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.
Standard
- RATP K27 specifi cation
- Fire resistant: class CR1
- No fi re propagation: class C1 RATP (<30cm)
Cable Construction
 |
 |
- Conductors: Class 1 solid conductor from 1.5mm to 4mm; class 2 stranded conductor for 6mm.
- 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 | mm | 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 |
