Telephone cables with insulation, sheath and protective hose made of halogen-free polymer composite materials, armoured TPPPe

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.