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Classification of Apparatus by Gas Group, Temperature Class and Gas/Vapour Type
Temperature Classes
Gas Group Classification |
450° C - T1 |
300°C - T2 |
200°C - T3 |
135°C - T4 |
100°C - T5 |
85°C - T6 |
I
for use underground in mines in the presence of Methane (fire damp) |
|
Methane |
|
|
|
|
II A
For use above ground, and subdivided according to their suitability for use in atmospheres containing specific gases and vapors as identified in the subgroups. |
Ammonia
Carbon Monoxide
Chlorobenzine
Pentane |
Xylene
Acetone
Ethanol
Propane
Methanol
Ethylacetate
Benzene
Amylacetate
n-Butyl Alcohol
n-Butane |
Cyclohexane
Diesel
Aviation Fuel
n-Propul Alcohol |
Heptane
Hexane |
|
|
IIB |
Coal Gas |
Ethylene
Buta 1:3 Diene |
|
Diethyl Ether |
|
|
IIC |
Hydrogen |
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Acetylene |
|
|
Carbon Sulphide |
*Apparatus classified in a temperature class is deemed to be suitable for use in gases and vapors appropriate to that and all lower temperature classes. For instance, a lamp reaching a temperature of 130 °C would be marked T4. That temperature would not ignite the gases or vapors in the T4 row; neither would it ignite the gases or vapors in the T3, T2 or T1 rows. However, that temperature would ignite gases or vapors in the T5 or T6 rows, such as carbon disulphide.
Classification of Apparatus Protection Type
IECEx Standard |
Protection Type |
Protection Type Code |
Hazard Zone Class |
Gas |
Dust |
|
Gas |
Dust |
Gas |
Dust |
60079-0 |
61241-0 |
General Information |
60079-1 |
61241-1 |
Flameproof |
EX d |
Ex tD |
1 |
20 |
60079-2 |
61241-2 |
Pressurized |
Ex p |
Ex pD |
1 |
21 |
60079-5 |
– |
Powder filled |
Ex q |
|
1 |
– |
60079-6 |
– |
Oil filled |
Ex o |
– |
1 |
– |
60079-7 |
– |
Increased safety |
Ex e |
– |
1 |
– |
60079-11 |
61241-11 |
Intrinsic safety |
Ex ia
Ex ib |
Ex iaD
Ex ibD |
0
1 |
20
21 |
60079-15 |
– |
Non sparking
Energy limited
Restricted breathing
Enclosed break
Pressurized |
Ex nA
Ex nL
Ex nR
Ex nC
Ex nP |
– |
2 |
– |
60079-18 |
61241-18 |
Encapsulation |
Ex ma
Ex mb |
Ex maD
Ex mbD |
0
1 |
20
21 |
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