MD4 Medium Distance Trackside Telecom Cables
Application
The cables are designed for long distance of over 10km telecommunications alongside railway lines.
Standards
● SNCF CT 2328 (Main cables) /SNCT CT 2329 (Branch cables)
Construction
CT2328 Type (Main Cables)
Conductors
Sol id 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
Minimum Bending Radius: 10×OD
Temperature Range: -40℃ to +60℃ (during operation); -10℃ +60℃ (during installation) |
