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There are some scorch marks in that socket and historically water got in that wall, so perhaps a short caused a problem with wiring close to socket.

It did turn out to be damp. The electrician found faults in two bits of wiring. So he's suggested trunking for a short stretch to connect to another viable socket and bypass problem wiring. (This bit is three feet and can't be chased because of tanking to basement. And then chasing new wiring...

Thanks. I'm going to leave outside as beyond my capabilities. I did find a spiderweb and a few scorch marks on the earth cable inside one of the boxes inside that I opened. The web was all over the place so I wondered if this could have created a short. I've cleaned the spider's web however and...

Thanks all. In answer to earlier question, yes kitchen appliances are on another rcd which appears to be fine. The tripping rcd has two mcbs. One is the socket ring that is tripping the rcd. The other is a lighting ring that appears to be fine and doesn't trip the rcd.

Well they're in a wall that's damp on the exterior. However, it has been tanked and got insulated plasterboard in front so no damp on internal decorations. However the back boxes are attached to the damp wall. They're supposed to be isolated from it but clearly aren't as they're showing signs of...

The mcb isn't going off though it has been known to in the past and did once in the last week. Now I can't turn mcb on without rcd tripping. And in the last few days just rcd tripping.

the wired in things like the boiler and everything in the kitchen are on a different circuit which is still on. On the circuit in question all is unplugged. I've looked in a few of the sockets on the suspect walls on basement level and there is a little corrosion/rust on the back boxes but the...

Thanks. Yep they're chased into the walls and with tanking in the basement. Hence I really don't want an electrician to start ripping open walls etc. Is there any obvious sign when damp has affected a faceplate in a way which will trip rcd?

Hi I have a flat on two floors -- one in the basement. Over the last week the rcd has been tripping. It was intermittent at first and now the mcb in question won't come on without tripping the rcd. This coincides with some heavy rain. It's a circuit with sockets on it, all of the basement...