Qhov Explosion-Proof Level ABC txhais li cas

Cov “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).

Hom mob	Gas Classification	Cov pa hluav taws xob	Yam tsawg kawg nkaus Ignition Spark Zog
Sub Kuv	Kuv	Methane	0.280mJ
Factories sab nraum lub Mine	IIA	Propane	0.180mJ
	IIB	Ethylene	0.060mJ
	IIC	Hydrogen	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, acetylene, carbon disulfide, ethyl nitrate, and water gas. Those in the IIB category encompass ethylene, coke oven gas, propyne, thiab hydrogen sulfide. The IIA classification includes gases such as methane, ethane, tshuaj benzene, thiab diesel.