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Industrial power transformers are commonly used with American Rotary phase converters. In North America, most three phase utility service is nominal 208 volts, while single phase utility service is nominal 240 volts. A phase converter will change the phase (for example, from single phase 240V to three phase 240V), but a transformer may sometimes be necessary to change the voltage of the system (for example, 240V utility can be changed to 208V with a transformer).