Question of the month


Question of the month


Question of the month

Our office receives some excellent safety enquiries from our clients. This month we share a good question.



How loud should safety alarms be? 



The appropriate sound level for alarms

The optimal sound level is where everyone hears the announcement above background noise but does not risk hearing damage or discomfort to passengers or staff.

The warning signals from emergency loudspeakers shall meet the following requirements:

The minimum Sound Pressure Level (SPL) shall not be less than 65 dB(A) and exceed the ambient SPL by a least 10 dB. The maximum SPL shall not exceed 105 dB(A) throughout the emergency zone.

Reference: AS 1670.4:2015 Fire detection, warning, control and intercom systems—System design, installation and commissioning Part 4: Emergency warning and intercom systems

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