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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.
Gas
Vapour
Mist
Zone
device category
0
1
2
8
Ignition tem-
Temperature
perature of gas
class
T1
>450
T2
>300 <450
T3
>200 <300
T4
>135 <200
T5
>100 <135
T6
>85
Zone
1G
20
2G
21
3G
22
max. surface
temperature of the
operating material in
°C
°C
450
300
200
135
100
<100
85
Dust
device category
continuously, long-term or
1D
2D
3D
explosive
atmosphere
does exist
frequently
occasionally
rarely or short-term
5.52.624.01.01.00
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