Sine Wave Power
In the U.S., utility companies provide power to households and offices by distributing single phase alternating current (AC) power at a frequency of 60 Hz. Electrical power can be graphically depicted as a sine wave whereby the electrical signal alternates from +120 volts to -120 volts at a rate of 60 times per second (60 Hz). To enable more efficient operation of large, heavy equipment, utility companies provide commercial and industrial locations with three phase AC power which consists of three overlapping sine waves offset by 120 degrees.
Although utility companies strive to distribute 100% sine wave power, many factors can introduce electrical noise into the AC power signal in the form of sine wave distortions and as voltage sags, surges, spikes, or other irregularities. Sine wave power is important for the optimal functioning of sensitive desktop computers and related peripheral equipment. Without sine wave power output, microprocessor-based equipment can become inoperative or sustain damage from power signal distortions.