Historical
NEMA ANSI C82.4:2002
Ballasts for high - intensity - discharge and low pressure sodium lamps (multiple-supply type)
Provides specifications for and operating characteristics of ballasts for mercury, metal halide, high-pressure sodium and LPS lamps. The ballasts operate from multiple-supply sources of 600 V maximum at a frequency of 60 Hz.
NEMA: National Electrical Manufacturers Association [nema]