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Thread: Service disconnect interconnection questions

  1. #1
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    Service disconnect interconnection questions

    Attached is system grounding detail. Does anyone see any violation of code with the attached drawing?
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  2. #2
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    What do you see as a potential violation?
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

  3. #3
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    If you are referring to the GEC connected to the ground bar, then no violation.
    250.24(A)(4) allows it.

    (4) Main Bonding Jumper asWire or Busbar. Where the
    main bonding jumper specified in 250.28 is a wire or busbar
    and is installed from the grounded conductor terminal
    bar or bus to the equipment grounding terminal bar or bus
    in the service equipment, the grounding electrode conductor
    shall be permitted to be connected to the equipment
    grounding terminal, bar, or bus to which the main bonding
    jumper is connected.
    If you aim at nothing, you will hit it every time!

  4. #4
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    Following I am not sure about in the diagram or violate the code:

    1. There is main bonding jumper from netural to gnd bar then their is also path from netural bar to conduit and conduit to enclosure and enclosure to gnd bar thru bonding jumpers creating second main bonding jumper.

    2. The enclosure is bonded from neutral bar to enclosure and also thru neutral bar to conduit and from conduit to enclosure thru bonding jumpers creating two paths.

  5. #5
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    Quote Originally Posted by codequestion View Post
    Following I am not sure about in the diagram or violate the code:

    1. There is main bonding jumper from netural to gnd bar then their is also path from netural bar to conduit and conduit to enclosure and enclosure to gnd bar thru bonding jumpers creating second main bonding jumper.

    2. The enclosure is bonded from neutral bar to enclosure and also thru neutral bar to conduit and from conduit to enclosure thru bonding jumpers creating two paths.
    All metal parts (enclosures, metal raceways, etc.) on the line side of the service disconnect are bonded together and connected to the neutral conductor. This will often create parallel paths for the neutral current, in this scenario it is permitted by the NEC.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  6. #6
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    I see too many jumpers. I would bond conduits to the neutral bar and then install one Main Bonding Jumper from neutral to the ground bar. Size it per article 250.66

  7. #7
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    Quote Originally Posted by Bob V View Post
    I see too many jumpers. I would bond conduits to the neutral bar and then install one Main Bonding Jumper from neutral to the ground bar. Size it per article 250.66
    Would too many make it a violation?
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

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