by sidewinder »
Wed Jul 08, 2009 5:49 pm
This circuit seems to run some sockets but it is not a ring.
In desperation I have contaced the previous owners of this house and managed to get some history. Here is the story. The MCB that trips the RCCB was on the protected side and worked fine except that Occationally the RCCB tripped. In an attempt to do some fault finding the previous owner moved one MCB at a time to the unprotected side and left it for a while to see if the RCCB tripped. I asked how occational it was and he said once or twice a month. This MCB was the second MCB out of 4 that he had moved (putting the first one back to the protected side when the RCCB tripped again).
I have just moved the MCB in question to the protected side and everything seems to work fine. I guess the RCCB will probably trip once or twice a month as it did for the previous owner. Atleast I can now test the circuits.
I am still confused why a non protected MCB would trip the RCCB!
I take the point of a shared neutral somewhere and I think persueing that is a good start point.
Thanks for the help. Not sure exactly how to progress but I am away working till next week so will think about it in the mean time. Any help still appreciated.
Thanks