scope:

This standard is intended to cover ballasts which have rated open-circuit voltages of 2000 volts¹ or less and are intended to operate at a frequency of 50 Hz or 60 Hz. This comprises ballasts for hot-cathode fluorescent lamps, either switch-start (preheat-start), rapid start (continuously heated cathodes), or instant-start, and also ballasts for cold-cathode fluorescent lamps, used primarily for lighting purposes, which come within this voltage range. The ballast and lamp combinations covered by this specification normally are intended for use in room ambient temperatures of 10°C to 40.6"C. At ambient temperatures outside this range, certain special operating characteristics may be required.

¹ See ANSI/NFPA 70-1984 for requirements for various voltage classifications.