ATEX zones
Areas where an explosive dust atmosphere can occur are classified as zone 20, 21 or 22; for gas, zone 0, 1 or 2. The employer classifies the zones, and the machine’s marking must cover the zone it works in.
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Dust group IIIC.
Combustible dust is divided into IIIA (combustible flyings), IIIB (non-conductive dust) and IIIC (conductive dust, such as metal powders). Equipment marked IIIC can be used for all three groups; equipment marked IIIB is not for conductive dust.
3dust groups: IIIA, IIIB, IIIC
In this entry
3 short parts.
Part1The groupsIIIC is the strictest.↓ Part2Conductive dustIt can short-circuit equipment.↓ Part3Related entriesMore on the same topic.↓1The groups
Three groups of combustible dust.
Equipment marked IIIC can be used for all three groups. Equipment marked IIIB is not for conductive dust.
The dust group is part of the ATEX marking, for example II 3D Ex h IIIC.
2Conductive dust
Why conductive dust needs more.
Conductive dust can short-circuit electrical equipment and defeat ESD protection.
Metal powders such as aluminium, magnesium and copper are typical examples.
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The wiki gives general explanations. Always check the marking and the manual of your machine.
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