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Thread: UL508A grounding conductor

  1. #11
    Join Date
    Aug 2010
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    Texas
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    I was looking at wrong table; it is UL508A table 15.1 not 75.1. And it clearly says "minimum wire size" so I am pretty much sure I cannot parallel the ground wires for the same ampacity of minimum wire size.
    "Because it's there!"
    George Mallory

  2. #12
    Join Date
    Jun 2006
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    Quote Originally Posted by Dennis Alwon View Post
    I thought the code was permissive---if it does say you can't then you can....you all are changing the rules....LOL
    Quote Originally Posted by Dennis Alwon View Post
    Tell me this. I can run a smaller conductor for 2- 200 amp panels to each disconnect and be compliant. Can I run those separate grounding electrode conductor's (#4's) to the same meter instead of the disconnect? If I can run it to the disconnect why can't I run it to the meter instead? Seems no different than a parallel grounding electrode conductor.

    I have never done it but I can't seem to find where it may be non compliant..
    While staying permissive, you cannot violate the minimum size GEC requirement. Code offers no avenue to determine a parallel smaller equivalent, such as using fractional ampacity for parallel circuit conductors.

    Your challenge has merit, but Code (paraphrased) requires the GEC size to be determined according to the largest ungrounded conductor at the point where the GEC is connected. Connecting two GEC's at the meter for two 200A panels would be a violation because each GEC is not sized for the largest ungrounded conductor where it is connected.
    I'll never get there. No matter where I go, I'm always here.

  3. #13
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    Quote Originally Posted by Smart $ View Post
    Connecting two GEC's at the meter for two 200A panels would be a violation because each GEC is not sized for the largest ungrounded conductor where it is connected.


    And connect it the panel 4" away from the meter and it is compliant.

  4. #14
    Join Date
    Jun 2006
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    Ohio
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    Quote Originally Posted by Dennis Alwon View Post
    And connect it the panel 4" away from the meter and it is compliant.
    It is what it is. You should know as well as anyone that requirements do not always exhibit logical conclusions. That said, I know you know the process to get it changed.
    I'll never get there. No matter where I go, I'm always here.

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