NISER/IWD-ELECT/SCS/25-26/04

Supply Installation Testing and commissioning of Maintenance free Chemical Earthing Electrode -The Electrode will be a solid steel rod (Copper Cladded Earth Electrode) of 17mm Dia and min 3 mtr length. The thickness of the copper coating will be 250 microns and uniform with tolerance level of 0.1-micron Earth electrode with brand name engraved on each electrode. Earth electrodes will be visually inspected and checked for dimension and length before installation. Electrodes should not get physically crack or depleted in case of bending. (Including excavation and filling of material with the back field compound/Bentonite powder etc.) The electrode to be used to be tested and approved by CPRI Back fill Compound (Bentonite Powder):- The Earth enhancement material (backfill material ) should be High conductive Non corrosive Reduce soil resistivity Retain moisture for a long time bentonite powder or must have composition of Carbon, silica, chloride, calcium, tin, Mg, Lead, PBB, PBDE etc.as per the ISO standardise 62561-7 and ISO certified by Govt. of India (Quantity : 75KG or as required for each pit). The chamber should be made of brick with cover & frame which shall be hinged type & it shall be got approved by EIC. The value of earth resistance and date of measurement should be written on the chamber cover with paint.

Supplying and Laying of one number PVC insulated and PVC sheathed / XLPE power cable of 1.1 KV grade of following size direct in ground including excavation and refilling the trench etc as required, but excluding sand cushioning and protective covering. 4Cx16 Sqmm Aluminium Armoured cable for earthing

Supplying and making end termination with brass compression gland and aluminium lugs for following size of PVC insulated and PVC sheathed / XLPE aluminium conductor cable of 1.1 KV grade as required.4Cx16 SQmm Cable

Supplying and laying 25 mm X 5 mm G.I strip at 0.50 metrebelow ground or on the surface with GI strip saddle, as strip earth electrode, including connection/terminating with G.I. nut, bolt, spring, washer etc. as required. (Jointing shall be done by overlapping and with 2 sets of G.I. nut bolt & spring washer spaced at 50mm)

Providing and fixing earth bus of 50 mm X 5 mm copper strip on surface along with Insulator and PVC sleeve (2 sets) for connections etc. as required for UPS and Insrtument Earthing.