bids are invited for construction of earth pits - earth pit of the size of 1-meter diameter and 3-meter depth shall be excavated, after depth of 3 meter the size of excavation shall be 900x300x900mm depth. all material required for construction will be supplied by the vendor. , construction of earthing inspection chamber with lid - 300x300x300 mm (inside dimension) concrete box with smooth cement plaster finish shall be provided on the top of the pit. a lid painted black approx. 50 mm thick with pulling hooks, shall be provided to cover the earth pit. all material required for construction will be supplied by the vendor. , copper plate - 600mm x 600mm x 3.15mm (thickness) (copper purity not less than 90%, nabl approved lab test report to be submitted) , copper strip - supply and laying of copper strip (copper purity not less than 90%, nabl approved lab test report to be submitted) of size 25mm(width) x 3mm (thickness) on floor/wall/trenches with suitable spacer and saddle (brass) and termination of copper strip shall be carried out with brass bolts and nuts etc as per specifications. all accessories for laying to be provided by vendor. , conventional lightning arrestor - conventional la with solid copper rod (1-inch diameter x 2 meters length) with minimum 04 nos. of solid copper fins and ss accessories for mounting on frp poles. (copper purity not less than 90%, nabl approved lab test report to be submitted) , pvc insulated multi strand copper cable for la - 70 sq mm (copper purity not less than 90%, nabl approved lab test report to be submitted) , brazing of interconnection - brazing of all interconnections and joints of copper strips and copper cables of earthing systems and lightning arrestors as per site requirement , equipotential earth bar copper - equipotential earth bar (eeb) with pre-drilled holes of suitable size for termination of bonding conductors. , frp poles - 6 meter frangible fiber-reinforced plastic (frp) poles with gi base plate for installation