Assertion: outlet's voltage | /r/AtLocation | use
Facets:
Source sentences:
text: The choice of supply voltage is due more to historical reasons than optimization of the electric power distribution system—once a voltage is in use and equipment using this voltage is widespread, changing voltage is a drastic and expensive measure.
text: The voltages listed here are the nominal figures reported to be in use at most residential or commercial sites in the country or area named.