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Posted By Topic: 4mm main earth

zztexaszz
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.
   

AlecK
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
   

zztexaszz
Apr 23 2018 19:47

Thanks Alec.