Railway Cables

K27 Fire Resisting Control Cables (CR1-C1 Class)

Application

The cables are designed for provide circuit integrity for safety lightning, smoke extraction, ventilation, emergency telephone and exits during fi re for underground railways.

Standards

● RATP K27 specifi cation
● Fire resistant: class CR1
● No fi re propagation: class C1 RATP (<30cm)

Construction

Conductors
Class 1 solid conductor from 1.5mm² to 4mm²; class 2 stranded conductor for 6mm².

Insulation
Silicone rubber insulation.

Stranding
Cores are helically stranded in concentric layers.

Inner Sheath
LSZH.

Armour
Two layers of steel tape.

Outer Sheath
LSZH.

Electrical Characteristics at 20℃

Number of strands/Nominal Conductor Diameter
mm
7/1.04
1/1.39
1/1.79
1/2.25
Nominal Cross Section Area
mm²
6
1.5
2.5
4
Nominal Insulation Thickness
mm
1.0
0.8
1.0
1.0
Operating Voltage
V
300/500

Mechanical and Thermal Properties

Minimum Bending Radius: 5×OD (static); 10×OD (dynamic)
Temperature Range: -10℃ to +90℃ (during operation); -10℃ to +60℃ (during installation)

Dimensions And Weight

Cable Code
Number of
Cores
Nominal Sheath Thickness
mm
Maximum Overall
Diameter
mm
Nominal
Weight
kg/km
Inner
Outer

7/1.04mm Conductor, 4.76mm Insulated Wire

RS/K27-SZ1F3Z1-U(AS+)-2G6

2

1.0

1.5

17.0

406

1/1.39mm Conductor, 2.99mm Insulated Wire

RS/K27-SZ1F3Z1-U(AS+)-2G1.5

2

1.0

1.5

11.3

200

RS/K27-SZ1F3Z1-U(AS+)-3G1.5

3

1.0

1.5

12.5

237

RS/K27-SZ1F3Z1-U(AS+)-12G1.5

12

1.0

1.5

18.9

596

1/1.79mm Conductor, 3.79mm Insulated Wire

RS/K27-SZ1F3Z1-U(AS+)-2G2.5

2

1.0

1.5

13.2

265

RS/K27-SZ1F3Z1-U(AS+)-3G2.5

3

1.0

1.5

13.5

309

1/2.25mm Conductor, 4.26mm Insulated wire

RS/K27-SZ1F3Z1-U(AS+)-2G4

2

1.0

1.5

14.7

325

RS/K27-SZ1F3Z1-U(AS+)-3G4

3

1.0

1.5

15.6

411