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Cable of increased fire resistance flexible armoured 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 number of pairs from 1 to 4, with additional barrier in the form of winding "eight" polyimide film in twisted pair, with 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, with armour in the form of a braid of galvanized steel wires, without a protective hose, for rated voltage up to 300 V inclusive AC frequency 50 Hz, for single and group laying.