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Glossary

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Zone 21

Area not classified as zone 20 in which combustible dust, as a cloud, is likely to occur during normal operation, in sufficient quantities to be capable of producing an explosive concentration of combustible dust mixed with air. This zone can include, among others, areas in the immediate vicinity of powder filling or emptying points and areas where dust layers occur and are likely, in normal operation, to give rise to an explosive concentration of combustible dust mixed with air [IEC 61241-3, definition 2.12].

Referenced:

  • BS IEC 61241
 

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