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Electromagnetic Starter devices category Aug 05, 2016

Class I underground coal mine electrical equipment

II use except mine electrical equipment

1.3 class II electrical equipment, as it applies to a mixture of explosive gas maximum experimental safe gaps and minimum igniting currents, grouped into II a, II b and II c and by its maximum surface temperature is divided into six T1-T6 group.

1.4 group according to the ignition temperature of explosive gas mixtures, see table 1.

1.5 explosive gas mixtures according to their maximum experimental safe gaps (MESG) or minimum igniting current ratio (MICR) rating