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RCBO tripping

RBCO trips when I switch off circuit, can only reset by closing light switch, circuit has been working normally, suspect condensation but still odd

  • THanks wh it may be worth a try

  • It doesn’t trip with the lamps out

    But also doesn't trip with the lamps lit? Still sounds to me like a fault between switch and lamp - either the switch in the off position is shorting to something (e.g mis-wired 2-way switch) or reverse polarity with an earth fault on the switch line.

       - Andy.