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Yes did, an old installation. I don't have the results to hand as my colleague does.  Around 50mega ohms.  Not clear but well within the 2megaohms minimum.  Clearly a possible issue but I've had results similar on other installations but been able to complete the RCD test fully.

Hi, thanks for getting back to me.  I didn't.  I had a problem on Friday with an RCD not tripping in time and switched off all circuits and did the RCD test.  Do you think there may be problems with things being plugged in, ie. fridge capacitor or something on other equipment?

Hi, recently did quite a bit of work on a bungalow (DB change, kitchen wired, extra sockets, smokes etc.,).  Had some issues with installation but managed to locate faults and everything tested off fine.  A couple of weeks later customer contacted me to advise RCD tripping intermittently and...