NFPA 497:2024
Current
The latest, up-to-date edition.
Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas
Hardcopy
English
01-01-2024
Important note : Users cannot be edited or removed once added to your Multi user PDF.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.
| DocumentType |
Standard
|
| ISBN |
978-145593062-3
|
| Pages |
79
|
| PublisherName |
National Fire Protection Association
|
| Status |
Current
|
| Supersedes |
| PIP ELCGL01:2023 | Electrical Design Criteria |
| NFPA 59A:2023 | Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG) |
| ASTM D 323 : 2020 | Standard Test Method for Vapor Pressure of Petroleum Products (Reid Method) |
| NFPA 36:2021 | Standard for Solvent Extraction Plants |
| NFPA 34:2021 | Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids |
| NFPA 30:2021 | Flammable and Combustible Liquids Code |
| NFPA 45:2019 | Standard on Fire Protection for Laboratories Using Chemicals |
| NFPA 58:2020 | Liquefied Petroleum Gas Code. |
| NFPA 33:2021 | Standard for Spray Application Using Flammable or Combustible Materials |
| NFPA 55:2023 | Compressed Gases and Cryogenic Fluids Code |
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.