OP
nickblake
Squirrels
Discuss RCD tripping- earth neutral fault in the Australia area at ElectriciansForums.net
he must live in a rough area infested with rats
Neutral to Earth fault (short circuit) plastic outer cover bitten and damaged, short circuiting the Neutral to Earth. The RCD trips (even if you keep all the MCBs off). No way to get power back .. either you find the fault and repair it or bypass the RCD (not recommended)and the fault was......??????
yep -never bypass an rcd
N-E fault usually trips rcd when you plug in a class2 appliance on a protected circuit
it trips with the mcb off because you have zero current flowing in the line. anneutral/earth fault wilcause current to flow throgh the neutral to earth, thus causing inbalance. with class 2 equipment, the earth is not connected to the appiance, so no fault current. sssssssimple.
Yes. The RCD trips when the current flowing in L and N are different by more than 20ish mA.Can I ask stupid question in this subject please? Could a Live/Earth fault cause tripping RCD also? If you had a rcd protected board is it possible for the rcd to trip and not the mcb on a live/earth fault? Thanks
Thanks for that. I had a db which main rcd had tripped. I turned all circuits off,reset rcd and turned on one at a time turns out it was an immersion heater. So was curious what may have caused the rcd to trip and not mcb. Thanks againYes. The RCD trips when the current flowing in L and N are different by more than 20ish mA.
So if there is a L to E leakage of 10's of mA you would expect the RCD to trip, but not the MCB.
it sometimes happens that appliances with a heating element (immersion heater, washing machine, kettle, etc) develop a leakage to earth, which will trip an RCD, but not the MCB.
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