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Zones for dusts

Hazardous areas are classified into zones based upon the frequency of the occurrence and the duration of an explosive dust/air mixtures, the following definitions are only applicable to equipment group II.

NOTE 1 - Layers, deposits and heaps of combustible dust may be considered and any other source which can form an explosive atmosphere.

NOTE 2 - Normal operation means the situation when installations are used within their design parameters.


  • EN 13237:2003 (E)

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