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Thread: Pier grounding detail

  1. #1
    Join Date
    Jun 2007

    Pier grounding detail

    Did anyone know why a industrial steel building needs this detail?
    Does anyone know if this is a requirement per any codes? Thanks.
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  2. #2
    Join Date
    Aug 2004
    Northern illinois
    perhaps the building steel is not a grounding electrode as defined by the code.

    or maybe someone just decided to do it this way.

  3. #3
    Join Date
    Mar 2013
    California, USA
    If the structure is electrically served, then it is required to be grounded.

    If there is 20 linear feet or more of interconnected rebar, an astute inspector will require it to be connected to the proposed ground rod under 250.50. Which in turn obviates the need for the ground rod in the first place.

    However something the code does not cover is longer term galvanic corrosion. I would recommend you to simply coil 20' of bare Cu #4 elevated off the lowest rebar with PVC spacers and be done with it.

  4. #4
    Join Date
    Oct 2007
    New Jersey
    I'm not sure if the detail intends this, but it appears that the ground rod is driven under the pier, with an exothermic welded wire. My understanding is that the pier should be poured on top of undisturbed or compacted ground, or gravel. That doesn't appear to be what they are doing here.

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