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SPFB Speed Control System Cables

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)

Dimensions And Weight

Cable Code No. of cores& Nominal
Conductor Cross
Sectional Area
No.×mm²
No. & Nominal
Diameter of
Strands
No/mm
Nominal Sheath Thickness
mm
Nominal Overall
Diameter
mm
Nominal Weight
kg/km
Inner Outer
RS/SPFB-2Y2Y(SWB)2Y-2C0.5S 2 x 0.5 7/0.32 1.0 1.5 9.1 97