• For power supply redundancy mode (
n
+1 redundancy mode), you need enough power supplies to power
all switch operations and one extra power supply that can replace a failing power supply. You connect
all power supplies to the same AC power source. You can install the power supplies in any open power
supply slot in the chassis.
• For input source redundancy (grid redundancy) mode or full redundancy mode, you need twice the
number of power supplies needed to power the switch operations. You connect half of the power supplies
to one power source for active power and the other half to another power source for redundant power.
You must ensure that the power supplies on the left side of the chassis are connected to one grid and that
the power supplies on the right side of the chassis are connected to the other grid.
Before you begin
Before you connect power supplies to one or two power sources, ensure all of the following:
• You have receptacles for one or two AC power sources within reach of the power supply cables. The
number of power sources depends on the power mode to be used for the switch.
• Combined power (no power redundancy)—One AC power source
• Power supply redundancy (
n
+1 redundancy)—One AC power source
• Input source redundancy (power-grid redundancy)—Two AC power sources
• Full redundancy—Two AC power sources
• The AC power sources are rated as follows:
• For North American installations—20A with 110V or 220V circuits.
• For international installations—size the circuits by local and national standards.
• The power supply is already installed in the chassis.
• The chassis is connected to an earth ground.
Step 1
Ensure that the power supply switch located on the front of the power supply is set at standby (labeled as 0).
Step 2
Plug the AC power cable into the power supply. The built-in latch secures the power cable to the power supply. You can
disconnect the power cable from the power supply by pressing the release button on the power cable.
Step 3
Plug or connect the other end of the power cable into a AC power source supplied by the data center.
If you are using the combined power mode or power supply redundancy, you connect the power cables to the
same 20-A circuit. If you are using the input source redundancy mode or full redundancy mode, you connect
half of the power cables to one AC power source and the other half to another AC power source.
Note
Take care when connecting units to the supply circuit so that wiring is not overloaded.
Warning
Statement 1018
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the
protective device is rated not greater than:
Warning
250V, 20 A
Cisco Nexus 7706 Hardware Installation Guide
OL-31330-01
108
Installing or Replacing Modules, Fan Trays, and Power Supplies
Connecting a 3.5-kW HVAC/HVDC Power Supply to AC Power Sources
