SHEET METAL IRON CLAD CHANGEOVER SWITCHES: Supply and erection of sheet metal iron clad change–over switch on existing surface with G.I. bolts & nuts / rag bolts and nuts etc., according to the size of holes in the body of the switch including connectiions with suitable size of thimbles and bonding to the existing earth as per PWD General Specifications 2010. Sheet metal iron clad four pole changeover switch 32amp. 415 volts