توضیحات :
NFPA 499 – Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas
۲۰۲۱ Edition
Chapter 1 Administration
۱-۱ Scope.
۱-۱-۱* 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.
۱-۱-۲ 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®.
۱-۱-۳ The tables of selected combustible dusts contained in this document are not intended to be all-inclusive.
۱-۲ Purpose.
۱-۲-۱ The purpose of this recommended practice is to provide the user with a basic understanding of the parameters that determine the degree and the extent of the hazardous (classified) location. This recommended practice also provides the user with examples of the applications of these parameters.
۱-۲-۲ This recommended practice is intended as a guide and should be applied with sound engineering judgment. Where all factors are properly evaluated, a consistent area classification scheme can be developed.
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