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Norma UNI ISO 7240-19

Fire detection and alarm systems - Part 19: Design, installation, commissioning and service of sound systems for emergency purposes
(Sistemi fissi di rivelazione e di segnalazione allarme d'incendio - Parte 19: Progettazione, installazione, messa in servizio, manutenzione ed esercizio dei sistemi di allarme vocale per scopi d'emergenza)

Documentation
Emergency management plan: it shall consider the following:
use of phased evacuation (For buildings and structures over 25 m effective height, the alert signal duration and any automatic sequencing of the warning signal should consider horizontal and vertical exiting, occupant characteristics, the building design approach, affected compartments and adjacent compartments as a sequence and management in use principles.)