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It's complicated, it depends. It would be nice to see less than 10%. The first issue that arises is voltage regulation. Small generator sets may only sense voltage on one leg so if that leg is under substantially different load conditions then the output voltage of the other two legs would not...

Typically, in an industrial setting, a 480 to 208Y/120 transformer is used. For single phase power one tap is used and neutral. Some consideration must be made to balance the load between the 3 phases if the single phase loads are large. In my shop, I have 3 single phase panels, each one is...

How many wire leads are in the generator enclosure? If it's a 12 lead generator set it can be wired as zig zag or double delta for a dedicated single phase output at full rating. Otherwise, you should be able to wire as open delta with some 55% of rated output.