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  1. Rincewindwiz
    Offline

    Rincewindwiz Active EF Member

    Location:
    Ankmorpork
    OK so I screwed up!
    Went to replace my daughters ceiling fitment (old one yellow and paint spattered) expecting to detach the lamp, remove the old cable, attach the new cable and screw the rose into the existing ceiling fitment.

    Good plan which failed miserably when the new rose failed to screw onto the old ceiling fitment. OK so I took a photo (turned out badly - out of focus) of the existing wiring; removed the old ceiling fitment, attached the new. redid the wires (3 cables 6 wires, 3 earth wires) and got it wrong.

    Most of the light switches in the flat are all screwed up in that they activate other fittings!.

    I plan to trace the wires to the switch (so at least I get those right) and hopefully the rest follow a standard ring main diagram. Is this the best I can do to unscramble this mess?

    Thanks for any help
     
  2. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    your 3 cables are:

    1. L & N feed.
    2. L & N out to next light.
    3. Switch wire, red (or brown) to switch common. black (or blue) switched L from switch L1. this should be sleeved with red (or brown).

    what you should have in the light rose is 3 reds in centre terminal, 2 blacks in N terminal, goes to lamp blue. then the remaining black to lamp brown. the trick is determining which black is the switched L. need a meter to test. the switch cable is the one that shows open/closed when you operate the switch. ( testing done with supply isolated). if you post your location, one of us may be close to sort it for you. it's only a half hour's job.
     
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  3. Pete999
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    Pete999 Trusted Advisor

    Top Poster Of Month

    Location:
    Northampton
    Business Name:
    None
    You probably have like you say 3 x cables, live feed in live feed to next light and a cable to the switch, unwise to tell you what to do as I don't like untrained people messing with electrics, it can and often does end a travesty, if not a tragedy best advice get an Electrician to put up your new fitting, 1/2 to an hours work, not an expensive option for peace of mind is it?
    Good point Tel tell us where you are someone may offer to do the job for you, if you are near Northampton I'm your Man.
     
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  4. telectrix
    Offline

    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    SNAP.!
     
  5. Richard Burns
    Offline

    Richard Burns Trusted Advisor

    Location:
    Cambridgeshire
    Business Name:
    Richard Burns
    Be safe and not dead, switch off the power to the lighting circuit first.
    Follow Tel's advice
    1 way Light switch.gif
    (Your location should be Discworld not Earth)
     
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  6. westward10
    Offline

    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    All above correct but the only deviation from above is the cable to the switch maybe a twin red.
     
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  7. slingshot2000
    Offline

    slingshot2000 Regular EF Member

    And if it is a twin red it will be even easier (for an electrician) to sort in a couple of minutes.
     
  8. Rincewindwiz
    Offline

    Rincewindwiz Active EF Member

    Location:
    Ankmorpork
    Thanks guys.
    I am not an electrician but do have a degree in electrical engineering so understand the basics (pull the fuse before you start!). Also have circuit tester and voltmeter so, armed with this excellent advice, I'm off after lunch to try to sort it.

    If all fails you will probably see a plume of smoke from somewhere in N Watford as another ego goes up in flames!
     
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  9. Rincewindwiz
    Offline

    Rincewindwiz Active EF Member

    Location:
    Ankmorpork
    PS Thats N Watford near Ankmorpork, of course!
     
  10. littlespark
    Offline

    littlespark Electrician's Arms

    Location:
    Scottish Borders
    Youve got a number of possible issues here. The most important is identifying the switchwire. If you get that wrong, then your room switch becomes a short circuit between live and neutral.
    The switch isn't going to like that.
    The circuit breaker isn't going to like that.
    The poor sod operating the switch for you is certainly not going to like it.

    Joking aside, the suggestion of getting a qualified electrician is maybe not the cheapest option, but certainly the safest.
     
  11. Spoon
    Offline

    Spoon Trusted Advisor

    Location:
    Lancashire
    Apparently the OP had a degree in electrical engineering. Surely somewhere in that degree they were taught how to do basic testing?
    He should be able to do this himself.
     
  12. SWD
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    SWD Gender neutral Electrician's Arms

    Location:
    London
    Lol, we've all worked with "graduates" in the past........
     
  13. Spoon
    Offline

    Spoon Trusted Advisor

    Location:
    Lancashire
    But it's usually common sense they are missing.
    Always remember a bloke at our works who broke one of his shoe laces. When he got a new pair of laces he took his other shoe off. I asked what he was doing. Apparently he was copying how the laces where done on the shoe.
     
  14. elsparko
    Offline

    elsparko Regular EF Member

    Location:
    scotland
    i do this, i like my trainers/shoes to be symmetrical , if hes just copying and not doing it for aesthetic reasons then i agree hes a dolt
     
  15. Rincewindwiz
    Offline

    Rincewindwiz Active EF Member

    Location:
    Ankmorpork
    Hey give me a break. I did hte degree over 40 years ago!!.
    Anyway. attempt 1 was a disaster (blew a fuse!). Switch is grey and red and somewhere in the celinign it becomes black and red!!. Still traced that. Wired up as (I understood I was) advised (3 reds in the middle); Grey (black) switch to lamp, other two blacks together. Switching the light on blew a fuse

    I think there is something non-stanadrd going on here. Why in my first miswired attempt did several other lamps on the circuit change and/or other switches affected different lamps?

    Original wiring of ceiling rose was
    Red to lamp
    black and two reds together
    other two blacks together
    Dont know which of these blacks is the switch

    So I can identify the switch wires. The others are ring main. So I am trying to connect ring main to ring main (black and red) and then conect ring main to switch to lamp to ring main. Yes? I wonder if ring main red is actually red!!!
     
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