scope:

This International Standard applies to an audible emergency evacuation signal. The signal shall be used for, and limited to, situations requiring immediate evacuation from a building because of an emergency. When sounded, the signal shall indicate imminent danger and signify unambiguously that evacuation from the building is immediately necessary. The signal may also be applied to outside areas when required by the authority having jurisdiction. This International Standard specifies two parameters of the audible emergency evacuation signal, i.e. the temporal pattern and the required sound pressure level at all places within the intended signal reception area. In order for the audible emergency evacuation signal to be recognizable, it is not necessary to specify the spectral content of the signal. The spectral content of the signal should be selected to satisfy specific site requirements and/or national regulations. This International Standard applies to the audible signal and not to the individual signalling system components. This International Standard does not apply to warning signals, to situations covered by national regulations for public disaster control, alarm systems on board ships or to signals from all outdoor moving vehicles, such as police cars, fire engines and ambulances.