This three phase power from the alternators is further transmitted to the distribution end through transmission lines. In the alternator, three stator windings (or say three independent coils) typically separated by some number of degree of rotation and hence the current produced by that coils is also separated by some degrees of rotation, which is typically 120 degrees. Three-phase AC power is generated by a three-phase alternator (also called as AC generators) in the power plants. Therefore, it is rarely used for domestic installations, but commonly used in commercial buildings, offices and industrial installations. The three-phase power service is generally used for high power rated equipments such as large air conditioners, high rated pump sets, air compressors and high torque motors. Therefore, generally they are often installed with three phase wiring or three-phase supply. Large buildings, plants and offices have greater power requirements than the power used in domestic installations. The need for three-phase supply or service occurs when heavy equipments are present such as large motors (beyond 5 HP motors), because such large equipments need high starting and running currents.
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