NISER/IWD-ELECT/SMS/24-25/14

Supply Installation Testing and commissioning of Maintenance free Chemical Earthing Electrode -The Electrode will be a solid steel rod (Copper Cladded Earth Electrode) of 19mm 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 diamention 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:- The Earth enhancenment material, Bentonite powder (backfill material ) should be High conductive Non corrosive Reduce soil resistivity Retain moisture for a long time bentonite powder or must have cmpostion of Carbon, silica,chloride, calcium, tin, Mg, Lead, PBB, PBDE etc.as per the ISO standard,IEC 62561-7 and ISO certified by Govt. of India (Quantity : 75KG or as required for the pit). The chamber cover & frame shall be hinged type & it shall be got approved by EIC.The value of earth resistance and date of measurement shoud be written on the chamber cover with paint.

Supplying and laying 50 mm X 5 mm G.I strip at 0.50 metre below ground with excavation and refilling, as strip earth electrode and 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)