Alarm warning devices

The purpose of a fire alarm warning device is to warn person(s) within, or in the vicinity of, a building of the occurrence of a fire emergency situation in order to enable such person(s) to take appropriate measures. Fire alarm warning devices could be sounders, visual alarm e.g. beacons, or even loudspeakers. These devices can be of different construction and may have different parameters for example sounders are defined in terms of frequency ranges, temporal patterns and output levels, beacons are defined in terms of light temporal pattern and frequency of flashing.


Guidance on the type, frequency, temporal pattern, and output levels should be sought from the applicable installation rule or code of practice - for example BS 5839-1 recommends sounders with continuous output and frequency range between 500 Hz to 1000 Hz.

Fire alarm devices may be used for other type of risk or non-fire emergency alarm. In this case it is always recommended that a different message, colour, temporal pattern, or frequency signal from the fire signal is selected to avoid confusion.

LPCB offers certification of Alarm warning devices to:-

  • EN 54-3: 2001 Sounders
  • EN 54-3: 2001 + A1: 2002 + A2: 2006 Sounders
  • EN 54-23: 2010 Visual alarms
  • EN 54-24: 2008 Loudspeakers
  • EN 54-25: 2008 Components using radio links

The initial approval and continued approval processes for audible, visual and loudspeaker warning devices are outlined in scheme documents SD115, SD113, and SD039.

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