Fire detection and fire alarm systems are usually installed in dwellings to protect life. However, the level of protection afforded to occupants needs to be related to the fire risk. The level of risk is usually established by carrying out a fire risk assessment.
The appropriate level can therefore vary considerably. For the purposes of BS5839-6, fire alarm systems are classified as follows, according to the level of protection that they afford.
Category LD: a fire detection and fire alarm system intended for the protection of life.
The designation “LD” is used to distinguish these systems, which are intended only for dwellings, from Category L fire systems
as defined in BS 5839-1, which are intended for the protection of life in any type of building.
Category LD systems are subdivided into:
Category PD: a fire detection and fire alarm system intended for the protection of property.
The designation “PD ” is used to distinguish these systems, which are intended only for dwellings, from Category P systems
as defined in BS 5839-1, which are intended for the protection of property in any type of building.
Category PD systems are subdivided into:
A fire alarm system is rarely installed solely for the protection of property. Accordingly, Category PD systems will normally be designed to comply with the recommendations of this part of BS 5839 for a Category LD system,
thereby constituting a combined Category LD and Category PD system.
Because of the wide range of 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 Category, will have little meaning.
No comments:
Post a Comment