QUESTION

QUESTION of the Month***** In conduit wiring, the ratings of the wires are higher than that of surface wiring for example lighting points for conduit is 1.5mm while surface is 1.0mm, 13amps Socket outlet is rated at 2.5mm while surface is 1.5mm. My question is what is the reason for this difference since both serves the same purpose....... Please technicalize your answer to prove you are passionate Electrical Engineer or technologist.