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Explosion-proof classification: The IIC level is the highest, encompassing the applications of IIB and IIA; IIB exceeds IIA in ranking.
| Class And Level | Ignition Temperature And Group | |||||
|---|---|---|---|---|---|---|
| - | T1 | T2 | T3 | T4 | T5 | T6 |
| - | T＞450 | 450≥T＞300 | 300≥T＞200 | 200≥T＞135 | 135≥T＞100 | 100≥T＞85 |
| IO | Metano | |||||
| IIA | Ethane, Propane, Acetone, Phenethyl, Ene, Aminobenzene, Toluene, Benzene, Ammonia, Monossido di carbonio, Ethyl Acetate, Acetic Acid | Butano, Ethanol, Propylene, Butanol, Acetic Acid, Butyl Ester, Amyl Acetate Acetic Anhydride | Pentane, Hexane, Heptane, Decane, Octane, Gasoline, Hydrogen Sulfide, Cyclohexane, Gasoline, Kerosene, Diesel, Petroleum | Ether, Acetaldehyde, Trimethylamine | Ethyl Nitrite | |
| IIB | Propylene, Acetilene, Cyclopropane, Coke Oven Gas | Epoxy Z-Alkane, Epoxy Propane, Butadiene, Ethylene | Dimethyl Ether, Isoprene, Hydrogen Sulfide | Diethylether, Dibutyl Ether | ||
| IIC | Water Gas, Hydrogen | Acetilene | Carbon Disulfide | Ethyl Nitrate | ||
Maximum surface temperature: This refers to the highest temperature that electrical devices can achieve under the worst specified operating conditions, potentially igniting the surrounding explosive atmosphere. The maximum surface temperature must be lower than the flammable temperature.
For instance: In environments where explosion-proof sensors are used, if the ignition temperature of the explosive gases is 100°C, then the maximum surface temperature of any component of the sensor must remain below 100°C.