220 is usable in the U.S. In the U.S., large industrial customers receive power in three phases, offset 120 degrees, which are each 120 relative to neutral and 208 relative to each other, and residential and small commercial customers receive power in two phases, 180 offset to each other, 120 relative to neutral and 240 relative to each other. Both types of customers can use 220 volt products, because 208 and 240 are close enough.
However, the U.S. does not have 50 Hz power available. Nearly everything is 60 Hz, except some things meant for airplanes, which are 400 Hz. If your system requires 50 Hz and cannot run on 60 Hz, then it would not be usable in the U.S.