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rcd?

can u tell me why my rcd does not trip when i send a fault current through it,but sometimes trips out by itself.it is a main switch rcd. it is 18yrs old
paul heath, June 2010
rcd`s are not designed to trip on fault current but if it detects live to earth or neutral to earth faults it should trip.to test if its working press test button

steve.e, June 2010