OK, between all the words and details above, did you change BOTH the primary (480) fused disco, AND the secondary fused disco (208) ??
What was the physical condition of the 'blown' C-Phase 600 volt fuse? Was it a new fuse, or did you re-install the old fuses, IF you touched the primary fuse.
Did anyone possibly turn on the transformer and inrush blew the primary fuse?
BTW, does the 208 volt transformer have any taps to compensate for VD, which may need to be raised??
