Flourescent lighting fixtures each containing two ballasts rated at .8 amps each at 120 volts are to be installed for continuous general lighting in a store. The overcurrent devices are not listed for continuous operatio n at 100% of their rating. According to NEC, what is the maximum number of these lighting circuits that may be wired to a 20 amp, 120V branch circuit?

Flourescent lighting fixtures each containing two ballasts rated at .8 amps each at 120 volts are to be installed for continuous general lighting in a store. The overcurrent devices are not listed for continuous operatio n at 100% of their rating. According to NEC, what is the maximum number of these lighting circuits that may be wired to a 20 amp, 120V branch circuit?