• You must connect both the system ground connection and the power supply ground connection to an
earth ground. The system ground connection is required if FXS modules are installed or if this equipment
is installed in a U.S. or European Central Office.
• When using DC-input power supplies, you must install the system ground before you attach the source
DC power cables to the DC PEM. Power down the chassis before attaching the system ground.
In all situations, grounding practices must comply with Section 250 of the National Electric Code (NEC)
requirements or local laws and regulations. A 6 AWG grounding wire is recommended from the chassis to
the rack ground or directly to the common bonding network (CBN). The equipment rack should also be
connected to the CBN with 6 AWG grounding wire.
Note
The system ground serves as the primary safety ground for chassis that are equipped with DC-input power
supplies. The DC-input power supplies for these chassis do not have a separate ground.
Note
Required Tools and Equipment
To connect the system ground, you need the following tools and materials:
• Grounding lug — When using the double-hole lug connector provided with the system, the ground wire
must be 6 AWG only. Otherwise, a supported closed-loop ring connector must be used for 8-14 AWG
wire.
• Grounding screws — Two M4.0 x 8mm Phillips pan-head screws. Supplied as part of the accessory kit.
• Grounding wire — Not supplied as part of accessory kit. The grounding wire should be sized according
to local and national installation requirements. For U.S. installations, AC power supply systems require
a 14 AWG copper conductor. Commercially available 8-14 AWG wire is recommended. DC power
supply systems with 930W power supply module require a 12 AWG wire and 1600W power supply
module require an 8 AWG wire. The length of the grounding wire depends on the proximity of the switch
to proper grounding facilities.
• No. 1 Phillips screwdriver.
• Crimping tool to crimp the grounding wire to the grounding lug.
• Wire-stripping tool to remove the insulation from the grounding wire.
Connecting the System Ground
To establish an earth ground for the chassis, you must attach a grounding cable from the chassis’ grounding
lug to the rack.
Cisco Catalyst 9500 Series Switches Hardware Installation Guide
40
Installing a Switch
Required Tools and Equipment
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