Ⅰ electrical equipments used in coal mine

Type Ⅱ except mine using electrical equipment

1.3 Aaccording to its maximum surface temperature into T1 - T6 six groups to Ⅱ A, Ⅱ B, Ⅱ C three categories

1.4 with explosive gas mixture by grouping, ignition temperature are shown in table 1.

1.5 with explosive gas mixture, according to its maximum experimental safe gap (MESG) or minimum ignition current ratio (MICR) classification, as shown in table 2.