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Thread: Ambient Temperature Correction factors

  1. #1
    Join Date
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    Ambient Temperature Correction factors

    I am running conductors in conduit outdoors (not underground) and would like to apply the ambient temperature correction factors in Table 310.15(B)(2)(a). Problem is the NEC doesn't specifically state HOW the ambient temperature is found. Any suggestions? Any tables or websites I could use?

  2. #2
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    310.15(B)(3)(5) Informational Note:

    Informational Note: One source for the ambient temperatures
    in various locations is the ASHRAE Handbook — Fundamentals.

  3. #3
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    I've heard a few different interpretations, one says that you use the yearly average temperature.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  4. #4
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    Quote Originally Posted by Mouser View Post
    310.15(B)(3)(5) Informational Note:

    Informational Note: One source for the ambient temperatures
    in various locations is the ASHRAE Handbook — Fundamentals.
    Just as you responded I found this info in the ASHRAE handbook. Thanks!

  5. #5
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    Quote Originally Posted by minesh21 View Post
    Just as you responded I found this info in the ASHRAE handbook. Thanks!
    You can also go here: http://www.solarabcs.org/about/publi...map/index.html

  6. #6
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    Quote Originally Posted by ggunn View Post
    Woah this is perfect. Thanks!

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