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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

K27 Fire Resisting Control Cables (CR1-C1 Class)

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