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  • "um, mate, your house has no earth....."

    Spooky. We had the same issue at ours - 10 year old CU installed fresh as part of an extension before we bought the place.

  • Is there an obvious test for this that a user can do?

    Not that I am aware of. We had a sparky come in to look at the whole thing - it was only when doing a fuller inspection that he caught it. It didn't seem to affect anything day to day, but any surge would have killed all the things in our house!

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