WAGO-I/O-SYSTEM 750
Use in Hazardous Environments
45
753-466 2 AI 4-20 mA S.E.
Manual
Version 1.5.0
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Figure 30: Text Detail – Marking Example for Approved Ex i I/O Module According to NEC 505
Table 19: Description of Marking Example for Approved Ex i I/O Module According to NEC 505
Marking
Description
CI I,
Explosion protection group
Zn 2
Area of application
AEx
Explosion protection mark
nA
Type of protection
[ia Ga]
Type of protection and equipment protection
level (EPL): Associated apparatus with intrinsic
safety circuits for use in Zone 20
IIC
Group
T4
Temperature class
Gc
Equipment protection level (EPL)
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Figure 31: Text Detail – Marking Example for Approved Ex i I/O Module According to NEC 506
Table 20: Description of Marking Example for Approved Ex i I/O Modules According to NEC 506
Marking
Description
CI I,
Explosion protection group
Zn 2
Area of application
AEx
Explosion protection mark
nA
Type of protection
[ia IIIC]
Type of protection and equipment protection
level (EPL): Associated apparatus with intrinsic
safety circuits for use in Zone 20
IIC
Group
T4
Temperature class
Gc
Equipment protection level (EPL)
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