S31C19 requires the installation of an emergency warning and intercom system in any building containing an atrium. The system must comply with:

• AS 1670.4; and
• the additional requirements set out in S31C19(b).

The system is a combination of an emergency warning system and an emergency intercom. The main function of an integrated system is:

• to generate an alert and evacuation signal;
• to facilitate communication with evacuation zones; and
• to provide communication between the building management or emergency services personnel and strategic points within the building.

The operation of the system may be by a number of measures referred to in Specification 31, including the manual call point (break-glass) alarm required by S31C18(1).