Range of application: fiber-optic transmission systems in public telecommunication networks, service networks and dedicated networks if connected to the public communication network, installation between buildings of different types, installation in communication power automatic control electric railways at points with a maximum electric field potential of up to 12 kV, inside protective PE pipes (including air blowing installation), in swamps, in cable trays, in ducts, tunnels, sewers, on bridges and overpasses, as well as winding, connecting and attaching to external load-bearing power t points with a maximum electric field potential up to 12 kV.