The evacuation alarms are particularly suited to underground, hazardous, confined space and other operations that may be conducted over wide areas where no auxiliary power exists and the need to evacuate personnel is a real possibility. The main application to date has been in hard-rock tunnelling applications involving a network of tunnels containing boring machines and other heavy equipment.

The safety integrity of the system may be adjusted by the frequency of maintenance testing and even the inclusion of a redundant offline power supply under the control of a upstream controller like a PLC (except for I.S. applications).