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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 |