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5
DIRECTIVE 2014/34/EU (ATEX)
Hazardous area
Gas
Dust
Area
0
20
Continuous, long-term or frequent presence of explosive atmosphere.
1
21
Explosive atmosphere is likely to occur under regular operation.
2
22
Explosive atmosphere is not likely to occur under regular operation or, if
it does occur, it will only be for short-period.
Equipment category
Category
Definition
Suitable for use in Zone
1
Eq
uipment with a “very high” degree of
safety
0 and 20
2
Equipment with a “high” degree of safety
1 and 21
3
Equipment with a “normal” degree of safety
2 and 22
Equipment group
Hazard
Group
Example
Equipment
Gas
I
Methane
Intended for use in mines
IIA
Propane
Intended for use in other locations than
mines
IIB
Ethylene
IIC
Hydrogen
Dust
IIIA
Combustible flyings
IIIB
Non-conductive dust
IIIC
Conductive dust
Temperature class
The equipment must be chosen so that its surface temperature does not exceed the ignition tem-
perature of the explosive gas present. Below are some examples of flammable gases classification
according to their ignition temperature (this list is not exhaustive).
Gas group
Temperature class and maximum surface temperature of the equipment
T1
450 °C
T2
300 °C
T3
200 °C
T4
135 °C
T5
100 °C
T6
85 °C
IIA
IIB
IIC
Methane
Toluene
Xylene
Butane
Ethanol
Methanol
Propanol
Propane
Kerosene
Nonane
Octane
Pentane
Acetaldehyde
City gas
Ethylene oxide
Ethyl ether
Hydrogen
Acetylene
Carbon
disulphide
