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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 |
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| 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 |