In accordance with the Regulation relating to Explosive Atmospheres (Verordnung über explosionsfähige Atmosphären, VEXAT), areas in which an explosion hazard exists must be subdivided into zones in accordance with the extent, frequency and duration of persisting explosive atmospheres. For flammable gases, vapours and mists, the zones 0, 1 and 2 have been defined, for flammable dusts the zones 20, 21 and 22, and for rooms used for medical purposes, the zones G and M. Depending on the zone, no ignition sources may be present during regular operations or when disturbances are foreseeable or occur rarely. Work equipment with inherent potential ignition sources must be safe and suitable for the respective zone as set forth in the manufacturer’s instructions (i.e. pursuant to the Regulation relating to Explosion Protection (Explosionsschutz-verordnung, ExSV).
