I can't believe the controversy that my seemingly simple question has stirred up. Nice to know that there's a place where the finer details of design are hammered out. Thanks again for the help guys.
How do you properly size a 4 wire, 3 phase delta-wye transformer with 480Vac primary to supply a 100A distribution panel for 120Vac loads (do I use 208Vac or 120Vac in my calculations)?