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
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CT2328 Type (Main Cables)
- Conductors: Solid copper, 0.8mm nominal diameter
- Insulat ion: 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 mm |
Nominal Overall Diameter mm |
Nominal Weight kg/km |
||
|---|---|---|---|---|---|---|
| Inner | Interm. | Outer | ||||
| 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 mm |
Nominal Overall Diameter mm |
Nominal Weight kg/km |
||
|---|---|---|---|---|---|---|
| Inner | Interm. | Outer | ||||
| 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 mm |
Nominal Overall Diameter mm |
Nominal Weight kg/km |
|
|---|---|---|---|---|---|
| Inner | Outer | ||||
| 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 |
