Historical
NFPA 497-2008
NFPA 497: Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2008 Edition
Trust the 2008 NFPA 497 to help you perform accurate hazardous (classified) area classification in Class I hazardous (classified) locations.
NFPA 497: Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas has a close relationship to the electrical installation requirements for hazardous (classified) locations contained in NFPA 70™: National Electrical Code®. To ensure correlation with revisions made to the 2008 NEC®, the 2008 NFPA 497 now includes:
Changes to the scope to specify that explosives, pyrotechnics, and blasting agents have unique hazards that are not addressed by the recommendations of the document
Recognition of areas as being unclassified where the gas or vapor concentration is insufficient to reach 25% of the lower flammable limit (LFL)
Additions and revisions to Table 4.4.2 on physical properties of selected chemicals in order to provide information on commonly used materials not previously covered and to resolve differences that existed between this table and similar information contained in other documents
Revision to the Annex B example on determining the maximum experimental safe gap and NEC group classification for mixtures
Make sure you have the up-to-date knowledge you need to properly select and install electrical equipment so it will not be an ignition source in environments where flammable or combustible liquids, gases, or vapors are processed or handled. Order the 2008 NFPA 497 today. (Softbound, Approx. 62 pp., 2008)
National Fire Protection Association [nfpa]