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
• 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