Cisco NCS 4000 Series Hardware Installation page 191

Installing Power Components
Note
Figure 90: Attaching to Side NEBS Bonding and Grounding Point
Step 3 Use the torque wrench to tighten the bolts to a torque of 35 in-lb (3.95 N-m).
Step 4
Connect the other end of the ground cable to a grounding point at your site, according to site requirements.
The two grounding point screws are required for proper bonding and grounding of the chassis and
should not be removed.
Installing the Chassis Ground Cable
Hardware Installation Guide for Cisco NCS 4000 Series
171