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I haven't got a multimeter...yet. If I can't borrow one I'm off to buy one on my way home, along with a long cable to try and split the ring if I can (the wiring seems a little 'abstract' (to be polite!) What's the best way to test the RCD/MCB? This time the trip seemed to be random (ie...

It does have a button and it does trip. Unfortunately it's the only MCB on the circuit.

It's an mk one (at least the mcb was so I assume it is.) Alas I've tried that...many times! Thanks, Rich

Evening. Our downstairs socket ring tripped the mcb on Sunday. Despite resetting it and the RCD several times (the switches are on, they don't flick back off) there was still no power. I've unplugged and switched off every socket, still nothing. I've swapped the downstairs and the upstairs...