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Hi just after some clarification, just had a secondary 2 way RCD protected ccu installed for a new kitchen extension. The electrician has run 16mm tails too the new unit from the supply. My question is, the earth he has run in is 10mm is this big enough or should it be 16mm? The unit is...

Hi Hope someone can help! 32A MCB trips at least once a day, has been doing it for about a week. The circuit is the downstairs ring. can't pin it down to anything, no recent work has been done and it doesn't follow any pattern. Everything has been unplugged at some point. It will also trip...