There are few or no 220 volt circuits in North America. Your choices in that range are 208V or 240V. But yes, a power supply can draw around 240V times 20A = 4

There are few or no 220 volt circuits in North America. Your choices in that range are 208V or 240V. But yes, a power supply can draw around 240V times 20A = 4800VA, which is nearly 4800W if the power factor is close to 1. An office in an office building is more likely to have 208V.