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2.6
Explosion protection
The EX classification of the unit is indicated on a
separate plate, situated on the unit.
Example of ATEX classification:
CE-marking
explosion-proof operating material
II
device group / application
2
device category
G
EX atmosphere
Ex h
type of protection
IIB
explosion group II (gases)
Temperature class - gases
T4
(for dust only the temperature in °C
is stated)
Gb
EPL (equipment protection level)
2.6.1
EX-Category
5.52.653.01.01.05
II
2
G Ex h
I
II
1
2
3
G
D
IIA
IIB
IIC
T1
T2
T3
T4
T5
T6
Ga
Gb
Gc
EX - Zone
Device category
Expl.-group of gases
Expl.-group of dust
Temperature class - gases
Temperature class - dust
Illustration 1
IIB
European Union
danger of mine damp
other areas prone to explosion
for use in zone 0
for use in zone 1
for use in zone 2
...caused by gas, steam, fog
...caused by dust
for mechanical devices, including e. g.
"c" construction safety
"k" encapsulation of liquids
limit gap widths (MESG) > 0,9 mm
limit gap widths (MESG) ≤ 0,9 to ≥ 0,5 mm
limit gap widths (MESG) < 0,5 mm
limit temperature 450 °C
limit temperature 300 °C
limit temperature 200 °C
limit temperature 135 °C
limit temperature 100 °C
limit temperature 85 °C
e.g. Group II (for gases, vapours, mist):
level of protection: very high (complies with zone 0)
level of protection: high
(complies with zone 1)
level of protection: enhanced (complies with zone 2)
1+21
1+21
2+22
2+22
2
2
IIB
IIB
IIIA
IIIA
T4
T3
T135°C
T200°C
T4
Gb
7
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