The European Atex Directives

Directive 1999/92/EC (ATEX 137) states that an employer must:  Prevent the formulation of explosive atmospheres in the workplace, or, avoid the ignition of explosive atmospheres, and control the effects of explosions Conduct a risk assessment to identify potential sources of releaseClassify potentially explosive atmospheres into zones Mark hazardous areas with EX signs at every point of entry Maintain an explosion protection document to include risk assessment, area classification, EX training of staff and details of your permit to work system Select ATEX compliant equipment according to intended zone

ATEX 137 also states "All necessary measures must be taken to ensure that the workplace and work equipment have been designed, constructed, assembled, installed, maintained and operated, in such a way as to minimise the risks of an explosion”