Installation Instructions User Manual

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 mm (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