Allen-Bradley SLC 500 Manual Del Usuario página 9

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. If you have not already installed a central ground bus, see the
Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1.
Connect Equipment Grounding Conductor
Important: Use the following information, along with the installation manual
for your programmable controller, to ground the chassis and your I/O modules.
20291
chassis mounting tab
ground lug with 5.2 mm
4M or 5M (#10 or #12) star washer
2
(10 AWG) wire
Installation Instructions
SLC 500 Modular Chassis
1746-A4, -A7, -A10, -A13 Series B
Note: Keep wire length
as short as possible.
4M or 5M (#10 or #12) phillips screw
and star washer (or SEM screw)
7