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  1. #1
    Join Date
    Mar 2007
    Location
    Cape Cod, Massachusetts
    Posts
    603

    Default Grounding conductor size

    This service has a solid copper wire for its grounding conductor that is attached to a rod in the adjacent concrete foundation wall. My question is in regards to its size. Is this adequate for this 200A service? Just to clarify, the braided #6 copper conductor that exits through the bottom of the panel is the metal pipe bonding cable. The house is on a well fed with plastic pipe and is not part of the grounding system.

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  2. #2
    Join Date
    Mar 2007
    Location
    Garland, TX
    Posts
    671

    Default Re: Grounding conductor size

    badair http://www.adairinspection.com Garland, TX 75042 TREC # 4563
    Commercial-Residential-Construction-EIFS-Infrared Thermography
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  3. #3
    Join Date
    Aug 2008
    Location
    Maryland
    Posts
    1,940

    Default Re: Grounding conductor size

    A #6 copper to a rod is all that is required even for a 2000 amp service.

    All answers based on unamended National Electrical codes.

  4. #4
    Join Date
    Oct 2014
    Location
    Maryland, DC, and Northern Virginia, electrical only
    Posts
    160

    Default Re: Grounding conductor size

    I'm afraid the answer depends on whether the grounding electrode conductor falls under NEC Section 250.66(A) or (B). If there is a single grounding electrode, it shouldn't be just a single rod unless they verified <25 Ohm. With a rod, yep, 6 AWG. If it's a concrete-encased electrode and the rod is actually a rebar stub-up, then a single electrode will fly--but the GEC needs to be 4AWG.


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