Safety, Protection & Standards
Zone 20 / 21 / 22
Dust-atmosphere hazardous-area zones describing how often an explosive dust cloud is expected.
IN ONE SENTENCE
Zone 20 is continuous/frequent, Zone 21 likely in normal operation, and Zone 22 unlikely and short-lived.
In normal English
Dust ignition also depends on surface temperatures, dust layers and enclosure protection.
Why would I use it?
Use it for classified combustible-dust locations.
THINK OF IT LIKE…
The dust equivalent of Zones 0, 1 and 2.
Related terms
hazardous area, ATEX, combustible dust
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