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Thread: 250.66 vs 250.102(C)(1)

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    250.66 vs 250.102(C)(1)

    When sizing an grounding electrode conductor, is anything over 1100cu - "3/0" max required ? Or do you have to do the 12.5% of area as required by 250.102(C)(1)
    " I'm at a crucial part of my painting "...........Monika Danneman

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    Quote Originally Posted by ritelec View Post
    When sizing an grounding electrode conductor, is anything over 1100cu - "3/0" max required ? Or do you have to do the 12.5% of area as required by 250.102(C)(1)
    3/0 is max for a GEC. This is the reason that the new Table 250.102(1) was created to attempt to make clear that GEC max out but bonding does not.

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    That's it, if it's a GEC it's never required to be larger than #3/0. The 12.5% would apply to system bonding jumpers, main bonding jumpers, etc. Our 4000 amp services have the same size GEC as our 225 kva transformers.
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

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    Thank you
    " I'm at a crucial part of my painting "...........Monika Danneman

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