bids are invited for copper plate - at least 600mm x 600mm x3.15mm thickness. purity not less than 90 percent. note that each copper plate shall be brazed with a copper strip of 15 feet length x 25mm width x 3 mm thickness. purity of the material shall not be less than 90 percent. the copper plates shall be connected to copper strip by riveting and brazing at no less than two points and the joints shall be protected by heavy coat of bitumen , copper strip - at least 25mm x 3 mm thickness. purity not less than 90 percent , copper wire non stranded - at least 4 mm diameter and purity not less than 90 percent , copper rod - 1 inch diameter x 5 feet and purity not less than 90 percent. 2 inch thread one side and other side cone shape , insulated copper wire - pvc insulated copper cable of 70 sqmm cross section and purity not less than 90 percent and pvc color as green , gi pipe with socket and reducer 2 inch to 1 inch - 2 inch x 30 feet. not less than 3 mm thickness , gi pipe with suitable gi base plate to mount 4 inch gi pipe - 4 inch x 10 feet , perforated gi earthing pipe - 40 mm dia and 10 feet length. not less than 3 mm thickness , pvc pipe - 2 inch x 20 feet and uv resistant , heavy duty pvc pipe plastic corrugated hose - 4 inch diameter , salt - granular and about 1 to 3 cm granules , charcoal - granular and about 1 to 3 cm granules , raceway with l and t junction - at least 6 inches x 10 feet x 18 gauge and not less than 12 swg , perforated cable tray with l and t junction - at least 6 inches x 10 feet x 18 gauge and not less than 12 swg , extension board - 4 x 5 or 15 amp with individual switch with 30 meters using 3 x 1.5 sq mm copper conductor armoured pvc sheathed , self supporting heavy duty folding aluminium ladder - 2 cross leg minimum 20 feet , self supporting heavy duty folding aluminium ladder - 2 cross leg minimum 07 feet , heavy duty pvc pipe plastic corrugated hose - 2 inch diameter , 3 core electrical cable - 3 x 2.5 sq mm multi strand copper condu