Indoor dry type transformer outside for temporary wiring

[Sparkey1981]

Looking for some help as to find a source that says using a indoor transformer outside for a temporary freezer for a couple weeks at a fair is a no go either NEC or OSHA. The problem is they have done this in the past and believe it is ok. It is a 480 volt transformer wired backwards to step up the 208 to supply the freezer. Now that I am the Licensed Electrician in charge I have a problem with having a indoor transformer outside as well as 480 volt transformer where public could be in contact with it .
Any thoughts or sources would be appreciated or if I am totally wrong and you have a reason why this would be ok let me know as well.
Thanks !

 

[zbang]

Other than weather, what's the concern? Add a rain-tight "3R" kit and it'll be OK for that (there was another thread about this recently).

The transformer shouldn't be "in public" but at least surrounded by a low fence or barrier; if it's in what would be considered non-public space I don't think it even needs that.

 

[Frank DuVal]

Or make a rain shield/umbrella for it, making it "indoors". The windings don't care, as long as water is not running across them. Condensation happens with the 3R kit anyway.