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OSHA stairs

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For fixed industrial stairs, OSHA requires in paragraph 1910.24-(c): "Fixed 
stairways shall be designed and constructed to carry a load of five times
normal live load anticipated but never of less strength than to carry safely
moving concentrated load of 1,000 pounds."  UBC requires exit stairways to
designed for 100 psf or a concentrated load of 300-pounds.  If you are 
installing a stair in an industrial building which could also act as an exit 
stairway, how is OSHA to be applied?   
Are the loads given by OSHA to be applied as "working loads" at basic 
allowable stress or to be compared to yield or ultimate strengths?  For a
load of 100 psf, do they really mean to design the stair for 5 times 100
If the stair is not an exit stair, what does "normal live load anticipated 
mean"?  I find the inconsistency in these provisions rather confusing and 
difficult to apply.