Rockwell Automation 1336T Wiring and Grounding Guide, (PWM) AC Drives - Manual (Page 62)

62 Rockwell Automation Publication DRIVES-IN001M-EN-P - March 2014
Chapter 4 Best Practices
Figure 25 - Connections to Ground Bus
Figure 26 - Ground Connections to Enclosure Wall
Do not lay one ground lug directly on top of the other. This type of connection
can become loose due to compression of the metal lugs. Sandwich the first lug
between a star washer and a nut with another star washer following. After
tightening the nut, sandwich the second lug between the first nut and a second
nut with a captive star washer.
Bolt
Star Washer
Component Grounding
Conductor
Ground Lug
Tapped Hole
Ground Bus
Component Grounding
Conductors
Star Washer
Bolt
Area Without Paint
Welded Stud
Ground Lug
Ground Lug
Star Washer
Star Washer
Component Ground
Conductor
Nut
Nut
Component Ground
Conductor