NFPA 499: Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas
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What is NFPA 499?
NFPA 499: Document Scope

1.1 Scope. 1.1.1* This recommended practice provides information on the classification of combustible dusts and of hazardous (classified) locations for electrical installations in chemical process areas and other areas where combustible dusts are produced or handled. A.1.1.1 This recommended practice addresses the application of the electrical equipment in a combustible dust atmosphere. It does not address the fugitive dusts in the facility and those potential hazards. While this document acknowledges that the dust accumulation on structural beams or within the facility is a hazard, this recommended practice addresses only dust accumulation on electrical equipment. 1.1.2 This recommended practice provides information on combustible dusts as it relates to the proper selection of electrical equipment in hazardous (classified) locations in accordance with NFPA 70, National Electrical Code. 1.1.3 The tables of selected combustible dusts contained in this document are not intended to be all-inclusive.

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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