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

K27
  • 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