1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Anyone know how to wire a smoke alarm with a few minutes spare to help please?

Discussion in 'General Discussion' started by NutterzUK, 28 Oct 2020.

  1. NutterzUK

    Hitman

    Joined: 18 Feb 2010

    Posts: 936

    Hi,

    In our house we have 2 smoke alarms. One upstairs on the landing and one downstairs in the hallway. They've both been damaged by plasterers/dust, and so go off when they shouldn't. We've got a 1 year old, and waking up to a false alarm from the smoke alarm and a screaming baby isn't a fun time.

    I figured it should be easy to replace them. Went out, bought 2 wired smoke alarms.

    I came back, took the first alarm off and this is what I see:
    [​IMG]

    From the ceiling is:
    - Brown
    - Black
    - Grey
    - A yellow/green (earth) which doesn't attach to anything.

    The plug that went into the old alarm has:
    - Brown
    - Yellow
    - Blue

    They were matched like this:
    - Grey -> Blue
    - Black -> Yellow
    - Brown -> Brown.
    - Yellow/green -> nothing.

    The new smoke alarm comes with:
    [​IMG]
    upload image
    - Brown
    - Blue
    - White

    My assumption would be that this wants to be:
    - Brown -> Brown, just like it was.
    - Grey -> Blue, just like it was.
    - Black -> White... I'm not sure what this is but it's the only ones left. Before this was Black -> Yellow.


    I've yet to take the upstairs alarm off. I believe the black wire that used to go to yellow, but now perhaps to white, is for interconnecting the alarms - though I may be wrong.

    Just before I go with my assumption, I thought I'd better ask. It's difficult for us to get an electrician at the moment, and I really want to get the smoke alarms up - installing it is fine if I know which wires match which.

    Really appreciate any advice!
     
  2. Diddums

    Capodecina

    Joined: 24 Oct 2012

    Posts: 20,780

    Location: London

    Your assumption is spot on.
     
  3. NutterzUK

    Hitman

    Joined: 18 Feb 2010

    Posts: 936

    Thanks Diddums!
     
  4. NutterzUK

    Hitman

    Joined: 18 Feb 2010

    Posts: 936

    Got this wired up today and it's all working, it was nice and uneventful :).

    Thanks for your help @Diddums
     
  5. Diddums

    Capodecina

    Joined: 24 Oct 2012

    Posts: 20,780

    Location: London

    Happy to help mate :)
     
  6. rubberduck

    Mobster

    Joined: 8 Feb 2004

    Posts: 4,521

    and for those of you who are watching in black and white, the pink is next to the green (wire).
     
  7. vanpeebles

    Sgarrista

    Joined: 22 Aug 2004

    Posts: 7,606

    snokka