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Telephone cable
Solid PE Insulated & PE Sheathed Air Core Cables to CW 1171
Application
The cables are designed for use as subscriber distribution cables and as connection between central offices in local access networks. The cables are unfilled and capable of being pressurized when installed. The cables are suitable for installation in ducts.
Standards

• CW 1171 (For unscreened cable)
• CW 1179 (For screened cable)
• CW 1252 (For self-supporting cable)
Construction
Conductors: Solid annealed bare copper, 0.32/0.4/0.5/0.63/0.9mm as per BS 6360/IEC 60228 Class 1
Insulation: Solid polyethylene as per BS EN 50290-2-23/BS 6234/IEC 60708
Twisted Pairs: Insulated conductors are twisted into pairs with varying lay length to minimize crosstalk.
Cabling Element: Twisted Pairs
Cable Core Assembly: Cables with 100 pairs or less are composed of 25-pair units or 12/13-pair units; cables with over 100 pairs are composed of 25, 50 or 100-pair units. Standard construction is per CW 1171 given in Cable Make Up Chart
Core Wrapping: One or more non-hygroscopic polyester tapes are helically or longitudinally laid with an overlap. These tapes furnish thermal, mechanical as well as high dielectric protection between shielding and individual conductors
Moisture Barrier (optional):A layer of aluminium tape (0.15mm) coated with PE-copolymer on one or both sides is applied longitudinally with overlap over the cable core to provide shielding coverage and ensure a barrier against water vapor
Sheath: Black low density polyethylene as per BS 6234/IEC 60708, being able to withstand exposure to sunlight, temperature variations, ground chemicals and other environmental contaminants
Ripcord:Ripcord may be provided for slitting the sheath longitudinally to facilitate its removal
Spare Pairs (optional):Spare pairs may be incorporated for 200 and larger pair cables
Continuity Wire (optional): Tinned copper drain wire may be longitudinally laid to ensure electrical continuity of the screen
Electrical & Mechanical Properties

Nominal Conductor Diametermm0.320.40.50.630.9Conductor Gauge SizeAWG2826242219Conductor Sizemm20.080.1260.1960.3120.636Maximum Average Conductor Resistance @20°C/km223143915828Minimum Insulation Resistance @500V DCM.km65006500650065006500Maximum Average Mutual Capacitance @800HznF/km53/68*53535659Maximum Individual Mutual Capacitance @800Hz (for 99% cases)nF/km60/75*60606064Maximum Individual Capacitance Unbalance @800Hz pair-to-pairpF/500m275275275275275Maximum Conductor Loop Resistance @20°C/km47030019211460Impedance @1KHz 1000994796660445Impedance @100KHz 156147134125122Impedance @512KHz 122120118117116Impedance @1MHz 120117115114113Maximum Average Attenuation @0.8KHzdB/km1.761.641.301.040.74Maximum Average Attenuation @1KHzdB/km1.81.681.351.080.76Maximum Average Attenuation @3KHzdB/km3.43.182.522.011.42Maximum Average Attenuation @150KHzdB/km16.811.48.36.24.4Maximum Average Attenuation @772KHzdB/km29.524.319.415.410.8Maximum Average Attenuation @1000KHzdB/km33.527.121.417.512.8Dielectric Strength Conductor to Conductor (3secs)V DC500500500500500Nominal Insulation Thicknessmm0.145/0.08**0.1750.200.260.3Nominal Insulated Conductor Diametermm0.61/0.48**0.750.901.151.5

* Mutual capacitance values may be increased by 3% for cables with a nominal number of pairs less than 400.
The values apply to 4000 and 4800 pairs 0.32mm cable only.
Mechanical and Thermal Properties
Temperature range during operation (fixed state): -30°C - +70°C
Temperature range during installation (mobile state): -20°C - +50°C
Minimum bending radius: 10 x Overall Diameter (unarmoured cables);15 x Overall Diameter (armoured cables)
Colour Code Standard colour code is per CW 1171 given in Colour Code Chart
Dimensions And Weight Solid PE Insulated & PE Sheathed Air Core Cables to CW 1171
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