What Does Explosion-Proof Level ABC Mean

O “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).

Categoría de condición	Clasificación de gases	Gases representativos	Enerxía de chispa de ignición mínima
Baixo A Mina	eu	Metano	0.280mJ
Fábricas Fóra Da Mina	IIA	Propano	0.180mJ
	IIB	Etileno	0.060mJ
	IIC	Hidróxeno	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, acetileno, carbon disulfide, ethyl nitrate, and water gas. Those in the IIB category encompass ethylene, coke oven gas, propyne, e hidróxeno sulfuro. The IIA classification includes gases such as methane, ethane, benceno, e diesel.