Don't come across this very often - but I've had a CU delivered for a caravan job (not static btw), and it's been supplied with a neutral conductor from the main switch to the neutral bar! Definitely an oversight, but I've got plenty of singles cable in stock, so rather than send it back, I thought I could reuse what I have. However I've scoured the regs book, and I can't get a definitive answer as to what size this particular conductor should be. Obviously in a domestic setting it's either 16 or 25.
It's a 25A main switch with RCD and the highest the incoming current will be is 16A, so I can't see it's going to need a huge neutral conductor. I'm guessing a 4mm will do.
If there is something in the regs about this, could someone point it out to me. Cheers.
It's a 25A main switch with RCD and the highest the incoming current will be is 16A, so I can't see it's going to need a huge neutral conductor. I'm guessing a 4mm will do.
If there is something in the regs about this, could someone point it out to me. Cheers.