bids are invited for copper plate earthing system material for construction of earthing pits , copper plate , copper strip , salt , charcoal , pvc pipe , material for construction of concrete box with lid , brazing of interconnection , pulse measuring device , 10 sq mm multi- strand insulated copper wire , equipotential earth bus bar with covered box , material for construction of inspection chamber , sitc of all above items , self latching cable tray with cover , bamboo disposal ladder , self-supporting heavy-duty folding aluminum ladder , self-supporting folding aluminum ladder , pvc pipe , heavy duty pvc pipe plastic flexible corrugated hose , extension board , cotton gloves , helmet total quantity : 45431