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It is very unlikely you will ever come across a two-phase system, which is an archaic system that predates three-phase systems, in which two phase voltages are displaced from each other by 90 degrees.

The North American system for supplying residential consumers is a 'split phase', not a 'two phase' system, in which one secondary phase winding of a transformer is centre-tapped, thus providing a combination of 240 V between line conductors and 120 V between either line conductor and the centre-tapped neutral conductor. In all probability a 220-V load would operate normally at a nominal voltage of 240 V.

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