PROVN OF EARTHING PITS TO VARIOUS BLDGS IN TECH AREA AT AFS YELAHANKA.

Amount

M&L for earthing complete with galvanised steel earth plate electrode 600 x 600 x 6mm thick burried directly in ground earth pit not less than 2.25 M deep below ground level with top edge of the plate not less than 1.5 M below normal ground level connected to galvanised strip of 25x4 mm by means of nuts, bolts, checknuts, washers of galvanised iron or steel all as shown in electrical plate No. 3 of SSR Part I of 2009 connected to and including earthing test point or disconnecting / testing link including excavation/ earth work in any strata, removal of surplus earth, GI pipe for watering and funnel, GI Pipe medium grade 40mm dia for earth lead protection, PCC 1:3:6 type C1 chamber with chamber cover in RCC 1:2:4 type B1 all as specified and directed by Engr-in-charge.

M&L earthing complete with GI earth plate electrode 600mmx600mmx6mm thick buried in ground vertically to a depth not less than 2.25 mtrs below ground level with top edge of earth plate not less than 1.5 mtrs below ground level connected with GI earth wire of 4 mm dia up to a length of 7.5 mtr long by means of GI bolts, nuts,washers etc and protected by GI pipe light grade 40mm bore and 20 mm dia GI tubing light grade with funnel for watering, connecting to test point, all as shown in electrical plate No.3 of SSR Part I incl necessary earth work and excavation in any type of soil, PCC(1:3:6) type C1 earth chamber with RCC cover slab 50 mm thick,with RCC (1:2:4) type B1 with 8 mm CTD bars re -inforcement both ways at 140 mm C/C with MS hook,including salt, charcoal and provn of test point complete all as spcified and directed by Engr-in-Charge,

Material and Labour for earthing complete of "Jef Ecosafe" comprising of 17.2 mm dia 3 mtr long Earth electrode of low carbon steel electriode with 250 micron copper bonding, 50 pounds of Ecosafe based environment friendly backfill and suitable clamp, back-fill earthing enhancing compound shoould strictly be a Eco Safe carbon based conductive concrete type which has a resistivity of less than 0.12 Ohm mtr as per Clause 14.5D of IEEE : 80 standard. Back-fill compound should be electronically conductive (like in metals) and should not depend on moisture for conduction. Back-fill compound should be environment friendly, should solidify when mixed water and set like concrete and should not leach /diffuse into the ground. Back-fill compound shal not mixed with any soil while pouring in the bore hole. Test Certificate as per IEC :62561-7 for Back-fill compound shall be submitted laongwith the material. 17.2 OD SS clamp both side, Eco friendly rust proof heavy duty weather proof Polythylene Earth pit chamber with following dimensions : 254 mm dia (top),330 mm dia (bottom) & 260 mm (height). Make : JEF type R16CB01SS02E06 or its techno-commercially equivalent.

Supply and Installation of 10 mm copper bonded Round steel solid Conductor for ring earthing meet the requirements of IS/IEC 62305 and IEC 6256-2, Type B earthing has been proposed for complete buildings. Make : JEF Type J1DC05 or its techno-commercially equivalent.

Supply and fix copper strip 20mm x 3 mm complete with saddles and fixing screws etc for roof conductors and down conductors above ground level complete all as specified and directed.

RAMESH BABU CO

SREE VARU ELECTRICALS

MATA GUJRI CONSTRUCTION CO.