NFPA 497:2027
Current
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
Published date
06-05-2026
Publisher
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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
|
| PublisherName |
National Fire Protection Association
|
| Status |
Current
|
| Supersedes |
| NFPA 59A:2023 | Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG) |
| API RP 500:2023 | Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2 |
| ASTM D 323 : 2026 | Standard Test Method for Vapor Pressure of Petroleum Products (Reid Method) |
| NFPA 30:2024 | Flammable and Combustible Liquids Code |
| NFPA 55:2020 | Compressed Gases and Cryogenic Fluids Code |
Frequently Asked Questions
NFPA 497 is National Fire Protection Association (NFPA)'s standard for specialised fire and life safety, while NFPA 24:2022 covers specialised fire and life safety (United States). NFPA 497 provides fire protection, electrical safety or hazard-control requirements for the specialised system or facility identified by the NFPA document. NFPA 24:2022 provides fire protection, electrical safety or hazard-control requirements for the specialised system or facility identified by the NFPA document. It supports consistent specification, verification and documented acceptance across the relevant lifecycle.
NFPA 497 provides fire protection, electrical safety or hazard-control requirements for the specialised system or facility identified by the NFPA document. In practice it is applied by designers, operators and authorities applying the nominated NFPA code or standard to relevant facilities and systems.
No — NFPA 497 is a United States standard published by National Fire Protection Association (NFPA), with its listed region as United States.
NFPA 497 provides fire protection, electrical safety or hazard-control requirements for the specialised system or facility identified by the NFPA document. It is a United States standard published by National Fire Protection Association (NFPA).
NFPA 497 is used by designers, operators and authorities applying the nominated NFPA code or standard to relevant facilities and systems. It is a United States standard published by National Fire Protection Association (NFPA).
Summarise
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