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Low voltage power grid, gadgets, What is the advantage ? Is it expensive?

In India we have power 220v. 50HZ 440v three phase. In US 110 volts,60HZ I worked as a technician in middle east . American machines performed well.many countries 220v. I heard 110 volts is not hazardous for Humans.To switch over to low voltage is it expensive? People were electrocuted due to poor safety standards in India. Can anyone explain?

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