Introduction to ATEX
192-550003N10 ETH ATEX December 2019 9
1.5.3. Zone classification / device categories
The table below describes the zones of an installation, where potentially explosive
atmospheres may occur. The proprietor must analyze and assess the area, where
explosive gas/dust mixes may occur and, if necessary, subdivide them into
individual zones. This zone classification permits to select suitable machinery and
equipment which can be used in this area.
Suitable machinery and devices
Presence of potentially
explosive atmospheres
Area of application
(not mining)
Permanently, often, for a
long period
approx. > 1000 h / year
occasionally
approx. 10 ... 1000 h /
year
rarely, for a short period,
in the event of an error
approx. < 10 h / year
* Equipment for use in areas (except underground in mining) which might be
dangerous due to an explosive atmosphere.
Example:
Zon e 1
Cat egorie 2
Zone 2
Categorie
3
Zon e 0
Cat egorie 1
1.5.4. Type of explosion protection
In addition to category and device class, which are the minimum required
information, the device or component designation gives additional information with
reference to the type of protection and explosion group for gases and mists.
The type of explosion protection defines which method or measures is/are used for
explosion protection in given equipment or individual components.
For non electric equipment, the following types of explosion protection are
possible:
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