Neither loss nor restoration of primary power shall cause what?

The correct answer relates to the requirement that the alarm system's functionality must remain intact during power fluctuations, including the loss or restoration of primary power. Specifically, alarm signals must not be triggered simply due to changes in power status, ensuring that the system operates reliably and only activates alarms under genuine emergency conditions.

This is crucial in maintaining the integrity of the fire alarm system. If alarm signals could generate on power loss or restoration, it may lead to false alarms during routine conditions, which can cause unnecessary panic and undermine the trust that occupants have in the system.

The other options—system diagnostic mode, power cycling of the system, and reboot of the control panel—are related to system functionality but do not represent the critical requirement that alarm signals should not be triggered inaccurately due to power conditions. Hence, the focus is rightly placed on the reliability of alarm signals during transitions in power supply.