These requirements cover antenna rotators intended for household and commercial use on supply circuits in accordance with the National Electrical Code@ NFPA 70.An antenna rotator generally consists of:a) A mast-mounted (generally outdoors)@ motorized drive unit that rotates the antenna to the desired receiving azimuth@b) An indoor-located (usually near television- or radio-receiving equipment) user-operated control unit that delivers operating power and direction signals to the drive unit@ and@ c) A length of multiple-conductor Class-2 circuit cable to electrically interconnect the drive unit and the control unit.Some antenna rotating units may control antenna elevation separately or in addition to azimuth. In some cases@ the drive unit may be located indoors.The power used to drive the motor of an antenna rotator is derived from a circuit complying with Class 2 limitations in accordance with Article 725 of the National Electrical Code@ ANSI/NFPA 70.These requirements do not cover systems that use a stationary antenna and change or rotate the receiving pattern by electronic or switching means. Such systems are covered by the Standard for Audio-Video Products and Accessories@ UL 1492.