Cisco N9K-C93128TX Hardware Installation Manual page 18

Planning for Power Requirements
The power supplies are rated to output up to either 1200 W ( AC power supplies) or 930 W (DC power
supplies) but the switch requires less than those amounts of power from the power supply. To operate the
switch, you must provision enough power from the power source to cover the requirements of both the switch
and a power supply. Typically, this switch and a power supply require about 582 W of power input from the
power source, but you must provision as much as 853 W power input from the power source to cover peak
demand.
Note Some of the power supply modules have rating capabilities that exceed the switch requirements. When
calculating your power requirements, use the switch requirements to determine the amount of power that is
required for the power supplies.
To minimize the possibility of circuit failure, make sure that each power-source circuit that is used by the
switch is dedicated to the switch.
Note
For AC input application, please refer to the following statement:
Warning Statement 1005 Circuit Breaker
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the
protective devices are rated not greater than 20A (North America), 16A (Europe), and 13A (UK).
Note
For DC input application, please refer to the following statement:
Warning
Statement 1005 Circuit Breaker
This product relies on the building's installation for short-circuit (overcurrent) protection.
• Ensure that the protective devices are rated not greater than 30A when the switch is powered with regular
DC power supplies (rated 48-60VDC).
• Ensure that the protective devices are rated not greater than 10A when the switch is powered with HVDC
power supplies (rated 240-350VDC).
Note
We recommend 8-AWG wire for DC installations in the U.S.
Note For the power cables to use with the power supplies, see
Cisco Nexus 93128TX ACI-Mode Switch Hardware Installation Guide
8
Power Cable Specifications, on page
Preparing the Site
54.