Went to a job today where an RCD was tripping after heavy rain and taking two MCBs with it. The two MCBs are both for ring circuits - one apparently just for a microwave, and the other for most of the downstairs sockets and outside lights.
IR testing was a nightmare due to sockets in inaccessible places and PIRs / night sensors on the outside lights, but I'm fairly sure the problem was a JB for an outside light with a gland missing, allowing water to get in.
However, what is confusing me is why TWO MCBs would have been tripping. Also, he said it took a few hours before they could both be reset.
Why would an MCB on a different circuit not reset? Does this mean there must be an unrelated fault on that circuit? Or just a dodgy breaker (the CU's only 2 years old)? Or something else I'm missing?
Any thoughts greatly appreciated.
IR testing was a nightmare due to sockets in inaccessible places and PIRs / night sensors on the outside lights, but I'm fairly sure the problem was a JB for an outside light with a gland missing, allowing water to get in.
However, what is confusing me is why TWO MCBs would have been tripping. Also, he said it took a few hours before they could both be reset.
Why would an MCB on a different circuit not reset? Does this mean there must be an unrelated fault on that circuit? Or just a dodgy breaker (the CU's only 2 years old)? Or something else I'm missing?
Any thoughts greatly appreciated.