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  1. NFPA (Fire) 497

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    Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2024 Edition

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  2. NFPA (Fire) 497


    Classification of Flammable Liquids, Gases or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2021 Edition

    • Historical Version
  3. NFPA (Fire) 497


    Classification of Flammable Liquids, Gases or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2017 Edition

    • Historical Version
  4. NFPA (Fire) 497


    Classification of Flammable Liquids, Gases or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2012 Edition

    • Historical Version
  5. NFPA (Fire) 497


    Classification of Flammable Liquids, Gases or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2008 Edition

    • Historical Version