BS 8519:2020 pdf free download – Selection and installation of fire-resistant power and control cable systems for life safety, fire-fighting and other critical applications一 Code of practice.
3 Terms and definitions
For the purposes of this British Standard, the following terms and definitions apply.
3.1 average power output
ratio of the average load demand to the rated generator power
3.2 building fabric enclosure
elements of a building that in combination offer a specified level of fire resistance and water ingress protection to protect the life safety; fire-fighting and other critical equipment
NOTE These elements can comprise walls, floors, doors, etc.
3.3 cable protective system
factory-manufactured insulated enclosure providing thermal, mechanical and water protection to the life safety; fire-fighting and other critical system cables installed within the enclosure to maintain their circuit integrity with a fire condition external to the enclosure
3.4 electrical equipment enclosure
control panel or switchgear enclosure accommodating control, indication and protective devices serving the life safety; fire-fighting and other critical system equipment
3.5 fire-resistant cable
cable able to maintain circuit integrity for a stated fire survival time and under conditions as defined in a standard test
3.6 other critical systems
systems, other than life safety and fire-fighting, that by virtue of their importance to business resilience, property protection or protection of the environment or safety; are specified as required to remain operable during a fire for a predefined period
3.7 selectivity (discrimination)
ability of a protective device to operate in preference to another protective device in series
3.8 substation
switch room of an electricity transmission and distribution system where voltage is transformed from high to low voltage or the reverse using transformers
4 General
The electrical system should be designed, installed and verified by a skilled person suitably competent to comply with BS 7671 and to install switchgear and controlgear conforming to
BSEN 60947.
The type of electrical distribution system selected during the design phase should be derived from a detailed process of consultation with the relevant authorities having jurisdiction over the project in question, taking account of the overall fire strategy. The design should be agreed at the earliest stage.
NOTE Specifically with reference to other critical systems, the appropriate levels offire survival time are agreed in consultation between all interested parties.
5 Fire survival times
The minimum fire survival time of the power and control (cable) circuits should be categorized as follows:
a) circuit category 1: 30 mm fire survival time;
b) circuit category 2: 60 mm fire survival time; or
c) circuit category 3: 120 mm fire survival time.
The recommended cable categories shown in Table 1 should be used for specific life safety and fire-fighting applications.
NOTE The fire survival time of power and control (cable) circuits to life safety,fire-fighting and other critical systems within buildings is dependent on the fire survival time of the building fabric and the cable/busbar installation. In fire engineered buildings designed to BS 7974. the fire survival time of the building fabric might vary according to the fire strategy, as part of a fire engineered solution.