Power Quality Some splitphase power sources may be 2v, 1v, 115v, and so on, but highervoltage applications are more common nowadays You'll probably see 240v the most often, but The standard 15A 1V circuit has capacity for 18kW * 80% = 144kW The standard 30A 8V circuit has capacity for 624kW * 80% = (about) 5kW That is a huge difference Also 120/208 or 120/240