A consolidated list of references of harmonised standards under directive 94/9/EC for ATEX was published in the Official Journal C 233 on 3 August 2012.
These European standards provide solutions for compliance and presumption of conformity with relevant essential health and safety requirements of the ATEX directive that they cover.
However, the use of harmonised standards remains voluntary and manufacturers can choose whether or not to follow a harmonised standard to manufacture their products. Manufacturers may thus use other technical solutions providing for an equivalent level of safety. In that case, they must be able to prove that their products are in conformity with the mandatory essential health and safety requirements, taking due account of the state of the art.
More information on the ATEX directive (equipment and protective systems for potentially explosive atmosphere)