Re: NM CABLE IN COMMERCIAL POLE BARN
The description of this building does not need reference to Article 511.
The OP calls the building a 'pole barn', but maybe he means a post and beam building - notice he says it is being used for storage only... storage of what, I am not sure. That being said, I do not think that Art 547 needs to be referenced either. If the building is being used for storage, I am not sure why it would be a wet or damp location either.
So... I say this is a standard storage building and we need to reference Art 334.
NMC is not commercially available, but could be special ordered.
NMB is really the only type of NM cable commercially available today. Depending on the type of construction would let us know if NM could be used - without that knowledge it is hard to say.
As far as hanging things from NM, I have seen things hung from AC and EMT as well with some pretty poor results. The wiring method is not the problem, the hangee is