PROVISION OF CHEMICAL EARTHING PITS AT COMMUNICATION BUILDING AT TPS AF STN CHIMNEY HILLS

Amount

M&L Chemical Earthing with copper Earth plate 900x600x5 mm buried directly in ground (earth pit not less than 3.50 mtr deep below ground level) with top edge of the plate not less than 2.6 mtr below normal ground level, connected to copper earth lead strip of size 32 x 6 mm by means of bolts, nuts , check nuts and washers of tinned copper / brass in addition to brazing of all joints including excavation and eatth work, GI pipe light grade 40 mm bore for protection to earth lead including charcoal dust 200 Kg, common salt 200 Kg and Megnisium Sulphate 150 Kg , PCC 1:2:4 type B1 used 20 mm graded stone aggregate in chamber and mild steel angle Iron frame 40 mm x 40 mm x 3 mm and 40 mm thick RCC 1:2:4 type B1 using 20 mm graded stone aggregate as in cover slab reinforced with 8 mm dia TMT bar both ways at 100 mm C/C GI funnel and wire mesh 25 mm bore GI pipe light grade for waterning including necessary earth work and testing complete. NOTE: (I) Earth plate shall be laid in vertical plane such a way that shorted side remains vertical. (ii) Earth plate shall have minium cover of 300 mm thick of charcoal / salt on all sides including top and bottom. (iii) Charcoal and salt shall be laid in alternate layer of 150 mm each with total eight layers (each 4 layer of charcoal and salt). (iv) the earth test point of Gun metal / phosphorus bronze shall be located.

SREE VINAYAKA ENTERPRISES (BID ID -3123809)