ATEX and IECEx Explained.
ATEX and IECEx are both certification systems for equipment used in explosive atmospheres, but they have different origins, scopes, and regulatory frameworks.
1. Origin & Regulatory Basis
ATEX (Atmosphères Explosibles)
Originates from the European Union (EU).Based on EU directives (notably 2014/34/EU for equipment and 1999/92/EC for workplace safety)
Legally required for products used in explosive atmospheres in the EU and some other regions.
IECEx (International Electrotechnical Commission Explosive Atmospheres)
A global certification system developed by the International Electrotechnical Commission (IEC).
Not legally mandatory, but widely accepted internationally as a benchmark for safety.
More common in Australia, Canada, the Middle East, and some parts of Asia and South America.
2. Certification Approach
ATEX
Relies on self-declaration for lower-risk products (Category 3).
Requires involvement of a Notified Body for higher-risk products (Categories 1 and 2).
Focuses on both electrical and non-electrical equipment.
IECEx
Requires third-party certification for all products (testing, quality audits, and factory inspections).
Provides a more rigorous and standardised certification process.
Primarily focused on electrical equipment, but non-electrical certification is expanding.
3. Documentation & Marking
ATEX Marking Example:
Ex II 2G Ex db IIC T4 Gb
"II" → Non-mining equipment
"2G" → Zone classification
"Ex db" → Explosion protection method
"IIC" → Gas group
"T4" → Temperature class
IECEx Marking Example:
Ex db IIC T4 Gb
Uses similar marking principles but without the EU-specific "II 2G" part.
4. Global Acceptance
ATEX is primarily valid within the EU and EEA.
IECEx is internationally recognised and often required in non-EU markets.
Some countries (e.g., Australia, New Zealand, and the Middle East) prefer IECEx over ATEX.
Some companies may seek dual certification (both ATEX & IECEx) for broader market access.
Key Takeaways
ATEX = EU compliance, legally required, allows some self certification.
IECEx = Global system, stricter third-party certification, internationally recognised.
If operating only in Europe, ATEX is sufficient. If working globally, IECEx certification is preferred.
Examples of ATEX and IECEx solenoid valves according to protection method.