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| | | Process Environment | | |
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| | | Hazardous Area Descriptions | | |
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| | | National Electrical Code (NEC) 500 Traditional standards used in North America. | | |
| | | Example: Permitted Class_ Permitted Division_ Permitted Group_ Temperature Class | | |
| | | Class I, Div 1, Group B, C, D, T4 | | |
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| | | Permitted Group Group A: Acetylene Group B: Hydrogen or Equivalents Group C: Ethyl Ether, Ethylene or Cylclopropane Group D: Gasoline, hexane, naphtha, benzene, butane, propane, alcohol, acetone, benzol, lacquer, and natural gas Group E: Metal Dust Group F: Carbon Black Group G: Flour, starch, grain dusts | | Temperature Class* | | |
| | | Permitted Class Class I: Gas Vapors Class II: Dusts Class III: Fibers | | |
| | | Permitted Division Division 1: Gasses or vapors exist under normal conditions Division 2: Gasses or vapors are present but are normally contained and can escape only through accident or abnormal operation | | |
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| | | T1: T2: T3: T4: T5: T6: | | 450°C (842°F) 300°C (572°F) 200°C (392°F) 135°C (275°F) 100°C (212°F) 85°C (185°F) | | |
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| | | * Device may be exposed to gases whose ignition temperature is higher than this value. | | |
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| | | National Electrical Code (NEC) 505 North American Standards developed to harmonize with IEC standards. | | |
| | | Example: Permitted Class Permitted Zone | | Class I, Zone 1, AEx d [ia] HC T4 | | |
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| | | Method of Protection_ Intrinsically Safe Output-Gas Group- | | |
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| | | Temperature Class. | | |
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| | | Gas Group IIC: Acetylene IIB + H2: Hydrogen or equivalents IIB: Ethyl Ether, Ethylene or Cylclopropane IIA: Gasoline, hexane, naphtha, benzine, butane, propane, alcohol, acetone, benzol, lacquer, and natural gas | | |
| | | Protection Method e: Increased Safety: no arcs sparks or hot surfaces d*: Flame proof: contain explosion and quench flame m: Encapsulation, Zone 1: keep flammable gas out nA:Nonsparking equipment nC: Sparking equipment in which the contacts are suitably protected other than by restricted breathing enclosure nR:Restricted breathing *[ia]: Intrinsically safe, Zone 0, 1, and 2 *[ib]: Intrinsically safe, Zone 1 and 2 | | |
| | | Permitted Class Class I: Gas Vapors Class II: Dusts Class III: Fibers | | |
| | | Permitted Zone Zone 0: Gas present continuously Zone 1: Gas present intermittently Zone 2: Gas present under abnormal operation | | |
| | | Temperature Class* | | |
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| | | T1: T2: T3: T4: T5: T6: | | 450°C (842°F) 300°C (572°F) 200°C (392°F) 135°C (275°F) 100°C (212°F) 85°C (185°F) | | |
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| | | * Device may be exposed to gases whose ignition temperature is higher than this value. | | |
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| | | 42 StoneL Corporation Phone: (218) 739-5774 • Toll-free: (800) 843-7866 • Website: www.stonel.com | | |
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