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Explosion-proof equipment within Class II is categorized into: Class IIA, Class IIB, and Class IIC. The ratings follow a hierarchy: IIC > IIB > IIA.
| Tingimus Kategooria | Gaasi klassifikatsioon | Representatiivsed gaasid | Minimaalne süttimise energia |
|---|---|---|---|
| Under The Mine | I | Metaan | 0,280mJ |
| Tehased väljaspool kaevandust | IIA | Propaan | 0,180mJ |
| IIB | Etüleen | 0,060mJ | |
| IIC | Vesinik | 0,019mJ |
Gas detectors rated for IIC explosion-proof conditions are suitable for all flammable gases; however, IIB detectors fail to detect H2 (hydrogen), C2H2 (acetylene), and CS2 (carbon disulfide), which are characteristic of the IIC class.