Shenhai Explosion-Proof
Explosion-proof equipment within Class II is categorized into: Class IIA, Class IIB, and Class IIC. The ratings follow a hierarchy: IIC > IIB > IIA.
| Condition Category | Gas Classification | Representative gases | Minimum Ignition Spark Energy |
|---|---|---|---|
| Under The Mine | I | Methane | 0.280mJ |
| Factories Outside The Mine | IIA | Propane | 0.180mJ |
| IIB | Ethylene | 0.060mJ | |
| IIC | Hydrogen | 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.