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It may be one of the following reasons:

  • It may In US, the frequency is 60Hz and 110V supply, but in India is about 240V, 50Hz supply. For a particular load say 100kW the current will be 0.416A. But in US the same load will consume about 0.9A. Here the thing is the heat produced in the cable because of the flow of current will be large in US compare to India. Since US is a cold country they can use this level but not in India.
  • Moreover, once standardisation is fixed for Indian (50Hz) by British, so its continuing and in America its 60 Hz according to their standardisation.
  • Its only because, too low value will create fluctuation in apparatus like Bulb starts blinking(persistence of eye is 15 Hz) and too high value will lead more hysteresis and eddy current losses in many machines.
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9y ago

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