Page 2 of 2 FirstFirst 12
Results 11 to 15 of 15

Thread: using load diversity for derating

  1. #11
    Join Date
    Jan 2009
    Location
    3 Hr 2 Min from Winged Horses
    Posts
    14,007
    Quote Originally Posted by electrofelon View Post
    Yeah so that is what I don't quite get: where in the code is the authority granted, even if I'm an EE, to consider diversity? 310.15 (C) discusses engineering supervision, but doesn't appear to have allowance for diversity. Diversity is only mentioned in an informational note, which references something that isn't part of the code :
    You just had to look didn’t you.......
    "Electricity is really just organized lightning." George Carlin


    Derek

  2. #12
    Join Date
    Jun 2004
    Location
    Cherry Valley NY, Seattle, WA
    Posts
    3,774
    Quote Originally Posted by jumper View Post
    You just had to look didn’t you.......
    I'll propose a code change: after the informational note mentioning the table in annex B for diversity, I will add another informational note saying "do not look at annex B" or "annex B is not part of this code, don't bother looking"
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

  3. #13
    Join Date
    Jan 2009
    Location
    3 Hr 2 Min from Winged Horses
    Posts
    14,007
    Quote Originally Posted by electrofelon View Post
    I'll propose a code change: after the informational note mentioning the table in annex B for diversity, I will add another informational note saying "do not look at annex B" or "annex B is not part of this code, don't bother looking"
    Every sparky who pokes around into Annex B comes out unhappy and a bit confused.

    I did once, I still have the scars.
    "Electricity is really just organized lightning." George Carlin


    Derek

  4. #14
    Join Date
    Apr 2007
    Location
    Berkeley, CA
    Posts
    1,514
    Quote Originally Posted by charlie b View Post
    The term “diversity factor” is defined as X divided by Y. It is necessarily greater than or equal to 1.0. The NEC Annex B table speaks of a load diversity of 50%. So it cannot be talking about this concept.
    So maybe it is talking about Y / X?

    Cheers, Wayne

  5. #15
    Join Date
    Jan 2009
    Location
    3 Hr 2 Min from Winged Horses
    Posts
    14,007
    Quote Originally Posted by wwhitney View Post
    So maybe it is talking about Y / X?

    Cheers, Wayne
    Page 1 gets into it a little bit in this link.

    http://static.schneider-electric.us/...tion3_0307.pdf
    "Electricity is really just organized lightning." George Carlin


    Derek

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •