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NFPA 497M: Manual for Classification of Gases Vapors and Dusts for Electrical Equipment in Hazardous (Classified) Locations - Other Prior Editions

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DescriptionOther Prior Editions
EditionEdition Notes
1983ANSI approved See NFPA 70-1978 Article 500 for prior history of extensive lists of gases vapors and dusts and their group classifications as recommended by the National Materials Advisory Board of the National Academy of SciencesAdd
1986Add
1991ANSI approved Withdrawn at NFPA 1997 Annual Meeting Parts of incorporated into NFPA 497 and NFPA 499 in 1997Add

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