Consider a drytype with hiside taps. Using the lowest (-5%) FCBN tap, a ratio of 480:240x0.9, 208V on the secondary will produce ~437V on the primary.
www.acmepowerdist.com/pdf/Page%209.pdf www.acmepowerdist.com/pdf/Page%2055-63.pdf Connection Diagram 3 — PRIMARY: 240 X 480 SECONDARY: 120/240 TAPS: 2, 2½% ANFC, 2, 2½% BNFC
[There are 208∆—480Y/277 transformers available, but they start at 15kVA.
]www.acmepowerdist.com/pdf/Page%2014.pdf] [This message has been edited by Bjarney (edited 01-22-2005).]
