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Thanks guys. Not sure if anyone would understand the way I described the problem. Very usefull info. Would seem that my system is within IEE tolerances for TT system, with a well functioning earth rod with resistance in the region of 100-200 Ohms. Thanks again.

I have an old house, recently fully re-wired (previous owner, registered electrician). I have live and neutral in, and earth by ground rod. Appears to be TT type system. After installing new shower room, (fully bonded earth). I was checking earths and noticed a potential difference between...