Directive or
standard
Code Description
Harmonised
European
standard
Ex = Marking of explosion protection
h =
Constructional safety (c) and Liquid immersion (k) according to EN ISO
80079-36 and EN ISO 80079-37
db = Flameproof enclosure according to EN 60079-1
eb = Protection according to EN 60079-7
mb = Encapsulation according to EN 60079-18
IIB = Classification of gases, see EN 60079-0. Gas group B includes gas group A.
T4/T3 =
Maximum surface temperature is 135 °C (T4) in direct-drive pumps and 200 °C
(T3) in pumps operated by frequency converter, according to EN 60079-0*
Gb = Suitable for use in explosive gas atmospheres in zone 1 and zone 2
tb = Protection by enclosure EN 60079-31
IIIC = Conductive dust
T135 °C /
T200 °C
= Maximum surface temperature
Db = Suitable for use in explosive dust atmospheres in zone 1 and zone 2
*For motors connected to a frequency converter, the
maximum surface temperature T3 is 200 °C.
Australia
Explosion-proof variants for Australia are approved as
Ex nA II T3 according to IEC 60079-15
(corresponding to AS 2380.9).
Standard Code Description
IEC 60079-15:1987
Ex = Area classification according to AS 2430.1
nA =
Non-sparking according to AS 2380.9:1991, section 3
(IEC 79-15:1987)
II = Suitable for use in explosive atmospheres (not mines)
T3 = Maximum surface temperature is 200 °C
X
The letter X in the certificate number indicates that the
equipment is subject to special conditions for safe use.
8
English (GB)
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