Type C3 is a screened railway signalling tail cable used for TPWS equipment connections where the specified circuit requires this construction. Two 2.5 mm² class 5 tinned copper cores have GP4 EPR insulation. An aluminium tape screen and flexible tinned copper drain wire sit beneath the RS2 HDPCP sheath. The screen termination and cable routing form part of the complete signalling-system design.
NR/PS/SIG/00005(formerly RT/E/PS/00005)
Electrical Characteristics at 20℃Conductors: Tinned stranded copper, class 5 according to IEC 60228 & BS 6360.
Insulation: EPR Type GP4 to BS 7655.
Screen: Aluminium tape.
Drain Wire: 2.5 mm fl exible tinned copper.
Sheath: HDPCP Type RS2 to BS 7655.
| Nominal Conductor Cross Section | mm | 2.5 |
| Maximum DC Conductor Resistance | Ω/km | 8.21 |
| Minimum Noise Reduction | dB | 60 |
| Voltage Rating | KV | 0.65/1.1 |
| Nominal Insulation Thickness | mm | 1.05 |
Minimum Bending Radius: 6×OD (static); 15×OD (dynamic)
Temperature Range: -25℃ to +85℃ (during operation); -10℃ to +85℃ (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 | Overall Diameter Min/Max mm | Nominal Weight kg/km |
|---|---|---|---|---|---|
| Type C3 | |||||
| BRAIL C3-3G(St)5G-1P2.5S | 1×2×2.5 | 50/0.25 | 3.8 | 15.0/20.0 | 390 |
Routine test voltage: 2.5kV for 5 minutes
Two insulated 2.5 mm² class 5 conductors in the listed 1 × 2 × 2.5 arrangement.
Aluminium tape screen with a separate tinned copper drain wire.
HDPCP sheath and a 15–20 mm listed overall-diameter range.
Match the cable to the TPWS equipment specification and termination drawing. Provide continuity and bonding of the screen as required by that design, keeping the drain wire distinct from the signal cores. Select glands for the listed diameter range and allow the specified bend radius. Evaluate interference performance as part of the installed circuit.
Type C1 & C2 Railway Signalling Tail Cable, 2.5 mm² Class 5 Copper
Type B1 & B2 Railway Signalling Cable, EPR Insulation and HDPCP Sheath
How many signal cores are listed?
The cable has two insulated 2.5 mm² signal cores, with a separate drain wire.
What forms the screen?
An aluminium tape screen surrounds the insulated core assembly, with a tinned copper drain wire for the specified termination arrangement.
Is C3 the same as C2?
Both use class 5 tinned copper, EPR insulation and HDPCP sheath. C3 adds the screen and drain-wire construction for its specified application.
Can the drain wire be treated as an extra signal core?
It belongs to the screening arrangement. Use it according to the equipment's screen and bonding drawing.
What does a TPWS cable enquiry need?
State Type C3, required lengths, equipment interface, termination details and applicable railway acceptance requirements.
