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Does anyone know if it is common for radiators that are conncected by plastic pipes to be at a slightly different potential to house earth? Should I be worried? Thanks

I did test them against house earth and this is what I am concerned about. The question about cable testers is I guess a separate issue but is what led me to test them in the first place.

Thanks for the replies. I have tested my meter and think it is pretty accurate. Is it possible that just the fact that water is running through a raidator connected by plastic pipes might make it a slightly different potential to house earth. Sorry to be dim but what is capacitive coupling...

I have had problems in my house with hidden wire testers showing many areas are live when they are not. It is a new house and only 3 years old. I wondered if it could be a problem with the heating system wiring. My radiators are connected with plastic piping but when I use a voltmeter to...