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They are used as a subscriber line cable in local distribution networks for short and medium distances.
The cavities of the cable core are filled continuously with viscous compound to avoid water penetration.
1- Conductors :
Each conductor consists of a solid wire of annealed, grade A copper, having a diameter of 0.6 mm or 0.8 mm.
2- Insulation :
Each conductor is insulated with a layer of solid polyethylene. The thickness shall be according to DIN VDE 0816 table 4
3- Stranding :
Four appropriately coloured insulated conductors are assembled together to form a quad.
- Unit stranding
- Five star quads stranded to sub units; each 5 or 10 sub units stranded to main units and the sub or main units stranded to cable core.
The cables are fully filled with a high grade, high drop point, petroleum based, jelly compound..
A wrapping tape is applied over the cable core It consists of:
- An outer layer of absorbing paper materiel.
- An inner layer of insulating polyester tape.
6- Moisture barrier
Over the wrapping tape, is applied an aluminum tape (0.2 mm of thickness) coated on both sides with polymer.
The sheath is black low density polyethylene (2YM2) containing 2,5 0.5% carbon black.