103) As per IE rules, the voltage at the point of commencement of supply in the case of high or extra high voltage, shall not vary more than :

104) The type of conduit used for wiring is :

105) The metal conduits can be protected against corrosion by :

106) The non metallic conduit pipe used in wiring, should have a minimum size in diameter is :

107) The wall thickness of heavy gauge 20 mm size of conduit is :