SPFB Speed Control System Cables

Application

TheSPFB Speed Control System 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