Repair to building earthing lightning arrestors at AF Stn Singarsi under AGE I AF Singarsi

Amount

M&L for earthing complete with copper earth plate electrode 600x600x3.15 mm thick burried directly in ground ( earth pit not less than 2.25 mtrs deep below nominal ground level) with top edge of the plate not less than 1.5 mtrs below nominal ground level connected to copper strip 32x6 mm by means of proper bracing , check nuts and washers of copper all as shown in electrical plate No 5 connected to earthing test point and testing on completion, all as specified and as directed. Note:- the cost of excavation and earth work PCC pit and cover, funnel & watering pipe, wiremesh,charcoal dust and common salt and earth strip up to 7.5 mtrs long shall be deemed included in the unit rate for earthing.

M&L for Earthing complete with pipe in pipe technology concept involves two mild steel pipe one small dia pipe (41.9mm) is inserted in a large dia pipe (76.2mm).The fitted pipes are subjected to Zinc coating /copper plate /alloy coating /Hot dip galvanization ,80-100 micron on the inner/outer Electrode 3 mtr long .The space inside the Conductolite are filled with a specially developed high conductive and anti corrosive mixture called crystaline conductive compound . The out side of the outer pipe should be filled with BFC (back filling compound)including connecting the main earth lead to the earth pipe by means of nut & bolts with washer etc. The job includes digging of bore size 10'' by 11 feet depth for installing and including provision of FRP Earth pit cover (250x250x2mm) for protection and safe guard of terminals all as per model No :ASEEL-39 make Eltek Infra Solution kolkata or equivalent.

M&L Earthing complete with Galvanised steel earth plate electrode of size 60cmx60cmx3.15mm thick ,burried direct the ground (earth pit not less than 2.25 mtrs deep below ground level )with top edge of the plate not less than 1.5 mtrs below normal ground level ,connected to GI Earth strip 32x6 mm as earth lead by means of bolts nuts,check nuts and washer of galvanised iron steel protected by 40mm bore (light grade ) both up to 7.5 m all directed including cement concrete (1:3:6) type C1 earth pit with precast RCC (1:1.5:3) type A1 cover slab of size 42x42x10 cmn thick reinforced with 8mm dia TMT bars @15 cm c/c both ways with 10 mm miled steel round bar of 30 cm long ,bent to shape as lifting handle ,funnel ,wire mesh,20 mm bore GI pipe (LG) for watering including charcoal or coke and salt in alternate layers with necessary earth work in soft/loose soil ,test point complete all as shown in electrical plate No 3 of SSR Part 1 including testing complete all as specified and directed by Engr-in-charge.

M&L 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 32 x 6 mm GI strip. Note:- All the joints shall be made with welding to get proper conductivity.

Supply and fixing Air termination single pointed, copper rod 12mm dia and 300mm long fixed on Galvanised iron pipes with copper/aluminium/GI strip for earth conductivity to ground complete all as directed by Engineer-in-Charge.

Supply and fixing test point terminal block made of gun metal or phosphorous bronze size 75mm x 75mm x 25mm, drilled and screwed including 3 Nos, 8mm dia and 25mm long hex head screw complete all as directed by Engineer-in-Charge

Supply and fixing Copper strip 20mm x 3.15mm with saddles at even intervals and fixing screws etc. for roof conductors and down conductors above ground through bracing complete all as directed by Engineer-in-Charge.

Supply and fixing GI tubing 40mm bore (light grade) in trenches/floor/fixed along pole for cable/earth strip protection with proper size of clamp, nuts and bolts or for fixing lightening conductors etc all as specified and as directed by Engineer-in-Charge.

Material and labour for PCC (1:2:4) type B-2 using 20 mm graded crushed stone aggregate as in coping of poles / pipes / strip alignment pit chamber and cover etc using necessary formwork and finishing the exposed surfaces even and smooth without using extra cement, as directed by the Engineer-in-Charge.

M/S Subhadip Enterprise

M/S AMARNATH AGARWALLA

M/S KUMAR AVINASH

M/S SINGH ENTERPRISE

LALAN SHARMA

M/S ASHA ENTERPRISE