Trying to figure cause of tripping

[Deleted member 9648]

Still not clear what the IR reading was on the pumps though?
Edit as post above crossed over......It'd be useful to eliminate a pump fault

 

[Gavin John Hyde]

Still not clear what the IR reading was on the pumps though?
Edit as post above crossed over......It'd be useful to eliminate a pump fault

It could be good to know for future reference and peace of mind, I am going back in few weeks to fit some extra sockets, change some plastic accessories for brushed steel so may if time permits have a look at the pumps a bit more.

 

[littlespark]

Faulty RCD socket. Not needed now so remove it and replace with normal socket.
You cant test the RCD socket now because of the CU RCD, (unless you bypass) but IMO the socket is stuffed

 

[Richard Burns]

I would say that with the socket in place the house RCD trips, with the socket removed the house RCD does not trip. Ergo the RCD socket is faulty.
Why it is faulty is difficult to say but you could try installing a new RCD socket as a test and see if the house RCD then trips, however with the access limitations this might not be worthwhile (or chargeable to the customer) but since effectively removing the redundant socket solves the problem stick with that.
You could take the socket home and try running things on it and see if it trips your RCD!

 

[Gavin John Hyde]

You could take the socket home and try running things on it and see if it trips your RCD!

Done just that and put on my kithen ring, it doesn't trip my Hager RCBO, board i fitted was BG. So can't explain that.
Customer hasn't rung me to say its gone bang this evening so all seems good!

 

[telectrix]

Faulty RCD socket. Not needed now so remove it and replace with normal socket.
You cant test the RCD socket now because of the CU RCD, (unless you bypass) but IMO the socket is stuffed

post #3.

 

[Toneyz]

Sorry, Gavin bit late on your post agree what others have said faulty RCD socket. If you're going back to do further work suggest incorporating new double socket on RFC that is accessible.

 

[Leesparkykent]

Done just that and put on my kithen ring, it doesn't trip my Hager RCBO, board i fitted was BG. So can't explain that.
Customer hasn't rung me to say its gone bang this evening so all seems good!

 

[Gavin John Hyde]

Sometimes the BG boards if you have only a few circuits are okay, sometimes they are a damn pain and do not align properly!! It is very much a lottery. If I have quite a few circuits then i have been fitting Schneider boards of late as they are good value and actually very good quality.

 

[Lucien Nunes]

Those initial IR readings, in the 1-3MΩ range, what was causing those - the pumps, socket or immersion? Clearly even 0.9MΩ isn't going to affect an RCD much with 0.26mA of leakage, but they are low enough to suggest a problem worth finding.