Cisco NCS 4000 Series Hardware Installation page 190

Installing the Chassis Ground Cable
The DC return of this system should remain isolated from the system frame and chassis (DC-I: Isolated
Note
DC Return).
Figure 89: Straight Barrel Grounding Lug
Steps
To attach the ground cable to the chassis, perform the following steps:
Procedure
Step 1 Use the crimping tool mandated by the lug manufacturer to crimp the lug to the ground cable.
Step 2 Use the socket wrench to attach the lug and ground cable to the grounding point.
Hardware Installation Guide for Cisco NCS 4000 Series
170
Installing Power Components