Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas
What is NFPA 499?
This recommended practice presents criteria to determine ignitability hazards in chemical process areas where combustible dusts are produced, processed, or handled to assist in the selection of electrical systems and equipment for safe use in Class II hazardous (classified) locations.
Official document scope
What does NFPA 499 address?
Data is provided on the classification of combustible dusts and hazardous (classified) locations for electrical installations as it relates to the proper selection of electrical equipment in such locations in accordance with NFPA 70: National Electrical Code. Coverage includes extensive data on physical properties of selected combustible dusts, including specific Class II, division, and dust group information.
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