I am trying to find a code that states the use of ungrounded equipment in an industrial building is either acceptable or not. There are several personal fans in our facility that are the standard home use 2 prong connector (ungrounded). Also we use some other 2 wire equipment. All is UL approved as manufactured, but I have concerns over the use in this facility. It would be easier to have them removed if I could cite a code that says it is not acceptable.