Which Level Of Explosion-Proof ABC Is Higher

The highest level is C.

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

Explosion-proof classifications are categorized into three levels: IIA, IIB, and IIC. The IIC level ranks above IIB and IIA and typically carries a higher price tag.

Many customers are uncertain about which explosion-proof rating to select. Essentially, explosion-proof ratings correlate with the specific flammable and explosive gas mixtures encountered in the environment. For instance, hydrogen corresponds to an IIC rating. Carbon monoxide corresponds to an IIA rating; therefore, the applicable explosion-proof control box should also be IIA, though IIB is frequently used in its place.