In article ,
Andy Burns wrote:
Just had the RCD trip out, went down to investigate, it tripped straight
out again, twice, so initially appeared to be a fault remaining
somewhere. To identify which circuit I switched off all MCBs on
protected side, the RCD then reset OK, so switched on MCBs one at a time
expecting RCD to trip when I reached the offending circuit, but they all
came back OK.

Snag is an MCB only isolates the line and an RCD will trip if a fault is
in the neutral. Of course it gives you a 50/50 chance of finding out which
circuit it is.

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*Errors have been made. Others will be blamed.

Dave Plowman London SW
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