Three Phase Electricity

Multiple phase power supply or load that uses at least three wires where a different voltage phase from a common generator is carried between each pair of wires.

In a three-phase generator there are three windings, typically designated as A-B-C, R-S-T or U-V-W. The phases are 120° out of phase with each other. That is, the instants at which the three phase voltages pass through zero or reach their maximums are 120° apart, where one complete cycle is considered 360°.