The power supply to a typical security system should be loaded no greater than what...

A security system’s power supply must be sized with headroom to accommodate additional devices, future expansion, and potential peak loads. ASIS PSP guidance recommends that the system load should not exceed 60% of the total power capacity.

Loading above this threshold can reduce system reliability, limit the ability to add new devices, and stress power components, potentially shortening equipment lifespan.

Maintaining a margin ensures that batteries and power supplies can support the system under normal and emergency conditions, including temporary peak loads.

This practice aligns with standard design principles for redundancy, scalability, and safe operation of integrated security systems.