Generator Emergency Lighting

[solarEI]

NFPA 101-7.9.2.3 (Performance of emergency lighting systems) states The emergency lighting system shall be arranged to provide the required illumination automatically in the event of any interruption of the normal lighting to due any of the following...opening of a circuit breaker or fuse...

It appears an emergency generator system does not meet this requirement. If the branch breaker (fed from generator and serving the emergency lighting circuit) trips, the emergency lighting would turn off which would be a violation of this code.

Emergency generators are allowed to be used to provide backup power for emergency lighting in every jurisdiction I have ever worked in, what am I missing?

 

[Coppersmith]

Based on my reading of section 7.9.2, The emergency lights are required to have battery backup. The emergency generator charges the batteries when utility power is down.

 

[ron]

In the jurisdictions I work in, the code requirement comes from the Building Code.
For example, the IBC 1008.3 it indicates more generic terms like "in the event of power supply failure". That allows for the supply failure to be higher in the distribution than a local branch breaker, such as a CB or fuse at the main or serving the normal side of the ATS's distributed throughout the building for example.