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Thread: 312.8 Changes

  1. #1
    Join Date
    Aug 2008
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    Maryland
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    Default 312.8 Changes

    Notice the difference between the wording. This is the 05.

    312.8 Enclosures for Switches or Overcurrent Devices.
    Enclosures for switches or overcurrent devices shall not be
    used as junction boxes, auxiliary gutters, or raceways for
    conductors feeding through or tapping off to other switches
    or overcurrent devices, unless adequate space for this purpose
    is provided. The conductors shall not
    fill the wiring
    space at any cross section to more than 40 percent of the
    cross-sectional area of the space, and the conductors,
    splices, and taps shall not
    fill the wiring space at any cross
    section to more than 75 percent of the cross-sectional area

    of that space.

    Here is the 2011 Draft.
    312.8 Switch and Overcurrent Device Enclosures with
    Splices, Taps, and Feed-Through Conductors.
    The wiring
    space of enclosures for switches or overcurrent devices
    shall be permitted for conductors feeding through, spliced,
    or tapping off to other enclosures, switches, or overcurrent
    devices where all of the following conditions are met:
    (1) The total of all conductors installed at any cross section
    of the wiring space does not exceed 40 percent of the
    cross-sectional area of that space.
    (2) The total area of all conductors, splices, and taps installed
    at any cross section of the wiring space does not
    exceed 75 percent of the cross-sectional area of that
    space.
    (3) A warning label is applied to the enclosure that identifies
    the closest disconnecting means for any feedthrough

    conductors.
    [ROP 9-34]

    Hopefully this clears things up.


    Inspection Referral SOC
    All answers based on unamended National Electrical codes.

  2. #2
    Join Date
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    Default Re: 312.8 Changes

    And the actual wording from the 2011 NEC is the same as the ROP that Jim posted:

    312.8 Switch and Overcurrent Device Enclosures with

    Splices, Taps, and Feed-Through Conductors.
    The wiring
    space of enclosures for switches or overcurrent devices
    shall be permitted for conductors feeding through, spliced,
    or tapping off to other enclosures, switches, or overcurrent
    devices where all of the following conditions are met:
    (1) The total of all conductors installed at any cross section
    of the wiring space does not exceed 40 percent of the
    cross-sectional area of that space.
    (2) The total area of all conductors, splices, and taps installed
    at any cross section of the wiring space does not
    exceed 75 percent of the cross-sectional area of that
    space.
    (3) A warning label is applied to the enclosure that identifies
    the closest disconnecting means for any feedthrough
    conductors.




  3. #3
    Join Date
    Aug 2008
    Location
    Maryland
    Posts
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    Default Re: 312.8 Changes

    Thanks for the confirmation Ken. Looks like all that stuff about needing the space identified somehow has been clarified and was not the intent of the CMPs.

    All answers based on unamended National Electrical codes.

  4. #4
    Join Date
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    Default Re: 312.8 Changes

    Quote Originally Posted by Jim Port View Post
    Thanks for the confirmation Ken. Looks like all that stuff about needing the space identified somehow has been clarified and was not the intent of the CMPs.
    yes sir - you are correct


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