MD4 Fire Resisting Telecom Cables (CR1-C1 Class)

Application

The MD4 Fire Resisting Telecom Cables (CR1-C1 Class) 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