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Thread: Any sparkies on here? Help needed!

  1. #1
    Regular Member stuball's Avatar
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    Default Any sparkies on here? Help needed!

    Trying to avoid a hefty call out charge if posible but have a problem with a light circuit in our house.
    Basically, my wife switched on our inside landing light and it blew. She then noticed that the hall light no longer swiched on and the downstairs toilet light and fan no longer switched on. I went to reset the breaker assuming this was the problem but it had not tripped.
    Our kitchen lights and dining room main lights all still work but the aforementioned ones still don't. We have a smoke alarm on the same circuit and that still works too.
    What can be the problem? I am worried about any problems caused by leaving the light circuit on but if i switch it off the smoke alarm will beep all night to say there is no power!
    Help please!!

  2. #2
    Regular Member lee gsi's Avatar
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    Default

    Sounds like one of the light switch wires has come out of the switch (But I am no sparky, just a DIY'er)

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    Regular Member jimbojetset's Avatar
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    Manually switch off and back on again every breaker & rcd in the box... starting with those on the circuit/s affected... I have had them trip before but still look as if they are on...

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    Regular Member Ademusic's Avatar
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    You sure they're not on a seperate breaker? If you have a new type consumer unit, the lighting circuits should all be on a B6 mcb (miniature circuit breaker) or split into upstairs on one and downstairs on another. Double check the switches as it may not be the one you originally thought it was

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    Regular Member stuball's Avatar
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    I have switched off and on every breaker including testing the main switch and these 4 lights still don't work. The Unit has 2 marked switchesfor lights. One is upstairs and one is downstairs. I have previously switched off each switch individually to check the labelling and they are definitely correct.

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    Ademusic is right, lighting should be split into upstairs and downstairs, 2 circuits, both on 6 amp MCBs.

    Confusion often comes because hallway lights and landing lights tend to be on the same circuit, despite being on different floors. (I've seen bodged houses, where the landing/hall lights were connected to BOTH circuits! That was fun to sort out!)

    Sounds like your toilet light/fan are on a spur taken off the upstairs lighting circuit. Are you other lights upstairs working?

  7. #7
    Regular Member Ademusic's Avatar
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    Very strange, could be a problem in one of the ceiling roses. If the wiring is dodgy in one it can cause the lights after that in the circuit not to work too

  8. #8
    Regular Member stuball's Avatar
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    @DNS All of the lights upstairs are working.
    @Ademusic Does that mean to you that it would be the rose of the light that was switched on and blew the circuit?

    Thanks so much for the help so far!

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    I think that's an MCB fault ruled out.

    Looks like maybe a loose connection in a ceiling rose.

    Unscrew the landing light fitting and make sure all the wires are nice and tight to the binding posts.

  10. #10
    Regular Member Ademusic's Avatar
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    It "could" have damaged the wiring or caused a wire come loose in the light that blew if the wiring wasn't up to scratch. Basically the lights are on a radial circuit meaning the power comes out of the fusebox up to the first light, then from there to the next light and so on. If the wiring from one ceiling rose comes loose or is damaged then it wouldn't send power to the lights after that in the circuit hense why some lights are working and others on the same circuit aren't. It's highly unlikely that the wiring would burn out or anything as it can take up to a 16A load, so unless there was a major short circuit in the bulb when it blew then the wiring should be okay, and in any case the mcb should trip before the wiring is damaged. It could have caused a wire to come out in the ceiling rose if it wasn't tightened correctly, but I've never come across this. If you are confident with domestic wiring then undo the rose and have a look (With the power off!) but if you're not sure then do get a qualified electrician in. Hope that helps

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