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WAGO-I/O-SYSTEM 750
Use in Hazardous Environments
39
750-555 4AO 4-20mA
Manual
Version 1.2.1
Figure 18: 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)
Figure 19: 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)