Technical Specification of Ie

8/11/2019 Technical Specification of Ie

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CLAUSE NO. TECHNICAL SPECIFICATION FOR INTERNAL ELECTRIFICATION

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Intent of Specification

This specification is intended to cover Internal Electrification for the building. It is notthe intent to specify completely herein all aspects of design and constructionalfeatures of equipment and details of the work to be carried out, nevertheless, theequipment and work shall conform in all respects to high, standards of Engineering,

design and workmanship and shall be capable of performing in continuouscommercial operation in a manner acceptable to the owner who will interpret themeaning of the specifications and drawings and shall have right to reject or acceptany equipment or work which in this assignment is not complete to meet therequirements of this specification and/or applicable Codes and standards mentionedelsewhere in the specifications.

Scope of Work

The scope of work under this specification shall include Design, Fabrication, Supply,Storage, Erection, Testing and Commissioning of following items for completeinternal electrification of building:

(a) LT Distribution Boards(b) Lighting Panels(c) Lighting/Power Distribution System for the building complete with wires,

conduits, switch/socket outlet boxes,switches,sockets, Lighting fixtures, fans,Receptacles and accessories etc.

(d) LT Power Cables/wires from Main distribution board to Lighting panels(e) Earthing & Lightning Protection System(f) Any other work required for complete electrification

The scope of work shall also include all civil works associated with erection ofDistribution boards, Lighting panels and conduit either concealed in walls or ceiling,switch boxes, receptacles, earthing & lightning protection system etc. Minor Civil

Works like fixing of anchor bolts clamps, cleats and breaking of walls / floor forinstalling conduits /cables/earthing conductors etc. and sealing of walls / floorsafterwards shall also be included in the bidders scope.

Materials and components not specifically stated in these specification but arenecessary for operation of the systems, mentioned therein shall be deemed to havebeen included in the scope of work of these specifications. Whether called forspecifically or not, all accessories, hardware and services required for normalsatisfactory testing, commissioning, operation of equipment/system shall be deemedto be included in the contractors scope and cost of these shall be included in unitrates quoted by the Contractor.

The Electrical Contractor shall also obtain at his cost all the sanctions from relevant

authorities such as installation checked and approved by the Electrical Inspector orfrom any other authority if required, on behalf of the owner.

The tender drawings show the lighting layout and electrical distribution ofvarious areas of the building in general. However, the detailed electrical layouts,circuit diagrams, conduit layouts etc. for construction shall be prepared by thecontractor and submitted for owners site Engineer approval during detailedengineering. It shall

KUDGI STPPSTAGE-I (3 X 800 MW)

Bid Doc. No. :

CS-9573-000-1

TECHNICALSPECIFICATIONS

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be the responsibility of the contractor to estimate the quantities of conduits, wiresand other equipment/materials etc. correctly as per approved layouts/drawings.

The contractor shall furnish all relevant drawing, data, catalogues, instructionsmanuals of the equipment supplied by him as per the requirements of the contract.

The contractor shall submit to owner one marked up copy and one original copy ofall as built drawings after installation of the lighting fixtures and otherequipment covered under this package for effecting any changes in the originals.This work shall be done immediately after completion of erection work in aparticular area. Price quoted by the contractor shall be inclusive of furnishing of theabove drawings.

General Information

The design and workmanship shall be in accordance with the best Engineeringpractices to ensure satisfactory performance and service life as specified herein.

Contractor shall provide adequate and capable manpower and supervision for

electrical installation work covered under this contract. The staff provided shall beadequate to provide detailed supervision at each stage / site of the work and shall belicensed to handle respective jobs to satisfy the requirements of the electric supplyand other connected authorities.

The Contractor shall have to clean all equipment under erection, as well as the workarea and site at regular intervals to the satisfaction of the owner/Engineer. In casethe cleaning is not to Owners satisfaction, he will have the right to carry out thecleaning operations and expenditure incurred by the Owner in this regard will be tothe Contractors account.

Types and makes of all the bought out electrical items shall be subject to NTPCSapproval.

Storage Cum Erection Insurance

All the equipment and material being supplied by the Contractor shall be keptcompletely insured by the Contractor at his cost from the time of dispatch from themanufacturers works up to the completion of erection, testing and commissioning atsite and taking over by the Owner.

It will be the responsibility of the contractor to lodge, pursue and settle all claims withthe insurance company in case of any damage, loss, theft, flood, earthquake,pilferage or fire etc. and the owner shall be kept informed about it. The losses, if any,will have to be borne by the Contractor, if the claims are not lodged and pursuedproperly or in time or if the same are not settled by the Insurance Company.

Site Conditions

All equipments shall be designed for an ambient temperature of 50 deg. C. and100% Relative Humidity. It is the responsibility of the contractor to survey the siteand acquaint himself to prevailing site conditions before quoting. Failure on thisaccount shall not relieve the contractor of his responsibility to execute the contract tosuit the site conditions.


Bid Doc. No. :

CS-9573-000-1


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Technical Requirements

LT Distribution boards

Codes and Standards

Distribution boards & components shall conform to the requirements of the latestrevisions including amendments of the following codes and standards:

IS: 8623 Specification for factory built assemblies of switchgear and controlgear for voltages upto and including 1000V AC/1200V DC.

IS: 13947-I General requirements for switchgear and control gear for voltages notexceeding 1000V.

IS: 13947-I Degree of Protection provided by enclosures for lowVoltage switchgear and control gear.

IS: 10118 Code of practice for selection,installation and maintenanceof Switchgear & control gear

IS: 9224 HRC Cartridge fuses.

IS: 13947 Air break switches, Air break disconnectors, Air breakdisconnector and fuse combination units for voltages not exceeding1000 V AC or 1200V DC.

IS: 6005 Code of practice for phosphating of iron & steel.

General Description

(a) The panel shall be metal enclosed, single front, indoor, floor/wall mountedwith compartmentalized construction type. The panel shall be designed for adegree of protection of IP 52. The panel height shall not exceed 2100mm. Incase, horizontal bus bars at the top are provided, panel height up to 2450mmis also permitted.

(b) The panel shall be fabricated using pressed and shaped cold rolled sheetsteel of thickness not less than 2.0mm. Frames shall be enclosed by coldrolled sheet steel of thickness not less than 1.6mm. Doors and covers shallalso be of cold rolled sheet steel of thickness not less than 1.6mm. Stiffenersshall be provided wherever necessary.

(c) All cut outs & covers shall be provided with synthetic rubbergaskets.

(d) The panel shall be divided into distinct vertical sections each comprising of

i) A completely enclosed bus bar compartment for runninghorizontal and vertical bus bars.

ii) Completely enclosed switchgear compartment one for each circuitfor housing Switchfuse unit etc.

iii) A compartment alley for power and control cables of atleast 175mm width covering entire height.

(e) The front of each compartment shall be provided with the hingedsingle leaf door with locking facilities.


Bid Doc. No. :

CS-9573-000-1


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(f) Provision for installing Energymeters inside the panel on alloutgoing feeders for Residential buildings and on incomingfeeder for other buildings or as specified in BOQ/Drawings.

(g) Panel shall be provided with suitable fixing facilities.

(h) Isolators & switch fuse units shall be of fixed type, each feeder shall havecompartmentalized construction.

(i) Cable entry shall be from bottom / top as required

(j) The panel shall be provided with three phase buses and a neutral bus bar ofaluminium sections throughout the length of switchgear panel and shall beadequately supported and braced. Maximum temperature rise of bus barsand bus bar connections while carrying rated current shall not exceed 40degree C. over an ambient of 50 degree C.

(k) The minimum clearance in air between phases and between phase and

earth for the entire run of bus bars, bus bar connections shall be 25mm. Busbar support insulators shall be made of non hygroscopic non combustibletrack resistant & high strength type sheet moulded compound or equivalenttype fibre glass moulded material.

(l) All busbars shall be colour coded as per IS: 375.

(m) A galvanized steel earth bus shall be provided at the bottom of the panelthroughout the length. The size of GI bus shall be equal to half the crosssectional area of phase bus.

(n) The outgoing feeders shall be switchfuse units or moulded case circuitbreakers(MCCBs).

Air break switches shall be of heavy duty, single throw, group operated AC22 category load break fault make type when associated with fuses andsuitable for 3 phase 415 V supply complying with IS: 4046. Switch operatinghandle shall be provided with padlocking facilities to lock them in off position. Interlocks shall be provided such that, it is possible to open thecubicle door only when the switch is in off position.MCCBs shall conform to IS:13947(Part-2) in all respects. MCCBs shall besuitable for 3 phase 415V or single phase 230V AC. MCCBs shall be ofthermomagnetic or static release type.

(o) All fuses shall be of HRC cartridge fuse link type and shall be rated for 80 KArms breaking capacity at 415V AC..

(p) The neutral link shall be mounted on fuse carriers which shall be mounted onfuse bases.

(q) Indicating lamps shall be of the panel mounting, Cluster LED type and shallhave escutcheon plates marked with its function wherever necessary. Thecolour of the translucent lamp cover shall be Red for ON and Green forOFF.


Bid Doc. No. :

CS-9573-000-1


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Name Plates and Labels

(a) Panel and all modules shall be provided with prominent, engravedidentification plates. The module identification plate shall clearly give thefeeder number and feeder designation.

(b) All name plates shall be of non rusting metal or 3 Ply lamicoid with whiteengraved lettering on black background. Inscriptions and lettering sizes shallbe subject to Owners approval.

(c) Suitable stenciled paint mark shall be provided inside the panel/moduleidentification of all equipment in addition to the plastic sticker tables, ifprovided. These labels shall be positioned so as to be clearly visible andshall have the device number, as mentioned in module wiring drawings.

Power Cables/Conduits Termination

(a) Cable termination compartment and arrangement for power cables shall besuitable for 1100 V grade standard aluminium conductor, armoured, PVC

insulated and sheathed. cables.

(b) All necessary cable terminating accessories such as Gland plates,supporting clamps and brackets, power cable lugs, hardware etc. shall beprovided by the contractor and to be included in the quoted price ofDistribution Board.

(c) The gland plates shall be removable type and shall cover the entire cablealley. Bidder shall ensure that sufficient space is provided for all cableglands. For all single core cables, gland plates shall be of non magneticmaterial.

(d) Suitable arrangement and space shall be provided for connection

of outgoing feeders in conduits, if required.

Painting

All sheet steelwork shall be pretreated, in tanks, in accordance with IS:6005. Thephosphate coating shall be Class-C as specified in IS:6005. The phosphatedsurfaces shall be rinsed and passivated prior to application of stoved lead oxideprimer coating. After primer application, Electrostatic powder painting shall beapplied. Finishing paint shade shall be RAL 9002 unless otherwise required by theowner.The paint thickness shall not be less than 50 microns. Finished parts shall becoated by pealable compound by spraying method to protect the finished surfacesfrom scratches, grease dirt and oily spots during testing, transportation, handing anderection. All hardware shall be Nickle/Cadmium plated. The pad locking plate shall

also be suitably painted to avoid rusting.

Lighting Panels

Lighting panels shall be metal enclosed,single front, indoor, recess/surface mountingtype. constructed out of 1.2 mm thick CRCA sheet steel. The main door shall behinged and the panel shall be gasketted with degree of protection of IP-42. Thepanel shall be provided with terminal blocks for incoming and outgoing circuits,earthing terminals, M.S. mounting brackets suitable for surface mounting on


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CS-9573-000-1


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wall/column/structure(as applicable), latching arrangement for door,circuit directoryplate & circuit diagram fitted on the inside of the door etc. Removable gland platesshall be provided for entry of cables/conduits. The quoted price of Lighting panelshall include cable glands and lugs of suitable sizes for all incoming & outgoingfeeders.

Wiring inside the panel shall be carried out with 1100 V grade. PVC insulatedstranded copper wires of adequate size. On both ends of each wire engravedidentification ferrules shall be provided.

The Lighting panels shall be of three phase or single phase type with incomingIsolator/ELCB and outgoing MCBs as per requirement. All MCBs/ ELCBs/Isolators/Switches etc. shall be mounted inside the panel with the front cover. Onlythe operating knobs of Isolators/ELCBs/MCBs etc., shall project out of the frontcover, through neatly machine made opening, for safe operation against accidentalcontact. The front cover with Isolators/ELCBs/MCBs shall be covered by the hingedmain door. The busbars shall be made of solid electrolytic copper of appropriatecross-section with plug-in or bolted type Isolators/ELCBs/ MCBs. Neutral busbarsshall be provided for adequate no. of terminals as required. An earth bar of similar

size as the neutral bar shall also be provided. Phase barriers shall be fitted and alllive parts shall be adequately covered by the front cover. Adequate clearance shallbe provided between phases and between phase & earth.

Equipment mounted inside the panel shall be provided with individual labels withequipment designation/rating. Main door of the panel shall be provided with labelengraved with designation of the panel as furnished by the employer. Labels shallbe made of 3 ply lamicoid/engraved PVC having white letters on black background.

Adequate space shall be provided for terminating incoming & outgoing cables/wires.Terminal bocks shall be of 750 V grade, clip-on stud type for cables and screw typemoulded in melamine for wires, suitable for terminating multicore stranded

aluminium/copper conductor cables/wires of the required sizes forincoming/outgoing feeders. All terminals shall be shrouded, numbered and providedwith identification strip for the feeders.

MCBs shall be current limiting type with magnetic and thermal release suitable formanual closing and automatic tripping under fault condition. MCBs shall have shortcircuit interrupting capacity of 9 KA rms. MCB knob shall be marked with ON/OFFindication. A trip free release shall be provided to ensure tripping on fault even if theknob is held in ON position. MCB terminal shall be shrouded to avoid accidentalcontact.

The exterior side of panel, shall be powder coated with smoke grey,

shade RAL9002 and the interior side of the panels shall be white.

ELCBs shall be Electro-mechanical, self immuned type having inbuilt filter to avoidnuisance tripping.


Bid Doc. No. :

CS-9573-000-1


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Cable glands & lugs

The cost of cable glands and lugs shall be included in the quoted price of therespective Distribution Board/Lighting Panel for which these are to be provided fortermination of cables/wires.

Cable glands shall be of compression type, made of tin plated heavy dutybrass castings & machine finished. Glands shall be of robustconstruction capable of clamping cable & cable armour, firmly withoutinjury to the cable. All washers & hardware shall be made of brasstinned. Rubber components used in the glands shall be made ofneoprene/ synthetic rubber of tested quality.

Cable lugs shall be aluminium alloy solderless crimping type conforming to IS:8309suitable for aluminium conductors. Crimping of terminals shall be done by usingcorrosion inhabitory compound. Cable lugs for copper cables shall be made oftinned copper and shall be provided with insulating sleeve.

Cables & Wires

LT Power cables shall be of 1.1KV grade, multicore, stranded aluminiumConductor ,PVC insulated, PVC innersheathed, unarmoured, PVC outersheathedconforming to IS:1554(Part-1).

PVC wires shall be of 1.1 KV grade, PVC insulated, single core,stranded, copper / aluminium conductor conforming to IS:694. The wiresshall be colour coded for R.Y.B. phases and neutral.

Receptacles

Receptacles shall be fabricated out of MS sheet of 2mm thick and hot dip galvanised

or of die-cast aluminium alloy of thickness not less than 2.5 mm. The boxes shall beprovided with two nos. earthing terminals, and gasket to achieve degree ofprotection, terminal block for loop-in loop-out, of wire/cable of specified size,

mounting brackets suitable for surface mounting on wall/column/structure, conduitentry/gland plate etc. Thedegree of protection for 63A, 415V,TPN receptacle shall beIP-55. The On/OFF switches shall be rotary type, heavy duty, double break, AC 23

category, suitable for AC supply.

Plug & socket shall be of shrouded die-cast aluminium. Socket shall be providedwith lid safety cover. Robust mechanical interlock shall be provided for receptaclestype RA such that the switch can be put ON only when the plug is fully engaged andplug can be withdrawn only when the switch is in Off position. Wiring inside the boxshall be carried out with 1100 V grade PVC insulated stranded aluminium/copper

wire of adequate size. The terminal block shall be of 750 V grade, clip on/ stud type,moulded in Melamine, suitable for terminating cables of suitable sizes. All the

terminals shall be shrouded. The rating of receptacles shall be 63A,415V,TPN,5-pinor 20A,240V,SPN,3-pin as per BOQ.


Bid Doc. No. :

CS-9573-000-1


PART-B

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Switches & Socket outlets

Lighting Switches/ Boxes

(a) The switch boxes shall be of bent steel construction, fabricated of 1.6 mmthick M.S.Sheets. The boxes shall be hot-dip galvanized. The switch boxes

shall be provided with earth terminal.

(b) The switch boxes shall be flush mounted in walls.

(c) The switch boxes shall have conduit knock-out on all four sides.

(d) Switches shall be of decorative modular type having quick-make, quick-breakmechanism, provided with position marking.The switches shall be suitable forsingle phase, 240V, 50 Hz, supply and shall be suitable for terminating twowires of 1.5 sq.mm. in each bore.

Socket outlets/ Boxes

(a) Socket outlet box shall consist of modular socket outlet with associatedswitch. The socket outlet and switch shall be flush mounted on a box whichshall be suitable for recessed mounting into walls.

(b) The socket outlet boxes shall be fabricated from 1.6mm thick M.S.Sheets.The boxes shall be hot dip galvanized. The boxes shall have conduit knock-outs on all sides. The socket outlet box shall have one earth terminal.

Conduits & Accessories

PVC conduits shall fully conform to IS:9537(part-3) 1983.

The conduit shall be of approved make suitable for medium duty.

The conduits shall be straight and to be supplied in standard length.Themanufacturers name shall be stamped on each length.

All accessories / fittings required for making the conduits installation complete,including but not limited to couplers, bends, ordinary and inspection tees andelbows, reducers, enlargers, male and female bushings, G.I. wires for cable/ wirepulling, terminal boxes, & pull out boxes complete with glands, gaskets and covers,plugs, saddles, clips, spacing plates, nuts, bolts and screws, other clampingmaterials and all necessary supporting steel work shall be supplied by the contractoralongwith the conduits. The requirements of these shall be estimated based on theconduit layout drawings prepared by the Contractor and approved by the Owner.The price of the accessories / fittings shall be included in the erection price of items

quoted. Conduit accessories shall be of PVC. Conduits shall be joined together bya vinyle type cement/solvent. Minimum size of the conduit shall be 20mm.Fortermination of PVC conduits into switch/outlet/junction boxes,PVC female adoptersshall be used. Conduits shall be bent using springs of suitable size. Long radiusbends shall be provided. Heating shall not be used to bend the conduits. Size ofconduit shall depend upon number & sizes of wires to be drawn.

The terminal boxes/pulL boxes shall be of circular/rectangular shape made ofPVC.The boxes shall be complete with conduit knock outs/adaptors etc.Cover plates


Bid Doc. No. :

CS-9573-000-1


PART-B

PART-B



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such as piping, air ducting, cable tray/bus duct hangers, structural bracing etc. in aparticular area, have been installed.

After installation of lighting fixtures/socket outlets, panel number and circuit numbershall be painted on them at a suitable place in non-residential buildings.

Lighting Fixtures, Fans and Accessories

The type of fixture mounting will generally be indicated on the layout drawing. Theexact mounting will however be decided at site depending upon the actualspace/other facilities available at site.

Wooden plugs in walls and ceilings for fixing of lighting fixtures and accessories arenot acceptable. A suitable fool-proof method (preferably using nylon rawl plug) forfixing these shall be offered and this shall be subject to the Owners approval.

Flood lights shall be mounted on steel base facing the tentative direction shown ondrawings. Fixing holes shall be provided with slot to turn the fixtures by about 5degree on both sides. Bolts shall be tightened with spring washers. Terminal

connection to the flood lights shall be made through flexible conduits.

In the rooms, where false ceilings are provided, the lighting fixtures shall besupported separately from roof slab and not from false ceiling. The erection rate oflighting fixtures shall include the supply of all steel brackets, supporting, anchoringmaterial and hardware, also steel brackets/hangers for bridging the gap above falseceiling etc. required for installation of lighting fixtures.

Distribution Boards & Lighting Panels

Distribution Boards including Meter Boards, shall be mounted on wall/floor andLighting Panels shall be mounted on the walls/columns/steel structures at thelocations indicated in the drawings.

Lighting Panels shall be installed by fastening to studs of not less than 12mm diawhich will be suitably grouted/welded to the wall/column by the Contractor.

The erection rate of Dist.Boards/Lighting panels shall include the supply of all steelbrackets, supporting, anchoring material and hardware and required accessories forthe erection of the panel.

Lighting Switches/ Boxes & Socket outlets/ Boxes

The locations of switch/socket outlet boxes shall be tentatively shown on thedrawings. The exact location shall be finalized by the Contractor in consultation withthe Engineer-in-Charge.

All switches/socket outlets shall be flush mounted in the wall.

Unless otherwise noted on the drawings, the height of the followingfixtures/accessories, from finished floor level, shall be as follows:

(a) Lighting panels - 1500mm


Bid Doc. No. :

CS-9573-000-1


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(b) Lighting Switch Boxes - 1200mm

(c) Light Fixtures, wall bracket/exhaust fans - 2300mm

(d) Socket outlet Boxes - 300mm (in general)

- 1500mm (for Geyser)

(e) Ceiling Fans - 2500mm

(f) Telephone Tag block/outlet boxes - 300mm

/tap-off/outlet boxes

Conduits and Accessories

Size of conduit shall be selected as per the table given below:

Size of Wire Conduit Size / Max. Number of Wires

20 mm 25 mm 32 mm1.5 sq.mm. 5 10 142.5 sq.mm. 5 8 124.0 sq.mm. 3 6 106.0 sq.mm. 2 5 810 sq.mm. - 3 516 sq.mm. - - 3

Embedded conduit shall be securely fixed in position to avoid any movements.

Spacing of embedded conduits shall permit flow of concrete between them and in nocase shall be less than 40mm.

For direct embedding in soil, GI/PVC pipe shall be used. Concrete pier or anchorshall be provided, where necessary, to support the GI pipe rigidly and to hold it inplace.

For long conduit runs, junction/pull boxes shall be provided at suitable intervals (notexceeding 10 m) to facilitate wiring.

Conduits shall be securely terminated at LPs /junction boxes of lightingfixtures/fans/call bells by proper fastening with a lock nut on inside and outside. Thenumber of conduits terminating at LPs shall not exceed the permissible numberconsidering the glanding area of lighting panel. Conduit terminations shall be madewater and vermin proof.

Conduits shall be cleanly cut. Cut ends shall be reamed and all burrs and sharpedges removed.

After installation the conduits shall be cleaned before pulling in the wire.

Conduits and fittings shall be properly protected during construction period againstmechanical injury. Conduit ends shall be plugged or capped to prevent entry offoreign materials.


Bid Doc. No. :

CS-9573-000-1


PART-B

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Lighting fixtures shall not be suspended directly from the junction box in the mainconduit run.

Cabling/Wiring

The cables/wires from Distribution boards to Lighting panels shall be laid on cabletrays/clamped on wall/in GI/PVC conduits of required size, as per BOQ. The wiresfrom lighting panels to switch/socket outlet boxes and switch boxes to lightingfixtures/Fan boxes/call bells shall run in conduits.

All wires in a conduit shall be drawn simultaneously. No subsequent drawing ispermissible.

Wires shall not be pulled through more than two equivalent 90 degree bends in asingle conduit run. Wherever required, suitable conduit pull boxes shall be provided.All types of wiring concealed or unconcealed shall be accessible of easy inspection.

Power Sockets and lighting circuits shall be fed from different circuits.The switch

controlling these circuits shall be on the live side (phase wire) of the circuit.

Separate conduits shall be used for light, power, telephone & T.V. circuits.

Wiring shall be spliced only at terminal blocks. Maximum of two wires shall beconnected at each terminal. Terminal blocks shall be of 650V grade screw typemoulded in melamine suitable for loop-in loop-out of upto 4 sqmm stranded copperwires and tap off of 1.5 sqmm copper wire.

In vertical run of wires in conduit, the wires shall be suitably supported by means ofhard rubber plugs at each pull/terminal box.

1100V grade, PVC insulated wires of different size shall be used for following

purposes:

(a)Light Fixture / fan (ceiling, wall 2.5 mm2 stranded Cubracket,exhaust)/call bell / 5 A socket Conductor(Point wiring from switches onwards)(b) Circuit wiring for light points 4 mm2 Stranded Cu(from lighting panel to switch box) Conductor(c) Single power socket (15A) 4 mm2 stranded Cu

conductor(d) Two power sockets (15A) 6 mm2 stranded Cu.

conductor

All lighting wires of more than 6 sq.mm. size shall be crimped using suitable type of

solderless, crimping, tinned fork type copper lugs.

There shall be maximum of two power points on each circuit. Wiring for first pointshall be carried out with 2x6sqmm copper wire while for the second point, it shall becarried out with 2x4 sqmm copper wires. Wiring for first point include wiring fromlighting panel to first point and the wiring for second point shall include wiring fromfirst point to second point.


Bid Doc. No. :

CS-9573-000-1


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Point wiring shall include the cost of conduits, wires, earth wire, switch/socket outletboxes, switches, cover plates, terminal boxes alongwith connectors, pull boxes allhardware & accessories etc. as required to complete the installation.

Point wiring shall include the following:

(a) Wiring from lighting panel to switch board/socket outlet.(b) Switchboard & switches, socket outlets with cover plates(c) Wiring from switch board to light/fan/socket/bell including earth wire etc.(d) All necessary PVC conduits,fittings with accessories.

Separate switch boxes/socket outlet boxes shall be provided for different circuits.Power & lighting circuits, should not be mixed up in the same switch box/socketoutlet box.

Each circuit shall have independent neutral wire complete upto outlet box and switchbox.

Earthing of the third pin shall be included in the point wiring of socket outlets. Earth

pin shall be connected to socket outlet box earth terminal by flexible copperbraid/wire.

In case of more than one light point controlled by the same switch, the wiring uptothe terminal block or any other approved terminations of the first light point includingthe switch shall be considered as a primary point, loop wiring from light to light shallbe considered as secondary point and the distinguishing rate shall be quoted.The maximum no. of Points controlled by one switch of 5 Amps. are as follows:

(a) 2x36 Watts F.L.Fixtures 3 Nos.(b) 1x36 Watts F.L. Fixture 6 Nos.(c) 18 Watts CFL Fixtures 5 Nos.

Lights, fans, 5 Amps. socket outlet and bell push etc. may be wired on a commoncircuit. Such sub-circuits shall not have more than a total of 8 points of lights, fans &sockets outlets. The load of each circuit shall be restricted to 800 Watts.

There shall not be more than two power socket outlets on each circuit.

Cabling Work

The cost of laying of cable shall include all clamping, fixing, crimping, drilling, cutting,fixing glands, connecting to terminal blocks, grounding etc. as required to completethe job.

Size of glands & lugs shall be as per the size of the cables/wires, selected during

detailed engineering.

All cable entry points shall be sealed and made vermin & dust proof. Unusedopenings shall be effectively closed.

Each cable shall be tagged with the cable no. as per cable schedule. The tags shallbe of rectangular shape & attached to the cable by not less than two turns of 20SWG G.I. wire. Cable tags shall be provided at each end of the cable beforeentering the equipment enclosure, on both sides of wall or floor crossing and at


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CS-9573-000-1


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every 30 M of cable runs. Cost of the tags shall be included in the erection of thecables.

Cutting of slabs/beams/columns and exposing reinforcement are strictly prohibited.Contractor shall use dash fasteners of adequate strength for supports from RCCstructure.

Earthing System

Earthing system shall be in accordance with IS:3043 and Indian Electricity Rules,Codes of practice and regulations existing in the location where the system is beinginstalled.

Pipe Earth electrode for earthing station shall compriseof medium class GI pipe of40 mm. nominal dia and 2.5 mtr. Long. Bottom half of the pipe shall have holesdrilled at intervals of 7.5 cms. on its surface. Removable caps shall be provided atthe top of its pipe to facilitate pouring of water. Suitable clamps shall be providedwith the electrodes for connecting earth conductors. The top of the earth electrodesshall be about 100 mm below ground level. While connection to the earth conductor

shall be made at 150 mm below ground level. The top portion of the electrodes shallbe enclosed in 300x300x300 mm M 15 concrete housing and provide with concretetop cover and mark. Provision shall be kept at each earth station for testingresistance. Earth station shall be complete with alternate layers of charcoal and salt.

Plate Earthing shall comprise of GI plate electrode of size 600mmx600mmx6.3mmthickness. The electrode shall be buried in ground with its faces vertical and not lessthan 3 meters below ground level. 20mm dia. Medium class GI pipe shall beprovided and attached to the electrode. A funnel with mesh shall be provided on topof this pipe for watering earth electrode. The watering funnel attachment shall be beenclosed in 300x300x300 mm M 15 concrete housing and provide with concrete topcover and mark. Provision shall be kept at each earth station for testing resistance.Earth station shall be complete with alternate layers of charcoal and salt.

GI strip of 25x6mm shall be used as earth conductor directly buried in ground & shallbe provided with one coat of bituminized paint, one layer of half lapped bituminisedtape and a final coat of bituminised paint to prevent corrosion.

Galvanized M.S.Saddles shall be used for clamping earth conductor on cabletrays/structures/walls/ceiling etc. The saddles shall be clamped to M.S. flat spacerswith tapped holes and supporting the earth conductors. Flats shall be supported atinterval not exceeding 1000 mm and stranded wires at an interval of 500 mm.

As far as possible all earth terminations and connections shall be visible forinspection. Each earthing system shall be so designed that testing of individualelectrode is easily possible.

Connection of earthing leads to earth electrodes shall be made by means of bolting.

The earth conductors shall be free from pitting, laminations, rust, scale and otherelectrical/mechanical defects. The material of the earthing conductors shall begalvanized steel/copper as specified.


Bid Doc. No. :

CS-9573-000-1


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Metallic frame of all electrical equipment shall be:

(a) Earthed by two separate and distinct connections to earthing system(b) Metallic sheaths, screens and armour of all multicore cables shall be earthed

at both equipment and panel/DB.(c) Lighting fixtures, fans, socket outlets, conduits, JBs, switch boxes, socket

outlet boxes shall be earthed with 18 SWG bare copper wire. Single phasePower socket outlets shall be earthed with 14 SWG bare copper wire. Threephase Receptacles shall be earthed with 8 SWG bare copper wire.

(d) Distribution boards shall be earthed with 50x6mm GS.flat.(e) Lighting panels shall be earthed with 8SWG GI wire.

Neutral connections shall not be used for the equipment earthing. Metallicconduits/pipes shall not be used as earth continuity.

a) Connections between earth leads and equipment shall be normally of boltedtype. Contact surface shall be thoroughly cleaned before connections.Equipment bolted connections, after being tested and checked, shall bepainted with anti-corrosive paint/compound.

(b) Resistance of the joints shall not be more than the resistance of theequivalent length of conductor.

(c) All welded connections shall be made by electric arc welding with lowhydrogen content electrodes.

(a) Earthing conductors buried in ground shall be laid minimum 600 mm belowgrade level unless otherwise indicated in the drawing. Back filling material,placed over buried conductors, shall be free from stones and harmfulmixture. Back filling shall be placed in the layer of 150mm.

(b) Earthing conductors embedded in the concrete floor of the building shall

have approximately 50mm concrete cover.

(c) A minimum earth coverage of 300mm shall be provided between earthconductor and the bottom of trench/foundation/underground pipes atcrossings. Earthing conductors crossing the road can be installed in thehume pipes.

Normally an earth electrode shall not be situated less than 2 m from any building.The location of earth electrode shall be such where the soil has reasonable chanceof remaining moist, as far as possible. Entrances, pavements, roadways and metalfence are definitely avoided, for locating the earth electrode.

Minimum spacing between electrodes shall be 6000mm.

Complete building earthing system shall be fully tested in accordance with therelevant clauses of applicable standards.

On completion of installation, continuity of earth conductors and efficiency of allbonds & joints shall be checked. Earth resistivity at earth terminations shall bemeasured in presence of Owners representatives. All equipment required fortesting shall be furnished by contractor.


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CS-9573-000-1


PART-B

PART-B



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Lightning Protection System

The Lightning protection of the building shall be provided as per IS:2309. G.I.Stripsof 25x6mm shall be fixed for both horizontal and vertical conductors. GalvanizedM.S.Saddles shall be used for fixing the strips on parapet walls/on vertical runs. All

down conductors shall be provided with Test joints. The min. size GI strips used fordirectly burried in ground shall be 25x6mm. The code of practice shall be as perIS:2309.

Down conductor shall be cleated on outer side of building wall, at 750mm interval orwelded to outside building column at 1000mm interval.

All metallic structures, within the vicinity of 2 mtr. of any conductor of lightningprotection system, shall be bonded to the conductor of lightning protection system.

Foundations & Civil Works

Equipment foundations, panel foundation and other materials as per relevantdrawings and specifications clauses shall be provided by the Contractor.

Any cutting of masonry/concrete work, which is necessary shall be done by theContractor at his own cost and shall be made good to match the original work. Thecontractor shall obtain approval of the Engineer before proceeding with any cuttingof masonry/concrete work.

The contractor shall perform all excavation and backfilling as required for groundconnections and casting foundations.

Excavation shall be performed upto the required depth.

The contractor shall make use of his own arrangement for pumping out any waterthat may be accumulated in the excavation.

All excavation shall be backfilled to the original level with good consolidation andsurplus soil shall be disposed off as per the instruction of site engineer.

Testing of Equipment & Installation

Testing of Equipment

All equipment to be supplied shall be of type tested quality.

All acceptance and routine tests as per the specification, QA tables and relevantstandards shall be carried out. Charges for these shall be deemed to be included inthe equipment price.

Testing of Installation

Inspection & testing of the installation shall be carried out as per Part-1, Section 10of the National Electrical Code 1985.


Bid Doc. No. :

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The contractor shall be responsible for providing the necessary instruments andsubsidiary earth for carrying out the tests. The earth continuity test shall comply withthe relevant IS Standards. In case, the results of above tests do not comply with thelimits laid down, the contractor shall rectify the faults until the required results areobtained.

Field Quality Assurance Programme (FQAP)

Bidder shall furnish a FQAP for all equipment and accessories used for the QualityAssurance. The Field Quality Assurance Programme of the bidder shall generallycover the following:

(a) Organisational structure for the management and implementation of theproposed FQAP.

(b) Documentation Control System.

(c) Qualification data for Bidders key personnel.

(d) The procedure for purchase of material, parts, components and selection ofsub contractors service including vendor analysis source inspection,incoming raw-material inspection, verification of material purchased etc.

(e) System for shop manufacturing controls including process controls,fabrication and assembly controls.

(f) Control of non-conforming items and system for corrective actions.

(g) Inspection and test procedure both for manufacture and field activities.

(h) Control of calibration and testing of measuring and testing equipments.

(i) System for indication and appraisal of inspection status.

(j) System for quality audit.

(k) System for authority release of manufactured product to the owner.

(l) System for handling, storage and delivery.

(m) System for maintenance of records.

(n) Quality plan detailing out the specific quality control procedure adopted forcontrolling the quality characteristic relevant to each item or equipmentfurnished.

(o) System for controlling site activities i.e. receipt, storage, pre- erection,erection and commissioning.


Bid Doc. No. :

CS-9573-000-1


PART-B

PART-B



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ANNEXURE

TECHNICAL INFORMATION AND DATA TO BE SUBMITTED WITH THEPROPOSAL

Bidder shall give the details of his previous experience for the similar jobs done byhim till this date.

Drawings and Literature:

The following information and drawings of the proposed equipment shall besubmitted in four (4) copies by the bidder along with his proposal as separateappendices to the proposal.

Complete technical literature supported by catalogues, as applicable, indicating themakes, constructional features, type of material, and any other relevant information

and Type Test Certificates for

(a) Socket outlets & boxes

(b) Switches & switch boxes

(c) Conduits & conduit accessories

(d) Electric cables & wires

(e) Terminals, glands & lugs

(f) Distribution Boards/Lighting panels alongwith following components

(i) Switches / switch fuse units/MCCBs(ii) ELCBs,Miniature Circuit Breakers(iii) Meter boxes

(g) Earthing/Lightning protection materials


Bid Doc. No. :

CS-9573-000-1


PART B

PART-B


Technical Specification of Ie

Documents