You need the following tools and equipment to install an external power supply:
# 1 Phillips screwdriver
Rack mount screws suitable for your organization‘s equipment rack
Screwdriver suitable for use with your rack-mount screws
AC power cord
An AC power cord is not included with the external power supply. Obtain a power supply cord that meets the requirements listed under Power Cord Requirements for AC-Powered Switches and AC Power Supplies.
When you connect an external power supply, consider all of the equipment that is connected to the power supply circuit to ensure that the circuit is not overloaded. Use proper overcurrent protection, such as a circuit breaker, to prevent overcurrent conditions.
The switch and each redundant power supply source should be plugged into separate branch circuits to provide redundancy.