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Fuse box main trip and is tripping

My fuse box keep tripping on main fuse will do it three times a day sometimes won't do it for week try appliance different everytime

1 Answer from a MyBuilder Electrician

Best Answer

Probably low insulation resistance (IR) on one of the circuits connected to the RCD. The IR can vary due to moisture/ingress of water, so if you have a damaged cable under thee floor or concealed in a wall etc and some dampness is getting it that could be causing it to trip intermittently.

Best course of action is to get all circuits fully tested to identify if it is definitely a low IR problem and (80% likely it is) then trace the fault on the affected circuit and repair/rewire as required.


Answered 12th Aug 2015

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