WAGO I/O System 750
Use in Hazardous Environments 43
750-537 8DO 24V DC 0.5A, diagnostics
Manual
Version 1.2.0
Figure 18: Text Detail – Marking Example for Approved I/O Module Ex i According to NEC 505
Table 21: Description of Marking Example for Approved I/O Module Ex i 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 I/O Module Ex i According to NEC 506
Table 22: Description of Marking Example for Approved I/O Module Ex i 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)