NFPA 499:2021
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas
Hardcopy
31-05-2023
English
04-04-2020
Chapter 1 Administration1.1 Scope. 1.2 Purpose.1.3 Application. 1.4 Relationship to NFPA Codes and Standards. Chapter 2 Referenced Publications2.1 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 Combustible Dusts 4.1 General.4.2 Combustible Dust Testing.4.3 Additional Potential Combustible Dust Hazards.4.4 Classification of Combustible Dusts. 4.5 Hybrid Mixtures.4.6 Electrostatic Discharges.4.7 Ignition Criteria. Chapter 5 National Electrical Code (NEC) Criteria 5.1 Classification of Class II Hazardous Locations and National Electrical Code (NEC) Criteria.5.2 Classification of Combustible Dusts. 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.6.4 Combustible Dust, Class II, Division 2 or Zone 22, Classified Locations. 6.5 Unclassified Locations. 6.6 Procedure for Classifying Areas. 6.7 Housekeeping.6.8 Extent of Hazardous (Classified) Locations. 6.9 Discussion of Diagrams and Recommendations. 6.10 Classification Diagrams. Annex A Explanatory Material Annex B Informational References
Important note : All end users must be registered with an Account prior to user licenses being assigned.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.