GALVANIZED IRON PIPES AND G.I. EARTHING:G.I. EARTHING: Earthing of Sheet metal/ iron clad Switches and metallic cases etc., with No. 8 S.W.G. (4mm dia.) G.I. wire in 15mm dia G.I. pipe partly recessed and partly on surface complete with 135cm long 50mm dia. G.I. earth pipe with G.I. reducing socket (50mm x 15mm) including erection of the same, 10 metre below ground level with necessary charcoal & salt mixture etc., up to 13 metre in length (including boring & refilling).