Railway Cables

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)

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