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.