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  1. #1
    Join Date
    Mar 2011
    Posts
    2

    Exclamation Low voltage transformer issue

    Hello,
    I am hoping someone with some good knowledge of low voltage lighting can help me out. My basement lights (in the finished part) consist of four 50w halogens wired to a 250w (WAC) transformer. This system has yielded years of trouble-free service. A few months ago, one of the bulbs burned out and I (mistakenly) replaced it with a 35w bulb (so now we have three 50w bulbs and one 35w bulb being powered by the 250w transformer). This worked fine for a few months until recently. Now there is no light at all and no humming from the transformer when turned on. Question: did the one incorrect wattage (35) bulb cause the problem or was it just time for the transformer to give up the ghost?
    Thanks for your help.

    Regards,
    Bob

  2. #2
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Low voltage transformer issue

    Quote Originally Posted by VanGale View Post
    Hello,
    I am hoping someone with some good knowledge of low voltage lighting can help me out. My basement lights (in the finished part) consist of four 50w halogens wired to a 250w (WAC) transformer. This system has yielded years of trouble-free service. A few months ago, one of the bulbs burned out and I (mistakenly) replaced it with a 35w bulb (so now we have three 50w bulbs and one 35w bulb being powered by the 250w transformer). This worked fine for a few months until recently. Now there is no light at all and no humming from the transformer when turned on. Question: did the one incorrect wattage (35) bulb cause the problem or was it just time for the transformer to give up the ghost?
    Thanks for your help.

    Regards,
    Bob
    4 x 50 watt = 200 watts
    A 250 watt transformer with 200 watts draw = 80% of capacity

    3 x 50 = 150 watts plus 35 watts = 185 watts = 74% of capacity

    Using the 35 watt bulb wouldn't cause any harm to the transformer . If anything it would have been helpful since it would have reduced the overall current draw through the transformer.


    If there is no issue with 120volts supply to the transformer and there is no voltage output from the transformer ( providing there no blown inline fuse ) -- it was time the transformer gave up the ghost.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  3. #3
    Join Date
    Feb 2011
    Location
    Brown county, Ohio
    Posts
    52

    Default Re: Low voltage transformer issue

    I would say that a 35 w bulb would do nothing to harm the transformer, it would actually run cooler. Asuming you have power to it i would say that time and heat has gotten to it and it is time to replace it. GOOD LUCK AND BE SAFE

  4. #4
    Join Date
    Mar 2011
    Posts
    2

    Default Re: Low voltage transformer issue

    Thanks Edgeking & Canuk! I am glad to hear that this was not caused by my ignorance!

    Cheers,
    Bob

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