Do you mean 230 volts, instead of 220 volts? I'm going by memory here, but I believe the various voltages are:
Utility Voltages
208/120V (the higher voltage is supposed to be first on 3 phase systems).
120/240V (lower voltage first for 1 phase).
But motor and equipment voltages are usually specified a little lower to allow some voltage drop on the feeder and branch circuits. (With motors, a lower voltage often means a higher current, so using a lower voltage is actually being conservative.)
200V for a 208V utility voltage
230V for a 240V utility voltage.
460V for a 480V utility.
Then there are the older, slightly lower voltages that were used by utilities decades ago. These were slowly raised to get our present voltages (the higher voltages are more efficient). But you may still hear some people refer to these older numbers. To me its really confusing to use these numbers, and I usually hear them from people who don't know what they are talking about (the same people that usually say "Its probably a short" anytime something doesn't work):
110V, 220V, and 440V.
Since the voltages were raised slowly over many years (both the utility voltages and the appliance voltages), you may even hear some in between numbers like 115 or 117V.
So back to your question: a motor that would work on both 240V and 208V would be slash rated as 200/230 volts.
