conntext :"(i)	All rigid conduit pipes shall be of steel and be ISI marked. The wall thick- ness shall be not less than 1.6 mm (16 SWG) for conduits upto 32 mm dia and not less than 2 mm (14 SWG) for conduits above 32 mm dia. These shall be solid drawn or reamed by welding, and finished with galvanized or stove enameled surface" , question :"what should be thickness of conduit?"