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Cable of increased fire resistance flexible for data transmission systems with twisted pair of insulated silicon-organic rubber copper multi-wire conductive cores with diameter from 0,78 to 2,01 mm with the number of pairs from 1 to 4, with an additional barrier in the form of winding "eight" polyimide film in the twisted pair, with an additional thermal barrier over the core in the form of winding of mica-containing tape, with a belt insulation of polymer composition containing no halogens, with a screen of laminated aluminium foil with a metallic layer outwards and a braid of tinned copper wires, with a sheath of polymer composition containing no halogens, for rated voltage up to 300 V inclusive of alternating current frequency of 50 Hz, for single and group laying.