IEC 60708 Standard Underground 600 pair telephone cable Outdoor/Indoor Wire x0.4/0.5/0.6/0.8mm 10/20/50/100/150200 Pairs **L**
Standards IEC 60708
Construction
Conductors: Solid annealed bare copper, 0.4/0.5/0.6/0.8mm
Insulation: Solid polyethylene as per IEC 60708/BS EN 50290-2-23/BS6234/ASTM D 1248
Twinning: Insulated conductors are twisted into pairs with varying lay length to minimize crosstalk.
Cabling Element: Pairs or Quads.
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.
Core Wrapping: One or more non-hygroscopic polyester tapes are helically or longitudinally laid with an overlap.
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.
Sheath: Black low density polyethylene
Ripcord: Ripcord may be provided for slitting the sheath longitudinally to facilitate its removal.
Spare Pairs (optional): Spare pairs may be incorporated in large pair cables.
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 0.15mm thick, being coated with a PE copolymer and applied with an overlap.
An outer polyethylene sheath is applied over the armour.
Self-Support Cables: 7-strand galvanized steel support wire.
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 | ohm/km | 143 | 91 | 63 | 34.6 |
Minimum Insulation Resistance @500V DC | Mohm.km | 5000 | 5000 | 5000 | 5000 |
Maximum Average Mutual Capacitance @800Hz | nF/km | 53 | 53 | 56 | 59 |
Maximum Individual Mutual Capacitance | nF/km | 60 | 60 | 60 | 64 |
@800Hz (for 99% cases) | |||||
Maximum Individual Capacitance Unbalance | pF/500m | 250 | 250 | 250 | 160 |
@800Hz pair-to-pair | |||||
Maximum Individual Capacitance Unbalance | pF/500m | 150 | 150 | 150 | 100 |
@800Hz pair-to-pair (for 95% cases) | |||||
Maximum Individual Capacitance Unbalance | pF/500m | 1700 | 1700 | 1700 | 1700 |
@800Hz pair-to-ground | |||||
Maximum Individual Capacitance Unbalance | pF/500m | 1000 | 1000 | 1000 | 1000 |
@800Hz pair-to-ground (for 95% cases) | |||||
Maximum Conductor Loop Resistance @20°C | ohm/km | 300 | 192 | 130 | 73 |
Impedance @1KHz | ohm | 994 | 796 | 665 | 500 |
Impedance @100KHz | ohm | 147 | 134 | 127 | 124 |
Impedance @512KHz | ohm | 120 | 118 | 117.5 | 116.5 |
Impedance @1MHz | ohm | 117 | 115 | 114.5 | 113.5 |
Maximum Average Attenuation @0.8KHz | dB/km | 1.64 | 1.3 | 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 | 0.2 | 0.25 | 0.3 |
Nominal Insulated Conductor Diameter | mm | 0.75 | 0.9 | 1.1 | 1.4 |
Solid PE Insulated & LAP Sheathed Air Core Cable to IEC 60708
Number of Pairs | Nominal Sheath Thickness | Nominal Overall Diameter | Nominal Weight |
mm | mm | kg/km | |
0.4mm Conductor, 0.75mm Insulated Wire | |||
10 | 1.5 | 9 | 71 |
20 | 1.5 | 10 | 107 |
30 | 1.5 | 11 | 143 |
50 | 1.5 | 13 | 211 |
70 | 1.5 | 15 | 278 |
100 | 1.5 | 17 | 380 |
150 | 1.5 | 21 | 548 |
200 | 1.8 | 23 | 708 |
300 | 1.8 | 28 | 1034 |
400 | 1.8 | 31 | 1358 |
500 | 2 | 35 | 1703 |
600 | 2 | 38 | 2016 |
800 | 2.5 | 43 | 2639 |
900 | 2.5 | 46 | 2961 |
1000 | 2.5 | 48 | 3264 |
1200 | 2.8 | 52 | 3873 |
1500 | 2.8 | 58 | 4819 |
1800 | 3.2 | 63 | 5777 |
2100 | 3.2 | 68 | 6731 |
2400 | 3.5 | 72 | 7645 |
2700 | 3.5 | 76 | 8556 |
3000 | 3.5 | 80 | 9466 |
0.5mm Conductor, 0.9mm Insulated Wire | |||
10 | 1.5 | 10 | 94 |
20 | 1.5 | 11 | 147 |
30 | 1.5 | 13 | 201 |
50 | 1.5 | 16 | 305 |
70 | 1.5 | 18 | 406 |
100 | 1.5 | 21 | 561 |
150 | 1.8 | 25 | 829 |
200 | 1.8 | 28 | 1074 |
300 | 2 | 34 | 1582 |
400 | 2 | 39 | 2093 |
500 | 2.5 | 43 | 2577 |
600 | 2.5 | 47 | 3073 |
800 | 2.8 | 53 | 4033 |
900 | 2.8 | 57 | 4541 |
1000 | 2.8 | 60 | 5015 |
1200 | 3.2 | 65 | 5959 |
1500 | 3.5 | 72 | 7414 |
0.6mm Conductor, 1.1mm Insulated Wire | |||
10 | 1.5 | 11 | 119 |
20 | 1.5 | 13 | 194 |
30 | 1.5 | 15 | 269 |
50 | 1.5 | 18 | 416 |
70 | 1.5 | 21 | 558 |
100 | 1.8 | 25 | 782 |
150 | 1.8 | 29 | 1143 |
200 | 2 | 33 | 1505 |
300 | 2 | 40 | 2238 |
400 | 2.5 | 46 | 2944 |
500 | 2.5 | 51 | 3633 |
600 | 2.8 | 55 | 4353 |
800 | 3.2 | 63 | 5722 |
900 | 3.2 | 67 | 6438 |
1000 | 3.2 | 70 | 7115 |
1200 | 3.5 | 76 | 8462 |
0.8mm Conductor, 1.4mm Insulated Wire | |||
10 | 1.5 | 13 | 178 |
20 | 1.5 | 16 | 305 |
30 | 1.5 | 19 | 431 |
50 | 1.5 | 23 | 678 |
70 | 1.8 | 27 | 929 |
100 | 1.8 | 31 | 1313 |
150 | 2 | 38 | 1963 |
200 | 2.5 | 43 | 2574 |
300 | 2.8 | 52 | 3790 |
400 | 2.8 | 60 | 5019 |
500 | 3.2 | 67 | 6249 |
600 | 3.5 | 73 | 7437 |
Solid PE Insulated, Double Steel Tape Armoured & LAP Sheathed Air Core Cable to IEC 60708
Number of Pairs | Nominal Sheath | Nominal Outer Sheath | Nominal Overall | Nominal Weight |
Thickness | Thickness | Diameter | kg/km | |
mm | mm | mm | ||
0.4mm Conductor, 0.75mm Insulated Wire | ||||
10 | 1.5 | 1.5 | 12 | 177 |
20 | 1.5 | 1.5 | 14 | 227 |
30 | 1.5 | 1.5 | 15 | 277 |
50 | 1.5 | 1.5 | 18 | 380 |
70 | 1.5 | 1.5 | 19 | 467 |
100 | 1.5 | 1.5 | 22 | 594 |
150 | 1.5 | 1.8 | 25 | 805 |
200 | 1.8 | 1.8 | 27 | 995 |
300 | 1.8 | 1.8 | 32 | 1382 |
400 | 1.8 | 1.8 | 37 | 1809 |
500 | 2 | 2 | 43 | 2704 |
600 | 2 | 2 | 46 | 3092 |
800 | 2.5 | 2.5 | 51 | 3846 |
900 | 2.5 | 2.5 | 54 | 4250 |
1000 | 2.5 | 2.5 | 56 | 4612 |
1200 | 2.8 | 2.8 | 61 | 5369 |
0.5mm Conductor, 0.9mm Insulated Wire | ||||
10 | 1.5 | 1.5 | 13 | 213 |
20 | 1.5 | 1.5 | 15 | 283 |
30 | 1.5 | 1.5 | 17 | 356 |
50 | 1.5 | 1.5 | 20 | 503 |
70 | 1.5 | 1.5 | 22 | 629 |
100 | 1.5 | 1.8 | 25 | 822 |
150 | 1.8 | 1.8 | 30 | 1145 |
200 | 1.8 | 1.8 | 33 | 1428 |
300 | 2 | 2 | 42 | 2542 |
400 | 2 | 2.5 | 47 | 3191 |
500 | 2.5 | 2.5 | 51 | 3778 |
600 | 2.5 | 2.8 | 55 | 4392 |
800 | 2.8 | 3.2 | 62 | 5563 |
900 | 2.8 | 3.2 | 65 | 6135 |
1000 | 2.8 | 3.5 | 68 | 6682 |
0.6mm Conductor, 1.1mm Insulated Wire | ||||
10 | 1.5 | 1.5 | 15 | 250 |
20 | 1.5 | 1.5 | 17 | 347 |
30 | 1.5 | 1.5 | 19 | 456 |
50 | 1.5 | 1.5 | 22 | 639 |
70 | 1.5 | 1.8 | 25 | 818 |
100 | 1.8 | 1.8 | 29 | 1093 |
150 | 1.8 | 2 | 34 | 1504 |
200 | 2 | 2 | 41 | 2457 |
300 | 2 | 2.5 | 48 | 3367 |
400 | 2.5 | 2.8 | 54 | 4238 |
500 | 2.5 | 2.8 | 59 | 5091 |
600 | 2.8 | 3.2 | 64 | 5913 |
800 | 3.2 | 3.5 | 72 | 7536 |
0.8mm Conductor, 1.4mm Insulated Wire | ||||
10 | 1.5 | 1.5 | 17 | 332 |
20 | 1.5 | 1.5 | 20 | 503 |
30 | 1.5 | 1.5 | 23 | 660 |
50 | 1.5 | 1.8 | 27 | 963 |
70 | 1.8 | 1.8 | 31 | 1267 |
100 | 1.8 | 2 | 37 | 1766 |
150 | 2 | 2.5 | 46 | 3038 |
200 | 2.5 | 2.5 | 51 | 3786 |
300 | 2.8 | 2.8 | 61 | 5290 |
400 | 2.8 | 3.2 | 68 | 6701 |
500 | 3.2 | 3.5 | 75 | 8108 |