Fire Alarm system design

Fire alarm design has to consider the category of the purposed system. The design principles are the same whether you are installing a wireless fire alarm or a wired one. In some circumstances, even a Category L3 fire system might not be sufficient to achieve the life safety objective.
A fire risk assessment might determine that, in addition to the protection afforded by a Category L3 system,
fire detectors need to be installed in rooms or areas that would not be protected in a Category L3 fire alarm system. The
resulting system would then be a Category L2 system. A Category L2 system would be appropriate if a risk assessment determines that the fire risk associated with rooms other than those opening onto escape routes is unacceptable. Alternatively, there might be a need to give enhanced early warning to occupants of certain
rooms, such as disabled people, of a fire in their own room. In this case, wired smoke detection or wireless fire alarm detectors
within the rooms in question are necessary; heat detectors will not respond quickly enough.

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