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| Class I - Gases or Vapors
Division 1 Division 2 Groups for both |
Class II - Dust Division 1 Division 2 Groups for both |
Class III - Fibers
Division 1 Division 2 No Groups for Class III Atmospheres containing textile, wood or synthetic fibers |
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Group Specifics
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| Group A acetylene Group B acrolein (inhibited) (2) arsine butadiene (1) ethylene oxide (2) hydrogen manufactured gases containing more than 30% hydrogen (by volume) propylene oxide (2) propylnitrate Group C acetaldehyde allyl alcohol n-butyraidehyde carbon monoxide crotonaldehyde cyclopropane diethyl ether diethylamine epichlorohydrin ethylene ethylenimine ethyl mercaptan ethyl sulfide hydrogen cyanide hydrogen sulfide morpholine 2-nitropropane tetrahydrofuran unsymmetrical dimethyl hydrazine (UDMH 1, 1-dimethyl hydrazine) |
Group D acetic acid (glacial) acetone acrylonitrile ammonia (3) benzene butane 1-butanol (butyl alcohol) 2-butanol (secondary butyl alcohol) n-butyl acetate isobutyl acetate di-isobutylene ethane ethanol (ethyl alcohol) ethyl acetate ethyl acrylate (inhibited) ethylene diamine (anhydrous) ethylene dichloride ethylene glycol monomethyl ether gasoline heptanes hexanes isoprene isopropyl ether mesityl oxide methane (natural gas) methanol (methyl alcohol) 3-methyl-1 butanol (isoamyl alcohol) methyl ethyl ketone methyl isobutyl ketone |
Group D (cont'd) 2-methyl-1 -propanol (isobutyl alcohol) 2-methyl-2-propanol (tertiary butyl alcohol) petroleum naphtha (4) pyridine octanes pentanes 1-pentanol (amyl alcohol) propane 1-propanol (propyl alcohol) 2-propanol (isopropyl alcohol) propylene styrene toluene vinyl acetate vinyl chloride xylenes Group E containing metal dust, including aluminum, magnesium, and their commercial alloys, and other metals of similarly hazardous characteristics. Group F containing carbon black, coal or coke dust. Group G containing flour, starch or grain dust. |
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| (1) Group D equipment shall be
permitted for this atmosphere if such equipment is isolated in accordance with Section
501-5(a) of National Electric Code by sealing all conduit 1/2 inch size or larger. (2) Group C equipment shall be permitted for this atmosphere if such equipment is isolated in accordance with Section 501-5(a) of National Electric Code by sealing all conduit 1/2-inch size or larger. |
For classification of areas involving ammonia atmosphere, (3) See Safety Code for Mechanical Refrigeration (ANSI/ASHRAE 15-1978) and Safety Requirements for the Storage and Handling of Anhydrous Ammonia (ANSI/CGA G2.1-1972). (4) A saturated hydrocarbon mixture boiling in the range 20-135 -C (68-275 -F). Also known by the synonyms benzine, ligroin, petroleum ether, or naphtha. |
| Compliances: Adalet explosion proof products are designed to fulfill the applicable Underwriters' Laboratories and Canadian Standards requirements and National Electrical Code Article 500 Hazardous (Classified) Location installations. Where statement of compliances is used in this catalog in reference to UL, CSA or FM listed standards number. it is for identification of products shown in catalog having met design criteria and company tested. (The statement of compliances does not imply that the products have been approved by Underwriters' Laboratories, Canadian Standards Association or Factory Mutual.) Such approvals are covered by listing published by Underwriters' Laboratories, Canadian Standards Association and Factory Mutual and are available upon request. *Taken from NFPA 497M-1983. |
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