K27 Fire Resisting Control Cables (CR1-C1 Class)
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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) |
