Prasar Bharati - Tamil Nadu
12755125 tender for excavation of soil to form earth pit of size 1 m x im x 3m ( depth ) , supply of maternal such as 600mm x 600mm x 3mm copper plate ( pure electrolytic 99, 9perc. ) . 25mm x 3mm copper strip ( pure electrolytic 99.9perc. ) of required length as per site conditions ( approximately 30 feet length ) and gi pipe 40mm dla, 10 feet ( class b ) continuos brazing of copper plate wth gi pipe ( 150 mm ) and copper strip ( 600mm ) providing holes of 12mm dla. along the length of the gi pipe in zig zag manner in 15 cm spacing from bottom of the pipe to2 mit. height copper strip 25x3mm should be clamped with the help of 16 swg gl wire in a regular interval of 600 nvn. filling of earth pit with alternate layers of charcoal and salt up to 5 feet from the bottom ( salt s. charcoal 120 kg each ) . 7. rest of the pit filled with river sand, 8. construction of earth pit carrier with removable cover ( to be supplied by the contractor ) the earth resistance should be measured and it should be less than lohrn....