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Thread: EGC or GEC?

  1. #1
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    EGC or GEC?

    The ground wire from a service switchboard to the main building ground bar is an equipment grounding conductor, correct?

  2. #2
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    Quote Originally Posted by Jennifer K. View Post
    The ground wire from a service switchboard to the main building ground bar is an equipment grounding conductor, correct?
    Could be several things.

    EGC. Bonding jumper of some kind. Might even be a GEC.

    Is the switchboard really the service point?

    I don't know what you mean by main building ground bar.
    Bob

  3. #3
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    Quote Originally Posted by Jennifer K. View Post
    The ground wire from a service switchboard to the main building ground bar is an equipment grounding conductor, correct?
    GEC.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  4. #4
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    Most of my designs place the N-G bond inside the service switchboard. A ground wire from the neutral bar in the direction of planet Earth (via the bus bar on the electric room wall) is a GEC.
    Charles E. Beck, P.E., Seattle
    Comments based on 2017 NEC unless otherwise noted.

  5. #5
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    From Mike Holt "What color is it and what does it do?"
    Most call it a ground which means nothing.
    Moderator-Washington State
    Ancora Imparo

  6. #6
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    Quote Originally Posted by Jennifer K. View Post
    The ground wire from a service switchboard to the main building ground bar is an equipment grounding conductor, correct?
    More details on what this "main building ground bar" is critical to the answer.

    If it is a place for multiple services to tie together and then connect the grounding electrode system to it - each connection to each service is a bonding jumper I would think.

    If it is a place for other systems to be able to connect grounding/bonding conductors to - I'd still say it is a bonding jumper but doesn't necessarily need to be sized the same way as the other condition I mentioned.
    I live for today, I'm just a day behind.

  7. #7
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    Quote Originally Posted by kwired View Post
    If it is a place for multiple services to tie together and then connect the grounding electrode system to it - each connection to each service is a bonding jumper I would think.
    250.30(A)(6) calls it a grounding electrode conductor tap.
    Bob

  8. #8
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    Quote Originally Posted by petersonra View Post
    250.30(A)(6) calls it a grounding electrode conductor tap.
    Ok thanks. I was aware of what that section allows, but did not look to see if they gave a name to such a conductor. Sort of a name that only applies to that section and not a name that applies to the NEC in general or even art 250 in general - or it would probably be in art 100 or 250.2.
    I live for today, I'm just a day behind.

  9. #9
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    Quote Originally Posted by Jennifer K. View Post
    The ground wire from a service switchboard to the main building ground bar is an equipment grounding conductor, correct?
    Where is the MBJ?

    ~RJ~

  10. #10
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    Quote Originally Posted by Jennifer K. View Post
    The ground wire from a service switchboard to the main building ground bar is an equipment grounding conductor, correct?

    The building ground bar is an extension of the grounding electrode system therefore an external grounding conductor form the switchboard is most likely the GEC.

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