NFPA (Fire) 497

Classification of Flammable Liquids, Gases or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2017 Edition
standard by National Fire Protection Association, 06/02/2016

NFPA (Fire) 805

Performance-Based Standard for Fire Protection for Light Water Reactor Electric Generating Plants, 2020 Edition
standard by National Fire Protection Association, 11/24/2019