SPFB Speed Control System Cables
Application
The cables are used for the train speed control system (French system KVB). The cables are laid along railway lines and connect the speed sensors (located between the rails) to the encoder located inside the trackside equipment shelter.
Standards
● SNCF CT 446
Construction
Conductors
Class 2 stranded tinned copper.
Insulation
Solid polyethylene.
Cabling Element
Twisted pair.
Inner Sheath
Low density polyethylene.
Armour
Galvanized steel braid armour.
Outer Sheath
Flame Retardant PVC.
Electrical Characteristics at 20℃
| Nominal Conductor Diameter |
mm |
0.8 |
| Nominal Cross Section Area |
mm² |
0.5 |
| Maximum Conductor Resistance (DC) |
Ω/km |
36 |
| Characteristic Impedance @100KHz |
Ω |
120 |
| Maximum Attenuation @50KHz |
dB/km |
5 |
| Nominal Insulation Thickness |
mm |
0.55 |
| Operating Voltage |
V |
500 |
Mechanical and Thermal Properties
Minimum Bending Radius: 8×OD (static); 16×OD (dynamic)
Temperature Range: -30℃ to +70℃ (during operation); -20℃ to +50℃ (during installation) |
