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).

Ástandsflokkur	Gasflokkun	Fulltrúar lofttegundir	Lágmarks íkveikjuneistaorka
Undir námunni	ég	Metan	0.280mJ
Verksmiðjur fyrir utan námuna	IIA	Própan	0.180mJ
	IIB	Etýlen	0.060mJ
	IIC	Vetni	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, asetýleni, kolefnisdísúlfíð, ethyl nitrate, and water gas. Those in the IIB category encompass ethylene, coke oven gas, propyne, og vetni sulfide. The IIA classification includes gases such as methane, ethane, bensen, og diesel.