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

The 2008 NFPA 497is your must-have resource for safe and accurate hazardous (classified) area classification in Class I hazardous (classified) locations.

Stay up-to-date in order to properly select and install electrical equipment and keep it well protected so that it will not be an ignition source in environments where flammable or combustible liquids, gases, or vapors are processed or handled. (Softbound, 63 pp., 2008)

NFPA 497: Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas contains critical information and many important changes that keep you up to date with current safety code requirements. These revisions reflect information contained in the 2008 NEC®, and include:

• 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