Changed 2 gang 1 way light switch in lounge, now no light in kitchen

Connect the 'orphan' red wire to the same switch terminal as the incoming supply.

Bill

That is the very worst option.

inspirational

Jim K

But it is the correct answer:-)

It's a 2 gang light switch with 4 red cables. One is the supply in, one is the supply out to the kitchen lights and the other two are the switched lives to the two living room lights.

Ok if you can guarantee that. But not without doing further tests.

I suspect the OP will perform a simple test especially for you, he may even report back...

Jim K

Well its looped through innit, the orphan wire is not live cos its the loop off to the kitchen and should go to the unswitched end of the current switch, as to what you did with the other light, only you can tell!

Brian

But nothing will go bang.

I doubt that. Far more likely just a second live feed from the second light - loop in loop out with switch drops. If it were the feed to the second light, where does the neutral come from?

Which is why IMHO it needs investigating further.

'A less commonly met system of wiring lighting circuits.'

If you were using this method of wiring, why run two feeds to a two gang switch?

Those are not my words - AFAIK that wiring method is still commonly used - and it is a requirement to use such a system on some council house rewires and it is still my prefered method of install on the larger houses I rewire.

There are not two feeds unless you class a "feed in" and a "feed out" as two feeds. There is one feed in, one feed out to the kitchen LIGHTSWITCH and two switched lives to the two lounge lights.

In which case there'd be a link wire also between the two switches?

There was such a link - reread the OPs post:-)

"the one that connected to C on one side, and lenghthened to C on the other side".

I read that as the 2 commons being inked.

Is it bollocks! Nothing can go bang, and the chances are from what he said he's identified the other three already.

Bill

I thought that systems like this were deprecated because of the radiation from single cores, as opposed to twin core cable? Or am I talking rubbish (not unknown)

Ah - must try harder. ;-)

Don't worry - the OP is still looking for the second supply for the other lounge light!