I have an MCB on a circuit for one socket which stays on with nothing plugged in but trips after a short while when something is plugged in... What could cause this?
An insulation resistance test could give you more information about the condition of the wiring.
I'll see if one of the sparkys at work has the kit for that - looks fairly straightforward to carry out and interpret.
@Airhead started
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I have an MCB on a circuit for one socket which stays on with nothing plugged in but trips after a short while when something is plugged in... What could cause this?