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Bonding Rebars in Building Addition

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    Bonding Rebars in Building Addition

    Hello all, I have a commercial building addition where the original building already has a concrete encased electrode, the engineer wanted another concrete encased electrode on the addition, I showed him 250.52 (A)(3) and he gave up on that, but now he wants me to tie the rebars together from the existing building and the addition. I don't think he is right but I cannot find a code reference other than 250.52 that says otherwise. Your Help is much appreciated.

    #2
    Originally posted by dmanda24 View Post
    Hello all, I have a commercial building addition where the original building already has a concrete encased electrode, the engineer wanted another concrete encased electrode on the addition, I showed him 250.52 (A)(3) and he gave up on that, but now he wants me to tie the rebars together from the existing building and the addition. I don't think he is right but I cannot find a code reference other than 250.52 that says otherwise. Your Help is much appreciated.
    NEC does not require it. He may have reasons to do so, it is his design.
    I live for today, I'm just a day behind.

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      #3
      Originally posted by kwired View Post
      NEC does not require it. He may have reasons to do so, it is his design.
      His reason is that he thinks it is required, we are both trying to minimize cost to owner on an already over budget project, if I show him is not required he will not require it.

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        #4
        Originally posted by dmanda24 View Post
        His reason is that he thinks it is required, we are both trying to minimize cost to owner on an already over budget project, if I show him is not required he will not require it.
        Last sentence of 250.52(A)(3)
        I live for today, I'm just a day behind.

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          #5
          As Kwired stated it's not required. Although it was never required the section he quoted was added several code cycles ago to avoid any confusion.
          Rob

          Moderator

          All responses based on the 2017 NEC unless otherwise noted

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            #6
            Found a text on the 2017 NEC handbook describing this situation I think this will suffice.
            "Some buildings or structures may have discontinuous segments of a footing or foundation
            that individually qualify as grounding electrodes per this section and
            once one has been bonded to the grounding electrode system, the
            remaining ones are exempt from any bonding or grounding requirements."
            Thanks you all.

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