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MD4 Fire Resisting Telecom Cables (CR1-C1 Class)

Application

MD4 Fire Resisting Telecom Cables are telecommunication cables for tunnel application. The cables are

halogen free fi re resistant, inductive protected and armoured.

Reference 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

Note: The parameters listed above are nominal values as per cable standards. Actual values may vary due to material and manufacturing process variations. For precise specifications or customized requirements, please contact us for further information