•ATEX: Mandatory in the EU, plus Norway, Iceland and Liechtenstein, since 2003. Voluntarily accepted in the national standards of several non-EU countries, although IECEx is gaining ground as more countries seek to become part of a globally recognized system.
•IECEx: Accepted in many countries globally either directly by national rules or as a relevant standard where no such rules apply. A full list of member bodies and officers can be found on the iecex.com website.