1. Overview of Explosion Protection
1-8
TI 33Q01J30-01E
1.4
Symbols That Indicate Specifications of
Explosion Protection
Each country has its own symbols. The following is an example of symbols.
Europe (ATEX, IECEx, UKEX)
F010403.ai
EXA 15 ATEX 0017 X
(1)
(2)
(3)
(4)
(1) EXA:
Notified body
(2)
Year of issuance
(3)
ATEX 0017:
EC-type examination certificate with sequence number 0017
(4) X
Specific conditions of use
F010404.ai
II 3(1) G Ex nA [ia Ga] IIC T4 Gc
(1) (2) (3) (4) (5)
(6)
(7) (8) (9)
(1)
Indicates that it is an explosion protection equipment
(2)
Equipment group:
I: Underground mines and associated surface installations
II: All other surface installations
(3)
Equipment category:
1:
All other surface installations,
Level of protection: Very high, Presence of duration of explosive atmosphere: Continuous presence for Zone 0 and 20
2:
All other surface installations,
Level of protection: High, Presence of duration of explosive atmosphere: Likely to occur for Zone 1 and 21
3:
All other surface installations,
Level of protection: Enhanced, Presence of duration of explosive atmosphere: Unlikely to occur for Zone 2 and 22
( ):
Associated apparatus
(4)
G flammable gas / vapour or D combustible dust substances:
G:
Firedamp
D:
Coal dust
(5) Ex:
Indicates that it is an explosion protection equipment.
(6)
Type of protection:
d:
Flameproof enclosures “d”
px/py/pz:
Pressurized enclosures “p”
q:
Powder filling “q”
o:
Oil immersion “o”
e:
Increased safety “e”
ia/ib/ic:
Intrinsic safety “i”
pv:
Equipment protection by pressurized room “p”
nA/nC/nR: Type of protection “n”
ma/mb/mc: Encapsulation “m”
[ ]:
Associated apparatus
(7)
Equipment category:
II A:
Propane
II B:
Ethylene
II C:
Acetylene/ Hydrogen
Dec. 3, 2021-00
