NFPA 497 Remended practice for the Classification of Flammable Liquids ,Gases ,or Vapors and of Hazardous ( Classified)Locations for Electrical Installations in Chemical Process areas 2021 NFPA IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA STANDARDS NFPA codes ,standards ,remended practices ,and guides ( "NFPAStandards "),of which the document contained herein is one ,are developed through a consensus standards development process approved the American National Standards Institute .This process brings together volunteers representing varied viewpoints and interests to achieve consensus on fire and other safety issues .While the NFPA administers the process and establishes rules to promote fairness in the development consensus ,it does not independently test ,evaluate ,o verify the accuracy of any information or the soundness of any judgments contained in NFPA Standards . The NFPA disclaims liability for any personal injury ,property ,or other damages of any nature whatsoever , whether special ,indirect ,consequential or pensatory ,directly or indirectly resulting from the publication ,use of ,or reliance on NFPA Standards .The NFPA also makes no guaranty...