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Originally Posted by Skywave
But when you say "the water pipes", we have already agreed that some of your piping somewhere contains plastic couplings. Hence, no connectivity.
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Only pipes that I have seen with plastic joins hence no conductivity was the gutter drain pipes.
The mains water pipes are all copper in downstairs. Upstairs in the bathroom, behind the washbasin, I saw plastic pipes. But that work has been done recently.
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What you need to do now is to check for conductivity between one of those wall socket's earth point and the metal of the metal pipe that brings water into your house at the point where it enters your house. Since that pipe will be at 'electrical earth' - or most certainly should be, since it is metal and will be buried in the ground - I think you should see a low resistance between it and the E pin of a wall socket.
Let us know if that is - or isn't the case. Thanks.
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Yes, that is what I have done already, checking the wall sockets' E pins connectivity with the water pipes, and there is no connectivity.