Not exactly sure of the question, but take a look at 404.6, and 404.7. And 408.19.
I believe that in codes past, it was not only required to have up be ON, and down be OFF, but also connections on top be LINE, and below be LOAD. Making the handle in the on position point toward LINE, and that is pretty standard. (At least the way I learned it.) It may have been part of Phase Arrangement codes? I think all switches are made that way anyway, with terminals marked LINE on top, I can't remember ever seein' any that were not made that way. Except double throws.... In fact the only circuit breakers I can think of that were not also like that are FPE, and only some of them.
Darn good question....
"Well - I oughta....." -Jackie Gleason