To limit the probability that persons located in certain selected zones will not be properly instructed in a fire situation, which could lead to inappropriate actions being taken by such persons, which could lead to delays in evacuation or moving to a safe place, which could lead to harm to persons.
To limit the probability that the alert and alarm signals will not continue to function in zones not receiving voice messages during a fire emergency, which could lead to delays in evacuation or moving to a safe place, which could lead to harm to persons.