I'm trying to find out if areas containing paper dust (from tissue-grade papermaking operations) are considered hazardous locations. Looking at the NEC, NFPA 499 and NFPA 664, it appears cellulose is a Group G combustible dust. But it also looks like this pertains more to the fine wood dust that is produced in some wood processing and wood working facilities, not to paper dust. On the other hand, these standards also indicate that their lists are not all inclusive, and I can't find anything that specifically excludes paper dust. Any advice or guidance would be sincerely appreciated!