1.1 This standard specifies the design, construction, testing and marking requirements for Group I, Category M1 equipment indended to remain functional in underground parts of mines, as well as those parts of surface installations of such mines endangered by firedamp and/or coal dust clouds under normal atmospheric conditions pressures ranging from 0.8 bar to 1.1 bar and temperatures ranging from -20 °C to +60 °C. 1.2 It applies to all electrical and non-electrical equipment capable of causing an explosion through its own potential source of ignition. 1.3 It also applies to cables, pipes and optical fibres, when such items are used to carry energy sources a
DS/EN 50303:2001 history
2001DS/EN 50303:2001 Group I, Category M1 equipment intended to remain functional in atmospheres endangered by firedamp and/or coal dust