MD4 Medium Distance Trackside Telecom Cables

Application

The MD4 railway 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