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Gas Groups
Temperature Classes
Types of Protection
What to Use Where
Atex Directive
Atex Grouping
Atex Approval
Notified Bodies
Atex Marking
Atex Label





Equipment is Grouped and Categorized by Location
under ATEX

The Atex Directive simplifies knowing what equipment can be used in different zones by grouping and categorizing them according to the following table (e.g. in a Zone 0 vessel, equipment must be Group 11, Category 1). This removes the necessity for users to memorise if particular types of protection are appropriate to particular zones.

For Equipment Used in: Designation

Product Location & Protection Requirements



Group I


Products that remain functional in explosive atmospheres and have protection measures such that if:
one measure fails, another provides sufficient safety
two independent faults occur, sufficient safety is provided
Products intended to be de-energised in event of explosive atmospheres. Products must provide safety in event that explosive atmospheres could occur before being de-energised and under severe operating conditions. M2
All Other Explosive Atmospheres Group II


Where explosive atmospheres (gases vapours, mist or dust) are highly likely to occur and present continuously for long periods or frequently (similar to Zone 0 in IEC 79-10 and Zone 20 for dust), protection must:
* In the event of 1 measure failing, have at least a second independent measure to provide sufficient safety.
* In the event of 2 independent faults, ensure sufficient safety
Where explosive atmospheres (gases vapours, mist or dust) are likely to occur (similar to Zone 1 in IEC 79-10 and Zone 21 for dust), protection measures must provide safety even with operating faults or in dangerous operating conditions 2
Where explosive atmospheres (gases, vapours, mist or dust) are less likely to occur and if they do, are infrequent and for a short time (similar to Zone 2 in IEC 79-10), protection measures must be at a level for the intended use and equipment operate within its operational parameters. 3