WAGO-I/O-SYSTEM 750
Use in Hazardous Environments 161
750-489 4AI RTD/TC/Strain Gauge Ex i
Manual
Version 1.1.0, valid from FW Version 02
Figure 45: Text Detail – Marking Example for Approved Ex i I/O Module According to NEC 505
Table 160: 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 46: Text Detail – Marking Example for Approved Ex i I/O Module According to NEC 506
Table 161: 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)