NFPA 497B : 1991
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
09-01-1997
01-12-2013
Chapter 1 General
1.1 Scope
1.2 Purpose
1.3 National Electrical Code (NEC)
1.4 NFPA 497M
Chapter 2 Basic considerations
2.1 National Electrical Code criteria
2.2 Conditions necessary for ignition
2.3 Behavior of dusts
2.4 Classification of dusts
2.5 Ignition of dust clouds
2.6 Ignition of dust layers
Chapter 3 Degree of hazard for Group F and G dusts
3.1 Dust layer thickness
3.2 Optimum concentration criteria
3.3 Division 1 classified location
3.4 Division 2 classified location
3.5 Nonclassified locations
Chapter 4 Extent of classified locations
4.1 Extent of classified locations
Chapter 5 Determining the degree and extent of
hazardous (classified) locations
5.1 Diagrams and recommendations
5.2 Procedure for classifying locations
5.3 Index of classification diagrams
Chapter 6 Referenced publications
Appendix A
Appendix B Referenced publications
Index
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