SERIES 278

Presentation

Cables of series 278 are used for indoor telephone installations.

Reference standards

UTE C 93-526 and UTE C 93-527 and FRANCE TELECOM specifications

Cable structure

1- Conductors :

Conductors consist of a solid copper with a nominal diameter of0.4; 0.5 or 0.6 mm.

2- Insulation of conductors :

Conductors are insulated by a colored solid polyethylene layer.

More info

3- Standing :

. 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.

4- Core wrapping :

A dielectric polyester tape is applied over the cable core.

5- Screen

Over the wrapped core cable is applied a plastic coated aluminum foil.

6- Drain wire

It consists of tinned copper wire with a nominal diameter of 0,5 mm.

7- Outer sheath

The outer sheath consists of flame retarding and unleaded PVC

ELECTRICAL CHARACTERISTICS

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