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Transformer Question

Discussion in 'Electrical Engineering' started by Richard & Elise, Oct 30, 2006.

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  1. I have a 45KVA 480-208y/120 volt transformer with a 15 degree rise. I
    understand you can overload transformers. What does the NEC allow for the
    secondary side load on a 45 KVA transformer?

    Can you feed a 200Amp 208Y/120 volt panel from this?
  2. Ben Miller

    Ben Miller Guest

    The full load rating of the transformer is 125A. The NEC allows secondary
    protection at 125% of rating, or 156A. SInce it is over 150, you are allowed
    to go to the next higher standard rating, which is 175A.

    You need to determine if this would adequately serve the panel loads. You
    also need to verify proper protection of the wiring, transformer life, and
    any other factors that you may not have mentioned in your post.

    Ben Miller
  3. Thanks for the information! It was very helpfull and confirmed what I
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