Hello, I recently had a new consumer unit fitted into an old house and the associated full electrical system check and new earthing, etc. However we now have an annoying fault. Quite randomly, when some light switches are turned off in one area of the house, this trips the new 30 Ma RCD and fails the 13 amp ring main for the entire house. (this may happen once or twice a week) The light circuits in question are mainly flourecent ones. The company that fitted the new consumer board and did the testing said that perhaps a "neutral wire has been crossed over" but said that this would be expensive to track down. The fault can be induced by turning an older type light switch off slowly which causes some arching and then the failure. I would be grateful for any suggestion or ideas about this fault. Would it be worth replacing the flourecent lights for normal ones?
Kind Regards, Dick