What Does Explosion-Proof Level ABC Mean

The “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).

Kategoria stanu	Klasyfikacja gazów	Reprezentatywne gazy	Minimalna energia iskry zapłonowej
Pod Kopalnią	I	Metan	0.280mJ
Fabryki poza kopalnią	IIA	Propan	0.180mJ
	IIB	Etylen	0.060mJ
	IIC	Wodór	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, dwusiarczek węgla, ethyl nitrate, and water gas. Those in the IIB category encompass ethylene, coke oven gas, propyne, I wodór sulfide. The IIA classification includes gases such as methane, etan, benzen, I diesel.