Add the operating current of each device that will run from the 24V DC power supply, including access control, security, CCTV, and other connected equipment. Choose a supply rated above the combined continuous load, and account for startup or peak current, battery charging, and future devices when applicable.

A regulated 24V DC power supply uses internal control circuitry to keep its output close to 24 volts as the load or input conditions change, which supports equipment with steady voltage requirements. An unregulated supply can produce a higher voltage with little or no load and may drop as the load increases, so confirm that connected equipment can handle the variation before selecting one.

Choose a 24V DC power supply with battery backup or charging capability when connected access control, security, CCTV, or other low-voltage equipment needs continued power during an AC outage. These units charge compatible standby batteries during normal operation and switch to battery power when AC fails, helping maintain system operation and support monitored power conditions.

For 24V DC power supplies, provide the specified AC input, select the 24V DC output setting where applicable, and size the wiring and supply for the connected load’s voltage and current requirements. Follow the unit’s terminal labeling and installation instructions, use the appropriate enclosure or mounting arrangement, and connect batteries, fire alarm inputs, monitoring circuits, and grounded or power-limited outputs only when supported by the specific supply.