Coding question

Judd · Jul 28, 2021

I will try to explain this as best I can,
Did and EICR this afternoon, multi story apartment block DB's in flats are effectively submains from switch room in basement,
Fed with 3 core SWA, 2 cores supply peak side and the 3rd core supplies off peak side.
Problem is, is that the neutral is shared by both sides and the right hand main switch does not isolate the neutral for the off peak loads, the neutrals for the off peak loads are just linked across the neutral bar. So the only way to isolate both line and neutral for the off peak is to isolate BOTH main switches.
Fixing this is not a problem I'm just unsure what code this warrants.
Any help?
Cheers

Deleted account · Jul 28, 2021

You would have to isolate both to open the CU anyway. No code.

westward10 · Jul 28, 2021

Those switches clearly indicate they isolate both poles but with the current set-up this is not the case. It is a requirement that isolation for a dwelling isolates both live conductors, they do not.

loz2754 · Jul 28, 2021

I agree with @westward10 .
There is potential danger, if working on the off peak side with the peak side still energised.
Therefore, C2.

newfutile · Jul 29, 2021

Maybe a dual isolation label if you cant add a neutral link to the top of the off peak main switch, also a domestic consumer has to have double pole isolation .