Nuclear Fuel Complex Tender

EARTHING SYSTEM: MAINTENANCE FREE EARTHING SYSTEM : Supply, Installation, Testing & Commissioning of maintenance free earthing system & associated works, etc. complete as per specifications & instructions of E-I-C. A. Providing an earth station using 25 mm dia 3M long earthing electrode of high tensile low carbon steel rod molecularly bonded 250 micron copper coating on the outer surface suitable for 35kA Irms for 1 sec, filling the bore with suitable environment friendly earth enhancement compound as per manufacturer's standard surrounding the earth electrode complete with all required materials & as per the instructions of EIC. All the components shall comply to IEC-62561, IS 3043, IS 2309 as applicable. Note: The scope includes :- 1) Installation of earth rods including making pit/ drilling suitable size bore holes in normal soil/ hard rock as per manufacturer's recommendations & design. Bore hole shall be made using machine only. 2) Interconnection of earth electrodes along with required SS double sided universal clamps with GI strip. 50 x 6 mm & 150 mm long GI equipotential bar also shall be mounted inside chamber as per instructions of EIC. B. Providing & making concrete chamber (1:2:4) of size 600 x 600 x 600 mm (inside dimension) with 10 mm thick MS hinged cover mounted on 40 x 40 x 5 mm thick angle iron frame, 50 x 6 mm & 150 mm long GI equipotential bar mounted inside chamber as per instructions of EIC. Note: The Earth pit marker of 250mmX200mmX4mm MS sheet shall be welded to an 25mmX25mmX3mm angle of 300mm long shall be fixed on a concrete block. The marker shall be painted with black paint base and values written in yellow paint. Make of earth pits: DEHN/OBO/ERICO/JEF (Suitable test certificates from accredited labs to be submitted for approval)

Supply, installation, testing & commissioning 50 x 6 mm GI strip of grade 350 as per IS 277, hot dip galvanised as per IS 2629, for interconnecting earth pits and lightning down conductors. The strip shall be laid underground with jointing by welding and G.I machine screws or in ground at 750mm below, The interconnection of earth strip shall be with welded joints. GI nut bolts & washers to be used at test joints. The joints shall be painted with two coats of black bituminous compound for earth strip in ground etc. Suitable test certificate shall be submitted for galvanisation of GI strip as per applicable IS from accredited labs. Note: Rate shall be excluding excavation.

Supply