Ex Certification, Which one?

The approvals that require the most work but gives a manufacturer the most global coverage are

UL or FM: United States National Electric Code Also accepted in some countries in the Middle East

CSA: Canadian Electric Code

ATEX: International Electric Code within the European Union

IECEx: International Electric Code outside of the European Union. Accepted by Multiple Countries outside of the European Union such as Australia and some countries in the Middle East.

The answer is, IECEx. Besides AUSEx and ANZEx, IECEx is now regarded the most common acceptable type of certification for Ex rated electrical equipment for use in Australia.