AGA XF0277 : 1992

SECTION 1 - GENERAL
   1.1 Introduction
   1.2 Scope
SECTION 2 - THE NATIONAL ELECTRICAL CODE
   2.1 National Electrical Code Considerations
   2.2 Classes and Divisions
   2.3 Division 1 Design Considerations
   2.4 Division 2 Design Considerations
SECTION 3 - CONDITIONS NECESSARY FOR IGNITION
   3.1 Basic Conditions
   3.2 Dispersion
SECTION 4 - DETERMINATION OF THE EXISTENCE OF A CLASSIFIED
            LOCATION
   4.1 General
   4.2 Flammable Gases and Vapors
   4.3 Flammable Liquids
   4.4 Flammable Gases, Vapors, and Liquids in the
       Atmosphere
   4.5 Area of Release
SECTION 5 - DETERMINATION OF THE DEGREE OF CLASSIFICATION
   5.1 Division 1 vs. Division 2
   5.2 Ventilation
SECTION 6 - DETERMINATION OF THE EXTENT OF THE CLASSIFIED
            LOCATION
   6.1 Extent of Classified Area for Flammable Gases
   6.2 Air Currents
   6.3 Transition Zones
   6.4 Probability of Failures
   6.5 Vapor Tight Barriers
SECTION 7 - RECOMMENDED METHODS FOR DETERMINING CLASSIFIED
            LOCATIONS
   7.1 Procedures
APPENDIX A - CHARACTERISTICS OF FLAMMABLE GASES, VAPORS,
             AND LIQUIDS
APPENDIX B - VENTILATION CALCULATIONS
APPENDIX C - INDEX OF CLASSIFICATION DIAGRAMS