Tender document (volume-ii) (Scope of Works, Technical Specification, List of approved makes, Tender Drawings) nit no. Nro/con/esic-wiring/501


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TENDER DOCUMENT


(VOLUME-II)
(Scope of Works, Technical Specification, List of approved makes, Tender Drawings)
NIT NO. : NRO/CON/ESIC-WIRING/501




ELECTRICAL WIRING FOR UPGRADATION AT ‘B’, ‘C’, ‘D’ TYPE ESIC STAFF QUARTERS AT

AF-BLOCK AT SALTLAKE, KOLKATA


ISSUED TO

________________________________
________________________________


ENGINEERING PROJECTS (INDIA) LIMITED

SCOPE COMPLEX, CORE –III, LODHI ROAD,

NEW DELHI:110003

1. Introduction
1.1 Information about the site :

Existing ESIC Staff quarters at AF-Block at Saltlake ,Kolkata, West Bengal.

1.2 SCOPE OF WORK




The brief scope of work included in this tender shall include (but not limited to) electrical upgradation works at ‘B’, ‘C’, ‘D’ type ESIC Staff quarters at AF-Block at Saltlake, Kolkata.

GENERAL TECHNICAL SPECIFICATION :
2.0 GENERAL SPECIFICATION

2.1 The work in general shall be carried out as per CPWD specifications, 1996 (volume I to VI) (updated with correction slips issued up to last date of submission of tender) and text of revised CPWD specifications for cement mortar, cement concrete and RCC works, 2002 unless otherwise specified in the nomenclature of the individual item or in the particular specifications for civil works and CPWD specifications, 1994 for Electrical works (Internal) and 1995 for Electrical works (External) (updated with correction slips issued up to last date of submission of tender).

2.2 All Electrical installation shall comply with the requirements of Indian Electricity rules,1956 and Indian Electricity Act-1910 as amended up to date and bye laws of authority of State Government or any other department.

2.3 All mechanical works related to Public Health Engineering will conform to the requirements of manual of Water Supply by the Ministry of Urban Development and various Indian Standards as listed there-in.

2.4 All electrical works will conform to various Indian Codes as listed in the Technical Specifications.

2.5 For the items not covered under the specifications as stated above, the work shall be done as per relevant IS Codes.

2.6 For the items not covered under any of the specifications stated above, the work shall be executed as per Manufacturer’s specifications/ General Engineering Practice and / or as per direction of Engineer in Charge.
2.7 ADDITIONAL PARTICULAR SPECIFICATION

In the absence of any definite provisions or any particular issue in the aforesaid specification, reference to be made to the latest codes and specifications of BIS, IRC, BS, ASTM, AASHTO and CAN/CAS in that order. Where even these are silent, the construction and completion of works shall conform to sound Engineering practice as approved by Engineer in Charge. In case of any dispute arises out of the interpretation of the above, the decision of the Engineer in charge shall be final and binding on the contractor.

Where ever reference is made in the contract to specific standard codes to be met by the materials, plants and other supplies to be furnished and work performed and tested, the latest edition or revision of the relevant codes in effect shall apply, unless otherwise explicitly stated in the contract. Where such standards and codes are national, or related to a particular country of region, other internationally recognized standards which ensure a substantially equal or higher performance than the standards and codes specified will be accepted subject to the Engineer in charge prior review and written approval. Differences between standards must be fully described in writing by the contractor and submitted to the Engineer in Charge at least 15 days prior to the date when contractor desires the Engineer in Charge‘s approval. If the Engineer in Charge determines that such proposed deviation do not ensure substantially equal performance, the contractor shall comply with the standards specified in the documents.
3. TECHNICAL SPECIFICATION FOR ELECTRICAL WORK

SCOPE
This specification covers supply of materials, fabrication, and erection, testing and commissioning of Electrical system as per BOQ. Applicable provisions and conditions of contract shall govern the work under the Section.
GENERAL
The power supply system in the building & retail outlet stations shall be made available at 415/240 Volts, 50 Hz. A.C. 3 phase 4 wire, earthed neutral from local Electric Supply Authority.
All supply and installation work shall be carried out as per specification and in accordance with the construction drawings and shall conform to requirements called for in the Indian Electricity Rules 1956 with its latest amendment, Indian Electricity Acts and all relevant codes and practices issued by the Bureau of Indian Standard as amended up to date. The work shall also comply with the provisions of the general or local set of legislatures and regulations of any local or other statutory authority which may be applicable.
The Contractor for electrical work must possess valid Electrical contractor's License endorsed by the Licensing Board, Directorate of Electricity of concerned State Government for the type of work he shall execute.
The work to be provided for by the Contractor, unless otherwise specified, shall include but not limited to the following :
i: Furnish all labour, supervision, services, materials, supports, scaffolds, construction equipment, tools, plants and transportation etc required for the proper execution of the job as per drawings, specification and schedule of items and get all necessary tests on materials and work conducted at their cost.
ii: Not withstanding the electrical layout shown in the drawing, the contractor shall obtain further approval of the layout at site from the Consultant / Engineer in Charge before commencement of the work.
iii: Furnish samples of materials on display board at site for approval including arranging necessary tests on samples, as directed by the Consultant / Engineer in Charge in an approved Laboratory.
iv: To extend facilities to the Consultant / Engineer in Charge to inspect work and assist them to obtain samples, if they so desire.
v: Furnish general arrangement drawings of the switchboard and other fabrication items, which the Consultant / Engineer in Charge may direct for their approval.
vi: To employ a full time experienced supervisor having electrical supervisor's certificate of competency endorsed by the Licensing Board, Directorate of Electricity of concerned State to supervise the work. The Consultant / Engineer in Charge have the right to stop the work if the contractor's supervisor is not present when the work is being carried out.
vii: To keep the appropriate Electrical Inspector & supply authority be informed from time to time as per the execution programme of the work shall be the responsibility of the contractor and he shall be responsible to ensuring that all work passes their approval.
viii: To provide all incidental items not shown or specified in particular but necessary for proper execution of works in accordance with the drawing, specification and schedule of items.
ix: To maintain the work and keep them maintained till handed over to the owner in proper working condition.
x: Co ordinate with all agencies including those engaged by the owner for proper execution of the job.
MATERIALS
Materials shall be of the approved make & quality. A list of materials of approved brand and manufacturer is indicated in the annexure. If the list of materials mentioned above stipulates two or more or alternative brands/makes of any product, the decision as to which brand/make shall be used in the work shall be taken by the Consultant/ Employer and the contractor shall provide the brand/make so selected without any extra cost.
In case, materials are required to be obtained from any manufacturer other than those listed on account of non availability then prior approval from Consultant will be necessary, supported by relevant test certificates qualifying the required standard. Further tests as directed by the Consultant shall also be carried out by the contractor at their own cost, if required.
Contractor shall obtain approval from the Consultant/ Employer of sample of all materials before placing order and the approved sample shall be carefully preserved on the display board in an appropriate manner at the site office for verification by the Consultant/ Employer.
For standard bought out items, the sizes manufactured by the firms listed shall prevail when there is discrepancy in the sizes mentioned in the schedule without any financial adjustment.
SPECIFICATIONS
Unless specifically mentioned otherwise, all applicable codes and standards published by the Bureau of Indian Standard and all other such publication as may be published by them after construction work starts, shall govern in respect of design, workmanship, quality and properties of material and method of testing.

SAFETY
All equipment shall be complete with approved safety devices wherever a potential hazard to personnel exists and with provision for safe access of personnel to and around equipment for operation and maintenance functions.
Special care shall be taken to ensure against entry of rats, lizards and other creeping reptiles which may create electrical short circuit inside live equipment.
DRAWINGS
On completion of all work the contractor shall furnish three copies of Ammonia print along with the original tracing of the following “As built” drawings to the Consultant without any extra cost.

I: Wiring diagram for final power / lighting distribution system showing the rating/ size of switchgear, cables, conduits, lighting fixtures and all accessories for individual installation.
ii Detailed general arrangement drawings of the switchboard complete with dimension in metric units.
iii Drawings showing the route of conduits and cables with sizes, lengths, sources and destination of all cables with the circuit designation number, etc.
iv Drawings showing the balancing of phases with connected load in each circuits, etc.
TEST CERTIFICATES AND INSTRUCTIONS
Unless specifically mentioned otherwise, the contractor shall furnish, in duplicate, Manufacturer's Test Certificate with the delivery of the equipment to the Consultant and Instruction Manual in English for operations and maintenance of equipment wherever required.
TESTING AND COMMISSIONING
Before each field test, the contractor shall obtain the permission from the site engineer and all tests shall be conducted in the presence of duly authorised representative. Records of each test shall be prepared immediately after the test and this record shall be signed by contractor's representative conducting the test and the site engineer attending the test. Copies of their record in quadruplicate shall be handed over to the Consultant/ Engineer in Charge.
A certificate in quadruplicate shall be furnished by the contractor countersigned by the certified supervisor under whose direct supervision the installation was carried out and the owner's site engineer. This certificate shall be in the prescribed forms in addition to the test certificate required by the Local Electric Supply Authorities. Recommended completion certificate’s Format is given in Appendix 'A'.
COMPLETION OF WORK
Each item of the electrical work shall be considered as complete in all respects only after obtaining permanent service connection from local power supply authority, energising, testing and final commissioning of the complete installation as directed by the Consultant/Engineer in Charge.
Payment on each item of electrical work shall be made as per measurement and proportionate to the quantum of work completed. In the event of any dispute with regard to the proportion of work complete, the decision of the Consultant/ Engineer in Charge shall be final and binding to the contractor.

PREAMBLE TO THE SCHEDULE OF WORK
The successful tenderer shall carefully go through the Clauses of Invitation to Tender, Specification, Schedule of Work and drawings and shall include in his rates any sum he may consider necessary to cover the fulfillment of the various clauses contained therein. Unit prices stated in the schedule of work against the item of work shall be inclusive of all installation, accessories and consumables necessary to complete the said work within the contemplation of the contract. Beyond the unit prices no extra amount will be paid for incidental contingent work and materials.

The quantities mentioned in the schedule of work are probable quantities and it must be clearly understood that the contract is not a lump sum contract, that the probable quantities, the value of the entire tender are only indicative and Employer does not in any way assure the tenderer or guarantee that the actual quantity of work would correspond to the probable quantities in the tender.
No change in unit rate will be admissible on any variation of quantity.

TECHNICAL SPECIFICATION FOR WIRING SYSTEM
SCOPE
This specification covers supply of materials, erection and commissioning of distribution wiring, connection to distribution boards, cable laying, earthing and miscellaneous items. Applicable provisions and conditions of contract shall govern the work under the section.
GENERAL
Work to be provided for by the Contractor, unless otherwise specified, shall include but not be limited to the following:
i: Furnishing of labour, materials, supports, scaffolds, transportation, etc required for the work.
ii: To provide all incidental items not shown or specified in particular but reasonably be implied or necessary for successful completion of the work in connection with the drawings, specification and schedule of items.
iii: To provide all supervision for proper execution of the work.
iv: To conduct and bear all costs in respect of any test advised.
After completion of supply and installation of wiring system and earthing, if any defect in the material or workmanship is found by the Consultant / Engineer in Charge, the contractor shall remove the same and supply better and approved materials at his own cost.
All precaution against theft and fire shall also be taken by the contractor.


MATERIALS
All materials used in the work shall be ISI approved quality and in its absence conforming to the IS Specification.
WIRING SYSTEM
The electric load of all lights, power outlets, etc. shall be balanced across the three phases.

Generally the final loading of any sub circuit for lights and fans shall not exceed 800 watts and shall not be connected to more than total 10 fans, lights, socket outlets, etc. Bell push if operated at low voltage shall be fed from a separate circuit of distribution board.
The 16 Amps sub circuit for power shall be connected to a maximum one 16 Amp. socket outlet or two 6 Amp. socket outlets.
A power circuit shall always be originating from a distribution board or MCB DB and the same shall run in a separate con­duit.
The point wiring shall mean wiring from one way of distribution board to point of utilisation of electricity i.e. where the load is applied and this shall include complete wiring from distribution board, supply and fixing of switch board, controlling switches, ceiling rose, batten holder and socket outlet, etc.
Insulated or covered earthing conductors where used, shall have green insulation braiding or covering as appropriate. Under no circumstances shall the colour green be used for other than earthing conductor. In addition where it is required, cables of different colours be used. For identification purposes the following system shall be employed :



Red or any colour (other than black or green)

For phase or switch wire

Black

For Neutral

Green

For earth



Unless otherwise mentioned in the schedule of quantities, single way porcelain/ bakelite terminal connectors with nickel plated brass inserts and screws to suit the conductor size shall be used for intermediate wiring/ joints in junction boxes and in switch boards or by any other method approved by the Consultant/ Engineer in Charge.
Distribution wiring in conduit to light, fan, plug points etc.shall be done in looping in system. In this system, no joints or connections shall be made anywhere of the system except at terminating points such as, at terminals of switches, ceiling roses, etc. and in case of socket outlets, at the socket terminals. Intermediate wiring joints of neutral wire in junction boxes will not be permitted.
In the looping back system of wiring on hard wood batten, the wiring shall be done without any junction or connector boxes on the line. All intermediate joints or connections shall be made in the switch board only. Intermediate wiring joints of neutral wire in the junction box will not be permitted


CONDUIT WIRING
All conduit shall be ISI marked and finished with galvanised or stove enamelled surface. All conduit accessories shall be con­forming to IS:2667-1988 and be threaded type. Conduit less than 20mm in diameter shall not be used. All conduits shall be 1.4 to 1.8 mm thickness below 32 mm dia. and 1.6 to 2.2 mm thickness for 32 mm dia. and above.

The conduit for each circuit shall be erected complete with necessary bushes before drawing in of any wire. Galvanised M.S. Spacer of 3 mm thick minimum shall be used between the conduit saddle and fixing surface. The saddle shall be fixed at an interval of not more than 750 mm apart for vertical run and 600 mm apart for horizontal run.
The joint in conduits shall be made by means of threaded couplers and threaded accessories only to ensure electrical continuity throughout. All pipes after cutting, the threading shall be carefully reemed out with special reamer to remove any burr and then painted immediately with an anti corrosive preservative after removing all traces of oil or grease. Junction boxes shall be provided with gasketed covers to render them dust and damp proof. The conduit accessories having pull outlet for conductors shall only be used in all conduit installation.
Where specified, P.V.C. conduit conforming to IS: 7537 (Part-III) shall be used. The thickness of P.V.C.conduit shall be adequate to withstand mechanical inju­ries. PVC conduit accessories conforming to IS: 3419 1976 shall be used along with P V C conduit.
The entire conduit system shall be effectively earthed by means of suitable earthing conductors and the resistance from any point to earth shall not be more than one OHM.
After installation of conduit pipes and fittings are completed in all respects, the exposed outer surfaces of the conduit and accessories shall be painted with two coats of approved enamel paints or aluminium paint over a coat of red oxide primer as required to match the surrounding wall finishing. To protect against rust the bare thread portion shall be painted with anti corrosive preservative.
CONCEALED WIRING
This system of wiring shall comply with all the requirements of surface conduit wiring system specified in Causes 5.1 to 5.6 in addition to the follow­ing points:
Making of chase : The chase in the wall shall be filled up neatly made and be of ample dimensions to permit the conduit to be fixed in the manner desired. In case of buildings under construction, chases shall be provided in the wall, ceiling etc. at the time of their construction and shall be filled up neatly after erection of conduit and brought to the original finish of the wall. Specially for ceiling, conduit shall be laid before casting.

Fixing of conduit in chase : The conduit in chase in the wall shall be fixed by means of staples or by means of saddles not more than 60 cm apart. Fixing of standard bends or elbows shall be avoided as far as practicable and all curves maintained by bending the conduit pipe itself with a long radius which will permit easy drawing of PVC insulated wires. All threaded joints of con­duits shall be treated with some approved preservative compound to secure protection against rust.
Inspection boxes : Suitable inspection boxes shall be provided to permit periodical inspection and to facilitate removal of wires, if necessary. These shall be provided with inspection box covers.
Types of accessories to be used : All outlets, such as switches, wall sockets, etc. may be either flush mounting type or of sur­face mounting type.
The outlet box shall be mounted flush with the wall. The metal box shall be effectively earthed with conduit by an approved means of earth attachment.
Fish wire : 1 x 18 SWG G.I. wire inside the conduit and accesso­ries to be provided with an extension of 250 mm at both the conduit ends.
Conduit laying in floor/ roof slabs before casting : M.S./ G.I./ rigid PVC (as specified in BOQ) shall be laid straight as far as practicable and properly placed including binding with the steel reinforcement rods with 22 SWG G.I. binding wire so that proper positions of conduits are maintained.
While laying the conduits for concealed wiring in the cealing / beams / columns / walls before casting, the contractor shall ensure that both ends of the conduit are plugged by means of dead end sockets or otherwise to prevent the entry of any for­eign material against conduit choking.
All precaution must be taken while laying the conduits in the slabs, R.C. walls, columns, etc. and the contractor shall recti­fy at his own cost, if any defects are found during process of drawing cables through the concealed prelaid conduits.
Each M.S. / G.I. conduit shall be provided with protruding length of 150 mm on free end of the conduits with sockets under the bottom level of slab/ beam.
Each rigid PVC conduit shall be provided with protrud­ing length of 150 mm on free end of the conduits under the bottom level of slab/ beam.
There shall be no intermediate joints in one straight run of conduit.
All ceiling outlets shall be terminated in a round M.S./ G.I. circular box (80 mm depth minimum)/ deep box to suit standard size ceiling rose or/ and rectangular M.S. junction box or Fan Hook Box as the case may be.
It will be mandatory for the contractor to get the layouts approved by the Engineer in charge/Consultant, measurements are checked when the conduits are laid and bound to steel reinforce­ment rods, before he can release the work for casting of slabs/ floor/ beams etc.
Connector Boxes, Draw in Box, Junction Boxes :
These shall be constructed from 16 SWG M.S. sheet and have M.S. cover. Minimum size for connector box is 150mm x 100mm and for Draw in Box is 100mm x 100mm with required depth upto 80mm.
Fan Hook Box : These shall be 100mm dia x 80mm depth, constructed from 14 SWG M.S. sheet and provided with one 12 mm dia. M.S. rod of 300mm long having 'U' bend inside the box.
Painting : Both inside & outside wall of switch board, connection box, draw in box and other M.S. accessories shall be painted with two coats of anti corrosive paint in addition to other painting instructions given elsewhere.
WIRES
Unless otherwise mentioned in the schedule of quantities, only single core PVC insulated / PVC insulated & sheathed cable consisting of multistrand / flexible copper conductor and of approved manufacturers conforming to relevant I.S. shall be used for wiring in conduit system.
The maximum number of wires drawn in one conduit shall not be greater than the recommended number given in the Table – 1 given in this section.
P V C INSULATED WIRING LAID ON HARD WOOD BATTEN
Unless otherwise mentioned in the schedule of quantities only single core PVC insulated wire of 1100 volts grade consisting of multistrand copper conductor conforming to I S :694 shall be used for exposed batten wiring.
All P V C wires shall run on well seasoned perfectly straight hard wood batten

varnished on four sides but not less than 10mm finished thick and the width of which is such as to suit total width of cables laid on batten. Prior to the erection, these shall be painted with one coat of varnish. The battens shall be screwed to the walls and ceiling by flat head wood screws to wood plugs or other approved plugs at an interval not exceeding 750mm. The flat head wood screws shall be counter sunk within wood batten and smoothened down with a file.
Link clips shall be conforming to IS:2412 1975 and these shall be so arranged that one single clip shall not hold more than four single core P V C insulated wire upto 2.5 sq. mm, above which a single clip shall hold two single core wire. The clips shall be fixed on varnished wood batten with brass pins spaced at intervals of 100mm in the case of horizontal runs and 150 mm in the case of vertical runs. The link clips shall be made of heavy tinned brass sheet or Aluminium sheet, the thickness being not less than 27 gauge.
Where wires pass through walls/floors these shall be protected from mechanical injury by means of rigid steel conduit. The end of the conduit shall be neatly bushed with bakelite. The conduit shall extent 1.5 mm above the floor and flush with the ceilings or walls.
After erection, the P. V. C. wiring along the batten shall be painted with one coat of synthetic enamel paint of an approved colour.

INSTALLATION AND WIRING OF DISTRIBUTION BOARD/ MCB DISTRIBUTION BOARD.
Where fixing of distribution board/ MCB DB on double teak wood board is specified only hinged type wooden board with brass hinge shall be provided and the size of the board shall be such as to match the size of the Distribution board/ MCB DB. A minimum margin of 25 mm shall be provided on all sides of the distribution board/ MCB DB. The outgoing circuit shall be taken out through a horizontal slot at the rear side of the distribution board/ MCB DB enclosure.
Where fixing of Distribution board/ MCB DB on M.S. frame is specified, the frame shall have sufficient mechanical strength to carry the weight of the DB./ MCB DB.
Where fixing of Distribution board/ MCB DB will be of con­cealed type, the chase in the wall shall be neatly made and be of ample dimensions to permit the DB to be recessed in wall and flushed with finished wall surface.
The cable / wires shall be connected to the terminal only by soldered or crimped lugs, unless the terminal is of such a form that it is possible to securely clamp them without cutting away of cable strands.
All bare conductors shall be rigidly fixed in such a manner that a clearance of at least 25 mm is maintained between conductors and material other than insulating material.
EARTHING
All non current carrying metallic part of various electrical equipments as well as cable armouring, metallic conduit, cable racks/ trays, brackets, supporting structures, etc. shall be effectively earthed by not less than two separate and distinct earth connection in accordance with Indian Electricity Rules, and the relevant Indian Code of Practice for earthing 3043 1987.
EARTH ELECTRODE
PIPE ELECTRODE
The earth electrode for earthing station shall comprise G.I. pipe 'B' Class of 50mm internal diameter and 3 Mtr long in one single piece with holes 12mm dia on all sides at 150 mm centre, upto a minimum height of 2.5 metre from bottom. Removable caps / wire mesh funnel shall be provided at the top of pipe to facilitate pouring of water. Suitable clamps made of 40mm x 6mm galvanised M.S. flats complete with bolt and nut shall be provided with the electrodes at 100 mm from the top end for connecting earth conductor. No joints will be allowed in the earth electrode. The electrode shall be driven at least 2 metre clear from masonry structure and the distance between two electrode shall be not less than 2 metre when installed in parallel and preferably placed twice the length of the electrode i.e. 6 metre. A masonry inspection pit of inside dimension 300mm x 300mm x 300mm deep (unless otherwise stated) shall be built with 125 mm thick cement mortar (6:1) brick work both inside and outside plastered with 20mm thick and neatly cemented 1.5 mm thick, inside top and outside around the top of the earth pit, so that the top of the G.I. pipe is 250 m below the finished ground level and the opening on top shall be provided with C.I. manhole ring having lockable C.I. cover fixed & flush with the outside finished ground level.
PLATE ELECTRODE
Where plate electrode for earthing is to be employed, the size of the plate shall not be less than 600 mm x 600 mm x 6.3 mm for G.I. plate in thickness and 600 mm x 600 mm x 3.15 mm thickness in case of copper plate.
The plate shall have a drilled hole 14 mm dia. at the centre. The G.I. flat of not less than 40 mm x 6 mm (1 no. 25 mm x 6 mm G.I. flat for lightning conductor installation) should be con­nected to the plate by means of a 65 mm long 12 mm dia galv. bolt, double nuts using double galv. washers. In case of copper plate, copper flat of not less than 25 mm x 6.0 mm shall be used as the earth lead. The flat shall first be fastened on one side of the plate, leaving adequate length of flat, which shall be taken over to the other side i.e. to the earth busbar, switch­board, pole, continuous earth wire for O.H. line, service brack­et, lightning arrestor or the object to be earthed and be fas­tened as per the details of IS:3043 1987. No joint on the earth lead conductor is permitted. Every care shall be taken to ensure that the ends of the wire/ flats have been securely clamped by the bolt on cleaned surface of the plate and establish a good electrical contact.
The plate shall be buried vertically at a minimum of 3.6 M below the ground level for sandy soil and 2.0 m below the ground level for normal soil. In order to place the same at the prescribed depth, the dimension of pit to be excavated shall be 900 mm x 900 mm x 4 m deep. The G.I. plate shall be placed in position by the contractor only after the inspection of excavated pit and approval is obtained from the Consultant/ Employer.
After placing the plate the earth lead conductor shall be pro­tected by means of a continuous length of G.I. pipe (Class B) having 50 mm dia (minimum) bore or route depending upon the size of the lead, right from the plate upto a height of 600 mm metre (2 ft.) above ground level. The whole length of pipe shall be filled with bituminous compound of approved make and brand. The molten compound shall be poured from the top end of the pipe and topped upto overflowing.
A masonry inspection pit for the earth station of inside dimension approx­imately 300 mm x 300 mm x 300 mm depth (unless otherwise stated) shall be built with 125 mm thick cement morter (6:1) brick work with 1st class bricks, both inside and outside plastered with 20 mm thick and neatly cemented 1.5 mm thick, inside, top and outside around the top of the earth pit. The opening on top shall be provided with C.I. manhole ring having lockable C.I. cover fixed and flush with the outside finished ground level.
Electrodes shall be buried at least 2 metre away from masonry structure/ building/ pole or object to be earthed. However, earthing electrodes for L.C. installations should be as close to the down conductors as possible. Electrodes when installed in parallel, shall not be placed less than 2 metre apart and pre­ferably placed at distance greater than 6 metres.
All the excavations shall be duly back filled, dressed and rammed.
EARTH BUSBAR
GALVANISED M.S. FLAT
Unless otherwise specified in the schedule of quantities, the earth busbars shall be of heavily galvanised M.S. Flat of cross section 50mm x 6mm having adequate number of drilled holes with 10mm galvanised steel bolts, nuts, plain and spring washers for securely connected the earth leads and the continuity of conductor. The busbar shall be fixed on wall, having clearance of 6mm from wall with spacing insulators with 13mm dia G.I. rag bolts, spaced about 50mm apart.
COPPER FLAT
To be used, as specified in the schedule of items, where earth­ing requirements are more stringent, with use of brass bolts, nuts, washers for connections.
EARTH LEAD CONDUCTOR
The earth lead for each electrode shall be 7/10 S W G stranded G.I. wire connected securely to the earth electrode and earth busbar. The earth lead shall be mechanically protected with a continuous length of 25mm dia G.I. Pipe (Class 'B') right from the electrode to the earth busbar and the pipe shall be filled with bituminous compound.
Galvanised M.S. Flat earth conductor directly buried in ground shall generally be taken at a depth of 600 mm and shall be provided with one coat of bituminized paint, one layer of half lapped bituminized tape and a final coat of bituminized paint to prevent corrosion.
The earth conductor when laid inside building/ sub station shall be taken either exposed on cable racks/ trays, walls, ceiling, etc. or embedded in concrete depending on installation. Galvanised M.S. saddles clamped to M. S. flat spacers with tapped holes shall be used for clamping earth conductor. Flats shall be supported at intervals not exceeding 500 mm and stranded wires at intervals of 300mm.
Connection of earthing leads to earth electrodes and termination of flat earth continuity conductor to equipment shall be made by means of bolting. Connection of stranded earth wire to earth bus as well as to equipment shall be made through crimping type lugs and bolting. Jointing and tapping of flat earth conductor shall be done by means of welding.
The earth resistance from any point of the earthing system shall not be more than one ohm.
WORKMANSHIP AND INSTALLATION WORK
The workmanship shall be of good commercial quality and all supply material and installation work shall be completed to the full satisfaction of the Consultant/ Engineer in Charge.

CEILING FANS AND REGULATORS
The ceiling fans and regulators shall conform to IS: 374 1979. The fans shall have totally enclosed capacitor start and run motors suitable for operation on 230/ 240 Volt, single phase, 50 Hz. A. C. system. The regulator shall have an 'ON'  'OFF' position next to the lowest speed contact and shall be provided with at least five running positions.
EXHAUST FANS
The Exhaust fans shall conform to IS:2312 1967 and suitable for operation on 230/ 240 Volt single phase. 50 Hz. A.C. system. The fans shall be ring mounted type designed to give maximum air volume changes under free air flow conditions.
SWITCHES
Light and fan switches shall be rated for 6 amp. 250 volts and of Piano-key type and suitable for flush mounting on sheet steel board with moulded bakelite cover (manufactured by switch manufacturer). The switches shall be of approved make & acceptable to the Consultant/ Engineer in Charge. The switches shall comply with relevant I.S.
SOCKET OUTLET AND PLUG
These shall be of 3 pin type and of rating 6 amps (for light) and 16 amps. (for power). Each socket outlet shall be complete with controlling switch and plug top. Protective fuse links shall be provided with 16 amps. power socket outlet. The socket outlets shall have piano key type switches of approved make and acceptable to the Consultant / Engineer in Charge. The socket outlet and plug shall comply with the relevant I.S. specifications.
SWITCH BOXES
Sheet metal (16 SWG) switch boxes/ connection boxes with 3 mm thick bakelite top cover flushed in wall by housing the box after cutting brick wall. Sheet metal boxes shall be treated against corrosion by passivation or other approved method.

TUBULAR POLE/G.I. PIPE POLES
Where tubular steel pole are specified (either swagged or stepped), the same should be manufactured and supplied as per I.S. 2713 part I to III   1980. Where G.I. pipe pole are speci­fied the same should be approved to I.S.
LOOP IN JUNCTION BOX
The junction boxes shall be drip proof type dust and verminproof construction fabricated from 2mm thick sheet steel having internal dimensions of 200 x 150 x 130mm depth for single phase distribution system and 250 x 200 x 130 mm depth for three phase distribution system. These shall have moulded bakelite base connector block with anti vibration nickel plated brass terminals of suitable size and rating and porcelain fuse fittings.
MANUFACTURER'S DRAWING
The successful tenderer shall submit for approval General arrangement and dimensioned drawings for Power and Lighting distribution switch board, Motor Control centre, Bus duct arrangement, Miniature circuit breaker distribution board, Distribution board, Interlocked Switch socket outlets, Clock switch control panel, T P Power Cable junction box and cable rack etc. as required in three sets before commencing manufacture.

WORKMANSHIP AND INSTALLATION WORK
The workmanship shall be of good commercial quality and all supply materials and installation work shall be completed to the full satisfaction of the Consultant/ Engineer in Charge.
CONTRACTORS RATE TO INCLUDE
Apart from other factors mentioned elsewhere in this contract, the rates for the above shall include for the following :
i: All labour, materials, tools and construction equipment required for fabricating and fixing of above stated items.

ii: Scaffolding including erection and removal.

iii: Making good of all damaged civil work, if any.

iv: Necessary modification of pre laid conduit including supply & fixing of Metal/ PVC conduits and accessories, chase cutting, etc. as required to complete the work.

CODES & STANDARDS.
All the systems and equipments within the scope of this tender shall be of reputed proven makes, designed and manufactured in accordance with the stipulations of latest versions of Indian Codes or recommendations of W.B.F.S / T.A.C. / F.O.C. / N.F.P.A.

When an equipment is offered conforming to standards other than those listed below, it shall be clearly brought in Schedule of Deviation.

01. IS:1646 : Code of practice for fire safety of building (general), Electrical Installations.

02. IS:1648 : Code of Practice for fire safety of buildings (general), Fire Fighting Equipment and its Maintenance.

03. IS:3034 : Code of Practice for Fire of Industrial Buildings, Electrical Generating and Distributing Stations.

04. IS:884 : First Aid Hose Reel for Fire Fighting ( For Fixed Installations).

07. IS:1239 : Part - I : Mild Steel Tubes (upto 150mm).

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