Explosion-Proof Level DII BT4 and DII CT4

The IIC classification exceeds the IIB classification and serves as a reference for designing electrical equipment in explosive environments.

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

All devices fall under the T4 temperature classification, where the maximum allowable surface temperature is capped at 135°C.