When design a fire alarm to a category PD, the following should be considered.
A fire can start virtually anywhere in a dwelling, although the probability of fire varies significantly from
one room to another. The probability of a fire occurring is usually ascertained by carrying out an on site fire risk assessment, as required by the FSO.
If a fire alarm system is not fitted and the fire is not detected at an early stage, it can grow until it becomes difficult or impossible to extinguish. The highest level of property protection will therefore be given by a Category PD1 system (giving full coverage of all parts of the dwelling). In a large house of high value, or with contents of high value, such a fire system is generally the only Category acceptable to fire insurers. The fire alarm system will normally have a facility for automatic transmission of fire alarm signals to an alarm receiving
centre.
A lower level of fire protection, still giving a useful reduction in fire risk, can sometimes be obtained by the fire alarm installation of fire detectors only in those parts of the building in which there is significant potential for ignition. A Category PD2 system provides partial cover of this nature.
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