When designing fire alarm systems for residential properties, the following should be considered.
In the case of fire detection grades, Grade D, Grade E and Grade F systems, where more than one smoke alarm is installed the
smoke alarms normally need to be interlinked. Any heat alarms also need to be interlinked with the smoke alarms.
Guidance documents supporting legislation, and written requirements produced by enforcing authorities, often specify only a minimum level of fire system engineering, rather than a particular form of system. These Grades are defined in such a way that a requirement for one Grade of fire alarm system can be satisfied (normally at
higher cost) by the installation of a higher Grade of system; for example, if the fire risk justified the installation of a Grade D system, it would be acceptable to install a fire alarm system of an Grade A, Grade B or Grade C category.
Because of the wide range of fire systems covered by the recommendations of this part of BS 5839, the specification of requirements for a system by a purchaser, user, enforcing authority or insurer, or the description of a system by a designer or installer, by reference to this standard, without a reference to system
Grade, will have little meaning.
Annex B provides further information on each Grade of system, including the advantages and disadvantages of each Grade.
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