Airflow Requirements - Cisco Nexus 9300-FX Hardware Installation Manual

Airflow Requirements

supply. Typically, this switch and a power supply require about 200 W of power input from the power source,
but you must provision as much as 443 W power input from the power source to cover peak demand.
Note
Some of the power supply modules have Underwriter Labs (UL) rating capabilities that exceed the switch
requirements. When calculating power requirements, use the switch requirements to determine the amount
of power required for the power supplies.
To minimize the possibility of circuit failure, make sure that each power-source circuit used by the switch is
dedicated to the switch.
Note
For AC input application, please refer to the statement below:
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 statement below:
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 40A when the switch is powered with regular
• Ensure that the protective devices are rated not greater than 10A when the switch is powered with HVDC
Note For the power cables to use with the power supplies, see
Airflow Requirements
The switch is designed to be positioned with its ports in either the front or the rear of the rack depending on
your cabling and maintenance requirements. Depending on which side of the switch faces the cold aisle, you
must have fan and power supply modules that move the coolant air from the cold aisle to the hot aisle in one
of the following ways:
Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide
8
DC power supplies (rated 48-60VDC).
power supplies (rated 240-350VDC).
Power Cable Specifications, on page
Preparing the Site
44.