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.
Reference Standards
- Fire retardant: NBN C 30-004 F2
- Fire resistant: NBN 713-020 Add.3. -RF 1h
Cable Construction
| Conductors |
Solid copper conductor, 0.5mm^2 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 |
mm^2 |
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 |
Nominal Overall Diameter |
Nominal Weight |
| Inner |
Inter. |
Outer |
| |
|
mm |
mm |
mm |
mm |
kg/km |
| 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 |
