Telephone Cables
Outdoor Telephone Cables Indoor Telephone Cables Indoor/Outdoor Telephone Cables Special Telephone Cables

Ordering Information

Solid PE Insulated & LAP Sheathed Air Core Cables to IEC 60708

Application

The cables are designed for use in access or trunk networks, from telephone exchange to subscriber area. The

cables are suitable for installation in ducts, direct burial in the ground and also for aerial installation with integral

suspension strand. An armoured option is offered for direct burial installations. A figure-8 self support option is

offered for aerial installation

Standards

IEC 60708IEC 60708

IEC 60708

Construction

Conductors: Solid annealed bare copper, 0.4/0.5/0.6/0.8mm as per BS 6360/IEC 60228 Class 1

Insulation: Solid polyethylene as per IEC 60708/BS EN 50290-2-23/BS 6234/ASTM D 1248/NFC 32-060/VDE

0207

TwistedPairs: Insulated conductors are twisted into pairs with varying lay length to minimize crosstalk

CablingElement: Pairs or Quads

CableCore Assembly: Cables with 100 pairs or less are composed of 10-pair sub-units; cables with over 100

pairs are composed of 50 or 100-pair units. Any extra pairs form a separate unit. Units are identified by colour

coded binders. Standard construction is per IEC 60708 in Cable Make Up Diagram

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: 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 electrical shielding coverage and ensure a barrier

against water vapor. In cables with more than 200 pairs, the aluminum tape may be corrugated for improved

cable flexibility

Sheath: Black low density polyethylene as per BS 6234/IEC 60708/ASTM D 1248, 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

SparePairs (optional): Spare pairs may be incorporated in large pair cables

Continuity Wire (optional): Tinned copper drain wire may be longitudinally laid to ensure electrical continuity of

the screen

Optional Construction

Armoured Cable: Steel wire armour or corrugated steel tape armour is applied over an optional inner

polyethylene sheath.For steel tape version, the steel tape is 0.2/0.5mm thick, being coated with a PE copolymer

and applied with an overlap. An outer polyethylene sheath is applied over the armour

Self-SupportCables

Per CW 1252. A 7-strand galvanized steel strand is used as support wire. Black polyethylene

IEC 60708IEC 60708

sheath covers both core and support wire in a figure-8 construction

Electrical Properties

Nominal Conductor Diameter mm 0.4 0.5 0.6 0.8
Conductor Gauge Size AWG 26 24 - 20
Conductor Size mm2 0.126 0.196 0.283 0.5
Maximum Average Conductor Resistance @20°C Ω/km 143 91 63 34.6
Minimum Insulation Resistance @500V DC MΩ.km 5000 5000 5000 5000
Maximum Average Mutual Capacitance @800Hz nF/km 53 53 56 59
Maximum Individual Mutual Capacitance @800Hz (for 99% cases) nF/km 60 60 60 64
Maximum Individual Capacitance Unbalance @800Hz pair-to-pair pF/500m 250 250 250 160
Maximum Individual Capacitance Unbalance @800Hz pair-to-pair (for 95% cases) pF/500m 150 150 150 100
Maximum Individual Capacitance Unbalance @800Hz pair-to-ground pF/500m 1700 1700 1700 1700
Maximum Individual Capacitance Unbalance @800Hz pair-to-ground
(for 95% cases) 		pF/500m 1000 1000 1000 1000
Maximum Conductor Loop Resistance @20°C Ω/km 300 192 130 73
Impedance @1KHz Ω 994 796 665 500
Impedance @100KHz Ω 147 134 127 124
Impedance @512KHz Ω 120 118 117.5 116.5
Impedance @1MHz Ω 117 115 114.5 113.5
Maximum Average Attenuation @0.8KHz dB/km 1.64 1.30 1.1 0.9
Maximum Average Attenuation @1KHz dB/km 1.68 1.35 1.14 0.93
Maximum Average Attenuation @3KHz dB/km 3.18 2.52 2.3 1.74
Maximum Average Attenuation @150KHz dB/km 11.4 8.3 7.2 5.7
Maximum Average Attenuation @772KHz dB/km 24.3 19.4 17.4 13.1
Maximum Average Attenuation @1000KHz dB/km 27.1 21.4 18.5 13.7
Dielectric Strength
Conductor to Conductor (1min) V DC 500 500 500 500
Conductor to Screen (1min) V DC 1000 1000 1000 1000
Nominal Insulation Thickness mm 0.175 0.20 0.25 0.3
Nominal Insulated Conductor Diameter mm 0.75 0.90 1.1 1.4
Mechanical and Thermal Properties

Temperature range during operation (fixed state): -30°C – +70°C

Temperaturerange during installation (mobile state): -20°C – +50°C

Minimumbending radius: 10 x Overall Diameter (unarmoured cables);15 x Overall Diameter (armoured cables)

Colour Code

Standard colour code is per IEC 60708 given in Colour Code Chart

Dimensions And Weight

Solid PE Insulated & LAP Sheathed Air Core Cable to IEC 60708

Cable Code Number of Pairs Nominal Sheath Thickness
mm 		Nominal Overall Diameter
mm 		Nominal Weight
kg/km
0.4mm Conductor, 0.75mm Insulated Wire
TP708-2Y(L)2Y-10P04 10 1.5 9 71
TP708-2Y(L)2Y-20P04 20 1.5 10 107
TP708-2Y(L)2Y-30P04 30 1.5 11 143
TP708-2Y(L)2Y-50P04 50 1.5 13 211
TP708-2Y(L)2Y-70P04 70 1.5 15 278
TP708-2Y(L)2Y-100P04 100 1.5 17 380
TP708-2Y(L)2Y-150P04 150 1.5 21 548
TP708-2Y(L)2Y-200P04 200 1.8 23 708
TP708-2Y(L)2Y-300P04 300 1.8 28 1034
TP708-2Y(L)2Y-400P04 400 1.8 31 1358
TP708-2Y(L)2Y-500P04 500 2.0 35 1703
TP708-2Y(L)2Y-600P04 600 2.0 38 2016
TP708-2Y(L)2Y-800P04 800 2.5 43 2639
TP708-2Y(L)2Y-900P04 900 2.5 46 2961
TP708-2Y(L)2Y-1000P04 1000 2.5 48 3264
TP708-2Y(L)2Y-1200P04 1200 2.8 52 3873
TP708-2Y(L)2Y-1500P04 1500 2.8 58 4819
TP708-2Y(L)2Y-1800P04 1800 3.2 63 5777
TP708-2Y(L)2Y-2100P04 2100 3.2 68 6731
TP708-2Y(L)2Y-2400P04 2400 3.5 72 7645
TP708-2Y(L)2Y-2700P04 2700 3.5 76 8556
TP708-2Y(L)2Y-3000P04 3000 3.5 80 9466


1 2