Ze on campsite

tombennetts · Jun 6, 2011

Hi all.
Currently working on a campsite installing new hook up points. Just had a new 3 phase supply installed. Each phase feeds a separate consumer unit which in turn feeds 4double hook up points each. The supply is tncs up to the hook ups (protecting the swa) and tt at the hook ups. The ze at the hook ups varies from 240 ohms to 790 on one earth rod. Anyone got any good ideas on lowering the ze, as at the moment the rcd's aren't operating due to the high earth path I'm assuming!
Thanks
Tom

nickblake · Jun 7, 2011

tombennetts said:
sorted out today, down to 70 ohms. cheers guys

well you cant just say that lol ........how did you do it then mate , id be happy with 70 ohms

telectrix · Jun 7, 2011

i'll make a guess at 8 pints of stella pee'd on the ground by the rod/s

nickblake · Jun 7, 2011

telectrix said:
i'll make a guess at 8 pints of stella pee'd on the ground by the rod/s

Naa bet he drinks carling black lable

tombennetts · Jun 7, 2011

took the out all the way back to the single phase consumer unit, didnt take it inside. Put a rod in by each unit, which also was linked through the armoured to the rods at each hook up point on that row, meaning in effect each hook up has 5 earth rods. I think it works out the same calculation as resistors in parallel, did do a quick sum after and results came out pretty similar. Didn't have to resort to peeing on it or sticking it in the showers!