Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 63)

Publication 1747-UM011G-EN-P - June 2008
System Installation Recommendations 63
publication 1770-4.1, and System Design for Control of Electrical Noise,
publication GMC-RM001.
United States: An authoritative source on grounding requirements for most
installations is the National Electrical Code. Also, refer to Allen-Bradley
Programmable Controller Grounding and Wiring Guidelines, publication
1770-4.1 and System Design for Control of Electrical Noise, publication
GMC-RM001.
In addition to the grounding required for the SLC 500 controller and its
enclosure, you must also provide proper grounding for all controlled devices in
your application. Care must be taken to provide each device with an acceptable
grounding path.
This figure shows you how to run ground connections from the chassis to the
ground bus. The recommended grounding method is shown below. Using a
ground bus reduces the electrical resistance at the connection.
Ground Connection Paths
(1)
(1)
(1)
Earth Ground
8.37 mm
2 (8 AWG) wire
Functional Ground
5.26 mm
2 (10 AWG)
(1) Keep safety ground connection to panel as short as possible.
Nearest Ground Bus
Safety Ground
2 mm
2 (14 AWG)
Safety Ground
2 mm
2 (14 AWG)
Safety Ground
2 mm
2 (14 AWG)