To plan for the power requirements of a switch, you must determine each of the following:
Power requirements for all the switch components
Minimum number of power supplies required to power the components that are installed in the switch.
Power mode to use and the number of extra power supplies required for that mode.
Ensure that the circuit that is used for the switch is dedicated to the switch to minimize the possibility of circuit failure.
Also, ensure that the switch uses either AC or DC power sources, not a mix of AC and DC power sources.
Calculate the power that is required for operations (available power) and redundancy (reserve power), then you can plan for
the required number of input power receptacles. The power receptacles will be within reach of the switch location.