Answer: ATEX is the European legal framework (Directive 2014/34/EU) that makes Ex equipment conformity mandatory in the EU. IECEx is the international certification system built on the IEC 60079 series. ATEX is required in the EU; IECEx is accepted in many non-EU markets. Both assess equipment against largely aligned standards, so a well-engineered fitting can often carry both.
Definitions
ATEX ('Atmosphères Explosibles') is a directive with legal force in the EU/EEA. IECEx is a voluntary global conformity assessment system administered by the IEC.
Scope
ATEX covers equipment and protective systems placed on the EU market. IECEx provides international certificates and is recognised across many countries outside Europe.
Marking
ATEX markings include the shield/Ex symbol, zone, group and temperature class. IECEx markings follow the same underlying parameters, making them readable across both systems.
Which you need
If you sell or operate in the EU, ATEX is mandatory. For global projects, IECEx eases market access. Many manufacturers certify to both — as covered on the IWAY explosion-proof page.