Hi, I'v put in a 3 gang 2 way light switch, so that I can wire up a porch light. I'v already wired in the hall and landing light and they both work, but am having problems getting the porch light to work it has a three wire cable Brown, Blue, and yellow/green. I wired the blue wire to L1 and the brown to the com in the spare gang and there is no power going to the porch light, I'v tried looping a wire from the com to the main live wire, and this didn't work also tried linking all coms on the gang and this also didnt work after doing these I tried the hall and landing lights and they still worked can someone please explain where I'm going wrong :-$

You need a neutral fed to the outdoor light... You are very unlikely to have one at the switch...

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Verwood Handyman
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Hi, how do I go about feeding a neutral to the outside light?

If you are lucky, then all your wiring will be ron in conduit (Unlikely) in which case, you can just run a Neutral from the ceiling rose to the switch., and from there to the light..

Otherwise you'll need to be chasing out walls to run the neutral..

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Verwood Handyman
I Know it says I'm On-line, but I might have just left myself logged in, whilst I'm out....