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ATEX Device Class
Group I
In mining at exposure to coal mine gas/dust
Group II
All other Ex-Areas
Combustible materials as mixture with air Duration of presence of hazardous explosive atmosphere
Continuously, for long periods or frequently (>1.000 h/Year)* Occasionally (10 – 1.000 h/year)* Never or momentary (<10h/Year)*
Gas, vapors, mists Zone 0 Zone 1 Zone 2
Dusts Zone 20 Zone 21 Zone 22
* The periods indicated are approximate, not standardized and only serves as rough clues


More rules of thumb to understand "all the time, for long periods or frequently", "occasionally" and "short term":

  • Continuously, for long periods or frequently: time mainly based on the effective operating time (> 50%)
  • Short time: a few times a year for about 30 minutes
  • Occasional: what is not covered by the criteria about "long periods" or "frequently"
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MIAG Fahrzeugbau GmbH
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Germany
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