What electrical input power requirements does the Miller Spectrum 375 need?

The Spectrum 375 accepts either 120 VAC or 240 VAC single-phase input power at 50/60 Hz. For 120 VAC input with 20 amps capacity, it requires 25.6 volts AC RMS with 11.4 amps RMS input current. For 240 VAC input, it requires 13.6 volts AC RMS with 8.1 amps RMS input current. A 15 or 20 ampere individual branch circuit protected by time-delay fuses or circuit breaker is required for 120 VAC input. (Page 11, 15)