The manual clearly states 230V. single phase input. The local Rockler store manager mentioned last month that he had lost a few sales to schools and business that had 208V 3 phase distribution. He had talked to Powermatic and the response was 230V. single phase only. There was no plan to supply a version of the inverter that would take 3 phase also, similar to the 3520 A & B. I would be reluctant to hook up to a 2 pole breaker on the 208 distribution w/o prior approval from Powermatic or the inverter supplier. There may be more of a problem than the difference in voltage.