I'm not even an electrician and I wish guys could say thinks like; I have a 4 wire, 3phase, 480/277 Wye panel. Stating only the loads leads to lots of unnecessary guessing. I mean I suppose I "could" have a single phase 120 X 277 VAC transformer at my house for exterior lighting.
ok so I'd assume in the calculation steps for the breaker feeding the panel, the panel size and the feeder for the panel one sizes the panel first, the breaker that feeds that panel then the feeder to the panel? thanks