NIC tech manual shows that if you supply out building the earth you provide has to be main bonding conductor and CPC combined
the calc i did above does give the equivalent steel CSA to copper, right ?
a cable manufacturer said that you have to multiply the required csa of copper by 7.5 .... which sounds quite strange to me, surely steel isnt 7 times less conductive ? 10mm copper would mean you need 75mm steel
the calc i did above does give the equivalent steel CSA to copper, right ?
a cable manufacturer said that you have to multiply the required csa of copper by 7.5 .... which sounds quite strange to me, surely steel isnt 7 times less conductive ? 10mm copper would mean you need 75mm steel