- Telephone Cable with cellular polyethylene insulation, jelly filled with petroleum jelly and a polyethylene coating.
- For use in the Local Distribution network.
- Insulated conductors uniformly twisted together to form a pair.
- The water resistant filling compound is applied to the air spaces within the cable core to provide the water-proofnes
- Wrapping is applied over the cable core.
- A flat aluminium foil coated with copolymer on both sides is applied longitudinally over the core covering as screen.
- Black linear-low density polyethylene compound is extruded over the screen.
Physical Description
Conductors | Solid annealed bare copper conductors conforming to CCITT Yellow Book Vol. III – 2-G.541 b article, IEC 28 and ASTM B3 |
Insulation | Foam-skin polyolefin conforming to ASDM D1248 to BS 6234 Type 03 |
Cable Assembly | Twisted pairs, cabled into sub-units, cabled in a circular form |
Color Code | As indicated below |
Filling Compound | Water resistant filling compound, applied to the gaps between the pairs |
Tape wrap | Non hygroscopic polyester tape, wrapped with 30% overlap |
Identifcation tape | A suitable tape, durably marked with the manufacturer’s name, year of manufacture and type of cable is placed under the core covering |
Flooding compound | Water resistant ‑flooding compound, applied between the core wrap and the aluminum foil |
Screen ( Shield) | Copolymer coated aluminum foil having thickness of 0.3mm, bonded to the outer jacket, conforming to ASTM B736 |
Outer Jacket | Black PE compound |
Mechanical Parameters of basic conductors
Nominal Conductor Diameter (mm) | 0.5 |
Maximum Conductor Diameter (mm) | 0.51 |
Minimum Conductor Elongation, % | 15 |
Insulated Conductor diameter (mm) | 0.9 |
Insulation ultimate tensile force minimum (N) | 2 |
Electrical Properties
DC resistance @20˚C Ohm/km Maximum Average | 91 |
DC resistance @20˚C Ohm/km Maximum for 1% of cases | 96 |
Mutual Capacitance nF/km, max Average | 53 |
Mutual Capacitance nF/km, max for 1% of cases | 60 |
Pair to pair capacitance unbalance, pF max | 275 |
Insulation Resistance, 500V DC Minimum Mohm.km | 1500 |
Colour codes of unit
Pair No | Colour of conductor insulation | |
| A – wire | B – wire |
1 | White | Blue |
2 | White | Orange |
3 | White | Green |
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