PPSP/e-Ten/124/E/22-23/NIT-04 Dated 21.02.2023

Amount

Earthing System Complete

Supply and Laying of Earth strip with Galvanized Iron 50 x 10 mm Flat (Make :- Sail/RINL/Jindal) including cold bending to shape as require after removing of gravel and excavation of soil upto 0.6 MTR below the Ground Level and back filling. (Running welding of GI strip should be minimum 200 mm lapping. Electrode for welding should be approved by the Supervisory Officer of WBSEDCL).

Supply and drawl of earth riser with Galvanized Iron 50 x 10 mm Flat (Make :- Sail/RINL/Jindal) by welding (Running welding of GI strip should be minimum 200 mm lapping. Electrode for welding should be approved by the Supervisory Officer of WBSEDCL) for earthing of sub-station structures & equipments as per direction of the Supervisory Officer of WBSEDCL. (by excavation of soil or without excavation of soil as per requirements)

Construction of inspection pit 300 X 300 X 300 mm size (inside) with 250 mm thick brick work in cement mortar (1:4) 12 mm thick cement plaster in the inner and outer surface along with supply of materials. Pit shall be covered with precast R.C.C slab 75 mm thick rainforced with 10 mm dia M.S rod @ 100 mm center-to-center both ways including lifting lugs of 10 mm dia M.S rod at middle. ( For Treated pit)

Doing connecting of earth riser with structures & all equipments of sub-station as per requirements and direction of the Supervisory Officer of WBSEDCL along with supply of all material.

Supply and drawl of earth strip by 50 X 10 mm Galvanized Iron flat fixed on the side wall of cable trenches providing saddle with Galvanized Iron nuts & bolts from existing earth mat to control room (Running welding of GI strip should be minimum 200 mm lapping. Electrode for welding should be approved by the Supervisory Officer of WBSEDCL)

Painting of joining portion of earth strip by bituminous paint after scrapping & smoothing of surface.