Atex Brochure - Norgren - #4

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04 I ATEX
What equipment can be used? - Ex-Zones and Categories
Table 1 shows the zone designations, which are divided firstly into the hazardous areas for gases, vapours and mists and secondly into the hazardous areas for dusts, as well as by their risk categories, i.e. according to the probability of a risk of being present. The categories, which define the degree of equipment safety are assigned.
It can be seen from the table to which category a piece of equipment must be allocated in order to be used in a particular zone. Of course, equipment in a higher category also fulfils the requirements of a lower category.
Table 1
Hazard
Risk
Zone
Category
Equipment
Gases, vapours and mists
continuous or long-term or frequent
0
II 1 G
very high level of safety
(safe in spite of 2 independent faults)
Gases, vapours and mists
occasional
1
II 2 G
high level of safety
(safe even for normally expected fault)
Gases, vapours and mists
occasional, then only briefly
2
II 3 G
normal level of safety
(safe under normal operation)
Dusts
continuous or long-term or frequent
20
II 1 D
very high level of safety
(safe in spite of 2 independent faults)
Dusts
occasional
21
II 2 D
high level of safety
(safe even for normally expected fault)
Dusts
occasional, then only briefly
22
conducting dusts non-conducting dusts
II 2 D II 3 D
high level of safety normal level of safety

pageCatalog pdf di En 2012-02-06-12