User manual

Publication 1747-UM011F-EN-P - May 2007
System Installation Recommendations 65
Wiring Guidelines, 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)