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Thread: Derated value on heaters

  1. #1
    Join Date
    Jan 2008
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    Harrisburg PA
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    Derated value on heaters

    I have a nursing home that my customer wants to replace the existing heater with PTEC heaters. The existing heaters are piped from the boiler. The new PTEC require a 20A 208 single phase circuit with a max amp draw of 16A. Factor the 125% continuous load and that gets me to 20A.

    There are 32 of these going in one wing. There are 2 wings total. I was planning on bringing a panel over into each wing for these. Is there a derated value when calculating the service needed for these?

    I do have my engineer meeting me for a site visit next week but I'd like to figure this out before we meet.

    I was looking in the 2014 NEC and I was wondering if 220.82 (C) (5) applies.

  2. #2
    Join Date
    Jun 2003
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    I’ve been in nursing homes, visiting, and none of the rooms were cool. I would be inclined to let the engineer make the call, in writing, if they want less than full capacity.
    Tom
    TBLO

  3. #3
    Join Date
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    Your code article references a dwelling unit, IMO, it does not apply.

    Look at the definition.
    Tom
    TBLO

  4. #4
    Join Date
    Feb 2003
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    Quote Originally Posted by horrorsix View Post
    I was looking in the 2014 NEC and I was wondering if 220.82 (C) (5) applies.
    220.82(C)(5) would not apply. 220.82 applies to a single dwelling unit...(are the nursing home units "dwelling units" in your case?)

    You want to look at 220.51 Exception. You could get permission from the AHJ for a lower than 100% feeder.

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