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Extra resources for BS 5839 - 2002 Fire Detection
NOTE 9 It will often be necessary to measure the sound pressure level of the fire alarm signal in the presence of background noise. The sound pressure level of the fire alarm signal (in isolation) can be deemed to be 5 dB above background noise if, when the background noise is present, a sound pressure level increase of 6 dB occurs on operation of the fire alarm system. b) The frequency(ies) produced by fire alarm sounders should lie in the range of 500 Hz to 1 000 Hz, unless the frequency of background noise is such as to mask these frequencies, in which case the use of sounder frequencies outside this range is acceptable.
E. 1f)] in Category L and P systems should silence automatically after 30 min, unless the premises are continuously occupied so enabling manual silencing by occupants. After silencing, the sounders may (or may not) restart if, before the system is reset, a further alarm condition occurs; 2) where a radio-linked Category L or P system incorporates battery powered fire alarm sounders, subject to agreement of the authority responsible for enforcing fire safety legislation, the sounders should silence automatically after 30 min, unless the premises are continuously occupied so enabling manual silencing by occupants.
NOTE 1 Cases have been reported in which the frequency of the alarm sounders has been such as to corrupt tone dialling systems, leading to failure of the emergency call. d) The designer should determine from the purchaser or user whether automatic means of transmission of alarm signals to an alarm receiving centre is required by the user. g. on the basis of a fire risk assessment), facilities should be provided for automatic transmission of alarm signals to an alarm receiving centre, unless there are reliable arrangements for summoning the fire service by persons in the building.