IEC 708-4
PRESENTATION
Aerial self supporting cables for local distribution telecommunication network.
REFERENCE STANDARDS
International Electro-technical Commission, Publication 708- 4 and 708 - 1
STRUCTURE
1- Conductors :
Conductors consist of solid copper having a diameter of 0.4, 0.6 or 0.8 mm
2- Insulation of conductors :
Conductors are insulated by a colored solid polyethylene layer.
The insulation thickness is such as the electrical requirements are met.
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3- Stranding :
- Element of cabling :
Cables having a capacity Equal to or lower than 5 pairs are assembled in pairs.
- Cabling element :
· Five Quads are assembled to make up a sub-bindle. Quads are identified by the insulated conductor color.
· Cables having a capacity lower than or equal to 100 pairs are assembles in concentric layers of sub-bundles of 5 Quads (10 pairs).
· Cables having a capacity equal to or higher than 100 pairs are made up of bundles of 50 pairs.
· Sub-bundles and bundles are identified with colored ropes.
4- Core wrapping
A dielectric polyester tape is applied over the cable core
5- Screen
On the cable core cover is applied an aluminum tape.
6- Drain wire
It consists of tinned copper with 0.5 mm diameter.
7- External sheath
The sheath consists of low density polyethylene. It is black and contains 2.5 0.5 % of carbon black in compliance with the European standards requirements EN 50290-2-24.
8- Suspension wire
Steel wires assembled galvanized.