Railway Cables

MD4 Fire Resisting Telecom Cables (CR1-C1 Class)

Application

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

Standards

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

Construction

Conductors
Solid copper conductor, 0.5mm² 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
mm²
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
mm
Nominal Overall
Diameter
mm
Nominal Weight
kg/km
Inner
Inter.
Outer
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