Confusing light switch wiring

Discussion in 'Electricians' Talk' started by ant.frisoli, Feb 11, 2024.

  1. ant.frisoli

    ant.frisoli New Member

    Hi
    I want to change a single metal dimmer switch to a single standard switch, but the wiring is confusing (see attached photo). There are 3 brown wires, 3 blue wires and 2 yellow and green wires. The wires are connected as follows: 2 brown wires into L1, 1 brown wire into com, all 3 blue wires capped off and not connected, one yellow and green wire connected to the back box and one connected to the back plate of the metal light switch.
    The new standard light switch has L1, L2 and a Com connection. How do I wire this light switch?
     

    Attached Files:

  2. The Happy Builder

    The Happy Builder Screwfix Select

  3. WH55

    WH55 Screwfix Select

    Leave the blue cables connected together. You don’t need to touch them.

    Put the brown cables in exactly the same terminals as they are in the old switch, ie Com in old switch moves to Com in new switch. Same for L1. Ignore L2 in new switch.

    If your new switch is metal, connect the green / yellow CPC to the switch front plate as it is just now. If it’s plastic switch, you can remove that cable (but leave the other green/yellows connected together in the terminal in the back of the metal back box).
     
    HarryL1234 likes this.
  4. ant.frisoli

    ant.frisoli New Member

    I'll give that a go. Thank you
     
  5. Wellwisher

    Wellwisher Active Member

    All the earth wires must go together, not one in the switch and one in the back box as it was.
     
  6. Bazza-spark

    Bazza-spark Screwfix Select

    The one in the switch is a flylead back to the remaining earth in the terminal.

    It's fine!
     
    WH55 likes this.
  7. Wellwisher

    Wellwisher Active Member

    That is not what he said. Read his post again.
     
  8. Bazza-spark

    Bazza-spark Screwfix Select

    I know what he said, but I was going by what I could see in the photo, which could have shown more.
     
    WH55 likes this.
  9. WH55

    WH55 Screwfix Select

    That’s the thing with DIYers. I go with what I can see in photos and not what they say. The fly lead was very clearly a fly lead to a metal face plate. Therefore I said disconnect it unless the replacement was a metal switch. I did think about telling him to connect it to the back box along with the other CPCs but no doubt I would get shot down for saying that too, and it would have been utterly pointless. I might not be great :D ….. but I’m right.
     
    Bazza-spark likes this.
  10. Bazza-spark

    Bazza-spark Screwfix Select

    Grate lol
     
    Ind spark likes this.
  11. bright_Spark

    bright_Spark Screwfix Select

    I am great
     
  12. Ind spark

    Ind spark Screwfix Select

  13. Bazza-spark

    Bazza-spark Screwfix Select

    Grate.

    @WH55 see what you've started? :p:D
     
  14. WH55

    WH55 Screwfix Select

    Apologies, gents :D
     
    Bazza-spark likes this.
  15. bright_Spark

    bright_Spark Screwfix Select

    No apologies needed.
     
  16. Bazza-spark

    Bazza-spark Screwfix Select

    Get back to your pancakes Clucky :p
     
    Ind spark likes this.

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