Answer / mahavir jagdev

220, 50 HZ was used by the British and India too followed it just like in Europe. The Americans being different as usual chose 110v 60 HZ for domestic supply. The 110 v was for safety from getting a shock, but the 60 HZ equipment will have more eddy current losses but for 3 phase the synchronous speed of the motors will be higher.

Answer / biswa.biswa2010

my country is the supply system with 50Hz and in system
supply system equipment is made from the 50Hz supply.60Hz
supply is not used in this caused.

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