Cables of series 278 are used for indoor telephone installations.
UTE C 93-526 and UTE C 93-527 and FRANCE TELECOM specifications
Conductors consist of a solid copper with a nominal diameter of0.4; 0.5 or 0.6 mm.
Conductors are insulated by a colored solid polyethylene layer.
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. Units:- Pairs elements for cables 1 and 2 pairs.
- Quad elements for all other cables.
· Units stranding:
- Cables with 4 pairs, 8 pairs, 14 pairs, 28 pairs: concentric
Stranding of quads.
- Cables with 56 pairs: Stranding of units of 7 quads.
- Cables higher than 56 pairs: Stranding of units of 14 quads.
A dielectric polyester tape is applied over the cable core.
Over the wrapped core cable is applied a plastic coated aluminum foil.
It consists of tinned copper wire with a nominal diameter of 0,5 mm.
The outer sheath consists of flame retarding and unleaded PVC
Maximum Conductor resistance Ø 0,4mm -> 144 ?/km
Maximum Conductor resistance Ø 0,5mm -> 90 ?/km
Maximum Conductor resistance Ø 0,6mm -> 63,9 ?/km
Test voltage Cond /Cond Ø 0,4mm -> 0,6KV (1 min)
Test voltage Cond /Cond Ø 0,5mm& Ø 0,6mm -> 1,15KV (1 min)
Test voltage Cond /screen -> 1,5 KV (1 min)
Minimum Insulation resistance -> 5000M?.km
Maximum Mutual capacitance -> 57,5 nF/km