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    Calling all HUKD electricians - need help changing a light fitting...

    Ok, so I'm getting a new bathroom installed in the next few weeks, and had to change the light fitting as the old one didn't suit the new bathroom.

    Anyway, my girlfriend bought a new light fitting, and decided she was going to install it on her own. She managed to get the old fitting off on her own, but didn't write down how it was connected to the wiring, although it has 2 holes. The cable from the ceiling has 4 cores, red, yellow, blue and black.

    The new light fitting has a fixed terminal (I think that's what it's called) with only 3 holes, L, Earth & N.

    My question is, what colour wire(s) goes in what holes? I assume the red is live, the yellow is earth, and the black/blue wires are neutral, is that correct? Does one of the holes on the light fitting have 2 wires going into it.

    If it helps there is only one switch that controls the light, and there is an extractor fan that comes on with the light.

    Cheers for any help!!

    22 Comments

    i believe one wire is called the switch line usually red with a black bit on it which you dont seem to have.

    Probably not correct. Because it is in the bathroom I urge you to get the job done by a competent person.

    sorry black with a red bit on. which is probs like you say yellow earth, red live, blue neutral and the black is switch line but take melipona's advice
    maybe this might help
    ultimatehandyman.co.uk/lig…htm
    Edited by: "nightstud" 21st Oct 2010

    Banned

    If the original fitting only had 2 'holes' then surely you have a live and neutral going in, and then 2 wires going out to the extractor fan?

    Original Poster

    colinsunderland

    If the original fitting only had 2 'holes' then surely you have a live … If the original fitting only had 2 'holes' then surely you have a live and neutral going in, and then 2 wires going out to the extractor fan?



    She "thinks" that the back & blue wires were together, and the red & yellow wires were together.

    Banned

    that sounds like it might be right

    Original Poster

    melipona

    Probably not correct. Because it is in the bathroom I urge you to get … Probably not correct. Because it is in the bathroom I urge you to get the job done by a competent person.



    That was the original plan, but as she decided to go ahead herself we're now left with no light in the bathroom until I can get an electrician out....

    civms47

    She "thinks" that the back & blue wires were together, and the red & … She "thinks" that the back & blue wires were together, and the red & yellow wires were together.


    could be wrong but the extractor fan probs comes of the switch seperate and as for "two holes" that would be liv and neutral the earth may have gone on the metal of the bracket? and pretty sure the switch line goes in abox of some type

    Although made with good intent answers that say "could be wrong" or "I believe" or suchlike should be totally ignored.
    Please kill this thread now.....

    melipona

    Although made with good intent answers that say "could be wrong" or "I … Although made with good intent answers that say "could be wrong" or "I believe" or suchlike should be totally ignored.Please kill this thread now.....


    i didnt tell him to do it i infact told him to take your advice.
    but most people like myself will still try to do it anyway and if they do insist on doing it its an idea to have a bit of help
    anyway found this from money saving expert not my advice! deal with electrics at your own peril.
    Typial ceiling rose wiring...

    Red - Always live
    Black - neutral
    Green / yellow - earth.

    ***Black with a small red sleeve - This is the switched live.

    If changing a fitting to one that only has a 3 way connector, you will need a terminal connector to join the other cables and then tuck it into the ceiling void.

    You should end up as follows.

    All the reds, connected together.

    All the blacks connected together. Then connect the blue from the light fitting into this group.

    The black with a red sleeve, connected to the brown of the light fitting.

    All green / yellows connected together.

    melipona1 person likes this

    Probably not correct. Because it is in the bathroom I urge you to get the … Probably not correct. Because it is in the bathroom I urge you to get the job done by a competent person.


    +1

    But, If you must do this yourself[color=red]the yellow isn't earth it is a switched live for your fan[/color] and should be connected to the positive. Here is an example of the complete circuit
    The earth wire will be either Green or Striped green & yellow. Never just Yellow

    Edited by: "trog0" 21st Oct 2010

    trog0

    +1But, If you must do this yourself the yellow isn't earth it is a … +1But, If you must do this yourself the yellow isn't earth it is a switched live for your fan and should be connected to the positive. Here is an example of the complete circuitThe earth wire will be either Green or Striped green & yellow. Never just Yellow


    out of curiosity which one out of blue black and red is earth? as i have only ever seen the switched live black with red sleeve.

    nightstud

    out of curiosity which one out of blue black and red is earth? as i have … out of curiosity which one out of blue black and red is earth? as i have only ever seen the switched live black with red sleeve.



    None according to the IEE 60446 standard always [color=gold]green[/color]+[color=green]yellow[/color] stripe

    as an aside the fan may be earthed elsewhere hence no earthwire
    Edited by: "trog0" 21st Oct 2010

    supermod

    civms47

    that was the original plan, but as she decided to go ahead herself we're … that was the original plan, but as she decided to go ahead herself we're now left with no light in the bathroom until I can get an electrician out....



    civms47, that seems like by far the most sensible course of action - with any electrics if you have any doubts its best to call a professional as unfortunately mistakes can be fatal. Hope you can get it sorted out - in the meantime get some candles out and make it romantic so your girlfriend feels better about having no light

    Edited by: "sigma" 21st Oct 2010

    nightstud

    i believe one wire is called the switch line usually red with a black bit … i believe one wire is called the switch line usually red with a black bit on it which you dont seem to have.

    nightstud

    out of curiosity which one out of blue black and red is earth? as i have … out of curiosity which one out of blue black and red is earth? as i have only ever seen the switched live black with red sleeve.


    dont see how asking which one is the earth will get someone killed and im not telling anyone how to wire anything was saying the one wire will be switch line which the op didnt no i think he'd get him self killed first if he wired it the way he said in the desc.

    Coming from an electrical installation background I find this thread well scary.

    Original Poster

    sigma1 person likes this

    civms47, that seems like by far the most sensible course of action - with … civms47, that seems like by far the most sensible course of action - with any electrics if you have any doubts its best to call a professional as unfortunately mistakes can be fatal. Hope you can get it sorted out - in the meantime get some candles out and make it romantic so your girlfriend feels better about having no light



    Romantic??? Are you kidding, I'm well annoyed with her, if she'd left it alone in the first place I wouldn't have this problem!!! As for making her feel better, don't get me started......!
    Edited by: "civms47" 22nd Oct 2010

    greg_68

    Coming from an electrical installation background I find this thread well … Coming from an electrical installation background I find this thread well scary.



    I agree, If some of the advice offered had actually been taken there was a real chance of electrocution.

    Electrics is "easy" for those of us that understand it but it needs to be treated with respect.

    It was evident from the first posts that what was being asked and some of the advice being given was unsafe. I reported the thread quite early on and suggested its removal, but the mods obviously think it is OK.

    Original Poster

    melipona

    I agree, If some of the advice offered had actually been taken there was … I agree, If some of the advice offered had actually been taken there was a real chance of electrocution.Electrics is "easy" for those of us that understand it but it needs to be treated with respect.It was evident from the first posts that what was being asked and some of the advice being given was unsafe. I reported the thread quite early on and suggested its removal, but the mods obviously think it is OK.



    I do understand electrics/circuits etc to a certain extent, but wasn't sure on this one. I'm grateful for all the advice given, but because there are so many differing opinions I'm going to play it safe and get the advice of a sparky.

    It could have been worse, when I first came into the house the gf was poking about with a metal screwdriver, she thought it was safe because she'd turned the switch off. WOmen and diy, not a good combination.....
    Edited by: "civms47" 22nd Oct 2010

    With respect if you did understand electrics you would not have assumed yellow was earth. It was a potentially dangerous assumption.

    A competent person could probably do this job in about 10 minutes, a person without the correct competence may not finish it in their lifetime.

    Original Poster

    melipona

    With respect if you did understand electrics you would not have assumed … With respect if you did understand electrics you would not have assumed yellow was earth. It was a potentially dangerous assumption.A competent person could probably do this job in about 10 minutes, a person without the correct competence may not finish it in their lifetime.



    I don't particularly want to argue, you've provided sound advice so far. The assumption was based on my admittedly limited knowledge, on the basis that earth is green/yellow. This thread was an attempt to confirm or otherwise these assumptions, so that I could ultimately decide whether to act on them or not....

    Original Poster

    Sorted eventually, earth wire was tucked back in the ceiling, ah well, all sorted and no-one died....
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