Figure 27: Installing the Power Supply
AC power supply1
Connecting to the Power Source
You follow the same steps to install the AC-input and DC-input power supplies, but you must ground them
differently.
• AC-input power supply—It is automatically grounded when you connect its power cable to the power
supply and the power source.
• DC-input power supply—You do not connect the power supply directly to the earth ground.
You use one power cord for each power supply to connect the power supply to its power source.
Before You Begin
Before you connect power supplies to power sources, ensure the following:
• The chassis is connected to an earth ground. See Establishing the System Ground, on page 45.
• You have receptacles for the power sources within reach of the power supply cables.
• If you are connecting to a DC power, check that you are using 8-24 AWG power cables to connect to
the power supply. The 8-24 AWG wire size applies to the negative [-], and positive [+] cables that connect
to negative and positive apertures on the connector. You have to procure the power cable.
• If you are installing more than one DC-input power supply, each must be protected by a dedicated circuit
breaker or a fuse that is sized according to the power supply input rating and the local or national electrical
code requirements.
• The power sources are rated as follows:
• For North American AC-input installations—10 A with 110 V circuits.
• For North American DC-input installations—(–48 VDC nominal at 37 A in North America (operating
range: –40.5 to –56 VDC).
Catalyst 6840-X Switch Series Hardware Installation Guide
56
Installing and Removing Power Supplies
Connecting to the Power Source
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