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

Ordering Information

Foam Skin Insulated & LAP Sheathed Jelly Filled Cables to IEC60708

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.Jelly filled option is for subscriber’s cables installed underground or along the edge of pavement. An armoured option is offered for direct burial installations. A figure-8 self support option is offered for aerial installation.

Standards

IEC 60708

Construction

IEC60708

IEC60708

Conductors

Solid annealed bare copper, 0.4/0.5/0.6/0.63/0.8/0.9 mm as per class 1 of IEC 60228 & ASTM B-3

Insulation

Foam Skin which is a composite polyethylene insulation made of an inner cellular layer and an outer solid skin, 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

Twisted Pairs

Cable Core 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 given 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 100% 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

Filling (optional)

The cable core interstices are filled with petroleum jelly to avoid longitudinal water penetration within the cable. The water resistant filling compound is applied to the air space between non-hygroscopic tape and shield,shield and sheath within the cable core

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

Spare Pairs (optional)

Spare pairs may be incorporated for 200 and larger pair cables

Continuity Wire (optional)

One 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 0.2/0.5mm thick steel tape is coated with a copolymer and applied with an overlap. An outer polyethylene sheath is applied over the armour

Self-Support Cables

A 7-strand galvanized steel strand is used as support wire. Black polyethylene sheath covers both core and support wire in a figure-8 construction

Electrical Properties

Nominal Conductor Diameter mm 0.4 0.5 0.6 0.63 0.8 0.9
Conductor Gauge Size AWG 26 24 - 22 20 19
Conductor Size mm2 0.126 0.196 0.283 0.312 0.5 0.636
Maximum Average Conductor Resistance @20°C Ω/km 143 91 63 58 34.6 28
Minimum Insulation Resistance @500V DC MΩ.km 5000 5000 5000 5000 5000 5000
Maximum Average Mutual Capacitance @800Hz nF/km 53 53 56 56 59 59
Maximum Individual Mutual Capacitance @800Hz
(for 99% cases)
nF/km 60 60 60 60 64 64
Maximum Individual Capacitance Unbalance
@800Hz pair-to-pair
pF/500m 250 250 250 250 160 160
Maximum Individual Capacitance Unbalance
@800Hz pair-to-pair ( for 95% cases)
pF/500m 150 150 150 150 100 100
Maximum Individual Capacitance Unbalance
@800Hz pair-to-ground
pF/500m 1700 1700 1700 1700 1700 1700
Maximum Individual Capacitance Unbalance
@800Hz pair-to-ground ( for 95% cases)
pF/500m 1000 1000 1000 1000 1000 1000
Maximum Conductor Loop Resistance @20°C Ω/km 300 192 130 114 73 60
Impedance @1KHz 994 796 665 660 500 445
Impedance @100KHz 147 134 127 125 124 122
Impedance @512KHz 120 118 117.5 117 116.5 116
Impedance @1MHz 117 115 114.5 114 113.5 113
Maximum Average Attenuation @0.8KHz dB/km 1.64 1.30 1.1 1.04 0.9 0.74
Maximum Average Attenuation @1KHz dB/km 1.68 1.35 1.14 1.08 0.93 0.76
Maximum Average Attenuation @3KHz dB/km 3.18 2.52 2.3 2.01 1.74 1.42
Maximum Average Attenuation @150KHz dB/km 11.4 8.3 7.2 6.2 5.7 4.4
Maximum Average Attenuation @772KHz dB/km 24.3 19.4 17.4 15.4 13.1 10.8
Maximum Average Attenuation @1000KHz dB/km 27.1 21.4 18.5 17.5 13.7 12.8
Dielectric Strength
Conductor to Conductor (1min) V DC 500 500 500 500 500 500
Conductor to Screen (1min) V DC 1000 1000 1000 1000 1000 1000
Nominal Insulation Thickness mm 0.175 0.20 0.25 0.26 0.3 0.3
Nominal Insulated Conductor Diameter mm 0.75 0.90 1.1 1.15 1.4 1.5

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

Foam Skin Insulated and LAP Sheathed Jelly Filled 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
TP708-02YSF(L)2Y-10P04 10 1.5 9.0 82
TP708-02YSF(L)2Y-20P04 20 1.5 10.0 120
TP708-02YSF(L)2Y-30P04 30 1.5 11.0 161
TP708-02YSF(L)2Y-50P04 50 1.5 14.0 239
TP708-02YSF(L)2Y-70P04 70 1.5 15.0 315
TP708-02YSF(L)2Y-100P04 100 1.5 18.0 434
TP708-02YSF(L)2Y-150P04 150 1.5 21.0 630
TP708-02YSF(L)2Y-200P04 200 1.8 24.0 824
TP708-02YSF(L)2Y-300P04 300 1.8 29.0 1195
TP708-02YSF(L)2Y-400P04 400 1.8 32.0 1556
TP708-02YSF(L)2Y-500P04 500 2.0 36.0 1921
TP708-02YSF(L)2Y-600P04 600 2.0 39.0 2282
TP708-02YSF(L)2Y-800P04 800 2.5 44.0 2987
TP708-02YSF(L)2Y-900P04 900 2.5 46.0 3364
TP708-02YSF(L)2Y-1000P04 1000 2.5 49.0 3712
TP708-02YSF(L)2Y-1200P04 1200 2.8 53.0 4411
TP708-02YSF(L)2Y-1500P04 1500 2.8 59.0 5483
TP708-02YSF(L)2Y-1800P04 1800 3.2 64.0 6567
TP708-02YSF(L)2Y-2100P04 2100 3.2 69.0 7626
TP708-02YSF(L)2Y-2400P04 2400 3.5 73.0 8663
TP708-02YSF(L)2Y-2700P04 2700 3.5 77.0 9697
TP708-02YSF(L)2Y-3000P04 3000 3.5 81.0 10729

1 2 3