1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Take power from a light switch

Discussion in 'Electrics UK' started by Lol999, 4 Sep 2020.

Tags:
  1. Lol999

    Lol999

    Joined:
    4 Sep 2020
    Messages:
    10
    Thanks Received:
    1
    Country:
    United Kingdom
    Hi, new to the forum, consider myself a bog standard diy-er, better with wood and paint but happy to try most things.
    I'm renovating a property and in the downstairs 'outhouse' there's a light with a single switch on or off.
    I would like to put another light in another part of the outhouse and it would be convenient if \I could take a spur from the existing switch to feed a new switch and light fitting.

    If this is possible could someone help me out with the wiring scheme please?
     
  2. Sponsored Links
  3. AndyPRK

    AndyPRK

    Joined:
    4 Jan 2009
    Messages:
    5,487
    Thanks Received:
    528
    Location:
    Herefordshire
    Country:
    United Kingdom
    Take a pic of the rear of the switch wiring and back box and post
     
    • Thanks Thanks x 1
  4. Lol999

    Lol999

    Joined:
    4 Sep 2020
    Messages:
    10
    Thanks Received:
    1
    Country:
    United Kingdom
    Will do mate - thanks.
     
  5. Mottie

    Mottie

    Joined:
    27 Feb 2017
    Messages:
    14,707
    Thanks Received:
    1,670
    Location:
    Essexshire
    Country:
    United Kingdom
    I doubt it. From my little knowledge of wiring, light switches usually only have a live/switched live and an earth. No neutral.
     
    Last edited: 4 Sep 2020
    • Like Like x 1
  6. muffking

    muffking

    Joined:
    2 Dec 2004
    Messages:
    426
    Thanks Received:
    25
    Location:
    Lincolnshire
    Country:
    United Kingdom
    The picture Andy requested should tell if there's a Neutral at the switch.
    Alternatively it may be an option to explore taking the supply from the light fitting.
     
  7. AndyPRK

    AndyPRK

    Joined:
    4 Jan 2009
    Messages:
    5,487
    Thanks Received:
    528
    Location:
    Herefordshire
    Country:
    United Kingdom
    Shed/outhouses can be different though
     
  8. Lol999

    Lol999

    Joined:
    4 Sep 2020
    Messages:
    10
    Thanks Received:
    1
    Country:
    United Kingdom
    Okay so here's the offending switch. The other one I took the front plate off and it was so old Moses had done the safety check so I left it alone as it required further disassembly to get to the gubbins.
     
  9. AndyPRK

    AndyPRK

    Joined:
    4 Jan 2009
    Messages:
    5,487
    Thanks Received:
    528
    Location:
    Herefordshire
    Country:
    United Kingdom
    Humm can you see any black wires above the switch ?

    If not, no you can take a feed from there.

    You should be able to take it from the light.
    Post pics of that if you want help
     
  10. Sponsored Links
  11. Lol999

    Lol999

    Joined:
    4 Sep 2020
    Messages:
    10
    Thanks Received:
    1
    Country:
    United Kingdom
    I changed the light fitting coupled to this switch today as it was ancient. It had red, black and earth wires, 1 of each. Would that be more suitable?
    If it made life easier I could have the switch turn on the light it is connected to at present and 1 other lamp.
     
  12. AndyPRK

    AndyPRK

    Joined:
    4 Jan 2009
    Messages:
    5,487
    Thanks Received:
    528
    Location:
    Herefordshire
    Country:
    United Kingdom
    No not more suitable.

    Yeah you could take the feed from the light and require both switches to be on.

    Or just use leds (only have the one existing switch) where it wouldn’t matter to and have both lights on at the same time
     
  13. Lol999

    Lol999

    Joined:
    4 Sep 2020
    Messages:
    10
    Thanks Received:
    1
    Country:
    United Kingdom
    With the above scenario of wiring I described could I loop another lamp in so both are on at the same time?
     
  14. AndyPRK

    AndyPRK

    Joined:
    4 Jan 2009
    Messages:
    5,487
    Thanks Received:
    528
    Location:
    Herefordshire
    Country:
    United Kingdom
    Yeah. Connect from the existing light
     
  15. JohnW2

    JohnW2

    Joined:
    28 Jan 2011
    Messages:
    46,784
    Thanks Received:
    3,034
    Location:
    Buckinghamshire
    Country:
    United Kingdom
    What does the "other switch" do - is it related to the light and switch we are talking about?
    Do you know where the cable from the fitting (with red, black and earth) and the cable from the switch (with red, red and earth) go to? Since they are clearly different cables, I presume that they must meet at a junction box of some sort - and if that is accessible, it should have both the 'permanent live' and neutral that you need for your new light.

    Kind Regards, John
     
  16. AndyPRK

    AndyPRK

    Joined:
    4 Jan 2009
    Messages:
    5,487
    Thanks Received:
    528
    Location:
    Herefordshire
    Country:
    United Kingdom
    I was thinking they were single and earth cables at the switch
     
  17. JohnW2

    JohnW2

    Joined:
    28 Jan 2011
    Messages:
    46,784
    Thanks Received:
    3,034
    Location:
    Buckinghamshire
    Country:
    United Kingdom
    Yes, although it's not totally clear in the pic, I also thought that's what they probably are, unusual though such cables are (I should have written 'cables', rather than 'cable').

    My point was that there are two red conductors at the switch (which must be L and S/L) and, we are told, just one black and one red at the light (which must be N and S/L) - so, as I said, those two sets of (different coloured) conductors must meet somewhere (presumably a JB or suchlike), and both L and N must be present at that somewhere. Do you disagree with that?

    Kind Regards, John
     
Loading...

Share This Page