What Does Explosion-Proof Level ABC Mean

Déi “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).

Konditioun Kategorie	Gas Klassifikatioun	Representativ Gasen	Minimum Ignition Spark Energy
Ënnert der Mine	ech	Methan	0.280mJ
Fabriken ausserhalb der Mine	IIA	Propan	0.180mJ
	IIB	Ethylen	0.060mJ
	IIC	Waasserstoff	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, acetylen, Kuelestoffdisulfid, ethyl nitrate, and water gas. Those in the IIB category encompass ethylene, coke oven gas, propyne, an Waasserstoff sulfide. The IIA classification includes gases such as methane, ethan, benzen, an diesel.