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MD4 Fire Resisting Telecom Cables (CR1-C1 Class)

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