Evacuation Tones in Aged Care Facilities

AS 1670.4-2004Almost every day we receive a telephone call or email from the public asking what appears to be a simple question about fire protection.

Over the weekend, I received the following email from 'Alan' asking about the operation of an emergency warning system;

Has there been any recent changes to the alert sequence; alert,evac then voice over. we have been told that the system must go direct to voice over {evacuate evacuate} this would cause serious problems in the aged care industry.

Before I answer the question, it is important that we go over a couple of background issues;

How to measure EWIS or PS speaker zone impedance

Impedance is a measure of the opposition to the flow of an alternating current in a circuit; the aggregation of its resistance, inductive and capacitive reactance. Represented by the symbol Z.

Maintenance Procedures for Emergency Warning & Intercommunication Systems

The maintenance of Emergency Warning & Intercommunication Systems is generally carried out according to the following standards;

Australia adopts new warning signals

Around the world, there is a move toward a International Standard for Acoustics-Audible Emergency Evacuation Signal, also known as a "Temporal-Three, T-3 or Temporal Tone". The temporal tone is being adopted around the world as the standard evacuation tone pattern and allows for better recognition by all Australians and people from other countries.