G7621 Trackside Communications Cables


The cables are designed for installation in trackside bracket runs and for use in open locations (type1) or in tunnels or underground locations (type2).


  • LUL Spec G7621 A2 type 1 (for PVC sheath)
  • LUL Spec G7621 A2 type 2 (for LSZH sheath)

Cable Construction

G7621 Trackside Communications Cables Railway Cable
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
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