Distance fro floor to sign for location of fire extinguisher?
If you refer to clause 188.8.131.52 NFPA 10 (2013 edition), signs showing the location of a fire extinguisher needs to be close to the fire extinguisher and visible from a normal path of a person. I recommend that you use the 1525 mm measured from the FFL (finished floor level) to the bottom of the fire extinguisher sign. This distance is taken off from clause 184.108.40.206.4.1 NFPA 101 (2012 edition).
That citation (101-220.127.116.11.4.1) is the detail for Stairway Identification and may not be appropriate for a fire extinguisher location depending on other obstructions. NFPA 10- 18.104.22.168.2 and 22.214.171.124.3 explain when and roughly where the signs should be utilized.
Maybe I'm wrong, but it seems a lot of places put too much emphasis on the signs. We find extinguishers with signs directly above them less than 24" away on flat walls. It would seem the intent is to direct someone to the extinguisher when it's not readily visible from a reasonable distance. I like think of a big box store, where placing the sign above the extinguisher on a column makes the location readily apparent from a much greater distance. Putting the sign on a corridor wall above a red extinguisher that projects out from the wall seems a bit overkill?
The above being said, I'd say to properly affix a sign you need to have the tenant "fit out" complete so you can see what distance from the floor helps identify the location of the extinguisher.
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