When must the sounding device adjacent to self-locking doors be operational?

The operational requirement for the sounding device adjacent to self-locking doors is crucial for ensuring the safety and security of residents in assisted living facilities. This device serves as an important safety feature, allowing for immediate notification of staff in the event of an emergency or when residents are in need of assistance.

When this device is operational 24 hours a day, it guarantees that no matter the time—day or night—assistance can be summoned promptly. This continuous readiness is vital, particularly in a setting where residents may require help at any time, regardless of whether it is during regular hours or off-hours.

The other options do not adequately address the constant need for safety. Relying on such devices to be operational only during specific situations, such as bad weather, check-ins, or out-of-hours visits, could create unsafe conditions for residents. Emergencies can occur at any time, so maintaining a 24/7 operational status for these devices is essential for effective emergency management and resident well-being.