The U.S. electrical grid operates at
60 Hertz or 60 cycles per second. Because of, literally, the "mass" of
the U.S. electrical system, it is very unlikely to encounter frequency
problems. Virtually all electrical devices are capable of operating
properly at frequency variations much larger those that could be seen
in the U.S. The concept of very stable frequency does not apply
to closed systems where electricity is generated on-site. Even large
diesel-generator sets can have frequency problems. Also see Operating
Frequency. |