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208 to 480 step up transformer GEC

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    208 to 480 step up transformer GEC

    75kva 208 delta to 480 wye step up transformer. How do you size the GEC? I'm assuming it's sized off the 480V conductors but not certain. Also I'm assuming I need to bond to the neutral even though I am not utilizing it for the equipment the transformer is powering.

    #2
    Yes the derived (480Y/277 volt secondary) conductors are used the size the GEC and the SBJ. And yes you need to bond the neutral with a Wye secondary.
    Rob

    Moderator

    All responses based on the 2017 NEC unless otherwise noted

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