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NFPA 499 2024

NFPA 499 2024

$62.08

NFPA 499: Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas

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NFPA 2024
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Help ensure you and your team have the most current knowledge on selecting and installing electrical systems and equipment for safe use in locations classified as hazardous with NFPA 499, 2021 edition. The presence of combustible dusts in industrial settings where electrical systems and equipment are used represents a significant ignition hazard. NFPA 499, Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, provides guidance for selecting electrical systems for safe use in Class II hazardous (classified) locations in accordance with relevant codes and standards. This essential safety document delivers criteria for designating classified areas where combustible dusts are produced, processed, or handled. NFPA 499 is a must-have for: Anyone responsible for hazardous area classification in industrial facilities Facility operators, installers, and maintainers of electrical equipment used in areas where combustible dusts are present Owners or operators of industrial facilities, insurance professionals, AHJs, and enforcing officials Manufacturers of equipment for use in electrically classified process areas Design engineers/consultants, loss prevention or safety engineers The 2021 edition is updated for consistency with NFPA 70®, National Electrical Code®, 2020 edition, and the latest accepted practices in the chemical process industries. This recommended practice offers detailed guidelines, classification diagrams, and dust group classifications on an extensive list of combustible dusts. Revisions to the 2021 edition include: Updated definition of combustible flyings to combustible fibers/flyings; added definition for ignitible fibers/flyings; and clarification of the classification of combustible fibers/flyings [These changes help ensure that material posing a flash-fire or explosion hazard is evaluated as hazardous (classified) locations regardless of particle size] Inclusion of classification for portable electronic products (PEPs) to correlate with UL 121203, Portable Electronic Products Suitable for Use in Class I and II, Division 2, Class I, Zone 2 and Class III, Division 1 and 2 Hazardous (Classified) Locations Edited area electrical classifications throughout the document to correlate with the NEC® electrical classification

PDF Catalog

PDF Pages PDF Title
2 Important Notices and Disclaimers
3 Additional Important Notices and Disclaimers
8 Chapter 1 Administration
1.1 Scope.
1.2 Purpose.
1.3 Application.
1.4 Relationship to NFPA Codes and Standards.
9 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.
10 Chapter 4 Combustible Dusts
4.1 General.
4.2 Combustible DustCombustibility and Explosibility Testing.
12 4.3 Additional Potential Combustible Dust Hazards.
4.4 Hybrid Mixtures.
4.5 Electrostatic Discharges.
4.6 Ignition Criteria.
Chapter 5 National Electrical Code (NEC) Criteria
5.1 Classification of Class II Hazardous Locations and National Electrical Code (NEC) Criteria.
14 5.2 Classification of Combustible Dusts.
21 Chapter 6 Classification of Combustible Dust Locations
6.1 General.
6.2 Conditions Necessary for Ignition of Combustible Dust.
6.3 Class II, Division 1 or Zone 20/Zone 21 Classified Locations.
22 6.4 Combustible Dust, Class II, Division 2 or Zone 22, Classified Locations.
6.5 Unclassified Locations.
6.6 Procedure for Classifying Areas.
23 6.7 Housekeeping.
6.8 Extent of Hazardous (Classified) Locations.
24 6.9 Discussion of Diagrams and Recommendations.
6.10 Classification Diagrams.
33 Annex A Explanatory Material
37 Annex B Informational References

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NFPA 499 2024
$62.08