PROVISION OF CHEMICAL EARTH PIT AT VARIOUS LOCATION AT AFS DINJAN UNDER GE (AF) MOHANBARI.

Amount

Material and labour for Earthing complete with copper earth plate electrode 600 mm x 600 mm x 3.15mm thick buried directly in ground (earth pit not less than 2.25 m deep below the normal ground level) with top edge of plate not less than 1.5m below normal ground level connected to copper earth lead strip of size 20 mm x 3 mm thick by means of brazing, bolts, nut, check nuts and washers made out of brass and connected to main switch board or main control board all as shown in electrical plate No 3 of SSR part 1 including three coats of white wash on plastered/PCC surface (Exposed surface) and pit number to be marked on a GI plate above 45 cm from GL as per color code followed in AF station including testing. complete all as specified and directed by Engineer-in-charge. Notes:- 1) The unit rate also including for excavation, earth work in any type of strata, PCC 1:3:6 mix, Type C1 pit, pre cast cover RCC (1:2:4) type B-1 cover slab of size 300 mm x 300 mm x 100 mm with 8 mm dia TMT bar @150 center to center both ways with one handle for lifting made out of 8mm dia mild steel bar 20 mm bore galvanised iron pipe 'medium grade' for watering, funnel, wire mesh and charcoal or coke of alternative layers of 15 cm and 40 mm bore galvanised iron pipe "light grade" for protection of earth lead connection. 2) If the desired earth resistance is not found, earthing shall be redone by the contractor at no extra cost to the department.

Material and labour for free Chemical earthing system complete with 02 (two) nos. copper rods, internal rod of 19 mm dia and external rod is hollow and having internal dia. 48 mm and each rod of length 3000 mm electrode buired at suitable distance apart directly in ground, to bore holes of 120 mm dia vertically to a depth not less than 3.6 m deep below ground level with top edge of earth electrode at a depth not less than 100 mm below normal ground level, including back filling of bore holes with advanced earth enhancing compound for artificial treatment to soil so as to achieve earth resistance below 01 ohms as specified in para 19.140 of SSR Part-I (2009) including three coats of white wash on plastered/PCC surface (Exposed surface), one coat of synthetic enamel paint of approved color on pit cover and pit number to be marked on a GI plate above 45 cm from GL as per color code followed in AF station including testing. complete all as specified and directed by Engineer-in-charge. Note : 1) The unit rate also including for excavation, earth work in any type of strata, PCC 1:3:6 mix, Type C1 pit, GI earth pit cover and GI plate for earth pit cover. 4) If the desired earth resistance is not achive during testing as per IS, the complete earthing shall be carried out by the contractor at his own cost and no extra claim shall be admissable.

Supply and fixing for earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required for 20 mm x 3 mm thick, copper strip using porcelain clit/post insulators, complete all as specified and directed by Engineer-in-charge.

M/S A K BROTHERS

ANZ CORPORATION