• NFPA 497 : 2017

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    CLASSIFICATION OF FLAMMABLE LIQUIDS, GASES, OR VAPORS AND OF HAZARDOUS (CLASSIFIED) LOCATIONS FOR ELECTRICAL INSTALLATIONS IN CHEMICAL PROCESS AREAS

    Available format(s):  Hardcopy

    Superseded date:  16-08-2021

    Language(s):  English

    Published date:  01-01-2017

    Publisher:  National Fire Protection Association

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    Table of Contents - (Show below) - (Hide below)

    Chapter 1 - Administration
    Chapter 2 - Referenced Publications
    Chapter 3 - Definitions
    Chapter 4 - Classification of Combustible Materials
    Chapter 5 - Classification of Class I (Combustible Material) Areas
    Annex A - Explanatory Material
    Annex B - Example of a Method for Determining
              NEC Group Classification for Mixtures
    Annex C - Informational References
    Index

    Abstract - (Show below) - (Hide below)

    Gives information on specific flammable gases and vapors, flammable liquids, and combustible liquids whose relevant combustion properties have been sufficiently identified to allow their classification into the groups established by NFPA 70 (NEC), for proper selection of electrical equipment in hazardous (classified) locations.

    General Product Information - (Show below) - (Hide below)

    Development Note Formerly NFPA 497A and part of NFPA 497M. (06/2001) 2012 version is also available in Spanish; See NFPA 497 SPANISH. (12/2014)
    Document Type Standard
    Publisher National Fire Protection Association
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    IEEE 303-2004 IEEE Recommended Practice for Auxiliary Devices for Rotating Electrical Machines in Class I, Division 2 and Zone 2 Locations
    BS ISO 16924 : 2016 NATURAL GAS FUELLING STATIONS - LNG STATIONS FOR FUELLING VEHICLES
    BS EN ISO 16852:2010 Flame arresters. Performance requirements, test methods and limits for use
    13/30279579 DC : 0 BS ISO 19372 - MICROTURBINES APPLICATIONS - SAFETY
    ANSI/AIHA/ASSP Z9.9-2010 PORTABLE VENTILATION SYSTEMS
    IEEE 3004.8-2016 IEEE Recommended Practice for Motor Protection in Industrial and Commercial Power Systems
    ANSI FC 1 : 2012 STATIONARY FUEL CELL POWER SYSTEMS
    API 500A : 4ED 82(R1987) CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS IN PETROLEUM REFINERIES
    SAE J 2645 : 2018 LIQUEFIED NATURAL GAS (LNG) VEHICLE METERING AND DISPENSING SYSTEMS - TRUCK AND BUS
    SAE J 2851 : 2015 RECOVERY EQUIPMENT FOR CONTAMINATED R-134A OR R-1234YF REFRIGERANT FROM MOBILE AUTOMOTIVE AIR CONDITIONING SYSTEMS
    NFPA 318 : 2018 PROTECTION OF SEMICONDUCTOR FABRICATION FACILITIES
    NFPA 30 : 2018 FLAMMABLE AND COMBUSTIBLE LIQUIDS CODE
    NFPA 30A : 2018 MOTOR FUEL DISPENSING FACILITIES AND REPAIR GARAGES
    NFPA 505 : 2018 FIRE SAFETY STANDARD FOR POWERED INDUSTRIAL TRUCKS INCLUDING TYPE DESIGNATIONS, AREAS OF USE, CONVERSIONS, MAINTENANCE, AND OPERATIONS
    NFPA 51A : 2012 ACETYLENE CYLINDER CHARGING PLANTS
    NFPA 35 : 2016 MANUFACTURE OF ORGANIC COATINGS
    NFPA 87 : 2018 FLUID HEATERS
    NFPA 496 : 2017 PURGED AND PRESSURIZED ENCLOSURES FOR ELECTRICAL EQUIPMENT
    NFPA 850 : 2015 FIRE PROTECTION FOR ELECTRIC GENERATING PLANTS AND HIGH VOLTAGE DIRECT CURRENT CONVERTER STATIONS
    NFPA 59 : 2018 UTILITY LP-GAS PLANT CODE
    PIP ELCGL01 : 2013 ELECTRICAL DESIGN CRITERIA
    ANSI/CSA AMERICA FC 3-2004 (R2017) PORTABLE FUEL CELL POWER SYSTEMS
    CSA FC 3 : 2004 PORTABLE FUEL CELL POWER SYSTEMS
    ISA TR12.24.01 : 1998 RECOMMENDED PRACTICE FOR CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS CLASSIFIED AS CLASS 1, ZONE 0, ZONE 1, OR ZONE 2
    FM 3620 : 2018 PURGED AND PRESSURIZED ELECTRICAL EQUIPMENT FOR HAZARDOUS (CLASSIFIED) LOCATIONS
    14/30284759 DC : 0 BS EN ISO 16852 - FLAME ARRESTERS - PERFORMANCE REQUIREMENTS, TEST METHODS AND LIMITS FOR USE
    CSA PLUS 2203 : 2001 HAZARDOUS LOCATIONS - GUIDE FOR THE DESIGN, TESTING, CONSTRUCTION, AND INSTALLATION OF EQUIPMENT IN EXPLOSIVE ATMOSPHERES
    DIN EN ISO 16852:2010-09 FLAME ARRESTERS - PERFORMANCE REQUIREMENTS, TEST METHODS AND LIMITS FOR USE (ISO 16852:2016)
    API 625 : 2010 TANK SYSTEMS FOR REFRIGERATED LIQUEFIED GAS STORAGE
    ISA 12.13.01 : 2003 PERFORMANCE REQUIREMENTS FOR COMBUSTIBLE GAS DETECTORS
    ISA TR12.13.03 : 2009 GUIDE FOR COMBUSTIBLE GAS DETECTION AS A METHOD OF PROTECTION
    NFPA 30B : 2015 CODE FOR THE MANUFACTURE AND STORAGE OF AEROSOL PRODUCTS
    NFPA 651 : 1998 MACHINING AND FINISHING OF ALUMINUM AND THE PRODUCTION AND HANDLING ALUMINUM POWDERS
    SAE J 2578 : 2014 RECOMMENDED PRACTICE FOR GENERAL FUEL CELL VEHICLE SAFETY
    NFPA 664 : 2017 PREVENTION OF FIRES AND EXPLOSIONS IN WOOD PROCESSING AND WOODWORKING FACILITIES
    C22.1-15 PACKAGE Consists of C22.1-15, Canadian electrical code, part I (23rd edition), safety standard for electrical installations; C22.1HB-15, Canadian electrical code handbook - an explanation of rules of the Canadian electrical code, part I and the 2015 Electrical quick reference
    BS EN ISO 16924:2018 Natural gas fuelling stations. LNG stations for fuelling vehicles
    API 500 RUSSIAN :1997 RECOMMENDED PRACTICE FOR CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS AT PETROLEUM FACILITIES CLASSIFIED AS CLASS 1, DIVISION 1 AND DIVISION 2
    API 500 RUSSIAN : 1997 : R2002 RECOMMENDED PRACTICE FOR CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS AT PETROLEUM FACILITIES CLASSIFIED AS CLASS 1, DIVISION 1 AND DIVISION 2
    NFPA 2 : 2016 HYDROGEN TECHNOLOGIES CODE
    NFPA 52 : 2016 VEHICULAR NATURAL GAS FUEL SYSTEMS CODE
    NFPA 820 : 2016 FIRE PROTECTION IN WASTEWATER TREATMENT AND COLLECTION FACILITIES
    ISO 19859:2016 Gas turbine applications Requirements for power generation
    ANSI/CSA NGV 5.1-2016 (R2020) Residential fueling appliances
    NFPA 1 : 2021 FIRE CODE
    C22.1HB-18 Canadian Electrical Code Handbook - An Explanation of the Rules of the Canadian Electrical Code, Part I
    CSA NGV 5.1 : 2016 RESIDENTIAL FUELING APPLIANCES
    ISA 12.00.01 : 2002 ELECTRICAL APPARATUS FOR USE IN CLASS 1, ZONE 0, 1 AND 2 HAZARDOUS (CLASSIFIED) LOCATIONS - GENERAL REQUIREMENTS
    13/30271407 DC : DRAFT DEC 2013 BS ISO 16924 - NATURAL GAS FUELLING STATIONS - LNG STATIONS FOR FUELLING VEHICLES
    API 500C : 2ED 84(R1990) CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS AT PIPELINE TRANSPORTATION FACILITIES
    NFPA 8506 : 1998 HEAT RECOVERY STEAM GENERATOR SYSTEMS
    ICC 2012 INTERNATIONAL PERFORM. CODE : 2012 ICC PERFORMANCE CODE FOR BUILDINGS AND FACILITIES
    UNE-EN ISO 16852:2017 Flame arresters - Performance requirements, test methods and limits for use (ISO 16852:2016)
    BS ISO 21789:2009 Gas turbine applications — Safety
    ANSI/CSA FC 1:2014 FUEL CELL TECHNOLOGIES - PART 3-100: STATIONARY FUEL CELL POWER SYSTEMS - SAFETY
    ISA RP12.24.01 : 1998 RECOMMENDED PRACTICE FOR CLASSIFICATIONS OF LOCATIONS FOR ELECTRICAL INSTALLATIONS CLASSIFIED AS CLASS I ZONE 0, ZONE 1, OR ZONE 2
    API STD 541 : 2014 FORM-WOUND SQUIRREL CAGE INDUCTION MOTORS - 375 KW (500 HORSEPOWER) AND LARGER
    NFPA 69 : 2014 EXPLOSION PREVENTION SYSTEMS
    ISA 60079-29-2 : 2012 EXPLOSIVE ATMOSPHERES - PART 29-2: GAS DETECTORS - SELECTION, INSTALLATION, USE AND MAINTENANCE OF DETECTORS FOR FLAMMABLE GASES AND OXYGEN
    API 612 : 2014 PETROLEUM, PETROCHEMICAL, AND NATURAL GAS INDUSTRIES - STEAM TURBINES - SPECIAL-PURPOSE APPLICATIONS
    API 2610 : 2005 : R2010 DESIGN, CONSTRUCTION, OPERATION, MAINTENANCE, AND INSPECTION OF TERMINAL AND TANK FACILITIES
    ISO 19372:2015 Microturbines applications — Safety
    API 14F : 2008 : R2013 DESIGN, INSTALLATION, AND MAINTENANCE OF ELECTRICAL SYSTEMS FOR FIXED AND FLOATING OFFSHORE PETROLEUM FACILITIES FOR UNCLASSIFIED AND CLASS 1, DIVISION 1 AND DIVISION 2 LOCATIONS
    API 540 : 1999 : R2006 ELECTRICAL INSTALLATIONS IN PETROLEUM PROCESSING PLANTS
    NFPA 70 : 2017 NATIONAL ELECTRICAL CODE
    NFPA 55 : 2016 COMPRESSED GASES AND CRYOGENIC FLUIDS CODE
    ISO 21789:2009 Gas turbine applications — Safety
    IEEE 1635-2012 IEEE/ASHRAE Guide for the Ventilation and Thermal Management of Batteries for Stationary Applications
    NASA KSC E 165 : 2009 ELECTRICAL GROUND SUPPORT EQUIPMENT FABRICATION, SPECIFICATION FOR
    NASA KSC STD E 0002 : 2009 HAZARDPROOFING OF ELECTRICALLY ENERGIZED EQUIPMENT, STANDARD FOR
    ASHRAE GUIDELINE 21 : 2012 VENTILATION AND THERMAL MANAGEMENT OF BATTERIES FOR STATIONARY APPLICATIONS
    NASA STD 8719.24 : 2011 NASA EXPENDABLE LAUNCH VEHICLE PAYLOAD SAFETY REQUIREMENTS
    NASA KSC GP 864 VOL 2A : 2009 ELECTRICAL GROUND SUPPORT EQUIPMENT CABLE HANDBOOK
    API STD 612:2020 Petroleum, Petrochemical, and Natural Gas Industries - Steam Turbines - Special-purpose Applications
    CSA CE CODE SAFETY PACKAGE : 2012 CE CODE SAFETY PACKAGE
    C22.10-10 Québec Construction Code, Chapter V - Electricity Canadian Electrical Code, Part I (Twenty-first Edition) with Québec Amendments
    CSA C22.4 PACKAGE : 2009 CONSISTS OF C22.4 NO. 1-09, OBJECTIVE-BASED INDUSTRIAL ELECTRICAL CODE AND C22.4 NO. 2-09, OBJECTIVE-BASED INDUSTRIAL ELECTRICAL CODE - SAFETY MANAGEMENT SYSTEM REQUIREMENTS
    NFPA 85 : 2015 BOILER AND COMBUSTION SYSTEMS HAZARDS CODE
    04/30105027 DC : DRAFT JUNE 2004 ISO 21789 - GAS TURBINES - SAFETY
    SAE AS 6479 : 2014 SPLICER, FUSION, FIBER OPTIC, AEROSPACE
    API 546 : 2008 BRUSHLESS SYNCHRONOUS MACHINES - 500 KVA AND LARGER
    ISA TR12.21.01 : 2004 USE OF FIBER OPTIC SYSTEMS IN CLASS 1 HAZARDOUS (CLASSIFIED) LOCATIONS
    CSA/ANSI NGV 5.2-2017 Vehicle fueling appliances (VFA)
    ISA TR12.06.01 : 1999 ELECTRICAL EQUIPMENT IN A CLASS 1, DIVISION 2/ZONE 2 HAZARDOUS LOCATION
    API 505 : 1997 RECOMMENDED PRACTICE FOR CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS AT PETROLEUM FACILITIES CLASSIFIED AS CLASS I, ZONE 0, ZONE 1, AND ZONE 2
    API 14F:2008 DESIGN, INSTALLATION, AND MAINTENANCE OF ELECTRICAL SYSTEMS FOR FIXED AND FLOATING OFFSHORE PETROLEUM FACILITIES FOR UNCLASSIFIED AND CLASS 1, DIVISION 1 AND DIVISION 2 LOCATIONS
    API 540:1999 ELECTRICAL INSTALLATIONS IN PETROLEUM PROCESSING PLANTS
    API 2610:2005 DESIGN, CONSTRUCTION, OPERATION, MAINTENANCE, AND INSPECTION OF TERMINAL AND TANK FACILITIES
    I.S. EN ISO 16852:2016 FLAME ARRESTERS - PERFORMANCE REQUIREMENTS, TEST METHODS AND LIMITS FOR USE (ISO 16852:2016)
    13/30276640 DC : 0 BS EN 62282-4-101 ED 1.0 - FUEL CELL TECHNOLOGIES - PART 4-101: FUEL CELL POWER SYSTEMS FOR PROPULSION FOR OTHER THAN ROAD VEHICLES AND AUXILIARY POWER UNITS - FUEL CELL POWER SYSTEMS FOR ELECTRICALLY POWERED INDUSTRIAL TRUCKS - SAFETY
    ISO 16852:2016 Flame arresters Performance requirements, test methods and limits for use
    BS EN 62282-4-101:2014 Fuel cell technologies Fuel cell power systems for propulsion other than road vehicles and auxiliary power units (APU). Safety of electrically powered industrial trucks
    IEC 62282-4-101:2014 Fuel cell technologies - Part 4-101: Fuel cell power systems for propulsion other than road vehicles and auxiliary power units (APU) - Safety of electrically powered industrial trucks
    BS ISO 19372:2015 Microturbines applications. Safety
    BS ISO 19859:2016 Gas turbine applications. Requirements for power generation
    EI 1540 : 2014 DESIGN, CONSTRUCTION, COMMISSIONING, MAINTENANCE AND TESTING OF AVIATION FUELLING FACILITIES
    EI MODEL CODE SAFE PRACTICE PT7 : 1998 DESIGN, CONSTRUCTION, OPERATION AND MAINTENANCE OF AVIATION FUELLING FACILITIES
    ICC ICCPC INTERNATIONAL PERFORMANCE CODE : 2015 ICC PERFORMANCE CODE FOR BUILDINGS AND FACILITIES
    ISO 16924:2016 Natural gas fuelling stations — LNG stations for fuelling vehicles
    NFPA 484 : 2015 COMBUSTIBLE METALS
    IEEE 1349-2011 REDLINE IEEE Guide for Application of Electric Motors in Class I, Division 2 and Class I, Zone 2 Hazardous (Classified) Locations
    NFPA 350 : 2016 SAFE CONFINED SPACE ENTRY AND WORK
    CSA C22.4 No. 1 : 2009(R2018) OBJECTIVE-BASED INDUSTRIAL ELECTRICAL CODE
    API 2001 : 2012 FIRE PROTECTION IN REFINERIES
    API 14FZ : 2013 RECOMMENDED PRACTICE FOR DESIGN, INSTALLATION, AND MAINTENANCE OF ELECTRICAL SYSTEMS FOR FIXED AND FLOATING OFFSHORE PETROLEUM FACILITIES FOR UNCLASSIFIED AND CLASS 1, ZONE 0, ZONE 1, AND ZONE 2 LOCATIONS
    SAE J 3030 : 2015 AUTOMOTIVE REFRIGERANT RECOVERY/RECYCLING/RECHARGING EQUIPMENT INTENDED FOR USE WITH BOTH R-1234YF AND R-134A
    API 14F REDLINE : 2008 DESIGN, INSTALLATION, AND MAINTENANCE OF ELECTRICAL SYSTEMS FOR FIXED AND FLOATING OFFSHORE PETROLEUM FACILITIES FOR UNCLASSIFIED AND CLASS 1, DIVISION 1 AND DIVISION 2 LOCATIONS
    API 500 : 2012 RECOMMENDED PRACTICE FOR CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS AT PETROLEUM FACILITIES CLASSIFIED AS CLASS 1, DIVISION 1 AND DIVISION 2
    NFPA 1 : 2018 FIRE CODE
    C22.1-18 Canadian Electrical Code, Part I (24th Edition), Safety Standard for Electrical Installations
    14/30244780 DC : 0 BS ISO 19859 - GAS TURBINE APPLICATIONS - REQUIREMENTS FOR POWER GENERATION
    EN ISO 16852:2016 Flame arresters - Performance requirements, test methods and limits for use (ISO 16852:2016)
    EN 62282-4-101:2014 Fuel cell technologies - Part 4-101: Fuel cell power systems for propulsion other than road vehicles and auxiliary power units (APU) - Safety of electrically powered industrial trucks

    Standards Referencing This Book - (Show below) - (Hide below)

    API 500 : 2012 RECOMMENDED PRACTICE FOR CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS AT PETROLEUM FACILITIES CLASSIFIED AS CLASS 1, DIVISION 1 AND DIVISION 2
    NFPA 58 : 2017 LIQUEFIED PETROLEUM GAS CODE
    NFPA 34 : 2015 DIPPING, COATING, AND PRINTING PROCESSES USING FLAMMABLE OR COMBUSTIBLE LIQUIDS
    NFPA 36 : 2017 SOLVENT EXTRACTION PLANTS
    CGA G 2.1 : 2014 REQUIREMENTS FOR THE STORAGE AND HANDLING OF ANHYDROUS AMMONIA
    IEC 60079-20-1:2010 Explosive atmospheres - Part 20-1: Material characteristics for gas and vapour classification - Test methods and data
    NFPA 33 : 2016 SPRAY APPLICATION USING FLAMMABLE OR COMBUSTIBLE MATERIALS
    ISA RP12.12.03 : 2002 PORTABLE ELECTRONIC PRODUCTS SUITABLE FOR USE IN CLASS 1 AND 2, DIVISION 2, CLASS 1 ZONE 2 AND CLASS 3, DIVISION 1 AND 2 HAZARDOUS (CLASSIFIED) LOCATIONS
    NFPA 35 : 2016 MANUFACTURE OF ORGANIC COATINGS
    IEC 60079-11:2011 Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
    EI Model code of safe practice Part 15:2015 MODEL CODE OF SAFE PRACTICE - PART 15: AREA CLASSIFICATION FOR INSTALLATIONS HANDLING FLAMMABLE FLUIDS
    NFPA 55 : 2016 COMPRESSED GASES AND CRYOGENIC FLUIDS CODE
    API 505 : 1997 RECOMMENDED PRACTICE FOR CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS AT PETROLEUM FACILITIES CLASSIFIED AS CLASS I, ZONE 0, ZONE 1, AND ZONE 2
    ASHRAE 15 AND 34 PACKAGE : 2016 ASHRAE 15: SAFETY STANDARD FOR REFRIGERATION SYSTEMS - ASHRAE 34: DESIGNATION AND SAFETY CLASSIFICATION OF REFRIGERANTS
    NFPA 45 : 2015 FIRE PROTECTION FOR LABORATORIES USING CHEMICALS
    NFPA 70 : 2017 NATIONAL ELECTRICAL CODE
    ASTM D 93 : 2016-07 TEST METHODS FOR FLASH POINT BY PENSKY-MARTENS CLOSED CUP TESTER
    NFPA 59A : 2016 PRODUCTION, STORAGE, AND HANDLING OF LIQUEFIED NATURAL GAS (LNG)
    NFPA FIRE PROT GUIDE ON HAZARDOUS MAT : 2010 FIRE PROTECTION GUIDE TO HAZARDOUS MATERIALS
    NFPA 30 : 2018 FLAMMABLE AND COMBUSTIBLE LIQUIDS CODE
    ASTM E 659 : 2015 : REDLINE Standard Test Method for Autoignition Temperature of Chemicals
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