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 operation at 100% of their rating. According to code , how many fixtures may be installed on each 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 operation at 100% of their rating. According to code , how many fixtures may be installed on each circuit ?