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Replacing 3 gang dimmer with standard switch

Discussion in 'Electrics UK' started by BritishBeef, 25 Jul 2015.

  1. BritishBeef

    BritishBeef

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    Hi all.
    I have recently had my kitchen moved downstairs (I live in a townhouse) and have mains voltage LED downlights. I bought a Varilight IR V-Pro Trailing Edge dimmer and my Electrician fitted it yesterday. It worked fine for a few hours but now is going haywire and randomly turning on and off by itself!
    Looks like it's faulty but I need lights working in my kitchen now!

    So I have bought a standard 3 gang switch just to get the lights working for now.
    However, after looking at the wiring on my new dimmer and looking at the back of my new switch I'm left confused as to what wires go where. I have successfully wired new switches in the past but have not gone from a dimmer like this to a standard switch.

    Here's a photo of the wired up dimmer switch as it is now:

    [​IMG]
    Not sure if it's clear in the above photo but there is also a grey wire with blue tape on it not connected to anything.

    Here's the rear of the standard switch I want to install instead:

    [​IMG]

    If any of you can help me wire this I would be eternally grateful :)
     
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  3. EFLImpudence

    EFLImpudence

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    You will note that the new switch has two lines which divide it into three switches.
     
    Last edited: 25 Jul 2015
  4. riveralt

    riveralt

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    Just swap your live and load from the dimmer to Com and L1 for each switch respectively.
     
    Last edited: 25 Jul 2015
  5. PrenticeBoyofDerry

    PrenticeBoyofDerry

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    As above note the way the new plastic switch is divided into three section one for each gang (com L1 L2 x 3) one section is upside down.
    Looking at your picture of the existing dimmer switch, you have 3 perm Lives (1 brown and two red) they are terminated at the com of each gang. Then you have 3 switch lives (black brown sleeve?, black sleeved red, black sleeved yellow), these are then terminated at the L1 terminal of each associated gang.
    So
    Gang 1 Brown to com with black sleeved browm at L1
    Gang 2 Red to com with black sleeved mostly red at L1
    Gang 3 Red to com with black sleeved mosty yellow at L1
    Terminate all the CPCs (earths) to the earth terminal on the backbox
    The grey is left as it is.
    The first black looks like it may have a brown sleeve on, I maybe wrong?
     
    Last edited: 25 Jul 2015
  6. Taylortwocities

    Taylortwocities

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    What he said^^^^

    Re your LED lamps, are they dimmer-able?
    Are all circuits going "haywire" or just one?
     
  7. BritishBeef

    BritishBeef

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    Thanks very much everyone. Works a charm :)
     
  8. BritishBeef

    BritishBeef

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    The lamps are dimmable yes. It's mainly one of the gangs but the other is doing it too just a lot less frequently. The 3rd gang is conected to a standard light fitting which hasn't got a bulb in so can't test it.
     
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  10. ban-all-sheds

    ban-all-sheds

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    The lights may be dimmable, but do they meet the minimum load requirements of the dimmer?
     
  11. riveralt

    riveralt

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    If you have more than the minimum size load and compatible bulbs then it sounds like the dimmer hasn't been set up properly. Assuming the firmware is 10B or later (the firmware is usually on a sticker on the side of the dimmer module) check the instructions they will show you how to change the mode setting for the problems you are encountering.
     
  12. phatboy

    phatboy

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    It may be an illusion, but the Varilight plate looks like 2G, and the plastic one looks like 1G, so is there a big space at one side when you fit it?
     
  13. riveralt

    riveralt

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    It is no illusion, but the OP did state
     
  14. phatboy

    phatboy

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    Appreciate it was done in a hurry, but it's not very safe unless some other precaution is taken?

    Standard 3gang doesn't automatically mean a 1g plate though does it?
     
  15. BritishBeef

    BritishBeef

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    Yes it's not ideal. There is a gap of course but I've tucked all cables behind plate and duck taped over the gap for now. I'm going to buy a 3 gang switch to fit existing back box. There are some available online.
     
  16. DIYnot Local

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