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Dimmers silent but distribution box buzzes!

Discussion in 'Smart Home, Climate Control & Security Forum' started by spiritburner, Sep 15, 2005.

  1. spiritburner

    spiritburner
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    I've just had the downstairs rewired with new lighting.

    In the living room I've got 10 halogen 240v 50w GU10 downlighters & 2 50w tunsten wall lights running off a 2 gang 2 way 400w dimmer & in the kichen/diner I've got 2 clusters of 4 halogen 240v 50w Gu10 lights also running from the same spec dimmer.

    The dimmers are silent but if any of the halogon circuits are on the distribution box buzzes! :(

    I'm not up on sparky speak but I'm guessing that the dimmers may be under-rated? Could I be stuck here as I can't find any 2 gang 2 way 1000w dimmers listed anywhere?

    :lease:

    Thanks,
    Ross
     
  2. ZippyCat

    ZippyCat
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    Could you clarify whether the living room and kitchen / diner are 2-wayed together, i.e. are all areas controlled from the same switched circuit.

    Generally you can only connect 250W of halogen lighting to a 400W dimmer. Lets presume the living room is isolated, and the lights are equally split i.e. 5 spots and 1 wall light on each gang, you will be running at 6x50W = 300W.

    If you cannot source a suitably rated dimmer, have you thought about two 500W dimmers adjacent to each other?
     
  3. spiritburner

    spiritburner
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    Hi ZippyCat,

    Thanks for yor reply.

    Excuse my ignorance of the subject but I will try & clarify as best I can.

    In the living room the 10 halogens are on a 2 way with a dimmer & normal rocker switch. The normal wall lights are 1 way but on the same 2 gang dimmer as the halogens.

    In the kitchen there are 2 one way clusters with 4 halogens on each controlled from the same 2 gang dimmer.

    Since I posted I've been directed to a site that supplies the 1000w 2 gang 2 way dimmers (at a cost!) & the info there confirms your advice -

    "If using standard dimmers for mains voltage Halogen lamps the maximum load should be reduced by 25 - 30% ie a 400w dimmer should only be used for a 250w Halogen load."

    This would indicate the living room dimmer is way overloaded but I'm confused by the problem occuring in the kitchen. Each dimmer on the 2 gang is only switching 200w so is the 400w split between each dimmer on the 2 gang ie 200w per dimmer? Given the need for 35-30% load reduction I'm guessing it is.

    Cheers,
    Ross
     
  4. ZippyCat

    ZippyCat
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    It’s a little difficult to identify the cause of the buzzing without seeing the installation, you would be better off getting a spark in assess the problem. At the end of the day if something is fundamentally wrong, it’s your home and family’s lives that are potentially at risk from a faulty installation, something not worth risking. Sorry I couldn’t be of any further help.

    Regards

    ZippyCat
     
  5. Johnny Thunder

    Johnny Thunder
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    Without actually inspecting and testing the installation,
    it sounds like a loose connection in your consumer unit.
    There should be no buzzing coming from there.

    Johnny.
     

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