To limit the probability that disconnected or damaged audible signal devices on one floor will interfere with the ability of devices on other floors to operate, which could lead to persons not being promptly notified of a fire situation, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
To limit the probability that disconnected or damaged audible signal devices within specified areas will interfere with the operation of devices outside these areas (or vice-versa), which could lead to persons not being promptly notified of a fire situation, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.