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Fire-resistant flexible cable 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 wrapping with polyimide film in a twisted pair, with a belt insulation made of polyvinylchloride plastic of reduced fire hazard with low smoke and gas emission and low toxicity of combustion products, with a screen of laminated aluminium foil with a metallic layer outside and a braid of tinned copper wires, with a sheath of polyvinyl chloride plasticate of reduced fire hazard with low smoke and gas emission and low toxicity of combustion products, for rated voltage up to 300 V inclusive alternating current frequency of 50 Hz, for single and group laying.