Rockwell Automation 1756-xxxx ControlLogix Chassis and Power Supplies Installation Instructions - Manual (Page 24)

24 Rockwell Automation Publication 1756-IN005C-EN-P - March 2014
Chapter 1 Install Chassis and Power Supplies
Install a Central Ground Bus
Each enclosure must contain a central ground bus. The ground bus is the
common connection for each chassis within the enclosure and the enclosure
itself.
For more information on installing a central ground bus, refer to the Industrial
Automation Wiring and Grounding Guidelines, publication
1770-4.1 .
Connect the Functional Earth Ground on the Chassis
Use 8.3 mm2 (8 AWG) solid or stranded-copper wire rated at 90 °C (194 °F) or
greater to connect the functional earth ground.
Connect the functional earth ground as shown in Figure 12 .
Figure 12 - Functional Earth Ground Connection
Item Description
1 Chassis mounting tab
2 Equipment grounding conductor (ground lug with 8.3 mm² [8 AWG] solid or
stranded-copper wire rated at 90 °C [194 °F] or greater)
3 M4 or M5 (#10 or #12) flat or star washer
4 M4 or M5 (#10 or #12) Phillips screw and flat or star washer (or SEM screw)
20291-M
1 3
4
2