Telephone cables with polyethylene insulation, sheath

1 Conducting cores - single-wire from copper soft wire. 2 Insulation - of polyethylene, in the form of a continuous concentric layer. 3 Pairs - twisted from insulated conductors 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.