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Cable of increased fire resistance armoured for data transmission systems with twisted pair of insulated silicon-organic rubber copper single-wire conductive cores with diameter from 0,50 to 1,75 mm with number of pairs from 1 to 4, with additional barrier in the form of wrapping "eight" polyimide film in the twisted pair, with an additional thermal barrier over the core in the form of a winding of mica-containing tape, with a screen of laminated aluminum foil, with a sheath of polymer composition, halogen-free, with armor in the form of a braid of galvanized steel wires, without protective hose, for rated voltage up to 300 V inclusive alternating current frequency of 50 Hz, for single and group laying.