You may also leave the neutral and not take it as a circuit conductor and not ground it. In that case, you would have a 480-volt, ungrounded, delta, 3-wire feeder. You are permitted to "corner ground" the delta, put in ground detection equipment, or set it up just as you would any delta system. After the feeder leaves the confines of the transformer enclosure, you cannot determine that its configuration started out as a wye. [Linked Image]

Charlie Eldridge, Indianapolis Utility Power Guy