bids are invited for copper plate - 600mm x 600mmx 3.15mm (thickness) (copper purity not less less than 90 percent) , copper strip - at least25mm(width)x3mm (thickness) (copper purity not less less than 90percent) , brazing of interconnection - brazing of all interconnection and joints of copper strips copper cables of cns earthing systems and lightening arrestors , pvc pipe for earth pits - 40mm dia, 3 meter length ,5mm thickness , common salt - about 1-3cm granules , charcol - about 1-3cm granules , material for construction of inspection chamber - a 600x600x600mm (inside dimension) concrete box with smooth cement plaster finish shall be provided on top of the pit. a lid, mild steel earth pit cover painted black with pulling hooks shall be provided to cover the earth pit. , installation work of earthing pit , soil treatment - incase of rocky soil upon excavation, surrounding soil is to be replaced with black cotton soil. , spd 3 phase type 2 - supply and installation of 3 phase type 2 spd as per specifications mentioned in scope of works document. , spd 1 phase type 3 - supply and installation of 1phase type 3 spd as per specifications mentioned in scope of works document. , spd 3phase type 3 - supply and installation of 3 phase type 3 spd as per specifications mentioned in scope of works document. , spd 1 phase type 2 - supply and installation of 1phase type 2 spd as per specifications mentioned in scope of works document. total quantity : 1906