The Hemodialysis area comes under 517 essential lighting and redundant grounding , either battery back up or Generator. The exam areas Redundant grounding, general purpose area outlets(not a patient bed area),Exam rms exit corridors battery back up lgts.
This is the way I see it also per article in I.A.E.I. Jan./Feb 1993.
Enought power and lights to finish the task at hand and safelty exit the building. Also theres an X ray room, em(battery ok) lgts and redundant grounding. I have a eng, telling us only hemodialysis area comes under essential lighting. Like to know how other Inspectors enforce this in the code.