Industrial Automation Wiring and Grounding Guidelines E115P
7
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 a captive star washer. After
tightening the nut, sandwich the second lug between the
first nut and a second nut with a captive star washer.
Figure 6 – Typical Grounding Configuration
Enclosure Wall
I/O Chassis Wall
Nut
Ground
Lug
14 AWG
14 AWG
See Figure 3
See Figure 4
I/O Modules
DIN Rail
Star
Washers
Star
Washer
Ground
Lug
Ground
Bus
Mini-processor with
built-in power supply
Power-Supply
Module
Grounding-
Electrode
Conductor
To Grounding-
Electrode
System
Equipment-Grounding
Conductors 8AWG
Equipment-Grounding
Conductors 14AWG
Ground
Bus
PLC with
Power Supply
Chassis with
Power Supply
Chassis
with 2 Power
Supplies
Power Supply
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