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tnc-s from dno supply for domestic equipment. heaters are wired in singles in trunking, ill have another look tomorrow and get back with any findings

i know its in a 25kv sub station really old.

the means of isolation is by a live and neutral seperate fuses at each heater

hi i am in the middle of testing a installation. its tn-c-s when i drop the neutral link at the main incomer isolator i still get a dead short on earth to neutral at the dist/board. I have disconnected all neutrals and there are three neutrals going dead short to earth. I cant find where the...