Discuss Wiring help for a double gang switch one room in the UK Electrical Forum area at ElectriciansForums.net

Yes sorry the each line is a whole T&E, new cables were connected with the old through connector blocks I believe I can't rip the ceiling off as it has been already plastered. So I believe each COM is a fitting ? however from one side there are only 3 T&E sticking..

You think that from each side I am suppose to wire those 'switch/lines' into the each COM on the backplate ? and have to keep doing a trial & error on each COM T&E cable where they go in L1 ? or connect all neutrals together and all lives in a Wago connector?

It might seem so simple but who labelled all these twin and earths just made a complete headache as to do guess work. Sorry and thanks for your reply !
If the 'switch/line' in the diagram is one Twin and Earth and is the original wire from the original fitting then it may well be line in (which would go to COM), and switched line out which would go into L1 with all the other lines for that 'side'.

Usually brown or Red will be permanent live and blue/black switched live (should be sheathed to indicate it's a switched live) but it's not guaranteed that it's that way round.

If it is like that, the issue may be whether you have a neutral at the switch at all and you'll have to test for that. (Hopefully any currently live wires are suitably terminated at the moment!)

If the new fittings are all being fed only from the switch then you'll need to have an incoming neutral from somewhere, which will go into a block with all the other neutrals.

You may need to check wiring at each fitting and connect the ends with a wago (all with no power of course!) and then check continuity at the switch to identify what each cable does. It's often quicker in the long run to do that, especially if the labelling hasn't been left clear for you.

I do hope it's a big backbox, that seems like a lot of cables for behind a 1 gang switch!
 
Who installed the cables? Why aren't they finishing the job?
 
From his initial posts I think you have a supply in and six separate cables to each light, genius.
 
From his initial posts I think you have a supply in and six separate cables to each light, genius.
Wago the switch lines of each bank of lights together and connect to the switch. Line in to common with loop across to other common. Neutrals wago together and same with CPC. Just need to work out which light is which ?
 
That's a real mess to leave you to sort out. Hope you are already scheming your revenge!

Methodical and slow is the only way to approach it. Ensure the circuit is off and continuity test each cable to identify what it is, shorting the cables at each light fitting in turn.

Determine which does each light, and separate them/label them yourself. They will be the outgoing feeds that go to L1 (Line) and neutral connector(suitable connector with them all together in the back box)

Then work out what you have with what's left - hopefully an incoming permanent line and neutral.

The neutrals will all go together, and since this is the switch point, hopefully none of them are actually switched lines that aren't identified.

Is this a one way circuit? The way the wires are currently put into the switch suggests 2 way, but maybe that's just someone's attempt through trial and error?

If it's one way, you will only be using COM and L1 terminals, with nothing in L2
 

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