Discuss RCD issue, or is it? in the UK Electrical Forum area at ElectriciansForums.net

the pict

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Changed a consumer unit everything fine all test came back hunky dory, but one RCD would not trip on the test button so swapped them around, same deal,I then got random trips from unassociated circuits IE kitchen ring plug in kettle and the opposite RCD would trip disconnect incoming earth RCD,s behave normally Ze .18 didn't clamp the earth to check any current flow did't think of it till on my way back, the only other thing I did after the tests was connect an outside light for the tenant to existing cable, so i am thinking a shared N any clues would be great
Dev
 
Please tell us you don't intend to leave cpcs disconnected:confused1:

And to go one further than this, not only should you not be disconnecting CPCs whilst the installation is energised, your IR tests should be carried out with all CPCs connected to the busbar and all bonding in place.
 
I think you have mis read my OP,

I don't think it's that the OP has been misread, than the fact you've explicitly stated you're going to be disconnecting CPCs with the assumption you will be re-energising (otherwise how would you be able to see that RCDs are behaving).

so my plan is to disconnect the earths one by one to get the RCD to behave and hopefully indentify the culprit
 

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