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Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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RECOMMENDED PRACTICE FOR THE CLASSIFICATION OF CLASS II HAZARDOUS (CLASSIFIED) LOCATIONS FOR ELECTRICAL INSTALLATIONS IN CHEMICAL PROCESS AREAS
01-09-1997
12-01-2013
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
Provides a basic understanding for determining the degree and extent of hazardous (classified) locations for combustible dusts as described in Article 500 of NFPA 70.
| DocumentType |
Standard
|
| PublisherName |
National Fire Protection Association
|
| Status |
Superseded
|
| SupersededBy |
| NFPA 65 : 1993 | PROCESSING AND FINISHING OF ALUMINUM |
| NFPA 36 : 2017 | SOLVENT EXTRACTION PLANTS |
| NFPA 654 : 2017 | PREVENTION OF FIRE AND DUST EXPLOSIONS FROM THE MANUFACTURING, PROCESSING, AND HANDLING OF COMBUSTIBLE PARTICULATE SOLIDS |
| NFPA 69 : 2014 | EXPLOSION PREVENTION SYSTEMS |
| NFPA 650 : 1998 | PNEUMATIC CONVEYING SYSTEMS FOR HANDLING COMBUSTIBLE PARTICULATE SOLIDS |
| NFPA 85F : 1988 | INSTALLATION AND OPERATION OF PULVERIZED FUEL SYSTEMS |
| NFPA 664 : 2017 | PREVENTION OF FIRES AND EXPLOSIONS IN WOOD PROCESSING AND WOODWORKING FACILITIES |
| NFPA 68 : 2013 | EXPLOSION PROTECTION BY DEFLAGRATION VENTING |
| NFPA 61C : 1989 | PREVENTION OF FIRE AND DUST EXPLOSION IN FEED MILLS |
| NFPA 70 : 2017 | NATIONAL ELECTRICAL CODE |
| NFPA 61A : 1989 | PREVENTION OF FIRE AND DUST EXPLOSIONS IN FACILITIES MANUFACTURING AND HANDLING STARCH |
| NFPA 1985E : 1985 | PREVENTION OF FURNACE EXPLOSIONS IN PULVERIZED COAL FIRED MULTIPLE BURNER BOILER FURNACES |
| NFPA 651 : 1998 | MACHINING AND FINISHING OF ALUMINUM AND THE PRODUCTION AND HANDLING ALUMINUM POWDERS |
| NFPA 61D : 1989 | PREVENTION OF FIRE AND DUST EXPLOSIONS IN THE MILLING OF AGRICULTURAL COMMODITIES FOR HUMAN CONSUMPTION |
| NFPA 61B : 1989 | PREVENTION OF FIRES AND EXPLOSIONS IN GRAIN ELEVATORS AND FACILITIES HANDLING BULK RAW AGRICULTURAL COMMODITIES |
| NFPA 655 : 2017 | PREVENTION OF SULFUR FIRES AND EXPLOSIONS |
| NFPA 497M : 1991 | CLASSIFICATION OF GASES, VAPORS AND DUSTS FOR ELECTRICAL EQUIPMENT IN HAZARDOUS (CLASSIFIED) LOCATIONS |
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