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I have installed a new ring main in a kitchen extension and tested for continuity and insulation resistance before connecting to Consumer Unit. As soon as main switch turned on, even with all the MCB's switched off, the RCD tripped. I removed all the connections to the consumer unit from the new ring and the rest of the circuits were fine. So problem is with the new ring main but I can't think what the problem is. Has anyone any advice?
 
I have installed a new ring main in a kitchen extension and tested for continuity and insulation resistance before connecting to Consumer Unit. As soon as main switch turned on, even with all the MCB's switched off, the RCD tripped. I removed all the connections to the consumer unit from the new ring and the rest of the circuits were fine. So problem is with the new ring main but I can't think what the problem is. Has anyone any advice?
Anything plugged in or connected via a fused spur?
 
I have installed a new ring main in a kitchen extension and tested for continuity and insulation resistance before connecting to Consumer Unit. As soon as main switch turned on, even with all the MCB's switched off, the RCD tripped. I removed all the connections to the consumer unit from the new ring and the rest of the circuits were fine. So problem is with the new ring main but I can't think what the problem is. Has anyone any advice?
Ring Final Circuit Simon not a ring main
 
I would say if the cables are giving the correct resistance readings,both as individuals,and in relation to each other,then what is left,is them being connected,in the wrong order...

Like Eric Morecambe...but with a MFT:)
 
As its morning now, and there's no drunken debauchee going on, did you do all the dead tests in order Simon, like the teetotallers suggested? :)
 

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