Cables used for signalling and as power cables in buildings requiring people, cultural and material protection: ensure operation of warning systems, fire extinguishing systems, emergency lighting, ventilation, smoke dampers, and other systems, which is necessary for efficient rescue operation. Construction of cores: cores of class 1 or 2, round. Operating temperature: up to +110°C, minimum ambient temperature for cables placed permanently: −30°C, minimum ambient temperature when placing a cable: -5°C, maximum temperature of a core during short circuit: +250°C.