497: Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas
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Stay on Top of Safety in Chemical Process, Storage, and Handling Areas
The release of flammable and combustible substances in areas with electrical systems or equipment can result in a potentially destructive incident. 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, delivers broad-based requirements for better safeguarding locations that handle these substances.
This vital safety document offers criteria for assessing ignitability hazards in chemical process areas, provisions for selecting the appropriate electrical systems and equipment for optimal safety, and parameters used to classify the extent of a hazardous location.
The 2024 edition features changes that include:
- Adding the definition for hazardous (classified) location from NFPA 70®, National Electrical Code®
- Adding two new figures to establish classification areas around pressure relief valve vents
- Removing the classification areas of the sources in several figures in Section 5.11 to eliminate confusion
