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