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Ground Loop Conductor Size

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    Ground Loop Conductor Size

    Greetings,

    I have an electrical room that the owner wants to have a ground loop around that electrical room. The service size 3000 A. I was wondering if there is a requirement in NEC or other applicable codes that determine the size of the conductor. Per NEC 250.66 the grounding electrode conductor size is 3/0 but does not talk about a ground loop conductor size. Please advise.

    My second question is the tap conductor size to bond building, switchboard and other gear inside the room, I can still use 250.66 and select 3/0.

    Thanks

    #2
    Take a look at 250.64(D). Does your installation sound like a design utilizing a common grounding electrode?
    Rob

    Moderator

    All responses based on the 2017 NEC unless otherwise noted

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      #3
      Originally posted by infinity View Post
      Take a look at 250.64(D). Does your installation sound like a design utilizing a common grounding electrode?
      I have multiple grounding electrodes one in each corner of the building.

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        #4
        IMO, you can make it any size you want. You have already met the minimum code requirements.

        IMO what you are describing is an equipment grounding conductor that should be sized according to 250.122, not a grounding electrode conductor sized according to 250.66 if you need some code to back up your design decisions.
        Bob

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          #5
          Originally posted by petersonra View Post
          IMO, you can make it any size you want. You have already met the minimum code requirements.-Thanks

          IMO what you are describing is an equipment grounding conductor that should be sized according to 250.122, not a grounding electrode conductor sized according to 250.66 if you need some code to back up your design decisions.
          I think you are correct.

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            #6
            Typically, I have see these as a copper bar that encompasses the entire inner perimeter of the building.

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