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NFPA 497 2021

NFPA 497 2021

$80.71

NFPA 497: Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas

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NFPA 2021
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Stay on top of safety in chemical process, storage, and handling areas with the updated NFPA 497, 2021 edition. The release of flammable, combustible substances into an atmosphere with electrical systems or equipment can result in a potentially deadly and destructive incident. NFPA 497, Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, delivers broad-based requirements for better safeguarding locations that handle these substances. This vital safety document offers recommended practices that provide a basic understanding of parameters used to classify the extent of a hazardous location. You get criteria for assessing ignitability hazards in chemical process areas, as well as provisions for selecting the appropriate electrical systems and equipment for optimal safety. NFPA 497 is a must-have guideline for: Installers and maintainers of electrical equipment located in or near areas where flammable or combustible liquids or flammable gases or vapors are present Equipment manufacturers providing equipment suitable for use in applicable electrically classified areas Design engineers, consultants, loss prevention or safety engineers, insurance professionals, enforcing officials, and owners/operators of industrial facilities The revised NFPA 497 is updated to reflect current industry knowledge and remain consistent with related codes and standards. The 2021 edition of these recommended practices work in conjunction with NFPA 70, National Electrical Code® (NEC®), to factor ignitability hazards and relevant electrical systems and components. Additional notable changes for 2021 include: A revised Table 4.4.2 to update chemical and physical property data based on the Design Institute for Physical Properties (DIPPR) database Updated Table 4.4.3 to correlate with Table 4.4.2 Be prepared to meet minimum safety requirements for areas using ignitible gases and liquids.

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 Relationship to NFPA Codes and Standards.
Chapter 2 Referenced Publications
2.1 General.
2.2 NFPA Publications.
9 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 Classification of Combustible Materials
4.1 National Electrical Code Criteria.
4.2 Behavior of Class I (Combustible Material) Gases, Vapors, and Liquids.
11 4.3 Conditions Necessary for Ignition.
4.4 Classification of Class I Combustible Materials.
18 Chapter 5 Classification of Class I (Combustible Material) Areas
5.1 National Electrical Code (NEC).
19 5.2 General.
5.3 Class, Division, Classified Locations.
20 5.4 Class I, Zone Classified Locations.
5.5 Unclassified Locations.
21 5.6 Extent of Classified Locations.
5.7 Discussion of Diagrams and Recommendations.
22 5.8 Basis for Recommendations.
5.9 Procedure for Classifying Locations.
23 5.10 Classification Diagrams for Class I, Divisions.
39 5.11 Classification Diagrams for Class I, Zones.
67 Annex A Explanatory Material
69 Annex B Example of a Method for Determining NEC Group Classification for Mixtures
72 Annex C Informational References

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NFPA 497 2021
$80.71