Answer / pradyumna chandra panda

In 3 phase supply phases are120 degree electrical aparts each and for a technician it is easy to use such connect the machine with sequence or obtain uniform rotating magnetic field in motor, so India follow this.

Answer / raheel4u

3 Phase has 3 wires carrying power (a 4th wire has ground). The voltages on the 3 wires with respect to ground each look like a normal sine wave at 110V but the peaks of the sine waves are delayed evenly so that wire 1 peaks, then wire 2, then wire 3, then back to wire 1 in equally timed spacing. This is called 120 degree phase between any 2 wires. This is the power coming out of power plants. 3 Phase is easy to use or create with generators and motors. 3 Phase was chosen because it needs less copper to carry power long distances. Modern technologies (transistors) can be very efficient with converting DC voltages now but when the power grid system was created we mostly only had transformers and wires.

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