This standard provides specifications for and operating characteristics of ballasts for mercury@ metal-halide@ high-pressure sodium (HPS)@ and low-pressure sodium (LPS) lamps. The ballasts operate from multiple-supply sources of 600 volts maximum at a frequency of 60 hertz. They may be designed for operation under either indoor or outdoor conditions. The following types of ballasts are excluded from this standard: (1) Ballasts consisting of resistance only (2) Transformers for constant current (series) operation of mercury lamps (see American National Standard for Mercury Lamp Transformers - Constant Current (Series) Supply Type@ ANSI C82.7-1983 (R1988) (3) All ballasts that use semiconductors to control the lamp power.