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    Ground Ring Question

    250.52(A)(4) uses the word "encircling" does that mean the ring HAS to "encircle" the building or just has to have 20ft of an attempt to go around the building.

    #2
    IMHO, yes, the conductor must go all the way around the building or structure.

    Pete
    Experience is something thats gained shortly after you really needed it.

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      #3
      Originally posted by pete m. View Post
      IMHO, yes, the conductor must go all the way around the building or structure.

      Pete
      I agree otherwise it wouldn't be a loop. A cee only requires 20'
      They say I shot a man named Gray and took his wife to Italy
      She inherited a million bucks and when she died it came to me
      I can't help it if I'm lucky

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        #4
        Ditto the above answers and here's 5 more opinions
        http://www.google.com/search?client=...UTF-8&oe=UTF-8

        While we're on the subject, and I can't say either way, but
        . . .does or did an NEC definition ever flatly contradict the 'common meaning' of a word?
        Last edited by G._S._Ohm; 03-02-11, 12:41 PM.

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          #5
          While there is no technical reason why the ground ring has to encircle a building or structure, that is what the code requires. 20' of #4 copper run in a straight line would be just as effective, if not more effective, than that same 20' of #4 run in a circle.
          Don, Illinois
          (All code citations are 2017 unless otherwise noted)

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            #6
            I thought a ground ring gives you a two dimensional version of a
            http://en.wikipedia.org/wiki/Faraday_cage
            and you don't need 3 dimensions because 60 Hz ground currents don't radiate through the air very well - the wavelength is too long.

            I'll look for some links that give evidence either way.
            Last edited by G._S._Ohm; 03-02-11, 07:56 PM.

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