# Council Directive 92/58/EEC of 24 June 1992 on the minimum requirements for the provision of safety and/or health signs at work (ninth individual Directive within the meaning of Article 16 (1) of Directive 89/391/EEC), Division 1.1: Acoustic signals must:

Extent: E+W+S+N.I.

(a) have a sound level which is considerably higher than the level of ambient noise, so that it is audible without being excessive or painful;
(b) be easily recognizable, particularly in terms of pulse length and the interval between pulses or groups of pulses, and be clearly distinct from any other acoustic signal and ambient noises.

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Source: https://www.legislation.gov.uk/eudr/1992/58/annex/VII/division/1/division/1.1 (the official version)
Page: https://openlegislation.uk/eu-directive-1992-58/annex-VII/division-1/division-1.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.