Page 97 - DMcatalogue2017

Low voltage AC motors

Explosive atmospheres

To ensure equipment can be safely used in potentially ignition the equipment of the gas mixtures concerned, and in
explosive atmospheres, the explosive atmospheres where specific cases the gas group must be known (e.g.flame
the equipment is installed must be known. The temperature proof protection).
class of equipment must be compared with the spontaneous

Gas classification Gas subdivision

Temperature Ignition Max. permitted Gas examples IIA - 120 gases and vapours, e.g. butane/petroleum/propane
class temp. of gas/ temp. of IIB - 30 gases and vapours, e.g. ethylene/dimethyl ether/coke oven gas
vapour °C equipment °C IIC three gases: hydrogen H2 /acetylene C2H2 carbon disulfide CS2
T1 >450 450 Hydrogen
T2 >300 <450 300 Ethanol
T3 >200 <300 200 Hydrogen sulfide
T4 >135 <200 135 Diethyl ether 6
T5 >100 <135 100 -
T6 >85 <100 85 Carbon disulfide

Marking of equipment protection for gas according to ATEX

CE Conformity marking Equipment protection marking for gas:

0081 II 2 G Ex d IIB T4 Gb
CE marking
Identifi cation Protection type Ex d = fl ameproof
of the notifi ed body Equipment grouping IIB for gas group B
responsible for the Temperature class T4 = max. permitted 135°C
approval. 0081 is the Equipment protection level = level b for gas
identifi cation number
of LCIE
The European Commission
mark for Ex products
Equipment grouping: II for surface industry
Equipment category: 2G for gas
environment demanding a high
level of protection

Marking of equipment protection for gas according to IEC

Example for gas:
Ex d IIB T4 Gb

Protection type Ex d = fl ameproof
Equipment grouping IIB for gas group B
Temperature class T4 = max. permitted 135°C
Equipment protection level = level b for gas

Drives and controls, motors and mechanical power transmission catalogue 97