Explosion prevention is divided into I and II level, I would like to ask, is not the coal mine industry must use I explosion-proof lamp, or according to actual occasions can use II class?
Class I and class II are classified according to different explosive atmospheres.Class I: electrical equipment for coal mines;Class II: electrical equipment for other explosive gas atmospheres other than coal mines.For the coal mine, it is OK to meet the type I standard.
Simple point is:1 class I: mine explosion-proofClass I electrical equipment for use in coal mine environments2 II classFactory explosion-proof
The newly revised national standard, GB3836.1, divides explosive atmospheres into electrical equipment, class I, class II, and class III:1 class IClass I electrical equipment used in coal mine gas and gas environment.Note: the type I explosion-proof model takes into account the ignition of methane and pulverized coal as well as the physical protection added to underground equipment.Electrical equipment for coal mines, which may contain other explosive gases in addition to methane, shall be manufactured and tested in accordance with the requirements of class I and class II combustible gases. Such electrical equipment should have corresponding signs (e.g., "Ex, D, T3, I/IIB" or "ExdI/II" (NH3)".2 II classClass II electrical equipment for use in other explosive gas atmospheres other than coal mine methane gas.Class II electrical equipment may be further reclassified according to the type of explosive environment to be used.Reclassification of class II electrical equipment:Class II: the representative gas is propane;Class IIB: the representative gas is ethylene;Class IIC: the representative gas is hydrogen.3 III classClass III electrical equipment for use in explosive dust atmospheres other than coal mines.Class III electrical equipment can be further reclassified according to the characteristics of the explosive dust environment to be used.Reclassification of class III electrical equipment:- IIIA: combustible flyings;Class IIIB: non conductive dust;Class IIIC: conductive dust.
