Cables armoured symmetrical pair twisting for data transmission, with single-wire copper conductive cores with cross-section from 0,20 to 2,50 mm², number of twisted pairs from 1 to 12 or two parallel-stacked pairs, with insulation and sheath made of polyvinylchloride plasticate of reduced fire hazard with low smoke and gas emission, with an additional thermal barrier in the form of a winding of mica-containing tape over the core, with a screen of laminated aluminium foil, with armour in the form of a braid of galvanized steel wires, without protective hose, designed for operation at voltages up to 300 V inclusive alternating current frequency of 50 Hz.
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