What Does Explosion-Proof Level ABC Mean

Det “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).

Tilstandskategori	Gasklassificering	Repræsentative gasser	Minimum tændingsgnistenergi
Under Minen	jeg	Metan	0.280mJ
Fabrikker uden for minen	IIA	Propan	0.180mJ
	IIB	Ethylen	0.060mJ
	IIC	Brint	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, kulstofdisulfid, ethyl nitrate, and water gas. Those in the IIB category encompass ethylene, coke oven gas, propyne, og brint sulfide. The IIA classification includes gases such as methane, ethan, benzen, og diesel.