As the use of coal underground mining face of electrical equipment and control equipment, must be flameproof or intrinsically safe type equipment.
但是由于在煤矿井下采掘工作面使用的电气设备和控制设备，必须是隔爆型或本质安全型设备。
Such as electrical equipment for class II flameproof, gas group temperature classes for group B, for T3, then mark is: ExdIIBT3 explosion.
如电气设备为II类隔爆型，气体组别为B组，温度组别为T3，则防爆标志为：exdiibt3。
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