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MD4 Medium Distance Trackside Telecom 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