|
Product Description
Polythene insulated jelly filled, un-armored Telecommunication Cables (10 to 2400
pairs with conductors’ dia of 0.4mm, 0.5mm, 0.6mm and 0.9mm) are manufactured on
Pakistan Telecommunication Company specifications LW-33 with reference to various
international standards and specifications. Premier Cables offers a wide range of
Telephone cables.
Application
This cable is usually used for direct buried applications for distribution in the
exchange areas as local network and interexchange applications. It is a cable with
solid polyethylene insulated unit twin jelly filled construction.
Construction
- Conductor:
Solid annealed copperith conductor sizes of 0.4 & 0.6mm.
- Insulation:
Colored high molecular weight solid High Density Polyethylene.
- Color Coding:
Cables are fully color coded in accordance with PIC even count color code.
- Twining/pairing:
Two colored insulated conductors are uniformly twisted together to form a pair.
Varying lay length is designed to minimize the cross talk and capacitance unbalance.
- Stranding / Cabling:
Twisted pairs are assembled into unit of 25 pairs. When desired for lay-up reason,
the units are divided into two or more sub-units, which are bind with durably colored
polyethylene tapes to form a compact and circular cable.
- Filling Compound:
The water resistant filling compound is applied to the air space within the cable
core.
- Core Covering:
A non-hygroscopic and dielectric Polyester Tape and Water Blocking Tape are applied
helically having a suitable overlap.
- Flooding Compound:
Sufficient flooding compound is applied between the core wrap and shield.
- Moisture Barrier Inner Sheath:
An aluminum tape with co-polymer coating is applied over the cable core and then
sheathed with black polyethylene compound.
- Jacket:
Black High Molecular weight low density polyethylene compound.
- Identification:
A plastic tape, duly marked with the manufacturers name, year of manufacture and
cable size, if required, is placed under the core covering. Alternatively, thesse
details may be printed on the outer jacket of cable.
|
|
|
|
Cable Construction Detail
|
|
 |
|
|
Physical and Electrical Tests |
|
Parameters |
Conductor Size (mm) |
|
0.4 |
0.5 |
0.6 |
0.9 |
Conductor Resistance
(per K.M in Ohms) individual |
145 |
- |
63 |
- |
|
Conductor Resistance unbalance |
|
|
Individual |
4 % |
- |
4 % |
- |
|
Average |
1.5 % |
- |
1.5 % |
- |
|
Conductor Elongation (Minimum percent) |
15 % |
- |
15 % |
- |
|
Tensile Strength |
200 MPa |
- |
200 MPa |
- |
Attenuation at 150 Khz (dB/km)
shall not exceed |
-11.2 |
- |
6.8 |
- |
Attenuation at 1500 Khz (dB/km)
shall not exceed |
-29.4 |
- |
19.5 |
- |
|
Insulation |
Solid (MDPE/HDPE) |
|
Tensile Strength |
16.5 MPa |
- |
16.5 MPa |
- |
|
Ultimate Elongation |
350% |
- |
350% |
- |
|
Spark Test |
2.5KV RMS AC for 3 seconds (PP),
10KV RMS AC for 3 seconds (PS) |
|
Retraction of Insulation(shall not exceed) |
2.5mm after 1 min. |
|
Resistance to Compression |
200N, 12 Volt DC |
|
Insulation Resistance at 500V |
5000 Mega Ohm / Km |
|
Construction |
25 Pair Unit |
|
Filling Compound |
Water Resistant Compound (Petro Jelly) |
|
Core wrap |
Polyester Tape |
|
Moisture Barrier |
Poly-Aluminum |
|
Sheath / Jacket |
HDPE |
|
Mutual Capacitance (nF/KM) |
|
|
Individual |
52 ± 4 |
|
Average |
52 ± 3 |
|
Capacitance Unbalance (pF/KM)pair to pair |
|
|
Individual |
333 |
|
Average |
83.3 |
|
Cross Talk |
RMS average -73.0 dB |
|
Shield Resistance |
62.5 Ohm per Drum |
|
| |
|
|