Cisco 1841 - 3G Bundle Router Hardware Installation Manual page 51

Chapter 4 Chassis Installation Procedures for Cisco 1800 Series Routers (Modular)
Figure 4-12
Connect the other end of the ground wire to a known reliable earth ground point.
Step 4
Note
OL-5876-03
Attaching the Ground Wire to the Chassis
If there is any doubt as to the reliability of the ground point, contact a licensed electrician for
assistance.
Cisco 1800 Series Routers (Modular) Hardware Installation Guide
Installing the Chassis Ground Connection
4-13