Okay- What are doing for transformer overcurrent?? I say we protect the primary at 125% of it's capacity and forgo protection of the secondary. If that's the case we can protect the primary at 125% x 90 = 112a. so we use a 125a overcurrent protection. gives me a #1/0 wire. Now we don't have to protect the secondary. This overcurrent protects the transformer. If we go over 125a. on the primary we would have to add secondary protection.
Added edit:
I'm going on the basis that we have a 480v. 3Ø primary and it is a 75kva xformer. Sorry bout that guys.
[This message has been edited by George Little (edited 09-09-2005).]
