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110 V 60 cycle is common house current that runs most appliances, TV's, Radio's, Computer's, and lights. Most A/C units operate on 220 V as do many welders, electric dryers, generators, or heavy duty shop equipment. 440 V is pretty much industrial.
Since I am not an electrician I am guessing here when I say most household devises are single phase where as the heavy duty stuff normally use multi-phase power sources.
Clois
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Sunshine, Asphalt and no stop signs...Perfect
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