Reno,
A) Tells us where exit signs and 'bugeyes' are needed?
B) Tells us when we need to use the red putty pads on our boxes?
C) Tells us that piping inside a walk-in cooler can't be run flat on the surface?
D) Tells us we can't use lots of recessed (incandescent) lights?
E) Tells us where to place the alarm strobes?
I am not in my office yet, but I believe a lot of these questions can be answered in the NFPA for example, where to put exit and emergency would depend on the footcandles required at the means of egress.
When to use putty pads comes down to the fire rating of the wall. If the wall has to be fire rated, you must make sure that there aren't too many openings between the walls. Same goes for recess lights. I was on 1 job where you couldn't have more than 10 sq feet inside a 100 sq ft area. So the job was limited to 4 recess lights per room.
As for running a pipe inside a walk in cooler, I am not sure that I have heard that one before.
