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Ground Fault Exemptions

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  1. Kalbi_Rob's Avatar
    Kalbi_Rob is offline Seasoned Member Pro Subscriber
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    Ground Fault Exemptions

    So, a few years ago I got into an argument with Eaton rep about a solar site requiring ground fault on the 4000A breaker downstream a 12kV Delta/480V Wye transformer but 3W breaker. He convinced the customer that it was not required because the breaker was a three wire system. I came behind, and he pulled out the below website with ground fault exemptions, which I had never seen. It does give the general exemptions to NEC 230.95, 215.10, and 240.13, but he failed to realize the transformer was a solidly grounded 480/277V Wye because only 3 phases were landed on the breaker.

    My question is, has anybody ever seen these exemptions used to avoid installing ground fault protection?

    http://www.cooperindustries.com/cont...ements_GFP.pdf

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