In plate earthing chamber should be made whose depth should be app. 2.5 to 3 mtr and diameter should be app. 600 mm(as per plate size). Then insert a GI plate as per required size app. 600x600x3 to 5 and two GI strip should be attached vertically with this plate which should be properly bolted. Among these strips fixed a GI pipe would be fixed whose diameter approx 2.5 placed centrally for filling water. Then fill salt, coal and soil in this chamber.