Hazardous Area Installation
North American Hazardous Area Installation Definitions
This section provides hazardous area installation definitions for North
America to assist in determining the operating environment for the
instrument. Refer to the National Electrical Code (NEC) Article 500 for
more information on hazardous area definitions for North America.
North American
Hazardous Area
Installation
Definitions
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Class I: Highly flammable gases or vapors
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Class II: Combustible dust
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Class III: Combustible fibers or flyings
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Division 1: Intermittent or continuous hazard
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Division 2: Hazard under abnormal conditions
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Group A: Atmospheres containing acetylene
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Group B: Atmospheres containing hydrogen or gases of equivalent
hazard
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Group C: Atmospheres containing ethyl-ether vapors, ethylene or
cyclopropane
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Group D: Atmospheres containing gasoline, hexane, benzene, butane,
propane, alcohols, acetone, benzol, lacquer solvent vapors, or natural
gas
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Group E: Atmospheres containing metal dust
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Group F: Atmospheres containing coal dust
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Group G: Atmospheres containing grain dust
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NEMA 4X: Watertight enclosures, must pass hose test using 1-inch
nozzle delivering 65 gal/min at a 10-ft distance for 5 minutes;
additional corrosion-resistant characteristics, having no exposed metal
surfaces
●
NEMA 7: Explosion proof enclosures for indoor hazardous locations
(Class I, Groups A, B, C, D)
8-6
DCT6088 User Guide
Thermo Fisher Scientific
Summary of Contents for DCT6088
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