VIDEOTECH EXH Manuel D'instructions page 37

The following table shows the classification of a some gases and steams on the basis of the groups of
explosion-proof protection and to the temperatures.
I Methane
IIA
Ethyl acetate
Acetic acid
IIB
IIC
Note:
The class of superior temperature automatically covers the lower ones (T6 is better than T1).
The IIB class also covers the IIA.
The IIC class also covers the IIB and IIA.
Temperature class
Maximum superficial temperature (°)
of the housing (*) admitted by the
relative class
(*) Normally reported to an temperature environment = 50°C. The lowest temperature of ignition of the relative
explosive atmospheres must be higher than the maximum superficial temperature of the housings.
T1 T2
Acetone n-butane
Ethane n-butyl
Ammonia
Benzene
(pure)
Carbon
monoxide
Methanol
Propane
Toluene
Ethylene
Acetylene
Hydrogen
T1
450
T3
Benzine Acetaldehyde
Diesel fuel Ethyl ether
Aircraft fuel
Heating Oil
n-hexane
T2 T3 T4 T5
300 200 135 100
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T4 T5
Carbon
disulphide
T6
85
MNVCEXH_0702
T6
Ethyl nitrate