Telephone cables with insulation, sheath and

1 Conducting cores - single-wire from copper soft wire. 2 Insulation - of halogen-free polymer composition in the form of a continuous concentric layer; 3 Pairs - twisted from insulated cores of different colours. Pairs are twisted in five or ten-pair elementary bundles.

4 Core - twisted from elementary bundles of different colours. 5 Belt insulation - made of polyamide, polyethylene, polyethylene terephthalate or polypropylene tapes. 6 Shield: aluminopolyethylene tape laid lengthwise.

A tinned copper wire is laid longitudinally under the screen. 7 Sheath: halogen-free polymer composition. 8 Protective cover - made of two galvanised steel strips applied with a gap.

9 Protective hose: halogen-free polymer composition.