What Does Explosion-Proof Level ABC Mean

De “abc” represents gas classifications, categorized into three levels—IIA, IIB, and IIC—according to the maximum experimental safe gap (MESG) or the minimum igniting current (MIC).

Betingst Category	Gas Klassifikaasje	Representative gassen	Minimum Ignition Spark Energy
Under The Mine	ik	Metaan	0.280mJ
Fabriken bûten de myn	IIA	Propaan	0.180mJ
	IIB	Ethyleen	0.060mJ
	IIC	Hydrogen	0.019mJ

Of these, the IIC classification is deemed the most hazardous, with IIB and IIA following in decreasing order of risk. Gases falling under the IIC classification include hydrogen, acetylene, koalstofdisulfide, ethyl nitrate, and water gas. Those in the IIB category encompass ethylene, coke oven gas, propyne, en wetterstof sulfide. The IIA classification includes gases such as methane, ethane, benzene, en diesel.