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RCBO tripping

Anthony Smith

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

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    Is the polarity correct throughout? If the switch was in the N for instance opening the switch would mean that the wiring between the switch and lamp would be held at 230-ish volts - whereas it would be close to zero (neutral potential) with the switch closed. A high impedance fault to earth on that wiring (e.g. due to condensation or corrosion) would then leak more current to earth while the switch was open - which could be the cause of the RCD tripping.

       - Andy.

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  • 0

    Is the polarity correct throughout? If the switch was in the N for instance opening the switch would mean that the wiring between the switch and lamp would be held at 230-ish volts - whereas it would be close to zero (neutral potential) with the switch closed. A high impedance fault to earth on that wiring (e.g. due to condensation or corrosion) would then leak more current to earth while the switch was open - which could be the cause of the RCD tripping.

       - Andy.

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