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Cisco MGX 8950 Hardware Installation Guide
Release 3, Part Number 78-14147-02 Rev. A0, November 2002
Chapter 3 Installing a Cisco MGX 8950
Installation Procedures
Ground the Frame Bonding Ground Connection for a Cisco-Supplied Rack
A Cisco-supplied rack has two pairs of grounding studs located at the top and bottom of the rack. The
rack comes with the hardware needed to secure a ground conductor to the grounding studs. The
grounding studs measure 1/4 inch by 20 threads per
inch. The grounding studs can accept a two-holed
grounding connector designed to prevent rotation and possible loosening of the connector.
Note If you are installing your switch in a third-party vendor rack or cabinet, ensure that the rack and cabinet
are properly grounded.
Caution The switch ground wire must be the same size as the return conductor so that it can carry the entire
battery load. See the
“Wiring a Mixed Ground System with Redundant Supplies” section on page C-9
for more information.
Caution When moving a Cisco-supplied cabinet, do not push the cabinet at its sides. Instead, grip its front or
back edges.
The ground conductor is typically connected to the building earth wiring, usually at a power distribution
board. Complete the following steps to attach a ground conductor to the frame of a Cisco rack:
Step 1 Place the external, toothed star washers onto a stud. Figure 3-3 shows a Cisco cabinet with the frame
bonding connection studs in the upper and lower parts of the cabinet. Only one of the studs is needed to
make the connection. A ground symbol on the Cisco rack indicates the points of attachment.