SCOPE OF WORK (ELECTRICAL) - CIDCO Maharashtra Ltd.

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CIDCO OF MAHARASHTRA LTD C.A.No.03/CIDCO/EE(Elect)/2011-12 Sr. Page No. filed to avoid interference with structures, piping or air-conditioning duct and minor adjustments shall be done to suit the filed conditions wherever deemed necessary without any extra cost. 4.2 High voltage, medium voltage and other control and communication cables shall be separated from each other by adequate spacing or running through independent pipes, trenches or cable trays, as applicable. 4.3 All cable routes shall be carefully measured and cables cut to the required lengths, leaving sufficient lengths for the final connection of the cable to the terminal of the equipment. The various cable lengths cut form the cable reels shall be carefully selected to prevent undue wastage of cables. The quantity indicated in the cable schedule is only approximate. The contractor shall ascertain the exact requirement of cable for a particular feeder by measuring at site and avoiding interference with structure, foundation, pipelines or any other works. 4.4 Cables as far as possible shall be laid in complete, uncut lengths from one termination to the other. 4.5 Cables shall be neatly arranged in the trenches/trays in such manner so that criss-crossing is avoided and final take off to the motor/switchgear is facilitated. Arrangement of cables within the trench/trays shall be the responsibility of the contractor. 4.6 All cables will be identified close to their termination point by cable numbers as per cable schedule. Cable numbers will be punched on aluminium straps (2 mm thick) securely fastened to the cable and srapped around it. Alternatively cable tags shall be circular in construction to which cable numbers can be conveniently punched. Each underground cable shall be provided with identify tags of lead securely fastened every
CIDCO OF MAHARASHTRA LTD C.A.No.03/CIDCO/EE(Elect)/2011-12 Sr. Page No. 30 m of its underground length with atleast one tag at each end before the cable enters the ground. In unpaved areas, cable trenches shall be identified by means of markers as per standard drawing. These posts shall be placed at location of changers in the direction of cables and at intervals of not more than 30 m and at cable joint locations. 4.7 All temporary ends of cables must be protected against dirt and moisture to prevent damage to the insulation. For this purpose, ends of all PVC insulated cables shall be taped with an approved PVC or rubber insulating tape. Use of friction type or other fabric type tape is not permitted. Lead sheathed cables shall be plumbed with lead olloy. 4.8 RCC cable trenches with insert plates shall be provided by the contractor. Cable shall be laid in 3 to 4 tiers in these trenches. 4.9 Directly buried cables shall be laid underground in excavated cable trenches where specified and layout drawings. Trenches shall be of minimum 0.9 mtr. depth and suitable width for accommodation of all cables correctly spaced and arranged with a view of heat dissipation and economy of design. Depth of burying shall allow minimum 900 mm soil cover for low voltage and 1000 mm for 11KV cables. L.T. cables shall be laid in trenches as above stated depth. Before cables are placed, the trenches bottom shall be filled with layer of sand. This sand shall be leveled and the cables laid over it. The cables shall be covered with 150 mm of sand on top of the largest diameter cable and sand shall be lightly pressed. A protective covering of 75 mm thick second class red bricks shall then be laid flat. The remainder of the trench shall then be back-filled with soil, rammed and leveled.
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SCOPE OF WORK (ELECTRICAL) - CIDCO Maharashtra Ltd.

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