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Thread: Power Circuit and Control Circuit in same Junction Box in Industrial Environment

  1. #1
    Join Date
    Sep 2017
    Location
    Charlotte, NC
    Posts
    2

    Power Circuit and Control Circuit in same Junction Box in Industrial Environment

    Hey I'm new to this forum.
    I know this question been asked many times.
    Here is some information, my question is ask in regard of Industrial Machinery Environment.
    I have a junction box mounts on a Hydraulic Power Unit and planning on running 460VAC motor power circuit and 24VDC control circuit to this single junction box.
    it's a 3hp motor and all wiring and protection method are following the guideline of Article 430.
    I like to get a clarification on all requirement needed to run these 2 voltages in the some JUNCTION BOX.

    I did some research and was reference to 725.130 reclassify class 2 and 3 circuit as class 1 as following the wiring method
    Also Article 800.133 exception to maintain 0.25 inch or using barrier.
    What exactly i should do to suffice the code requirement in Industrial environment.

    thank you

  2. #2
    Join Date
    Sep 2017
    Location
    Charlotte, NC
    Posts
    2
    Article 300.3 (C)(1) also mentioned
    Conductors of ac and dc circuits, rated 1000V or less shall be permitted to occupy the same equipment wiring enclosure, cable or raceway. all conductors shall have an insulation rating equal to at least the max circuit voltage applied to any conductor within the enclosure, cable, or raceway.

    Now i'm kind of confused when is what applied?....

    thank you,

  3. #3
    Join Date
    Dec 2012
    Location
    Placerville, CA, USA
    Posts
    17,960
    Quote Originally Posted by YuuCrz View Post
    Article 300.3 (C)(1) also mentioned
    Conductors of ac and dc circuits, rated 1000V or less shall be permitted to occupy the same equipment wiring enclosure, cable or raceway. all conductors shall have an insulation rating equal to at least the max circuit voltage applied to any conductor within the enclosure, cable, or raceway.

    Now i'm kind of confused when is what applied?....

    thank you,
    There is a qualitative difference between wires, possibly spliced, only and terminations to a device within the box.
    There are also separate requirements for DC conductors that are part of a PV installation.
    And different requirements for Low Power wires (Class 1, 2, and 3)
    And different, more restrictive, requirements for Data and Communication too.

    The general rule is that the rule for a more specific situation overrides the general rule unless otherwise stated.

  4. #4
    Join Date
    Feb 2003
    Location
    Illinois
    Posts
    23,197
    Quote Originally Posted by YuuCrz View Post
    Article 300.3 (C)(1) also mentioned
    Conductors of ac and dc circuits, rated 1000V or less shall be permitted to occupy the same equipment wiring enclosure, cable or raceway. all conductors shall have an insulation rating equal to at least the max circuit voltage applied to any conductor within the enclosure, cable, or raceway.

    Now i'm kind of confused when is what applied?....

    thank you,
    When you read that section you need to make sure that you read the Informational Note that follows that section. The control system may be a Class 2 or 3 system and the rules in Article 725 would apply in that case.
    Don, Illinois
    The code only applies to T&M work....it does not apply to contract work.

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