Install a 450 W or 550 W Internal AC Power Supply
Some switches are shipped without installed power supplies. They accommodate one or two Summit 450 W or 550 W AC power supply units.
Summit 550 W AC power supplies are available for switches with either front-to-back or back-to-front airflow.
An AC power cord is not included with the AC power supply. You can purchase AC power cords for use in the US and Canada from Extreme Networks or from your local supplier. The cord must meet the requirements listed in Power Cord Requirements for AC-Powered Switches and AC Power Supplies.
Before installing the power supply:
- Verify that the switch rack or chassis has been grounded.
- Verify that the airflow direction for the power supply is the same as the airflow direction of the installed fan modules in the switch.
When installing an AC power supply, be sure to observe the following precautions:

Warning
To prevent an electrical hazard, make sure that the AC power cord is not connected to the power supply before you install the power supply in the power supply bay.
Caution
Make sure the AC power supply circuit is not overloaded. Use proper overcurrent protection, such as a circuit breaker, to prevent overcurrent conditions.To install a Summit 450 W or 550 W power supply (AC power), follow these steps: