208 to 480 step up transformer GEC

benmin

Senior Member
Location
Maine
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.
 

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
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.
 
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