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Thanks, will test the rods or mat, and see what I discover.

I have looked for the earth rods but cannot find them. I did not have my earth loop tester with me this morning so could not test this. I did notice that there was a 4v difference between L-N reading and L-E, L-N 237v L-N 233v Could a resistance problem with the rods or may cause this? (Mat)

Hi All, i have been called to a rural property with a TT supply. The property has recently been rewired by another contractor but he refuses to come back to fix the problem. it is a large villa and has 5 rcds protecting various circuits, pool, aircon, sockets, oven, hob, etc etc. Ever since...