Online assistance for electrical trade people in New Zealand and Australia Login  |  Register  |   Forgot Password
Assistance for electrical trade people




Click here to send Ron a pdf document for publication on this Topic

Documents must be less than 200k in pdf format

Posted By Topic: 4mm main earth

Apr 23 2018 17:42

I went to a 1980\'s house today and it had a 4mm main earth.I\'m not sure whether to leave it as is or replace it. I can\'t remember it ever being ok though.

Apr 23 2018 19:07

Some old installations had (probably some still have) equivalent of 2.5 mm@ bare as MEC.
ESR 113 and its predecessors rule: for most cases, no requirement to upgrade

Apr 23 2018 19:47

Thanks Alec.