trg-s338 wrote:
...if wired 220V 3 phase on the
secondary, I could get 480V 3 phase out of the primary? ...

Yes & no. 1st - if you actually have 220 & not 240, then no. But you
probably have 240 (most single phase is 240, I dunno about 3 phase). If
so, then you could use the 504v taps & get 450 - 475v out. This is
because of core losses. I'm assuming 5 - 10%, but that's a guess.

Good luck,
Bob