2
—23
EX protection mark designation:
A B C D E F G H
II 2G
Ex db
h
IIB+H2
T4
Gb
A - Electrical apparatus suited for use in explosive atmospheres mark
B - Site of use mark II
– all other sites of use except mining
C - Apparatus category mark 2G
– gas (zone 1 and 2) and 3G (zone2)
D
– Type of ex- protection mark for motor-
E-Type of protection of fan-h non electrical equipment
F
– Gases explosive class mark
II B+H2
– Gaseus group IIB + hydrogen and all of lower classes for use in sites class II
G
– Temperature class mark (max permitted temperature of apparatus surface which is in contact with explosive
gas atmosphere) -
T4
– 135
0
C
– for area temp. 40ºC max temperature of motor is 95ºC
H
– Equipment Protection Level (EPL) acc. with EN 60079-0:
EPL b
– with high level of protection and therefore a high degree of safety
II 2D Ex h tb IIIC T130…T160°C Db
A B C D E F G H
II
2D
Ex h
tb
IIIC
T135
ºC…T160ºC
Db
A - Electrical apparatus suited for use in explosive atmospheres mark
B - Site of use mark II
– all other sites of use except mining
C - Apparatus category mark
2D
–dust (zone 21 and 22)
D
– Type of protection of fan-h non electrical equpment
E
– Type of ex- protection mark for motor
F
– Dust group -
IIIC - Conductive dust (zone 21 and 22) -
specific electrical resistance < 10³
G
– Temperature class mark (max permitted temperature of apparatus surface which is in contact with
explosive gas atmosphere) - T4
– 1350C – for area temp. 40ºC max temperature of motor is 95ºC H
H
– Equipment Protection Level (EPL) acc. with EN 60079-0:
EPL b
– with high level of protection and therefore a high degree of safety
For ATEX fans to comply with this designation they will have Exd motors and the external terminal box will be
Exe or Exd
