G7621 Trackside Communications Cables
Application
The cables are designed for installation in trackside bracket runs and for use in open locations (type1) or in tunnels or underground locations (type2).
Reference Standards
- LUL Spec G7621 A2 type 1 (for PVC sheath)
- LUL Spec G7621 A2 type 2 (for LSZH sheath)
Cable Construction
| Conductors |
Solid plain copper, 0.63/0.9 mm nominal diameter. |
| Insulation |
Cellular polyethylene. |
| Cabling Element |
Two insulated conductors are twisted together to form a pair. |
| Core Wrapping |
Non-hygroscopic plastic tape with overlapping. |
| Outer Sheath |
PVC/LSZH sheath, coloured violet. |
Core Identification
- 1 Pair Cable: Blue / White
- 3 Pair Cable: Blue / White; Orange / White; Green / White
Electrical Characteristics at 20℃
| Nominal Conductor Diameter |
mm |
0.63 |
0.9 |
| Maximum Conductor Resistance |
|
|
|
| Average Value |
Ω/km |
57.5 |
28 |
| Individual Value |
Ω/km |
59 |
29 |
| Minimum Insulation Resistance @500 V DC |
MΩ.km |
1500 |
1500 |
| Maximum Average Mutual Capacitance |
nF/km |
59 |
59 |
| Maximum Average Capacitance Unbalance |
|
|
|
| Pair to Pair |
pF/460m |
100 |
100 |
| Pair to Earth |
pF/460m |
1200 |
1200 |
Mechanical and Thermal Properties
- Minimum Bending Radius: 7.5×OD
- Temperature Range: -30℃ to +70℃ (during operation); -10℃ +55℃ (during installation)
Dimensions and Weight
| Cable Code |
No. of pairs |
Nominal Thickness of Sheath |
Nominal Overall Diameter |
Nominal Weight |
| |
|
mm |
mm |
kg/km |
| 0.63mm Conductor, 1.15mm Insulated Wire |
| RS7621A2/T1-02YY-1P0.63 |
1 |
2.5 |
7.0 |
60 |
| RS7621A2/T1-02YY-3P0.63 |
3 |
2.5 |
9.0 |
90 |
| 0.9mm Conductor, 1.5mm Insulated Wire |
| RS7621A2/T1-02YY-1P0.9 |
1 |
2.5 |
8.0 |
70 |
| RS7621A2/T1-02YY-3P0.9 |
3 |
2.5 |
10.0 |
120 |
