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DIRECTIVE 2014/34/EU (ATEX)
Danger zones
Zone
0
1
2
Equipment categories
Category
1
2
3
Gas groups
Group
I
IIA
IIB
IIC
Temperature class
The equipment must be chosen such that its surface temperature never reaches the self-ignition
temperature of the gas present. Below are some examples of explosive gases classified according
to their self-ignition temperature. This list is non-exhaustive.
Gas
group
IIA
IIB
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Definition
Zone in which an explosive atmosphere of gas or gas vapours is permanently present
for long periods or regularly.
Zone in which an explosive atmosphere of gas or gas vapours is likely to form
occasionally under normal operation.
Zone in which an explosive atmosphere of gas or gas vapours is not likely to form
under normal operation or, if this occurs nonetheless, only forms for a short period.
Definition
Equipment with a "very high" degree of safety
Equipment with a "high" degree of safety
Equipment with a "normal" degree of safety
Reference
gas
Methane
Equipment intended for mines, on the surface or under the surface
Propane
Ethylene
Equipment intended for surface industries other than mines
Hydrogen
Temperature class and maximum surface temperature of the equipment
T1
T2
450 °C
300 °C
Methane
Butane
Propane
Ethanol
Toluene
Methanol
Xylene
Propanol
IIC
Ethylene
Town gas
oxide
Hydrogen
Acetylene
Definition
T3
T4
200 °C
135 °C
Kerosene
Nonane
Acetaldehyde
Octane
Pentane
Ethyl ether
Usage zone(s)
0
1 and 2
2
T5
T6
100 °C
85 °C
Carbon
bisulphide
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