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Tel.: +86 574 6222 6513
Three Major Factors Causing Explosion
| Classification of Divisions and Zones | |||||||||
| ATEX & IECEX Classification | Definition of Zone or Division | North American Classification | |||||||
| Zone 0 (gases) | An area in which an explosive mixture is continuously present or for long periods or frequently ( ≥ 1000 hours / year). | Class I Division 1 (gases) | |||||||
| Zone 20 (dusts) | Class II Division 1 (dusts) | ||||||||
| Zone 1 (gases) | An area in which an explosive mixture is likely to occur during normal oerpations. (10-1000 hours / year). | Class I Division 1 (gases) | |||||||
| Zone 21 (dusts) | Class II Division 1 (dusts) | ||||||||
| Zone 2 (gases) | An area in which an explosive mixture is not likely to occur during normal oerpations but may occur for short periods (≤ 10 hours / year). | Class I Division 2 (gases) | |||||||
| Zone 22 (dusts) | Class II Division 2 (dusts) | ||||||||
Dagerous Level: Zone 0 > Zone 1 > Zone 2;
DivIsion 1 > Division 2
| Atmosphere Groups | |||||||
| Substance | Hazard Class | Division Groups | Zone Groups | ||||
| Acetylene | Class I Flammable Gases | Group A | IIC | ||||
| Hydrogen | Group B | IIB + H2 | |||||
| Ethylene | Group C | IIB | |||||
| Propane | Group D | IIA | |||||
| Methane | Group D | IIA6 | |||||
| Combustible Metal Dusts | Class II Combustible Dusts | Group E | IIIC | ||||
| Combustible Carbonaceous Dusts | Group F | IIIB | |||||
| Combustible Dust not in Group E or F (Fluor, Grain, Wood Plastics, Chemicals) | Group G | IIIB | |||||
| Combustibel Fibers and Flyings | Class III Fibers and Flyings | Not Applicable | IIIA | ||||
Dangerous Level: Class I > Cllas II > Calls III
| Temperature Classification | ||
| Max.Surface Temperature | NEC 500/CEC | NEC 505/IEC-Group II |
| 450℃ (842°F) | T1 | T1 |
| 300℃ (572°F) | T2 | T2 |
| 280℃ (536°F) | T2A | |
| 260℃ (500°F) | T2B | |
| 230℃ (446°F) | T2C | |
| 215℃ (419°F) | T2D | |
| 200℃ (392°F) | T3 | T3 |
| 180℃ (356°F) | T3A | |
| 165℃ (329°F) | T3B | |
| 160℃ (320°F) | T3C | |
| 135℃ (275°F) | T4 | T4 |
| 120℃ (248°F) | T4A | |
| 100℃ (212°F) | T5 | T5 |
| 85℃ (185°F) | T6 | T6 |
| Equipment Categories & Protection Levels | ||
| ATEX Category | Equipment Protection Level | Typical Equipment Zone Suitability |
| 1G | Ga | Zones 0, 1, 2 |
| 1D | Da | Zones 20, 21, 22 |
| 2G | Gb | Zones 1, 2 |
| 2D | Db | Zones 21, 22 |
| 3G | Gc | Zones 2 |
| 3D | Dc | Zones 22 |
| M1 | Ma | Very high level of protection for mines |
| M2 | Mb | High level of protection for mines |
| ATEX Categories VS Zones of Use | ||
| Equipment Category ATEX 2014/34/EU | Zone of Use | |
| Gas,Vapors & Mist | Dust | |
| Category 1 | Zone 0, 1, 2 | Zone 20, 21, 22 |
| Category 2 | Zone 1, 2 | Zone 21, 22 |
| Category 3 | Zone 2 | Zone 22 |
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