Discuss Ze & Zs-- unacceptable readings in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
I know what comes next. the guy is niceic so will say a TT system has to be under 100ohms. brb says 200. already feel like telling him to go forth!
Why do you want to do that? Sounds like he does his job properly and if everyone did you wouldnt have that mess there.
As far as I am aware my mate whos in the NIC says they work to 200 ohms and has no idea where you got 100 from.
You need to complete and eic and state the change to TT on that particular sub circuit only unless youve changed others. You will need to record the method of measurement, measured resistance ( with rod disconected from met if using method 2) type of electrode and location. 178 is still pretty high though if it was me I would try a longer rod or different position to try and get it down. If its too high there may not be enough prospective current to trip breakers. It sounds like youve got a bit on there sorting that mess out. Have fun!!
OH dont forget your supply characteristics will have to be recorded seperately because I presume that isnt TT.
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