Borrowed neutral on split load board

[Brightonbill]

I have a client with what appears to be an intermitent fault on the lighting, but trips the power.

The installation has a 16th edition board with sockets on the RCD side, and lighting on the other side as usual.

Occasionally when the landing light is switched the RCD trips on the socket side. Would a borrowed neutral cause this. The lighting circuit itself has RCBO on it that doesn't trip; does the RCBO have anything to do with it.

I haven't checked for a borrowed neutral on the lighting yet, but even if there was one I can't see why that would affect the other RCD side.

Many thanks in advance

 

[Penguin]

My guess is that the wiring is late 60s early 70s.

The landing is 2 way, and the hall is 2 way. Both are on the same RCBO which never trips, only the RCD on the socket side of the board.

As I’ve combined all the circuits into one and put them on the RCD side I thought that would eliminate any possible cross connection/borrowed neutral.

So I’m looking at a fault rather than a cross connection I think.

Why are there so many different Manufacturers Breakers in the DB.??

 

[Brightonbill]

Why are there so many different Manufacturers Breakers in the DB.??

Why are there so many different Manufacturers Breakers in the DB.??

Can’t really answer that one. I have a feeling that the RCBO was part of an en-suite installation.

As for the Volex I don’t know. Possibly a fault?

 

[Brightonbill]

Have you tested the current earth leakage and/or ramp tested the rcd?

No. I did a standard auto test which was fine. I’ll give it a ramp rest tomorrow and check the earth leakage.