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?
Wiring fault somewhere. It's ok with zero current but not with current flowing. Dodgy joint getting hot I'd guess at.
An insulation resistance test could give you more information about the condition of the wiring.
@Dramatic_Hammer 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?