subject: Ups Neglected Downstream Power Efficiency [print this page] 400Y230 volt distribution in the world outside the United States is the standard in many areas. Computer equipment power at 230 volts (line to the midpoint of the voltage). A 30 amps, 400Y230 volt, 3 pole, 4-wire branch circuits can provide about 15kW of load, is about the traditional 208Y120 volt system can provide twice as much. Therefore, practices in the United States, few downstream UPS transformers, were 1.5% -3% efficiency.
