Is a feeder conduit permitted to pass through an exit stairwell enclosure? The lighting in the exit stairwell is supplied by the emergency system (generator) supplying the building.
Any guidance would be appreciated,
The short answer is no.
Section 300.25 and indicates that where an exit stairwell enclosure is required to be separated from the building, only wiring electrical methods permitted by the AHJ and serving equipment in the exit stairwell are permitted to be installed in the exit stairwell enclosure.