Annex 7: minimum requirements for acoustic signs
Published 12 September 2024
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This publication is available at https://www.gov.uk/government/publications/mgn-556-mf-amendment-2-safety-signs-and-signals-regulations-2001/annex-7-minimum-requirements-for-acoustic-signs
1. Intrinsic features
1.1 Acoustic signs must:
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1.1.1 have a sound level that is considerably higher than the level of ambient noise, so that it is audible without being excessive or painful
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1.1.2 be easily recognisable, particularly in terms of pulse length and the interval between the pulses or groups of pulses and be clearly distinct from any other acoustic signal and ambient noises
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1.1.3 if a device can emit an acoustic signal at variable and constant frequencies, the variable frequency should be used to indicate a higher level of danger or a more urgent need for the request/imposed intervention or action in relation to the stable frequency
2. Code
2.1 The signal for evacuation must be continuous.