K27 Fire Resisting Control Cables (CR1-C1 Class)

Application

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