Installation Instructions User Manual

Rockwell Automation Publication 1756-IN005C-EN-P - March 2014 23
Install Chassis and Power Supplies Chapter 1
Ground the Chassis
Complete these steps to properly ground your chassis.
The following figure shows an example grounding configuration. After you
complete the grounding steps, your system looks similar to this figure.
Figure 11 - Grounding Configuration Example
Use these guidelines when connecting the grounding:
• Use a steel enclosure to guard against electromagnetic interference (EMI).
• Install a bonding wire for electrical contact between the enclosure door
and the enclosure; do not rely on the hinge.
• Make sure the enclosure-door viewing window is a laminated screen or a
conductive optical substrate (to block EMI).
Grounding Step Page
Install a Central Ground Bus 24
Connect the Functional Earth Ground on the Chassis 24
Connect the Protective Earth Ground 25
Connect the Grounding Conductors to the Ground Bus 26
Connect Ground Bus to Grounding-electrode System 26
TIP
To minimize the resistance between the chassis and ground connection, keep
wire lengths as short as possible.
Functional Earth Ground, page 24
Protective
Earth Ground,
page 25
Cabinet
To Grounding-electrode System
45805
8.3 mm² (8 AWG) solid or
stranded-copper wire
rated at 90 °C (194 °F) or
greater
2.1 mm² (14 AWG) solid or
stranded-copper wire
rated at 90 °C (194 °F) or
greater
Ground Bus