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.
SNCF CT 446
Electrical Characteristics at 20℃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.
| Nominal Conductor Diameter | mm | 0.8 |
| Nominal Cross Section Area | mm | 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 |
Minimum Bending Radius: 8×OD (static); 16×OD (dynamic)
Temperature Range: -30℃ to +70℃ (during operation); -20℃ to +50℃ (during installation)
| Cable Code | No. of cores& Nominal Conductor Cross Sectional Area No.×mm | No. & Nominal Diameter of Strands No/mm | Nominal Sheath Thickness mm | Nominal Overall Diameter mm | Nominal Weight kg/km | |
|---|---|---|---|---|---|---|
| Inner | Outer | |||||
| BRAIL SPFB-2Y2Y(SWB)2Y-2C0.5S | 2 x 0.5 | 7/0.32 | 1.0 | 1.5 | 9.1 | 97 |
