Events
(1881)Worlds first AC public
electricity supply
(water wheel driven)(1882)Worlds first large-scale DC
central plant (steam powered)(4 sep 1882)Large "Pearl Street Station"
was finished, runnings on steam
power and supplying DC. It was run
on the "safe 110 volts".(1885)AC systems appeared across
the US with 110 voltage,
which was considered safe(1 sep 1939)World War 2(2 sep 1945)Voltage in US becomes
117 volts but US lagged behind(1976) Nominal voltage
rose to 120 volts
Comments