On 12/05/2021 18:26, John Rumm wrote:
On 12/05/2021 18:19, newshound wrote:
I have two five amp lighting circuits, notionally upstairs and
downstairs but because of a funny house layout they overlap a bit.

I just put in a new stair light circuit and, for convenience, changed
a single gang light switch for a two gang one to cover the new
circuit. It was only afterwards that I realised that left me with one
switch on the "upstairs" circuit and one on the "downstairs", so you
need to throw two breakers to ensure that unit is dead.

While I am not going to lose any sleep over this, I guess it might not
be compliant with current regs, can anyone confirm? I have a
relatively ancient CU with all circuits protected by one RCD so it is
fairly safe against isolation failure.

You have exactly the same situation as any place with two way switching
of the hall and/or the landing light. So it's a common situation to have
two separate circuits at one switch position. So perfectly acceptable
from a regs point of view.


I'm reassured. I've just realised I had the same situation in a previous
three floor house, where the middle landing had two way switches for
both the stairs going up and the stairs going down. It just seemed
counter to a "common sense" view that it's best to have a single
isolator for any wiring enclosure.