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  1. jimdevonshire

    Nuisance tripping of Air Circuit breaker

    MY main incomer to my building is protected by a 450kva/625A ACB it trips now and again but: there is no averload my max demand is 333kva, there is no fault on any of my circuits and the electricity board is saying that they have not had any problems with the supply voltage on any phase. Is it...

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