earthing of substation --excavation of earth pit of dia 650 mm & depth 3000 mm, installation of earthing pipe of 40 mm nominal bore & 4mm wall thickness & length 2.5 mtr long as per is 1239.gi strip for neutral earthing of size 25 mm x 3 mm for connection of transformer body,g.o set & lightening arrestor as per is 2629/85, gi nuts & bolts,refilled with earth enhancement materials and earth chamber made of brick masonary with rcc slab cover.
