Connecting To The Power Source; Before You Begin - Cisco Catalyst 6840 Series Hardware Installation Manual

Connecting to the Power Source

Figure 27: Installing the Power Supply
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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
• 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
• 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
• If you are installing more than one DC-input power supply, each must be protected by a dedicated circuit
• The power sources are rated as follows:
Catalyst 6840-X Switch Series Hardware Installation Guide
56
AC power supply
supply and the power source.
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.
breaker or a fuse that is sized according to the power supply input rating and the local or national electrical
code requirements.
• 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).
Installing and Removing Power Supplies
Establishing the System Ground, on page 45.