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2.6.3
EX zone classification
Areas that are prone to explosion are classified into zones. The owner must determine the zone that exists.
Information on the zone classification can be found in IEC 60079-10 and in national standards. The following
table contains an overview of the zone classification in combination with the device category.
Gases
device category
Vapours
Mist
Zone 0
Zone 1
Zone 2
5.52.127.01.01.02
Ignition tem-
Temperature
perature of gas
class
T1
>450
T2
>300 <450
T3
>200 <300
T4
>135 <200
T5
>100 <135
T6
>85
Dust
(Gases)
1G
Zone 20
2G
Zone 21
3G
Zone 22
max. surface
temperature of the
operating material in
°C
°C
450
300
200
135
100
<100
85
device category
(dust)
1D
2D
3D
explosive
atmosphere
is present
continuously, long-term or
frequently
occasionally
rarely or short-term
9
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