MD4 Medium Distance Trackside Telecom Cables
Application
The cables are designed for long distance of over 10km telecommunications alongside railway lines.
Standard
- SNCF CT 2328 (Main cables) /SNCT CT 2329 (Branch cables)
Cable Construction
CT2328 Type (Main Cables)
| Conductors |
Solid copper, 0.8mm nominal diameter |
| Insulation |
Coloured sol id polyethylene. |
| Cabling Element |
Four conductors are twisted together to form a quad. |
| Possible Harness |
Aluminium screen. |
| Filling |
Petroleum jelly. |
| Screen |
PE-copolymer coated aluminium tape. |
| Drain Wire |
Tinned drain wire. |
| Inner Sheath |
Low density polyethylene. |
| Screen |
One corrugated copper tape. |
| Intermediate Sheath |
Low density polyethylene. |
| Armour |
Two helically applied steel tapes. |
| Outer Sheath |
Low density polyethylene. |
Optional
CT2329 Type (Branch Cables): For CT 2329 type, the cables have PE inner sheath, double corrugated steel tapes armour and PE outer sheath, without aluminium tape screen & copper tape.
Electrical Characteristics at 20℃
| Nominal Conductor Diameter |
mm |
0.8 |
| Maximum Conductor Resistance (DC) |
Ω/km |
73.4 |
| Minimum Insulation Resistance @500 V DC (3mins) |
MΩ.km |
15000 |
| Mutual Capacitance @800Hz |
nF/km |
51 |
| Average Capacitance Unbalance |
|
|
| Main Cables |
|
|
| In quad |
pF/1450 m |
50 |
| Between quads |
pF/1450 m |
30 |
| Real-ground |
pF/1450 m |
200 |
| Branch Cables |
|
|
| In quad |
pF/1450 m |
100 |
| Between quads |
pF/1450 m |
100 |
| Real-ground |
pF/1450 m |
700 |
| Maximum Attenuation @1MHz |
dB/km |
15.9 |
| Maximum Reduction Factor for Main Cables @100V/km 50Hz |
|
|
| 14 quads |
|
0.3 |
| 21 quads |
|
0.2 |
| 28 quads |
|
0.18 |
| Dielectric Strength (DC voltage 1min) |
|
|
| Conductor to Conductor |
V |
1500 |
| Conductor to Screen |
V |
3000 |
Mechanical and Thermal Properties
- Bending Radius: 10×OD
- Temperature Range: -40℃ to +60℃ (during operation); -10℃ +60℃ (during installation)
Dimensions and Weight
CT2328 (Main cable)
| Cable Code |
No. of Quads |
Nominal Sheath Thickness |
Nominal Overall Diameter |
Nominal Weight |
| Inner |
Interm. |
Outer |
| |
|
mm |
mm |
mm |
mm |
kg/km |
| 0.8mm Conductor, 1.27mm Insulated Wire |
| RS2328-2Y2Y(K)2YB2Y-14Q0.8 |
14 |
1.2 |
1.1 |
2.2 |
29.2 |
1332 |
| RS2328-2Y2Y(K)2YB2Y-21Q0.8 |
21 |
1.3 |
1.3 |
2.5 |
31.3 |
1655 |
| RS2328-2Y2Y(K)2YB2Y-28Q0.8 |
28 |
1.3 |
1.3 |
2.5 |
35.5 |
2013 |
CT2328 (Main cables with screened quads)
| Cable Code |
No. of Quads |
Nominal Sheath Thickness |
Nominal Overall Diameter |
Nominal Weight |
| Inner |
Interm. |
Outer |
| |
|
mm |
mm |
mm |
mm |
kg/km |
| 0.8mm Conductor, 1.27mm Insulated Wire |
| RS2328-2Y(L)2Y(K)2YB2Y-(14+7)Q0.8 |
14+7screen Quads |
1.3 |
1.3 |
2.5 |
32.7 |
1765 |
| RS2328-2Y(L)2Y(K)2YB2Y-(18+3)Q0.8 |
18+3screen Quads |
1.3 |
1.3 |
2.5 |
32.9 |
1783 |
CT2329 (Branch cable)
| Cable Code |
No. of Quads |
Nominal Sheath Thickness |
Nominal Overall Diameter |
Nominal Weight |
| Inner |
Outer |
| |
|
mm |
mm |
mm |
kg/km |
| 0.8mm Conductor, 1.4mm Insulated Wire |
| RS2329-2Y2YB2Y-4Q0.8 |
4 |
1.0 |
1.7 |
16.4 |
339 |
| RS2329-2Y2YB2Y-8Q0.8 |
8 |
1.2 |
1.8 |
18.8 |
477 |
| RS2329-2Y2YB2Y-14Q0.8 |
14 |
1.2 |
2.2 |
22.3 |
686 |
