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Thread: Balancing conductors

  1. #1
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    Balancing conductors

    Is it code when you have parallel feeders to keep
    each conduit with a,b,c nuetral in each conduit .

    and if so does this rule apply when nippling
    panels together .

    i ask this bc I'm cutting in panels that are nippled
    together with 3 nipples .

    the wire is 600 so in order to make it look nice
    idd like to have all the nuetrals in one nipple
    and switch up the phases .

    So so it's not abc ,n in each nipple .

  2. #2
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    Section 310.4 provides specific information and requirements for paralleling of conductors and should certainly be the first reference that a user would choose for an understanding of the basics for paralleling conductors.
    Each phase and each neutral or grounded conductor must be present within each separate raceway, auxiliary gutter, cable tray, cable bus assembly, cable or cord. For example, in an installation where three sets of 3/0 AWG conductors are paralleled for each phase and the neutral of a three-phase, four-wire system, there will be one 3/0 AWG for Phase A, one for Phase B, one for Phase C, and one for the neutral in each of three raceways.
    There is an exception to this general rule located in 300.3(B)(1) that permits conductors installed in nonmetallic raceways run underground to be arranged as isolated phase installations with all of one phase in one conduit, all of another phase in another conduit, all of the final phase in one conduit, with all of the neutrals in the final conduit.

    http://www.ecmag.com/section/systems...ected-parallel

  3. #3
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    So the the only exception is when conduits are buried

    I was hoping gheir would be an exception with nipples

  4. #4
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    Putting each phase into a separate conduit creates problems with strong magnetic forces. If you are using metal conduit, the magnetic waves will heat the conduit. Putting all phases in each conduit causes the magnetic forces to cancel each other out.

  5. #5
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    Quote Originally Posted by Coppersmith View Post
    Putting each phase into a separate conduit creates problems with strong magnetic forces. If you are using metal conduit, the magnetic waves will heat the conduit. Putting all phases in each conduit causes the magnetic forces to cancel each other out.
    Ok got you thank you for your reply.

    i cut one in yesterday theirs two nipples

    panel one and panel two .

    panel two has feed through lugs on it feeding panel
    two .

    so I did abc and two nuetrals in one nipple

    and abc in the second nipple , I order to cut in the nuetrals
    making it look nice I didn't have a lot of room how it was nippled.

  6. #6
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    Quote Originally Posted by liquidtite View Post
    Ok got you thank you for your reply.

    i cut one in yesterday theirs two nipples

    panel one and panel two .

    panel two has feed through lugs on it feeding panel
    two .

    so I did abc and two nuetrals in one nipple

    and abc in the second nipple , I order to cut in the nuetrals
    making it look nice I didn't have a lot of room how it was nippled.
    If you have any line to neutral loads, there can still be unbalanced current with both neutrals in the same nipple. Maybe not a serious heating problem, but is definitely a technical violation of the Code that an inspector could tag you for.

  7. #7
    Quote Originally Posted by liquidtite View Post
    Ok got you thank you for your reply.

    i cut one in yesterday theirs two nipples

    panel one and panel two .

    panel two has feed through lugs on it feeding panel
    two .

    so I did abc and two nuetrals in one nipple

    and abc in the second nipple , I order to cut in the nuetrals
    making it look nice I didn't have a lot of room how it was nippled.
    You need to move the neutral to be with is feeders or you will cause issues in the future.

    Sent from my SM-N900V using Tapatalk

  8. #8
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    How long are the nipples? If the panels are next to each other then I would just cut in a window or instead of nipples I would use a wireway between the two then you can orient the conductors anyway you want.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  9. #9
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    One of the best panel connecting methods I've found uses Carlon Terminal Adapters & couplings,

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    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.

  10. #10
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    Quote Originally Posted by augie47 View Post
    One of the best panel connecting methods I've found uses Carlon Terminal Adapters & couplings,

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    That method doesn't "self bond" the two enclosures together in any way at all

    I do agree with the suggestion of "window" between enclosures butted against one another or a wireway between enclosures if you can't get a large enough raceway to fit.

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