Page 1 of 4 123 ... LastLast
Results 1 to 10 of 32

Thread: Maxium conduit run between pull boxes, NEC Code

  1. #1
    Join Date
    Oct 2007
    Posts
    5

    Maxium conduit run between pull boxes, NEC Code

    Could anyone tell me what is the maximum conduit run (length) between pull boxes per NEC code? And what page of the NEC code book its on? I have the 2002 version of the NEC code book.

  2. #2
    Join Date
    May 2003
    Location
    Salt Lake City, Utah
    Posts
    5,319
    There is no code requirement for this, contrary to popular belief.
    Ryan Jackson, Salt Lake City
    Inspector, Instructor

  3. #3
    Join Date
    Feb 2003
    Location
    N.C.
    Posts
    15,177
    There is no maximum length, if you have a means to get a rope or pulling means from one end to the other the length of the rope or pulling means is the only limit.

    The issue is not having more than 360 deg of bend between pull points, see any of the conduit articles, 3xx.26

    Roger
    Moderator

  4. #4
    Join Date
    Aug 2006
    Location
    Cape Cod, Massachusetts
    Posts
    631
    I asked that same question about a year ago. Someone asked me that question at work

  5. #5
    Join Date
    Feb 2003
    Location
    Illinois
    Posts
    19,135
    There is also a limit based on the pulling calculations. It does no good to pull on the conductor with so much force that it breaks, or that you crush the inslulation as a result of excessive sidewall pressure when pulling around bends.
    Don
    Don, Illinois
    "It is the first responsibility of every citizen to question authority." B Franklin

  6. #6
    Join Date
    May 2007
    Location
    Fort Lauderdale/ Miami
    Posts
    1,639
    For some reason I thought it was 500'.

  7. #7
    Join Date
    Feb 2005
    Location
    NJ
    Posts
    9,324
    Quote Originally Posted by jrannis
    For some reason I thought it was 500'.
    If you can produce a code article to support what you think, then we will all know what you thought :smile:
    ĦĦĦĦĦĦĦĦĦĦĦĦ
    ««« CELTIC »»»
    ĦĦĦĦĦĦĦĦĦĦĦĦ
    An error on your part does not constitute an emergency on my part.8-)


  8. #8
    Join Date
    Jan 2004
    Location
    Right here.
    Posts
    12,326
    Functionally, pulling tension calcs and number of bends aside, the limit is often based on several more practical factors:
    • length of the pull rope to be used
    • amount of space available to payoff the conductors
    • amount of space available to re-reel or stack conductors at the next pull point
    • amount of labor available to make the pull
    • amount and type of equipment available to make the pull

  9. #9
    Join Date
    Apr 2004
    Location
    Back in Alaska, on a "Jack Bauer" job!
    Posts
    1,708
    Air compressor - High CFM? Check.

    Bucket of Jetline? Check.

    "Stand clear the gear!"

    DISTANCE UNLIMITED!
    Don't let fear be your guide!

  10. #10
    Join Date
    Mar 2003
    Location
    New England
    Posts
    10,428
    Quote Originally Posted by don_resqcapt19
    There is also a limit based on the pulling calculations. It does no good to pull on the conductor with so much force that it breaks, or that you crush the inslulation as a result of excessive sidewall pressure when pulling around bends.
    Don
    Mention pulling calculations to the average field electrician, and even the above average electrician, and you will most likely get the "deer in the headlights" response. I'm not saying it's right, but there is widespread ignorance of their importance. When it comes right down to it, the mentality of pulling seems to be "Get er done!"

    I had no clue about them before I came here, and then I realized I was probably involved in a few pulls that were...shall we say....a bit over the line of sidewall pressure.

Posting Permissions

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