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    Mystery grey wire in UK light switch

    333rocky333 is in fact correct! There is a red inner. I couldn't see this until I took a close up photo with my phone. To my tired old eyes (even with my reading glasses on) I couldn't distinguish the red from the copper. :(
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    Mystery grey wire in UK light switch

    It's a single core cable. It doesn't have separate outer and inner sheathing.
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    Mystery grey wire in UK light switch

    The other end of the two-way switch also had a single core gray cable. This one must be wired to the light. But what the gray cable in the other switch (that I originally asked about) was intended for is a mystery to me. I guess one day I will find out if I ever end up needing to do any work at...
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    Mystery grey wire in UK light switch

    The house is in Sheffield. So it sounds like this wire is probably not connected to anything at either end, and is likely useless today. I had hoped I might get lucky and find it was a neutral wire, which would have been great for smart lighting, but thought that was pretty unlikely given the...
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    Mystery grey wire in UK light switch

    I've just moved into a new house (new for me, quite old actually) and am trying to understand the current electrical wiring. As part of this I opened up one of the existing light switches to take a look. It's a two gang switch, with the left switch being a 2-way and the right switch being a...
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