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This Recommended Practice is a vital first step for the selection of electrical systems and equipment for safe use in Class II hazardous (classified) locations in accordance with the NEC®.

Up-to-date with NFPA 70®: National Electrical Code®, the 2017 edition of NFPA 499: Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas presents criteria to determine ignitability hazards in chemical process areas where combustible dusts are produced, processed, or handled.

Make sure you can properly select and install electrical systems and equipment for safe use in Class II hazardous (classified) locations.

Filled with detailed guidelines and diagrams, NFPA 499 also provides extensive data on physical properties of selected combustible dusts, including specific Class II, Division, and dust group information.

The 2017 edition of NFPA 499 is revised for:
  • Greater consistency between the figures and text regarding a transitional classified location around doorways
  • Alignment with the 2017 edition of the NEC -- including addition of the zone classification system
It's an important tool for anyone who performs hazardous (classified) area classification.

NFPA 499 is used by facility operators and installers and maintainers of industrial equipment using electrical power that is to be located in or near areas where combustible dusts are produced, used, or handled; equipment manufacturers providing equipment suitable for use in such electrically classified areas; design engineers/consultants; and loss prevention or safety engineers. Insurance professionals, enforcing officials, and owner/operators of industrial facilities also need to stay up-to-date with the latest edition.
 

Document History

  1. NFPA (Fire) 499

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    Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2017 Edition

    • Most Recent
  2. NFPA (Fire) 499


    Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2013 Edition

    • Historical Version
  3. NFPA (Fire) 499


    Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2008 Edition

    • Historical Version
  4. NFPA (Fire) 499


    Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2004 Edition

    • Historical Version