I know that the discussion of "Grounds up or down" have been discussed at length in multiple threads. Even though it is not an NEC requirement, in a recent thread someone mentioned that OSHA required the grounds to be up, maybe in an industrial enviornment. I have been trying to locate the thread but have had no luck. I would like to find out if this is indeed a fact and where I could find the requirement on OSHA's web site.
A gentleman recently made such an assertion of such a requirement in his letter, published in NEC digest. I think that's where this came from. The author provided no references or documentation.