Symmetrical high-frequency communication cables with film-porous-film polyethylene insulation, in aluminium sheath, with protective cover Bp, for nominal AC voltage of remote supply up to 690 V with frequency of 50 Hz or DC voltage up to 1000 V, are designed for laying in soils that are not aggressive towards steel armour, except for those subject to permafrost deformations, in areas characterised by increased electromagnetic influence, and in water when crossing shallow swamps, non-navigable and non-swimmable rivers with calm water flow.
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