Warning notice Borrowed neutral on lighting circuit

[olsonn]

Doing a CU change, but have already spotted that there is a borrowed neutral between the two lighting circuits with both being fed by the same MCB. The job is in a flat and there is only a single light in the entrance hall on one of the circuits. The customer wants a straightforward swop and doesnt want to pay for any additional work. I have a couple of questions that hopefully somebody can help me with.

1. I assume that I can leave the 2 circuits being feed from the one MCB on the new board. It is a split board so if I try and seperate the circuits across the 2 RCD's obviously I would have tripping problems.

2. Can I put the neutrals of each circuit together on the board and the CPCs together or should I keep them seperate?

3. I know I will need to put a warning notice on the CU to highlight the borrowed neutral. Is there a specific wording I need to use or sticker that I could buy, or is it a DIY job?

 

[martinxxxxxx]

It is not really a borrowed neutral - it is a stolen live.

Look at 314.1 which is the rule that gave birth to the dreaded "17th Edition " boards. What you are proposing is a bodge and breaks this regulation, so you will need to note it a departure on the cert.

Sorry I see, I confused matters by mentioning the Dual RCD boards (pet hate) - What I really meant to say was it is not acceptable to break regulations just because they will cost and extra £2.50 of wire. Better to just address the problem and do a good job. I do realise he has fitted the board, but for anyone reading this thread I think it is important that the advice given is based on best practice and not a bodgers charter