gary350
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We should have gone camping today it is going to snow 6" tonight.
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Post by gary350 on Dec 12, 2015 4:22:48 GMT -8
The principal function of the first electric power utilities company was to provide power for electric lighting. The manufacturing tolerance for early carbon filament lamps was not very tight. So after their manufacture, the lamps were sorted into 110v, 115v, and 120v bins. Power utilities were encouraged to standardize on different voltages to create a market for all of the lamps, resulting in different nominal supply voltages in different regions. After the introduction of tungsten filament lamps in the 1910's, which could be manufactured to much tighter specs, there was no longer a need for this voltage variation, and lamps were standardized at 115 volts. The utilities eventually adopted 120 volts as the supply standard (allowing for a 5 volt drop in the distribution system). Now we have LED lights and many others.
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