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Use in Hazardous Environments
Classification Meeting CENELEC and IEC
7.3.3 Unit Categories
Moreover, the areas of use (zones) and the conditions of use (explosion
groups) are subdivided into categories for the electrical operating means:
Tab. 7-2: Unit categories
Unit
category
M1
M2
1G
2G
3G
1D
2D
3D
Explosion
Area of use
group
I
Fire-damp protection
I
Fire-damp protection
II
Zone 0 Explosive environment by gas, fumes or mist
II
Zone 1 Explosive environment by gas, fumes or mist
II
Zone 2 Explosive environment by gas, fumes or mist
II
Zone 20 Explosive environment by dust
II
Zone 21 Explosive environment by dust
II
Zone 22 Explosive environment by dust
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