By the way I agree with Gregtaylor that article 520 covers the auditorium of a movie theater and 520.5(A) prohibits NM for general fixed use lighting and power but take a look at the exception.
520.5(A)Exception: Fixed wiring methods shall be as provided in Article 640 for audio signal processing, amplification, and reproduction equipment, in Article 800 for communication circuits, in Article 725 for Class 2 and Class 3 remote-control and signaling circuits, and in Article 760 for fire alarm circuits.
Notice that the reference to article 725 are only for remote-control and signaling circuits.
What John C is installing is not either remote-control or signaling circuits, it is power limited wiring.
I think the NM has to go.
Bob
