A DC rectifier type welding machine has a 40% duty cycle at 480 volts, 3 phase. The nameplate primary current rating is 23 amps. The minimum ampacity for the ungrounded branch circuit conductor is _____ amps.

A DC rectifier type welding machine has a 40% duty cycle at 480 volts, 3 phase. The nameplate primary current rating is 23 amps. The minimum ampacity for the ungrounded branch circuit conductor is _____ amps.