Fibre-optic cable for laying in soils of all groups when laying in a trench, groups 1-3 when laying with a knife cable-laying machine. In cable ducts, in special pipes, in blocks, in collectors, in trays, in tunnels, on bridges, overpasses and with increased requirements for resistance to mechanical effects, with increased requirements for protection against water penetration, including laying through navigable and nonnavigable rivers, through bays, straits and laying through swamps. As well as in areas with active manifestations of permafrost deformations.
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