MD4 Fire Resisting Telecom Cables (CR1-C1 Class)


The cables are telecommunication cables for tunnel application. The cables are halogen free fi re resistant, inductive protected and armoured.


  • Fire retardant: NBN C 30-004 F2
  • Fire resistant: NBN 713-020 Add.3. -RF 1h

Cable Construction

MD4 Fire Resisting Telecom Cables Railway Cable
Conductors Solid copper conductor, 0.5mm^2 nominal cross section area.
Insulation Mica-tape + LSZH insulation.
Cabling Element Four conductors are twisted to form a quad.
Stranding Quads are helically stranded in concentric layers.
Core Wrapping Plastic tape(s) with overlapping.
Inner Sheath LSZH sheath.
Screen Copper tape screen.
Intermediate Sheath LSZH sheath.
Armour Two layer of steel tape.
Outer Sheath LSZH sheath.

Electrical Characteristics at 20℃

Nominal Conductor Diameter mm 0.8
Nominal Cross Section Area mm^2 0.5
Nominal Insulation Thickness mm 0.5
Maximum Conductor Resistance (DC) Ω/km 36.7
Minimum Insulation Resistance MΩ.km 100
Maximum Capacitance nF/km 120
Voltage Test 2 mins KVac 0.5

Mechanical and Thermal Properties

  • Minimum Bending Radius: 10×OD
  • Temperature Range: -40℃ to +60℃ (during operation); -10℃ +60℃ (during installation)

Dimensions and Weight

Cable Code No. of Quads Nominal Sheath Thickness Nominal Overall Diameter Nominal Weight
Inner Inter. Outer
    mm mm mm mm kg/km
0.8mm Conductor, 1.8mm Insulated Wire
RS/MD4-HH(K)HBH-7Q0.8-FR 7 1.0 1.0 1.8 30.7 1074