Building, in which the loss of voltage in the electric supply network may pose a threat to human life or health, it should be powered from at least two independent ones, self-switching on sources of electricity and equipped with self-switching emergency lighting (security and evacuation), where in relation to the high-rise building it is required, that one of the aforementioned power sources is a generating set.
Security lighting should be used indoors, in which even a short-term switch-off of the basic lighting may endanger human life or health, and its operating time should be adapted to the conditions in the room, but not shorter than 1 time. Evacuation lighting should be used on all escape routes in high and high-rise public utility buildings and collective housing., and its operating time should be at least 2 hours after the primary lighting goes out.
In electrical installations in buildings, fire breakers should be used, cutting off the power supply to all circuits, except the circuits supplying installations and devices, the operation of which is essential in a fire. Fire circuit breakers should be used separately for each fire zone with a volume exceeding 1000 m3. Because the evacuation scenario for high-rise buildings and high-rise buildings usually involves the evacuation of users from the fire zone in the first stage, maintaining the conditions for the normal functioning of the facility in other zones, in this type of facilities, separate fire current switches for each fire zone should be used, regardless of its cubature. Fire protection switches should be placed near the main entrance to the facility and appropriately marked, and cutting off the power supply with them should not cause automatic switching on of the second source of electric energy, including generator set, except for the source of emergency lighting.
Wires and cables with their fittings, used in the power supply and control systems for fire protection devices should ensure the continuity of electricity supply under fire conditions for the required operation time of the fire protection device, but not less than 90 min. This time may be limited to 30 min, when the above-mentioned pipes and cables are within spaces protected by a fixed sprinkler device, or they are used to supply and control smoke dampers. The above-specified requirements do not include detailed solutions for power supply and control of fire cut-off dampers and fire ventilation dampers..