NFPA 497:2024

Chapter 1 Administration 1.1 Scope. 1.2 Purpose. 1.3 Relationship to NFPA Codes and Standards. Chapter 2 Referenced Publications 2.1 General. 2.2 NFPA Publications. 2.3 Other Publications. 2.4 References for Extracts in Recommendations Sections. Chapter 3 Definitions 3.1 General. 3.2 NFPA Official Definitions. 3.3 General Definitions. Chapter 4 Classification of Combustible Materials 4.1 National Electrical Code Criteria. 4.2 Behavior of ClassI (Combustible Material) Gases, Vapors, and Liquids. 4.3 Conditions Necessary for Ignition. 4.4 Classification of ClassI Combustible Materials. Chapter 5 Classification of ClassI (Combustible Material) Areas 5.1 National Electrical Code (NEC). 5.2 General. 5.3 Class, Division, Classified Locations. 5.4 Zone Classified Locations. 5.5 Unclassified Locations. 5.6 Extent of Classified Locations. 5.7 Discussion of Diagrams and Recommendations. 5.8 Basis for Recommendations. 5.9 Procedure for Classifying Locations. 5.10 Classification Diagrams for ClassI, Divisions.

1.1.1 This recommended practice applies to those locations where flammable gases or vapors, flammable liquids, or combustible liquids are processed or handled; and where their release into the atmosphere could result in their ignition by electrical systems or equipment.