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Thread: 75 KVA Transformer/ Suspended Ceiling

  1. #1
    Join Date
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    75 KVA Transformer/ Suspended Ceiling

    Q4. What are the requirements in locating transformers above a suspended ceiling?
    A4. Dry-type transformers, rated not more than 50 kVA, are permitted above suspended ceilings or in hollow spaces of buildings, if not permanently closed in by the structure [450.13(B)]. Dry-type transformers not exceeding 50 kVA with a metal enclosure can be installed above a suspended ceiling space used for environmental air-handling purposes [300.22(C)(2)].

    Per the question and answer newsletter; It appears from the answer that a 75KVA transformer cannot be installed above a suspended celing. 450.13 B says permanently closed in by structure. The removeable ceiling tiles are accessible or are they permanent So is a transformer allowed to be installed above a suspended ceiling

  2. #2
    Join Date
    Feb 2009
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    long island, ny
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    In NYC I have put a 75 KVA above a drop ceiling.

  3. #3
    Quote Originally Posted by nyhockey View Post
    In NYC I have put a 75 KVA above a drop ceiling.


    Just because you have done it.\, doesn't make it right.
    The transformer is too big by 25 kva to go above a dropped ceiling.

  4. #4
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    All jobs were inspected.

  5. #5
    Quote Originally Posted by nyhockey View Post
    All jobs were inspected.
    that means nothing

  6. #6
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    To me, 450.13 could be a bit clearer, but it appears it appears that unless they are in the open or 50kva or less, they must be readily accessible
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

  7. #7
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    Quote Originally Posted by mcclary's electrical View Post
    that means nothing
    WOW! Do the inspectors down their know that.

  8. #8
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    Since I am one, I guess so.
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

  9. #9
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    Just because it was "Inspected" doesn't mean it's compliant.

  10. #10
    Join Date
    May 2003
    Posts
    3,422
    it may be an amendment in NYC...they allow things due to space constraints...but in NJ it is a no go....as per the NEC

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