcontacts when it is closed. Attempted isolation shall not trip a closed

circuit breaker.

(b) The closing of the circuit breaker , unless correctly located in theservice , earth or isolated positions, or unless the circuit breaker is

withdrawn from the fixed portion of the equipment.

(c) The moving portion being withdrawn or replaced unless the circuit breaker is isolated and in the appropriate position for withdrawal or

replacement.

(d) The circuit breaker being plugged in without its tank in position.(e) The circuit breaker being closed in the service position without

completing the auxiliary circuits between the fixed and movingportions.

1.2.3 Safety Shutters

Each section of busbar chamber shall be fitted with separate automatic safety

shutters which shall cover busbar and cable contact orifices when circuit

breakers are withdrawn. All shutters shall have means of locking in their closed

positions.


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1.2.4 Isolating contacts

The connections in the secondary circuits between the fixed and moving

portions of the equipment shall be by means of self-aligning contacts.

Means shall be provided for coupling the secondary circuits on the fixed portion

to those on the moving portion when the circuit breaker is isolated.

1.2.5 Protective Devices(a)Tripping Coils- The tripping coil of each circuit breaker shall be

operated from the battery specified. The circuit between the battery

and the tripping coil shall be completed by contacts on the

protective relays.

(b)Relays : - All outgoing circuit breakers shall be fitted with inversetime delay induction relays. The relay shall be 3 element type , one

element being for earth fault tripping and the other two for over-

current tripping. The relays shall be with drawable flush-mounting

with plug-in or bolted connections.

Each relay shall have a rated current of 5A and over current elements nominalcurrent settings from 50% to 200% of rated current in steps of 25%. The earth

fault elements shall have nominal current setting from 20% to 80% in steps of

10%.

Time characteristics shall be of the inverse with definite minimum time lag type ,having a variable setting scaled from zero to unity as a multiplier of the time

characteristic, and shall provide a delay of approximately 10 sec.at twice the

current setting and 2.2 sec. At 20 times the current setting.

1.2.6 Instrumentation

(a) Voltmeters : circuit breakers shall be fitted with 100mm diametermoving iron, spring controlled voltmeters, phase selector switches,

and 3 phase voltage transformers as scheduled.

(b) Ammeters : circuit breakers shall be fitted with 100mm diametermoving iron, spring controlled ammeters operated by currenttransformers as scheduled.

(c) Power Factor Meters: Incoming circuit breakers shall be fitted with100mm diameter moving iron spring controlled power factor meters

operated by current and voltage transformers as scheduled.

(d) K.W.H.M.in incoming side.1.2.7 Current Transformers

Current transformers shall be of suitable type, ratio and burden to operate

protective devices and instruments for the circuit to which they are connected.

Current transformers operating protective devices shall be in accordance with

B.S.3938: 1965 where relevant. Current transforms operating wattmetric typemeters shll be class BM and current transformers operating ammeters onle shall

be class D.

1.2.8. Voltage Transformers

Voltage transformers shall be 3 phase, oil immersed , draw-out type of suitable

ratio and burden to operate the instruments for the circuit to which they are


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connected. They shall be Class B in accordance with B.S. 3941: 1965 where

relevant . they shall have H.V.and L.V. protective fuses. The H.V. socket

orifices shall have automatic safety shutters with means of locking in the closed

position.

1.2.9 Earthing

A main external 50mm x 6mm copper earth conductor shall be fitted from end toend of the back of the switchboard. Exteral 25mm x 3mm copper earth

conductors shall be fitted connecting the steel frame of each circuit breaker and

cubicle to the main earth bar in the L.V. switchroom as specified under section

earthing system section 12. At each connection the copper tapes shall be tinned

and bolted.

External 25mm x 3mm copper tapes shall be fitted to connect the cable gland ofeach circuit to the main earth conductor.

Effective connections shall be provided on all circuit breakers and voltagetransformers to ensure earth continuity of the tanks of those items with the main

earth conductor.

A terminal shall be provided at each end of t he main earth conductor forconnection to the earth system.

All circuit breaker equipments shall be arranged so as to permit earthing ofeither the circuit side or the busbar side of the equipment. Earthing shall be

carried out by means of a device so arranged that the earth is applied through the

circuit breaker. It should be possible to fit any earthing device with all safety

shutters closed and to earth eitehr side with the safety shutters of the other side

closed. The earthing device shall have a proved short-time rating equivalent to

that of the circuit breaker equipment with which the device is to be used.

Means other than locking shall be provided to ensure that the electrical tripping ofthe circuit breaker is inoperative both during closing into and when closing in the

earthing position. It shall not be possible to return to the service position and

reclose the circuit breaker without canceling the means provided to render the

electrical tripping inoperative.

1.2.10 Testing Plugs

Portable testing plugs for insertion into the busbar-side or circuit side insolatingcontacts of circuit breaker equipments shall be provided. They shall be insulated

to withstand 20kV d.c. for 15 min. and shall be capable or carrying 200 a

continuously.

Any special items of equipment necessary for the maintenance of the switchboardshall be supplied e.g. handles for tank raising and withdrawal .

British Standards The equipment shall comply with the relevant British Standards current at the

time of tendering. Some of the British Standard having an important bearing onthe Specification are as follows:

B.S. 3938 : 1965 Current Transformers .

B.S. 3941: 1965 Voltage Transformers.

B.S. 89 : 1964 Electrical Indicating Instruments

B.S 142 : 1953 Electrical Protective Relays


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1.2.11 Tripping Equipment

A 30 volt nickel cadmium type battery adequately rated to operate the D.C.

tripping circuits of the breakers shall be supplied with the switchboard. The

battery shall be complete with floor mounting stand and a suitable trickle

charger having 220 volt A.C. single phase input.

1.3 Power Transformers

1.3.1 Description of Installation

The contractor shall supply and install the transformer in the location as shown onthe drawings. The transformer shall be rated at 1000kVA continuous rating and

connected to the High Voltage and Low Voltage switchgear by cables as shown on

the drawings.

Under normal operating conditions both transformers shall be served from the11kV switchboard oil circuit breakers and protected by overcorrect and earth fault

relays as specified under Section 4. The transformers shall each be connected to a

section of the Low Voltage switchboard. Both section of the L.V. switchboard

shall be interconnected by a bus-section circuit breaker as shown on the drawings.

Under normal operating conditions the L.V. bus-section and transformer circuit

breakers to prevent parallel operation of the transformers. The mode of operation

of the transformers and the generator shall be as described under Section 6 of the

Specification.

1.3.2 Power Transformers

General

The power transformers shall be oil-immersed, natural cooled, double wound,vector group reference Dy.11. The primaries shall be delta connected to give

400/230 volts 3 phase on no load and the center point shall be fully insulated

and brought out to provide a neutral connection which will be solidly earthed.

The primary windings shall have tappings to give

2.5% and

5% voltagevariation operated by an offload tap switch. Switch position No. 1 shall

correspond to the plus 5% tapping.

Transformers and their associated fittings shall be manufactured in accordancewith B.S. 171: 1970. And I.E.C. recomdation 76.

Each transformers shall be complete of carrying its full rated kVA outputcontinuously when working under all conditions, and without the temperature

rise exceeding that stated in B.S. 171: 1970.

The transformers shall be capable of carrying over loads within the limitsrecommended in British Standard Code of Practice C.P.1010: 1959.

Losses

The values of impedance and losses shall be subject to the tolerances specifiedin B.S. 171. The transfromer impedance shall be between 4.75% and 5% at750C.

All transformers shall be fitted with skids. Four jacking lugs at each corner ofthe tank 400mm above ground level shall be provided. All skids shall be

provided with four axle holes suitable for 37mm diameter rods.

Cable Boxes


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Transformers shall be fitted with H.V. and L.V. cable boxes and glands suitablefor the cable types and sizes specified.

Terminals

Terminals shall be marked in accordance with the characters referred to in B.S.171 and shall be stamped or engraved on plates affixed to the tank.

Tank Covers

Tank covers shall be of such contraction as will prevent the accumulation ofmoisture and shall be bolted to a flanage on the tank to to form a weatherproof

joint. All gaskets shall be of synthetic rubber and cork composition.

Oil

Transformers shall be supplied complete with the first filling of oil complyingfully with B.S. 148: 1959.

FittingsFittings shall be provided as follows:

Conservator

Oil gauge

Drain valve (1 in B.S.P. internal thread)with plug

Earthing terminal

Filling hole and plug

Lifting fittings

Thermometer pocket

Rating and connection plates

Plain breathing devices of weatherproof design.

Rating PlateThe rating plate shall show the following:-

Specification reference

Rating in kVA

Volts at no load and normal tapping:-

High voltage

Low voltage

Current at rated load and normal tapping

High voltage

Low voltage

Number of phases

Diagram drawing number

Manufacturers serial numberFrequency

Impedance at normal tapping

Vector group reference

Weight of core and winding assembly

Core material

Weight of oil


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AFCEE I raq In te r im Construc t ion Standards 10 ElectricalServices


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Total weight

Quantity of oil

Year of manufacture

Owners serial number

Manufacturers name and address.

Noise

Every care shall be taken to ensure that the design and manufacture of all

transformers with their accessories shall be such as to reduce noise and vibration

to the level of that obtained in good modern practice.

Harmonics

The transformers shall be designed with particular attention to the suppression

of harmonic voltages so as to eliminate bad wave forms and any possibility of

high frequency disturbance , inductive effects or of circulating currents between

the neutral points reaching such a magnitude as to cause interference with

telephone or communication circuits.

SECTION TWO

LOW VOLTA GE SWITCH BOARDS

2.1 .Description Of InstallationThe contractor shall supply and install the main Voltage switchboard and the

Low Voltage switch gear in the respective areas as shown on the Drawings.

2.1.1 Main . L.V. Switchboard

The switchboards shall be of the cubicle type suitable type suitable for frontaccess and suitable for use on a 380 Volt, 3 Phase, 50 Hertz and rated at 36

M.V.A. minimum.

Each of the main L.V. switchboard sections shall be fitted with an ammeter andvoltmeter with phase selection switches, power factors meters and protection

fuses. All meters shall be 100mm. Dial square flush pattern. Ammeters with

phase selection switches shall be fitted to each outgoing circuit rated at 200 A or

greater.

For outgoing circuits rated at below 200 A ammeters with phase selectorswitches shall be provided at the remote sub-panel.

Current transformers shall be of the ring pattern to Class C (Ratio only) asdefined by the British Standards.

Voltages free auxiliary contacts shall be provided on each of the incoming and bus-suction circuit breaker units to allow indication open or closed on a

mimic diagram of the switch panel in the master control Room as specified, in

section Nine (9).


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The main switchboard cubicle shall consist of sheet metal built up on asubstantial framework of rolled steel or folded sheet steel sections. All edges of

panels shall be radiuses, and when fabricated shall be dead flat and true.

All necessary stiffeners and supports for the framework shall be provided, andalso where required on panels. Sheet metal for the build-up of large panels shall

be at least 2mm. For panels not exceeding 1mx 1m it is to be at least 1.6mm. All

sheet metal is to be specially selected dead flat, zinc coated mild steel. Labels in

general shall be made of Traffolyte or similar plastic material finished matt and

suitably engraved. Exact details of Lettering and Legend, color of label, etc.

shall be approved by the Engineer.

After manufacture all steel work other than that manufactured from zinc-coatedsheet, shall be thoroughly cleaned off and zinc sprayed before any finish is

applied.

Ventilating louvers where required shall be provided on the sides and backs ofpanels and shall be approved design with internal dust baffles.

The cubicle shall be divided internally by sheet metal webs so as to separate lowvoltage equipment as far as possible from instruments, and to obviate heating up

of components. All instruments and equipment shall be securely mounted andall internal wiring runs shall be included and shall be so positioned as to ensure

complete accessibility for servicing purposes from the front of the panel.

All internal wiring shall be P.V.C., insulated, neatly bunched and run onsupporting cleats or insulators, and shall be colored and adequately labeled or

sleeved for identification. All wiring shall be extended to terminate on easily

accessible terminal boards or strips to which external connections can be made.

All terminals shall be labeled for identification. The cubicle shall include a

common earthing bar, equal in size and dimension to life bar.

All paint finishes shall be stove enameled, the appropriate number of undercoatsshall be applied, each being built-up and flatted separately. The final coat shall

be of approved color with gloss finish, and sufficient body shall be given to the

films so that with the building-up and flatting, the final appearance of thefinished unit is entirely free from blemishes or defects whatsoever.

Manufacturers standard finishes may be accepted where these are, in the

opinion of the Engineer comparable with that specified.

The contractor shall submit a detailed drawing of the switchboard for approvalby the Engineer before manufacture.

The contractors attention is specifically directed to the need for each of theseitems to be adequately packed and protected against damage in transit from the

makers works to the site. Similarly, on delivery to site, each cubicle shall be

properly protected from damage until all work is completed.

2.1.2 Bus-Bars

Bus-bars and bus-bar connections shall be constructed in accordance with therequirements of the British Standards 158 and 159.

Bus-bars must be rectangular section hard drawn high conductivity copper,adequately rated and supported by porcelain or molded insulators spaced at

suitable intervals, the complete assembly being capable of withstanding the

maximum mechanical stresses to which it may be subjected under fault

conditions.


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Bus-bars shall be enclosed in separated compartments of cubicle switchboardsand shall be so arranged that all conductors can be brought on to the bars

without undue bending.

Connections shall be made with double split cast brass clamps. Drilling of thebars will not be permitted.

Connections between the bus-bars and the fuse switches or isolators shall behigh conductivity copper bars, having a current rating of not less than that of t

he fuse switches or isolators to which they are connected. The bars shall be

insulated with P.V.C. (Poly Vinyl Chloride) sheathing, color coded for phase

identification.

All bus-bars shall be color coded to British Standards. The precise manner ofidentification to be agreed with the Engineer.

Bus-bars compartments are not to be used as switchboard wiring ways. Only the bars themselves, together with the connection to fuse switches, isolators,

instrument and current transformers shall be permitted within the compartments.

2.2 Air Circuit Breakers The air circuit breakers shall be fully withdrawable and of the current limitingtype complying with the British Standards. The A.C.Bs shall be fitted with over

current and earth fault protection, voltage transformers and interlocking

facilities as detailed on the drawings. Operating mechanisms for the A.C.Bs

should be either solenoid or independent motor would spring type mains

operated to suit the automatic switching and interlocking arrangements required

for the standby generator installation as described in the specification.

The incoming circuit A.C.Bs shall be capable of remote ON/OFF switchingand indication from the Master Control Room over the Building Monitoring

System. As specified in section (9).

The outgoing circuit A.C.Bs shall also be capable of remote ON/OFFswitching and indication from the Master Control Room over the BuildingMonitoring System. On loss of supply to the outgoing circuit A.C.Bs they shall

automatically open and remain open until operated by the Building Monitoring

System.

Remote ammeter indication shall be provided in the Master Control Room fromthe Generator A.C.B. circuit over the Building Monitoring system.

2.3. Fused Switchgear and Isolators All fused switching and isolators whether mounted in cubicle type switchgear of

separately shall conform to the requirements of the British Standard.

The units shall preferably comprise fuse-switches having integral fuses, butmanufacturers may offer the alternative of switch fuses, in which the air break

switch and connections from it to the associated fuse shll be designed to

minimize the possibility of a phase-to-phase short circuit and of the required

category of switching in accordance with the British Standards.

The fuse links for fused switches shall be high repturing capacity, cartridgetype, conforming to B.S.88, category of duty A.C.80 and a fused factor as for

Q.1. fuses.


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When fused switches, isolators, bus-bar chambers and distribution boards areshown together on the drawings, they shall be mounted within a cubicle pattern

front accoss switchboard.

Fuse switches and isolators mounted in cubicle type switchgear shall beenclosed in separate sheet metal compartments and mechanical interlocks shall

be provided between the cubicle door and the switch operating mechanism, so

arranged that the cubicle door may not be opened with the switch in the ON

position.

Similarly it shall not be possible to close the switch with the cubicle door open;except that provision shall be made within the cubicle for authorized persons to

defeat the mechanical interlock and close the switch with the door in the Open

position for test purposes.

The ON and OFF positions of all switches shall either be removable fromor retractable into the unit when the switch is in either the ON or OFF

position.

In T.P.& N. fuse switch units bolted neutral links shall be fitted. For single poleand neutral fuse switches and isolating switches, the neutral conductor shall be

taken through a bolted link. Breaking the neutral conductor, either with linkedor non-linked switches will not be permitted, and the practice of providing a

double pole linked switch with a solid link in one pole for use as a single and

neutral fused switch will not be accepted.

Fuse switches and isolators separately mounted shall be provided with dust-protecting enclosures of either cast iron or sheet metal construction not less than

10 b.g.. Mechanical interlocking between the enclosure door and the switch

mechanism shall be provided.

All switches and isolators shall have the facility to be locked in the OFF andthe ON positions.

All individual units shall be clearly labeled, labels to be Traffolyte or similarmaterial, suitable engraved. Colors, size of engraving et. To be generally as

provided for cubicle type gear.

2.4 Distribution Boards Distribution Boards for lighting and small power shall be of the composite

pattern to provide for outgoing sub-circuits to small power and lighting systems,

these will generally be housed within the distribution panels as indicated on the

schematic drawings. Where isolators are shown controlling fuse boards other

than on panels these shall form an integral unit. All boards shall be of the

lockable type. All time switches where specified shall be mounted on the front

case of the board. (Site Board).

Distribution boards for lighting and small power generally shall be T.P.&N.500volts, complete with miniature circuit breakers of the ratings given on thedrawings. Where T.P. &N. boards are provided to feed single-phase loads they

are to have the bus-bars strapped to form S.P.& N. borads. the neutral bar shall

have one terminal for each separated single phase way.

Distribution boards shall consist of a welded sheet metal case with hinged doorand provided with a gasket in retaining groove. Boards shall be thoroughly rust-


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proofed and finished polished enamel to approved color. The gauge of metal to

be used in the manufacture of these boards shall not be less than 1.6mm.

On each distribution board and on each corresponding switch fuse controllingthe above the Contractor shall provided and fix a suitably engraved label.

Inside the door of each board the Contractor shall provide and fix a circuit listconsisting of legible typed letters on cartridge paper, protected overall by a thin

sheet of Perspex, giving the number and details of points served by each way

and rating of M.C.B. The contractor shall submit a sample of the circuit list and

covering for approval to the Engineer before fitting.

All boards for local surface mounting shall be provided with removable drillingplates top and bottom suitable for conduit entry. Where boards are built into

composite panels adequate provision for trucking and conduit entries shall be

provided for outgoing circuits in air handling units Room sall the boards must

be putted in one enclosures of sheet metal case and the connection between,

helping boxes and their circuit breaker must be through metal duct as per

drawings.

2.5 Miniature and Molded Case Circuit Breakers Circuit breakers shall be molded case all-insulated pattern with silver tungstencontacts and quick make quick break trip-free mechanism.

Molded case circuit breakers shall be mounted in sheet steel boxes of approveddesign and where several breakers are grouped together they shall be housed in

metal enclosures similar in design to cubicle switchboards.

Where miniature circuit breakers provide final circuit protection they shall begrouped in metal enclosed distribution boards.

Three pole type circuit breakers shall be so designed that the operation of theprotective device in any one phase shall cause opening of all three phases. All

three phase loads shall be controlled by three-pole type circuit breakers. Circuit

breakers shall have thermal-magnetic overload short-circuit protection. The

characteristics of the protective devices and associated HBC fuse feeding thecircuit breaker distribution board shall be such that for all currents in excess of he

maximum capability of the circuit breaker, a time of not less than 0.01 seconds

shall exist between the maximum fusing time of the HBC fuses and the minimum

time of operation of the circuit breakers at that particular value of current.

Miniature circuit breakers shall be hydraulic magnetic type and each circuitbreaker shall carry its full rated current continuously, without tripping out, in the

enclosure specified. The calibration of the magnetic-hydraulic trip mechanism

shall not be affected by ambient temperature variations.

2.6 Contractors

Contractors shall be of the air break type fitted with are shields and rolling ,self-cleaning , double break silver faced contacts, contractor coils shall be

suitable for use on D.C. rectifiers at 110 V. rectifiers shall be selenium type and

terminals shall be provided for external control of the contractor on the A.C.

side of the rectifier.

Contactors on the Main L.V. Switch Panel, M.C.C.Board, Gen. Set panel,domestic panel W.P. make-up pumps and fire pumps shall be capable of remote

ON/OFF switching and indication from the Master Control Room over the


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Building Monitoring System. On loss of supply to the contactors they shall

automatically open and remain open until activated by the B.M.S. (By

Monitoring System).

Note:

If the above note is not maintained in drawings but it must be included in allmain and sub panels as in main control specification.

Remote Controls Facilities

All mains board and sub boards, which they feed the zone lighting and power,outside lighting, domestic pumps, and A/C machines they must, have contactors

to open the board and stop them with indicating lamps to be operated and

controlled from main control console in Basement floor the stip bottom will be

connected in series with main points and in parallel with operating push bottom

so that contractors can be energized from points other than the main starting and

stopping points.

Domestic pumps control board must have facilities for an automatic manualcontrol switch such switches have three positions off-automatic and manual

when the switch is in manual position the contactor will operate with push

buttons, when it is in the automatic position the contactor is operated by a relay

or flood switch. (Limit Switch).

The electrical contactor is responsible to check the sequence and correctconnection of all the contactors so as to fulfill the requirements of domestic and

air conditioning equipments and their sequence of operation.

SECTION THREE

CABLES AND WIRES

3.1 Cables Installation and Tray

[Cables and sub main Distribution Cable and System of Wiring]

3.1.1. Description of Installation

The contractor shall supply , install and connect the mains distribution cables asdetailed in drawings.

The contractor shall supply and install single, three or four core cables P.V.C.insulated P.V.C. over sheathed 1000 volt insulation inside trench in substationbetween transformers, main switchboard, A/C switch boards, in basement. The

contractor shall supply cable tray horizontal and vertical inside shaft, over fales

ceiling. For all cables from main switch board to sub-boards in floor, lifts in roof

and from A/C board to air handling units in floor, pumps , chillers in basement

cooling towers. From domestic boards, to pumps, in basement. According to the

drawings, cables shall be terminated in main boards and sub-boards.


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3.1.2. Site Cables

All cables used for site work must be as above but P.V.C. insulated P.V.C. oversheathed single wire galvanized armoured for mechanical protection.

3.1.3. Cables Generally

No joints will be permitted in cables run between any two points unless the lengthsinvolved are longer than standard manufactured lengths, the Engineer shall beadvised and approve any necessary joint position.

In all cases where a cable terminates at a distribution board, electrical outlet etc., asufficient amount of slack cable shall be allowed for future trimming, stripping

back and reconnection to the terminals without causing stressing to the cable in any

way.

Where single core cables enter any item of metal-clad switchgear the cables shallall pass through the same aperture in the enclosure or case of the unit concerned.

Where separate holes are provided by the manufacturer for cable entries, a

continuous slot shall be provided between the holes or the holes shall be drilled in

a plate of non-magnetic material.

Where cable lugs, terminal or sweating sockets are employed, they shall be of thecorrect bore to suit the cable which they are intended to connect. The cables shall

be of good fit in the sockets which shall be of adequate bore to contain all strands;

the filling in of surplus space with solder will not be permitted. All cables sockets,

clamps, etc., shall be made in strict accordance with the British Standard.

All cable shall have high conductivity copper conductors and shall comply with theappropriate British Standard Specification. All cables shall be delivered to site with

the Makers Identification Lables attached and these shall be handed to the

Engineer on request.

3.1.4.Color coding of Conduits, Trunking etc.

Conduits, trunking and sheaths of cables shall be identified by a Color code asdetailed below. The Color markers may be neat painted bands or be self-Colored

plastic with a minimum width of 25mm at intervals not exceeding 10 meters. For

vertical risers this shall be increased to at least one band per floor level.

Where multi-compartment trunking is used each service shall be identified by aColor code.

The contractor shall be responsible for the off-loading and handling of the cableon site, and shall ensure that cables are delivered to site on drums and properly

protected against mechanical damage. Where lengths are out from cables the

open cable ends shall be sealed.

Each drum when delivered shall be accompanied by a certificate givingmanufacturers name, works order number and results of tests carried out in

accordance with the appropriate certification.

3.1.5. Support and Fixing for Cable

Cables generally shall be run in service ducts and/or false ceilings as indicated onthe drawings.

Where cables are run fixed to the structure or in vertical ducts provide and fixclaw type cable cleats. Cleats shall consist of two similar halves , pressure die

cast aluminum alloy, with single or double bolt fixing according to cable size.


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Cable supports shall be spaced and arranged to give adequate support and fixingfor the various cable sizes. In general the contractor shall work to the cable

manufacturers recommendations, particularly as regards vertical runs.

Large multiple cable runs shall be supports by perforated cable tray. The contractor shall include for all word associated with fixing cable supports to

the structure such as cast in fixings etc.

When cables run under ground they will be inside P.V.C. pipes of suitablenumbers and types. Manholes will be constructed at both ends of pipes. With

steelfisher wire inside each pipe for future installations as per attached drawings

and sketches.

Space between cables where more than one multicore cable is laid in the nametrench space of (25-40) cm is desirable in order to reduce the effected mutual

beating and to ensure that the fault occurring one cable dose not effect damage

the adjacent cables this distance can be reduced by using insulated materials or

bricks.

Cables laid in their formation, there should be vertical spacing of (25-40) cmbetween the adjacent layers and their intervening space should be packed with

fine sand.

3.1.6 Road Corssing

cables should be laid under the roads through cast iron pipes galvanized steel orreinforced concrete pipes steel pipes are preferred because of their high resistance

to mechanical damage and easier installation. The pipe should be laid at an angle

to avoid sharp cable bends at the points of entry and exit.

3.1.7 Spare Pipe

Spare pipe should be simultaneously installed for future augmentation. In case ofsingle conductor cables the tow cables of a single phase circuit or three cables of

three phase circuit can be placed in one pipe of steel. Steel pipe should not be

used for carrying one single conductor.

3.1.8 Crossing Water Mains

A minimum clearance of 40 cm should be provided between water pipes orconduits and the power mains. On other case compound shall be used.

3.1.9 Clearance for Low Current Cables

The desirable horizontal and vertical separation between the power andcommunication 60cm but in no case it should be less than 40 cm for single core

cables and 30 cm for multicore cables where the clearance is loss the cables

should be laidsolid in compound and they must cross at right angle as for as

possible.

3.1.10 Identification of Cables

Cables shall be provided with identification labels at all positions where cableschange direction and where cables are in multiple runs, labels shall be at 10

meter intervals.


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Labels shall be manufactured from brass plated engraved to show the size of thecable and the equipment being fed. In cases where the cable is feeding a single

phase load the phase shall also be shown on the lave.

3.1.11 Cables Laid Direct in the Ground

Cables laid direct on the grounds shall be installed in trenches to a depth of notless than 600 mm on a 60mm deep bed of riddled earth or builders sand as per

drawings.

Trenches shall be back filled and consolidated, a layer of riddled earth or sand notless than 75mm deep being laid immediately over the cable.

The cable be protected by earthenware or concrete cable covers of approvedmanufacture and to be clearly marked with the words Danger-Electricity. These

covers are to be laid over the entire length of the cable and immediately above the

riddled earth or sand coverings.

Where cables feeding separate services of differing voltages are accommodatedin the same trench the cables shall be laid not less than 300mm apart and shall

each be covered by covers of different pattern so that the services may be easily

identified. The route of the cable or cables shall be clearly marked by cable markers of

approved pattern, particular attention shall be paid to changes of direction of the

cable path. Exact number of markers to be agreed with the engineer.

Where cables cross beneath roadways they shall be installed in earthenwareducts.

3.2 PVC Cable All P.V.C. insulated copper sheathed cables and cable accessories, glands etc.,

shall be 1000 volt grade, PVC sheathed.

All terminations and seals shall be made in accordance with approved methods,care being taken to exclude moisture and foreign matter from the terminations

and seals. The seals shall be tested immediately on completion and repeated whenthe whole installation has been completed.

All terminations shall be provided with a tight fitting PVC covering sleeve. Cable terminations at distributions boards and switchgear shall be made by means

of cold screw-on pot type seals, and in conjunction with ring type universal

glands. Brass locknuts with serrated washers shall be used where cables terminate

at equipment not provided with a screwed entry.

Cable seals sealing compound and sleeves for general use shall be suitable foroperating temperatures up to 105

0C. For terminations at lamp holders and heaters

whose terminal chambers will exceed 1050C, seals , sealing compound and

sleeves shall be 1850C grade.

Seals shall be secured at plant and accessories by standard compression glandsretained in screwed or clearance entry holes. These holes shall be suitable sized toavoid the need for increasing or reducing sockets and nipples. Nuts, sockets and

nipples shall be of brass. Gland plates for single core cables shall be

nonmagnetic.

Manipulating and straightening of cable shall be carried out with bending leversand roller straightners manufactured by the cable maker. The use of a wood block

and hammer will only be permitted for final dressings.


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No through joints in any P.V.C cables shall be used unless approved by theEngineer. Where so approved by the Engineer. Where so approved the joints shall

be of the brass sleeve type internally threaded at each end to receive a ring type

universal gland, fitted to each of the cable ends. An ebonite spreader shall be used

within the sleeve to hold the cores in position. Solder type connectors shall be

used on all cables up to and including 25mm2. Above this size mechanical type

connectors shall be used.

Where P.V.C. cables are run to motors, etc., on island bases, they shall be drawninto protective conduits buried in the floor, or run overhead on cable tray

dependent on supply position.

All P.V.C. shall be kept entirely separate from pipework associated with otherservices and in general direct contact will not be permitted between the cables

and such pipes.

The contractor shall satiety the Engineer that all labour employed in theinstallation of cables is properly trained in the methods recommended by the

cable manufacturers and approved by the Engineer and that all personnel are fully

competent to carry out the work.

3.2.1 Identification of Cables

All cable terminations shall be provided with )-type PVC cable markersconforming to BS 3858 to give phase identification.

Sleeves shall be coloued to suit the various services and printed with anidentifying letter or numerical symbols.

Single Core Wires.PVC.33 PVC wires shall be generally in accordance with BS 6004. The wires shall be 450/750 volt grade consisting of high conductivity copper

wires insulated with PVC compound.

The contractor shall comply with the Manufacturers recommendations inrespect of maximum ambient temperatures for any specific type of cable.

The contractors attention is drawn to the necessity of ensuring that the conduitsare of sufficient capacity to allow all cables to be easily drawn in and out.

The insulation shall be self-Colored to indicate phase or the circuits, polarity forD.C. circuits and generally to differentiate between separate electrical services.

Minimum conductor sizes shall be as follows:-- Lighting 1.5mm2 unless indicated.

- 13A Socket Circuits 2.5mm2

unless indicated.

- 15A Socket 4.0mm2

unless indicated.

- Fan coil unites sockets. 4.0mm2

unless indicated.

During installation, cables shall be combined to facilitate drawing in and possiblereplacement.

Inside cable trunking, the cables forming final sub-circuits shall be tied or clippedtogether to ease identification. The spacing of binders shall not exceed 1.5 meters.


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3.4. Heat Resistant Cable heat resisting cables (850 C ) are specified for boiler houses or similar plant

rooms they shall be EPR insulated, braided and compounded in accordance with

BS 6007.

3.5. Flexible Cords Flexible cords shall be in accordance with BS. 6500. The rated voltage being

300/300v, 300/500v and 450/750v dependent on cord type.

PVC insulated flexible cords shall be in accordance with Section three of BS6500 the conductors being annealed copper complying with BS6360.

The minimum conductor sizes shall be as follows:- Lighting fitting final connections 30/0. 2mm

- Call systems 32/0.25mm

- Shaver socket outlet final connections 30/0.25mm

Where not detailed above the cable size shall be of the same current rating as therest of the circuit.

3.6. Cable Protection Sleeves comprising plastic conduit shall be installed for all cables passing

through brick, concrete or similar structures to permit future withdrawal without

disturbing the structure. The plastic conduit shall be sealed after the cables have

been installed.

All exposed or concealed cables rising from the ground or floor shall be protectedup to a height of not less than 2 meters. The protection shall be by means of steel

tube or metal channel of minimum thickness 2mm. Bare metal sheaths of cables

so protected must be covered to prevent corrosion.

3.7. Cable Core Identification Indelibly printed cable markers shall be fitted over all lands of outgoing cables n

sub-main and final distribution boards to mark clearly the corresponding circuit

numbers and (D.P. and T.P. Boards) phase Colors both on live and neutrals.

Cable cores for extra low voltage or similar applications shall be distinctivelyColored and/or marked. The Colors used shall be different from any of those

specified for other purposes.

In addition to phase identification, the cores or cables connecting control gear,thermostats, valves, etc., with marked terminals shall be fitted with

identification sleeves bearing the same markings as the terminals of the

apparatus to which they are connected.

3.8 Telephone and Sound System Cables Plastic insulated indoor cables meet the telephone network requirements, the

maximum voltage 75 volt the minimum bending radius must not be less than

five times the outer diameter of the cable with the following specifications: -


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Conductor : Tinned annealed copper

Insulation : Plastic

Groups :Three or four insulated conductors standard together.

Earth Wires : One or two of tined annealed copper insulated.

Laying up : Groups in concentric layers of segments.

Sheath : Plastic

Size :As in Drawing (1x3x0.6-20x3x0.6) mm.

Electric protection : Screened , (copper wire braided )

Quad No. in Layer : Nos. (2,4,6) and Color, blue , white , organic

etc.

Conductor Colors for sound : One Color per wire.

3.9 Fire Alarm ad Signaling Cable Same as telephone cables with the following specifications:

Conductor : Tinned annealed copper

Insulation : Plastic

Earthling : Aluminum tape or copper around each insulated

conductor

Laying up : Insulated conductors in concentric layers

Jacket : Plastic

Color : White

Nos. and diameter of conductors: (4x0.8 + 0.8) mm2

per each detectors.

3.10 Cables for Camera Connection All cables used in closed circuit television systems shall be selected to match the

particular installation.

Cables shall generally meet the requirement of B.S.S. 5425 and shall beapproximately rated for impedance, capacitance and attenduation. Cables shall

generally meet the requirements of B.S.S. 5425 and shall be approximately rated

for impedance, capacitance and attenuation. Cables shall generally be 75ohm

coaxial low loss type and construction shall consist of a circuit should plain

annealed copper conductors insulated with extruded polythene screened with a

longitudinally applied copper. Tape suitably over lapped and held by a copper

wire braid with a black polythene cutter sheath, where cables are to be

burieddirect in the ground they sahll incorporate immediately below the outer

sheath a ploythene covered longitudinally applied aluminum moisture barrier

tape.

Interference to sensitive cables circuits shall be reduced by the use ofmechanically and electrically continuos metallic ducts of conduits, screened

cables or physical separation metallic screens. Shall be effectively earthed, cables

for video circuits shall not be drawn into the same conduits or trunking

compartment as a cables for audio and talk back circuits. Two compartment

trunking may be used instead of two separate trunking runs.

Flexible cables connecting power supplies to camera equipments shall havecopper conductors P.V.C. insulated and sheathed flexible cables shall generally


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be in accordance with B.S. 6500 and no flexible conductors small than 0.75 mm

shall be used.

All cables shall be provided with appropriate coaxial connectors, adapter andjunction boxes for the correct termination of the cables. Multicore cables shall be

provided where remote control of camera focus 200m, pan and tilt are required

and for switching the camera remotely to stand by conditions. Associated push

button controls shall be provided accordingly.

3.10.1 Type of Cables

Power cables for power supply of cameras P.V.C. insulated P.V.C. over

sheathed not less than 1.5mm2.

3.11. T.V Cables Coaxial Type- Annealed copper inner conductor.- Polythene plastic insulation.- Tinned copper wire braided outer conductor-

Plastic jacketIt will be used with radio, T.V. and measuring equipments characteristic

impedance 75ohms.

3.12 Heavy duty cable tray Standard Heavy duty cable tray produced from hot-dipped galvanised sheet steel,

the tray width must be as in drawing between (30-60) cm of 2mm gauge of 300cm

standard length 7cm.

Flange (side returns) slotted complete with all accessories such as for wayintersection bends, reducer, couplers , Fish plate, cranked couplers, Thread Studs,

Hexagon screw and nuts off stand brackets, cantilever bracket and arm, washers for

horizontal and vertical running.

3.13 High tension cableP.V.C. inserted and sheathed power cable steel galvanize wire armored for

rated voltage of 10 kV.

- Nominal voltage 10 kV.- Test valtage 17 kV.- Type p 41.

Conductors : wire of soft annealed stranded copper.

Core : conductor insulated with seamless high quality P.V.C.layer.

Cable core: crossed laid up intertics filled with unvulcanized rubber.

Mechanical and electrical protection single wire armored with stranded copper wire

under armor will be lay directly into ground.

3.13.1 Suspend Tray

Dotted sheet steel hot dip galvanized tray for heavy duty suitable to carry the

total load of running cables with supports for each 0.5 meters length and tray

joint at mid span. The gauge of dotted plates must be not less than 2mm and the


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length of the plate 2.5 meters. For quick and easy installation complete with

special flanges, bends and tees for complete installation as per drawings. The

size of tray and their height must be according to the drawing.

3.13.2 Vertical Shaft

In vertical shaft all cables must be fixed on spacer by saddles in a distance not

more than 50cm. The spacer bar must be fixed on steel brackets and must be

designed with central slot for variation in the fixing line of the cables. The

vertical clearance between cables must not be less than 1.5 cm. And the

horizontal distance between the cables must less than 5cm. The general design ,

connection and arrangement of the cables should facilitate the withdrawable and

replacement of individual circuits cables without the necessity of interrupting

supplies. When different cables run horizontal or vertical on cable tray barriers

must be inserted in the tray for laying power, communication, fire alarm and

T.V. cables separately according to regulation and standards. The system will be

installed in four electrical shafts. All cable support systems. Ladder, cable tray

and vertical ducting must be from one famous such as, Van trunk, Swifts , Davis

or Similar approved.

SECTI ON FOUR

INSTA LLA TION, SOCKETS AND SWITCHES

4.1 Description of Installations The contractor shall provide , install and connect all the necessary equipment to

from the complete internal lighting installations comprising P.V.C. cables in

conduits, luminaries , lamps, accessories and fixings as shown on the drawings.

Lighting in building has been designed in conjunction with the architect as partof an integrated design and the lighting installations shall be carefully co-

ordinated throughout all stages of the contract, incandescent wall and table top

luminaries , down-lighters, indirect fixture and general decorative lighting.

In all staff areas and other areas on the site the lighting comprises fluorescentand incandescent luminaries as shown on the drawings.

Control of lighting shall generally by from local wall switches and dimmercontrollers as shown on the drawings. Table lamps and standard lamps shallgenerally be served from 5 amp round pin unswitched socket outlet, the socket

outlets being controlled from local wall switches also.

4.2 Luminaries The contractor shall provide , install and connect all luminaries in accordance

with the types shown in drawings.


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Conduit suspensions shall be provided for all pendant fittings. The stems shall bescrewed to ball and socket type dome lids with positive earth connection.

Circuit cables shall not be routed through bulkhead or other fittings where thecables would be liable to undue temperature rise and shall terminate in a fixed

base connector in a conduit box mounted behind or adjacent to the fitting. Final

connection to each fitting shall be carried out with silicone rubber insulated

cable.

Conduit terminations to all aluminum fittings shall be fitted with brass bushes toprevent corrosive action between the steel and aluminum components.

4.3 Description Lamp-holders with the exception of hand lamps and fluorescent bipin units shall

be of the non-ferrous metal type. Lamp holders types E.S. and C.E.S. shall be so

connected that the screw portion is in the neutral conductor.

All fluorescent fittings shall be complete with quick starting control gear, powerfactor capacitors and lamps. The metal work of all fittings and starting equipment

shall be effectively earthed to the installation. Fittings without a shunt connected

P.F. capacitor shall incorporated a voltage dependent resistor o counteract surge

voltages.

All lighting fittings shall be cleaned using an anit-static cleaning fluid prior tofinal erection.

Each lighting fitting shall be complete with a lamp for each lamp way specified. The contractor shall not place an order any luminaries without prior approval of

the Engineer. The final positions of all luminaries shall be verified by the

contractor before the outlets are installed.

Unless otherwise detailed, recessed and semi-recessed luminaries shall beconnected by means of an adaptable box with fixed base connector. The final

connection to the luminaries shall be via a B.S. fixings 3 pin ceiling rose and

300/500 volt grade 24/0.20 mm. Silicon Rubber insulated Terylene braided

flexible cables.Lamps

The contractor shall include for the supply and installation of lamps for allluminaries as detailed on the contract drawings and in the schedule of

Luminaries.

Tungsten lamps of the general lighting service type shall be coiled coil, pearlfinish with B.C. cap for lamps to 100W, single coil with B.C. cap for 150W and

single coil with E.S. for 200W and above except where detailed otherwise.

Tungsten lamps for spotlight applications shall be single coil 100% internallysilvered with E.S. cap; single coil 150W per 38 with internally silvered reflector

and E.S. cap or single coil 200 per 56 with internally silvered reflector and 2 lug

caps.

All flourescent lamps shall be of quick-start quality with Bi-pin lamp caps.Flouresent lamps shall be white unless otherwise stated. All other lamps shall be

as required by the luminaries specified in drawings. The installation of lamps

shall be carried out immediately prior to the handing over of the building and not

when the fittings are erected. Before any lamp is mounted in its respective

luminaries the luninarie and its diffuser shall be thoroughly cleaned.


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When there are two proposal for one lighting fixture the owner have right toselect anyone of them and the second chose will be neglected, this will be before

ordering the fixture.

Lighting Switches

Lighting switches shall be A.C. only type capable of operating at their full ratedcapacity. Minimum rating of lighting switches shall be 10A, or 15A.

Switches shall be one way, two way as required and where mounted together,they shall be fitted in a common box. For surface installations they shall be fitted

with fixed grids and in flush installations the gride shall be adjustable with

matching front plates and having a 6mm minimum overlap. All switches must be

similar to M.K. crosvenor range or similar approved.

Switches mounted externally shall be galvanized water resistant pattern fittedwith machined box and cover joint, neoprene seals and external fixing lugs.

Switchboxes shall be suitableyburried and labeled where two phases are

connected in the same box. It is not berfered each phase must be in separate box

as in drawing. Every switch controlling an appliance not visible from the

switching position shall be engraved with the name of the appliance it controls. All switches, sockets, telephone sockets, T.V. sockets dimmers switcher must be

from solid brass polished and finally given a special extra dutiable heat-cured

powder lacquer finish.

4 .6 Dimmer Switches Dimmer switches shall be provided suitable for the control of the lighting circuits

and loads as detailed on the drawings.

Dimmer switches shall be grosvenor type 500W max. 75W min fuse protectpush on- push off switching rotary dimming gridswitch type and shall be rated

at double the circuit load to be operated. They shall be flush mounted and

faceplates shall be finished to match the other switches and socket outlets

specified for the area. They will be used for one way to two ways circuit. RadioFrequency interference suppressed to B.S. 800, 1977 will be used for dimming

tungsten lamps only complete with necessary flush deep boxes.

4. 7 Engraving of Switches All multi-gang switch plates shall be engraved to indicate the lighting controlled

by each switch. The engraving details shall be agreed with the Engineer on site.

4. 8 Emergency Lighting The contractor shall supply, install and connect 110 volt D.C. emergency lighting

luminaries as detailed on the drawings and in the schedule of luminaries. The

luminaries shall be connected to the live side of the adjacent lighting circuits

and the lamps shall operate automatically under mains failure and shall remainilluminated unless the mains or the stand by generator emergency supply is

restored prior to this.

4. 9 Electric Shaver Outlets Shave outlets shall be from local lighting circuits using the approximate circuit

cable size. Outlets shall be universal type with a dual voltage (230 or 110V)

output. Each outlet shall incorporate a double wound isolating transformer to


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provide an earth free supply sand the primary circuit shall include a self-resetting

thermal overload trip. Outlets shall be suitable for use in bathrooms (in D.G.

Room only).

4. 10 General Power Installations

4. 10. 1 Description of Installations

The contractor shall supply, install and connect all necessary equipment and finalcircuits to from complete sgeneral power installations as shown on the drawings.

13 amp switched socket outlets shall be provided throughout the respectivebuilding and shall generally be connected on one circuit three sockets from the

distribution boards. Final distribution to fixed electrical equipment shall terminate

in isolators adjacent to the equipment. Final connections to heat producing

equipment shall be carried out using flexible conduit with asbestos braided

cables. Each 15A. power sockets will be connected with one circuit to

distribution sub-boards. Fan coil units three sockets in one circuit sockets for

electrical hot water one socket per circuit.

4. 10. 2 General

The contractor shall supply, install and connect all necessary equipment to form acomplete general purpose power installation.

The various installations shall be carried out in accordance with the drawingsusing cable sizes indicated on the circuits detailed on the drawings. But in any

case not less than 3x1x2.5mm2

for 13A. sockets, 3x1x4mm2for 15A. sockets and

3x1x1.5mm2

for lighting circuits.

4.11 Socket Outlets All socket outlets shall be switched 13 amp 3 pin and shall comply with B.S.

1363. The face plates shall be in accordance with drawings and shall be of the

same manufacture to match the lighting switches being provided. Al socketoutlets shall be provided complete with plug tops.

Generally the 13 amp socket outlets shall be connected on circuits comprising2.5mm2 PVC in conduit and/or trucking in the form of a ring brough into a

M.C.B.way at not more than 20A. generally , upto (4) 13 outlets will be permitted

per circuit.

4. 12 Fused Spur Units Switched fused spur units shall be provided as indicated on the drawings for the

control of single phase fixed items of equipment. All spur units shall be of the

same manufacture and finish as the socket outlets.

An engraved label shall be fitted to each spur unit to define the apparatuscontrolled.

4.13 Connections to Fixed Equipment All connections from fused spur units to fixed items of equipment shall be

provided by means of a flexible cable.

Generally, this connection shall be made using a 20mm conduit from the spurunit to a flush conduit box provided with a square overlapping cover plate with


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a suitable grommed opening and installed in a suitable position behind or

adjacent to the item of equipment to be connected.

4. 14 Time Switches Time switches shall be self-contained units 24 hours or solar dial type as

specified suitable for operation on the local low voltage A.C. supply,. Solar dial

type shall be complete with an automatic solar dial, to permit accurate selectionof switching times, self-starting synchronous motor with a single pole fuse in

the motor circuit, a 3-way terminal block and a 36 hours spring reseve.

The dial shall be capable of switching ON at sunset and OFF at sunrisethroughout the year by control of a secondary calendar dial with month and day

settings, and automatic w time shall be adjustable upto on hour. Day omission

facilities shall be included as specified.

Kitchen Equipment

Kitchen equipment will be supplied and installed under a separate section, thecontract. Under this section, all necessary electrical supply shall be provided

from local switches or 15 Amperes outlets. Final connections shall be to suit the

particular equipment. Where equipment is remote from final walls or where it

may be necessary to move equipment to aid cleaning , connections shall be

drawn heating elements shall be made using heat resisting cable.

A separate earth bonding network shall be provided in kitchen. The bond shallbe connected to the system earth.

Flush cooker control units B.S. 4177, 1967 must be used as per equipmentrequirement all switcher must be double pole flush mounting with on-off fitted

with pilot lamp. Sockets must be fitted with pilot lamp and earth terminals

number of switcher and socket and their sizes must be as per drawings.

Important Note:

1. All the conduits must run under false ceiling and fixed directly by specialsaddles on existing concrete slab, beams and columns undepended on false

ceiling as indicated on drawings. Switches, sockets will be recessed inwalls and floors, trunking systems for supply the power to electronic

equipments.

2. Heavy gage P.V.C. conduits will be used 20mm or 25mm diameters withall accessories such as coupling, joints, nipples, lead washers, Adapters,

elbows, tees, bends, circular boxes, boxes ceiling rose, square and

rectangular boxes, covers, gasket rubber, saddles, bushes, reducers ,

glands.etc.

4. 16 Electrical Installation (for air conditioning ) Electrical wiring for connecting all motorized valves, three way valves, two way

valves, summer winter switches, thermostat and humidistates as per A/C drawings

and plans. 1/044 P.V.C wires inside dia. Heavy gauge conduits galvanized type must be

used.

The supply of this units must be from distribution switches which supply the airhandling units.

Necessary fuses or air circuit breakers for protection of these circuit. The connection of A/Cable switch board with sub station must be according to the

size of cables indicated in drawings.


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The connection of A/C machines and air handling units must be according to A/Cdrawings.

Notes

The responsibility of Electrical contractor is to supply and install electricalpoints for the above epuipments.

The main A/C switch board and control board, subboards , cables are includedin A/C bill of quantities and drawings.

The cable tranches for A/C Cables entry are included in A/C Bill of Quantitiesand drawings.

SECTION FIV E

FIXTURES

5.1 Lighting Fixtures:The wall mounted lighting outlets shall be provided at 210cm above the finished

floor level unless stated otherwise. The contractor shall supply, install connect

and test the various types of lighting fittings as specified in the drawings andbill of quantities. These shall be suitable for 220v 50Hz A.C. operation at an

ambient temperature range of 0.0C to 50

0C. They shall be complete with

housings, reflectors, louvers, ballasts , capacitors, holders, lamps, tubes, etc as

per requirements.

5. 2. Schedule of Luminaries

Type A-

(2x 40) watt fluorescent fixture metal reflector open end,

white stored enamel complete with electrical unit lamp

holders, tubes, starters,chockes, capacitors to improve the p.f, bracket to

secure conduit in to the end of the luminaries, will

be used in basement floor plant Room, sub station

in domestic boiler Room, air handling Rooms in Floors and lifts Room on Roof

will be installed in surface way by two screw and plastic fixing plugs. In

ceiling slab.

Type B-

(1x40) watt fluorescent fixture metal reflector open end

white stored enamel complete with electrical unit (batten)

Lamp holder, tube, starter,

chock, capacitors to improve the power factors, bracked

to secure conduit in to the end of the luninarie will be

used in small stores in floors will be installed in surface way by

in junction by two screw with ceiling.

Type C-


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(2x40) watt recessed fluorescent luminaries 30x120 cm

size metal transverse louvre to mach

and suit the false ceiling system complete with tubes, lamp holders, chockes

capacitor to improve p.f. electrical unit in side shallow white metal body

assemble these type will be used in all offices, corridors or chive, hall, lobby,

meeting , pharmacy , library lecture halls class rooms. Possibility for two

methods of suspension, conduit rod suspension or side arm suspension for

direct attachment to the structural false ceiling so the false ceiling by using this

method allows the ceiling to be fully installed before the lighting . this method

must be an integral part of fixture.

Type D-

Eye ball spotlight semi recessed fully adjustable luminaries white stove

enameled body and anodized aluminium trim con cealing fixing ring G.I.S

lamp holder 100 watt auxiliary reflector will be used in

corridors lecture hall glass ground and first floors in halls can

some drill as. For decoration the size of Fitting 190 mm

diameter 180mm width will be fixed in false ceiling by fixingring with side arm suspension for direct attachment to the structure of false

ceiling.

Type E-

Fully recessed luminaries , white ceiling ring 180mm diameter 290 mm width

150watt complete with control gear mounted remotely in control gear box will

be used in corridors of floors and lecture halls with type (c)

fluorescent with side arm suspension for direct attachment to the

structural of false ceiling.

Type F-Down light domestic cylinder surface mounted 60 watt E27.

Lamp holder brushed silver finish with integral baffles 111mm

diameter 197mm length will be installed by two screw in junction

box will be used in entrance of hospital basement floor and around floor.

Type G-

Screw neck heat resist and porcelain galleries white opal

glassware 100 watt 203 mm diameter 241 depth complete

with lamps and accessories will be fixed by two screw on

junction box will be used in toilet of basement floor and stair

case from basement to ground floor.

Type H-

High design luminaries for wall mounting with glassware

cylinder smoked glass with chrome trim finishes. 254mm

diameter and 260mm length


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will be projection from wall 194mm complete with lamps 100 watt GL.S.

lamps will be fixed on wall by two screw with junction box. Will be used in

staircase between Ground and Lest floor and in toilet above mirror in Dr.

nuteses and rip department toilets.

Type I-

Same as type (H) above but for ceiling mounting will be used in

entrance space of toilet in ground, first, sec, third and end floor.

Type J-

2x40 watt wealthier line with acrylic diffuser will be

used in Kitchen and laundry complete with tubes,

chocks, starters, holders capacitor

To improve power factors, these will be fixed in

surface way on false ceiling or concrete slab by

screw in junction box.

Type K-

High design luminaries for ceiling mounting single pendant

large sphere smoked glass ware 258mm diameter 900 mm

suspended corm rise and fall unit with ceiling Rose E27

Lamp holder 100 watt G.L.S. Lamp will be used. In cafeteria.

Type K--

Same as type K. but cylinders shape, Smoke glassware 258

mm length, 132 mm diameter with suspention set corm rise

and fall unit with ceiling

rose will be used in buffed and sect praposal for cafeteria.

Type L-

Lighting fitting for 3x36 fluorescent light high

light efficiencies with modern optical, system

comprising aluminum mirror,

reflectors to give an out standing light

distribution and high light out put ratio. For recessed mounting will be used in

operation theatres in first floor and in delivery and cortege rooms.

Type M-

Mini flood light 150 watt wall mounting out door for achievingdecorative effects around the building main body back polyester,

mounting base injection moulded

glass filled wire base black nylon lamp holder porcelain complete

with main terminal , wring entry , mounting holes suitable for

screws in junction box will be located and installed around the

building 2100mm from F.F.L.


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Table Lamps:

Solid metal parts support a hand blown glass lighting fitting high quality

material and surface finish classic shapes for desk mounting, E27 lamp holder

100 watt with pull switch and 2000 mm wiring length 480mm length 350mm

diameter , will be used in Dr. Rooms.

Floor Stand Lamps

Heavy table and floor lamps for an interior requiring simple solid metal part

with a care fully finished surface support light sources. Surrounded by white

glass to provide soft white and comfortable light. 3 in condescend lamp E27,

3x75 watt, three ply opal glass and brass metal part wiring set 2500 mm length

with foot switch 500 mm diameter of glass 1600 mm length, will be used in Dr.

Rest Rooms.

Type C-

Same as type (c) but 1x36 watt will be used in ward

rooms.

Type N-

6 watt fluorescent lamp recessed type 220v, 50Hz

will be used in ward room for night light will be

installed +45cm from F.F.L under switches gangs

(25-30)cm

from door the fitting will be controlled by switch in electrical room under

(D-B) of that region. The fixture will be inside rectangular box. The diffuser

will be from hard polyester casing grey - white covered with die. Cast metal

louver (243Mx98x79mm) (LxWxD).

Type O-Operating theatre surgical fixture light adjustable by

remote handle field of illumination adjustable from

180mm to 400mm diameter. Consisting of 6 nos. 250

watt Quartz halogen

lamps and color correcting cylinder to give a color temperature of 6000k

complete with wall mounted solid state push button control for a choice of five

illumination leve

Electrical_Specifications Technical Requirements 74 Pp

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