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Identifying switched live in ceiling rose

Discussion in 'Electrics UK' started by QuestionQuigley, 1 May 2021.

  1. QuestionQuigley

    QuestionQuigley

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    I'm about to replace a light with an old-style ceiling rose with a modern fitting. Before taking the old one down I want to identify the switched live wire, which has not been marked.

    Looking at this photo, am I correct in thinking that the black wire on the right must be the switched live as it is "on its own", i.e. it is only connected to the light, not to any other wires going into the ceiling?

     
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  3. JohnW2

    JohnW2

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    Yes, that is correct. If it were not the 'switched live', the light would not be able to come 'on' (or 'off') when one wanted it to :)

    Kind Regards, John
     
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  4. sparkwright

    sparkwright

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    Yes, it's the black on it's own.

    As long as you mark it or remember it, you can't go far wrong.
     
  5. AndyPRK

    AndyPRK

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    Paint it or tipex it or put red or brown tape round it
     
  6. SUNRAY

    SUNRAY

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    Thank you for asking before making the mistake so many make.
     
  7. 333rocky333

    333rocky333

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    As marks dont easily show on the black, mark the paired Red that goes with it too, or the white sheathing as back up
     
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  9. Sureitsoff?

    Sureitsoff?

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    i use a small cable tie to mark switched lives in this situation, sleeving has been known to fall off DAMHIKT........
     
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  10. AndyPRK

    AndyPRK

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    Exactly.

    marking the white sheath with S for switch is also a good tip.
     
  11. JohnW2

    JohnW2

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    ... provided one has a good enough memory - or, at least, a well-established convention which one doesn't forget ("S for Supply" comes to mind) :)

    Kind Regards, John
     
  12. AndyPRK

    AndyPRK

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    You can mark yours SW John :D
     
  13. SUNRAY

    SUNRAY

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    I find cable ties, no matter how small, tend to get in the way when threading or unthreading the splayed cables in cable entries.

    I favour sharpie pen/tippex/paint etc on sheath and both live wires.
     
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  14. JohnW2

    JohnW2

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    You're a bit late in giving me that advice - that is precisely what I have been doing for very many years (possibly since before you were born!) :)

    Kind Regards, John
     
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