Single Core Medium Power Cable to BS 6622

Single Core Cables to BS 6622BS 7835

Application:

The single core cables are designed for distribution of electrical power with nominal voltage Uo/U ranging from 3.8/6.6KV to 19/33KV and frequency 50Hz. They are suitable for installation mostly in power supply stations, indoors and in cable ducts, outdoors, underground and in water as well as for installation on cable trays for industries, switchboards and power stations.
Standards: BS 6622 BS 7835 (LSZH)
Conductor: Plain annealed copper or aluminium complying with IEC 60228/BS 6360. Copper conductors shall be stranded (class 2) and aluminium conductors shall be either solid or stranded (class 2).
Conductor Screen: Extruded layer of semi-conducting cross-linkable compound is applied over the conductor and shall cover the surface completely. The minimum thickness is 0.3mm and the maximum resistivity shall not exceed 500 Ohm-m at 90°C.
Insulation: Insulation is of cross-linked polyethylene compound XLPE (GP8) conforming to BS 7655-1.3 or EPR (GP7), conforming to BS 7655-1.2.

Table 1. Insulation Thickness

Nom. Cross Section Area  Insulation Thickness at Nominal Voltage    
3.8/6.6KV (Um=7.2KV) 6.35/11KV (Um=12KV) 8.7/15KV(Um=17.5KV) 12.7/22KV(Um=24KV) 19/33KV(Um=36KV)
mm² mm mm mm mm mm
70 - 185 2.5 3.4 4.5 5.5 8.0
240 2.6 3.4 4.5 5.5 8.0
300 2.8 3.4 4.5 5.5 8.0
400 3.0 3.4 4.5 5.5 8.0
Above 500 3.2 3.4 4.5 5.5 8.0

Insulaton Screen

Extruded layer of semi-conducting cross-linkable compound is applied over the insulation. The extruded semi-conducting layer shall consist of bonded or cold strippable semi-conducting compound capable of removal for jointing or terminating. As an option, a semi- conducting tape may be applied over the extruded semi-conducting layer as a bedding for the metallic layer. The minimum thickness is 0.3 mm and the maximum resistivity is 500 Ohm-m at 90°C. The screen is tightly fitted to the insulation to exclude all air voids and can be easily hand stripped on site.

Metallic Layer

The metallic layer shall consist of either copper tapes or a concentric layer of copper wires or a combination of tapes and wires. The metallic layer provides an earth fault current path, capable of withstanding fault current to earth of 1000A for one second at maximum temperature 160°C. Copper wires are applied over the conducting water blocking layer with a minimum diameter of 0.5mm. And over the copper wires, copper tape with minimum thickness of 0.1mm can be applied helically with overlap. Total cross section of copper wire screen layer is shown in table 2.

Table 2. Minimum Total Cross Section of Copper Wire Screen & DC Resistance of the screen

Nominal Cross-Section of Cables Minimum Cross-Section of Copper Wire Screen DC Resistance of the Copper Wire Screen at 20°C
mm² mm² Ω
up to 120 16 1.06
150-300 25 0.72
400-630 35 0.51

Separation Sheath (for armoured cable)

The separation sheath comprises a layer of extruded PVC, PE or LSZH. The nominal thickness is calculated by 0.02Du + 0.6mm where Du is the fictitious diameter under the sheath in mm. The nominal separation sheath thickness shall not be less than 1.2mm.

Armour (for armoured cable)

The armour consists of round aluminium wire with diameter specified as in Table 3.

Table 3. Armour Wire Diameter

Fictitious Diameter Under the Armour  Armour Wire Diameter
mm mm
> <  
  25 1.6
25 35 2
35 60 2.5
60 - 3.15

Over Sheath

Overall sheath comprises a layer of extruded either PVC type 9 conforming to BS 7665-4.2 or MDPE type TS2 conforming to BS 7655-10.1. LSZH can be offered as an option. The oversheath is normally black in colour. When a DC voltage test is to be performed on the oversheath, a semi-conducting layer such as graphite coating shall be applied over the surface of the extruded oversheath. The nominal oversheath thickness is calculated by 0.035+D where D is the diameter immediately under the oversheath in mm. For cables with the oversheath not applied over the armour, the nominal oversheath thickness shall not be less than 1.4mm. And for cables with oversheath applied over the armour, the nominal oversheath thickness shall not be less than 1.8mm.

Physical Properties

Operating Temperature: up to 90°C

Temperature Range: -5°C ( PVC sheath ); -20°C ( PE sheath )

Short Circuit Temperature: 250°C (short circuit duration up to 5 seconds)

Bending Radius: 12 x OD

Table 4. Nominal /Operating /Test Voltages

Rated Voltage Uo/U Operating Voltage (Um) Testing Voltage (rms)
3.8/6.6KV 7.2KV 15KV
6.35/11KV 12KV 25.5KV
8.7/15KV 17.5KV 35KV
12.7/22KV 24KV 51KV
19/33KV 36KV 76KV

Single Core 3.8/6.6KV (Um=7.2KV) Dimensional Data

Nom. Cross-Section Area     Unarmoured  Cables     Aluminium Wire Armoured Cables      
Nom. Insulation Thickness  Copper Wire Screen Area  Nom. Sheath Thickness  Approx. Overall Diameter  Approx. Weight  Copper Tape Screen Area  Nom. Bedding Thickness  Nom. Armour Wire Diameter  Nom. Sheath Thickness  Approx. Overall Diameter  Approx. Weight 
Cu  AL Cu AL
mm2 mm mm2 mm mm kg/km  mm2 mm mm mm mm kg/km 
25 2.5 16 1.5 20.3 750 580 3.4 1.2 1.6 1.8 26.3 1150 1000
35 2.5 16 1.6 21.3 870 650 3.6 1.2 1.6 1.8 27.3 1250 1050
50 2.5 16 1.6 22.4 1090 770 3.9 1.2 1.6 1.8 28.4 1500 1190
70 2.5 16 1.7 24.2 1310 870 4.3 1.2 1.6 1.8 30.0 1740 1300
95 2.5 16 1.7 25.8 1560 960 4.7 1.2 1.6 1.9 31.8 2030 1430
120 2.5 16 1.8 27.4 1830 1070 5.0 1.2 1.6 1.9 33.2 2310 1550
150 2.5 25 1.8 29.1 2130 1190 5.3 1.2 1.6 2.0 35.1 2660 1720
185 2.5 25 1.9 30.8 2490 1320 5.8 1.2 2.0 2.0 37.4 3120 1950
240 2.6 25 1.9 33.5 3040 1520 6.3 1.2 2.0 2.1 40.3 3740 2200
300 2.8 25 2.0 36.1 3650 1770 7.0 1.2 2.0 2.2 42.9 4400 2520
400 3.0 35 2.2 40.6 4680 2170 7.7 1.2 2.0 2.3 47.2 5490 2960
500 3.2 35 2.3 43.6 5670 2570 8.5 1.3 2.5 2.5 51.6 6760 3660
630 3.2 35 2.4 48.8 6980 2990 9.5 1.4 2.5 2.6 57.0 8200 4160

Electrical Data

Nom. Cross- Section Area          Unarmoured Cables Aluminium Wire Armoured Cables  
D C Resistance CU / AL   A C Resistance CU / AL   Short Circuit Rating of Conductor CU / AL 1 sec   Capaci- tance   Charging Current   Short Circuit Rating of Copper Wire Screen 1 sec   Short Circuit Rating of Copper Tape Screen 1 sec   Reactance  Inductance  Impedance   
Trefoil  Flat     spaced  Trefoil  Flat Spaced  Trefoil  Flat Spaced 
Cu AL Cu AL
mm2 µΩ/m µΩ/m kA pF/m mA/m kA kA µΩ/m µΩ/m nH/m nH/m µΩ/ m  µΩ/m 
25 727/1200 927/1538 3.6/2.3 263 0.32 2.6 0.4 136 194 400 590 936 1544 952 1554
35 524/868 668/1113 5.0/3.2 291 0.35 2.6 0.5 127 185 390 580 679 1121 695 1131
50 387/641 494/822 6.8/4.4 321 0.39 2.6 0.5 121 179 380 570 511 834 527 844
70 268/443 343/568 9.8/6.3 371 0.45 2.6 0.6 115 173 370 550 364 583 386 597
95 193/320 248/410 13.3/8.5 417 0.50 2.6 0.6 110 168 350 540 272 427 300 446
120 153/253 196/325 17.2/11.0 459 0.55 2.6 0.7 107 165 340 520 225 345 257 367
150 124/206 159/265 21.2/13.5 494 0.59 4.3 0.7 103 161 330 510 193 287 229 313
185 99.1/164 128/211 26.6/17.0 543 0.65 4.3 0.8 100 158 320 500 165 237 206 267
240 75.4/125 98/161 34.9/22.3 583 0.70 4.3 0.9 97 155 310 490 140 191 185 226
300 60.1/100 80/130 43.8/28.0 602 0.72 4.3 1.0 95 153 300 490 126 163 174 203
400 47.0/77.8 64/102 57.3/36.6 627 0.75 5.8 1.1 92 150 290 480 113 141 164 184
500 36.6/60.5 51/81 72.3/46.2 654 0.79 5.8 1.2 90 149 290 470 105 124 158 171
630 28.3/46.9 42/64 91.2/58.3 726 0.87 5.8 1.3 87 145 280 460 97 110 151 160

Single Core 6.35/11KV (Um=12KV) Dimensional Data

Nom. Cross- Section Area     Unarmoured Cables     Aluminium Wire Armoured Cables      
Nom. Insulation Thickness  Copper Wire Screen Area  Nom. Sheath Thickness  Approx. Overall Diameter  Approx. Weight  Copper Tape Screen Area  Nom. Bedding Thickness  Nom. Armour Wire Diameter  Nom. Sheath Thickness  Approx. Overall Diameter  Approx. Weight 
Cu AL Cu AL
mm2 mm mm2 mm mm kg/km  mm2 mm mm mm mm kg/km 
25 3.4 16 1.5 22.1 960 740 3.8 1.2 1.6 1.8 28.1 1300 780
35 3.4 16 1.6 23.3 1060 790 4.1 1.2 1.6 1.8 29.1 1400 1180
50 3.4 16 1.7 24.4 1160 840 4.4 1.2 1.6 1.8 30.2 1600 1280
70 3.4 16 1.7 26.0 1370 930 4.7 1.2 1.6 1.9 32.0 1840 1400
95 3.4 16 1.8 27.8 1640 1040 5.2 1.2 1.6 1.9 33.6 2130 1530
120 3.4 16 1.8 29.2 1900 1140 5.5 1.2 1.6 2.0 35.2 2430 1670
150 3.4 25 1.9 31.1 2220 1280 5.8 1.2 1.6 2.1 37.9 2870 1930
185 3.4 25 1.9 32.6 2570 1410 6.2 1.2 2.0 2.1 39.4 3240 2080
240 3.4 25 2.0 35.3 3130 1610 6.8 1.2 2.0 2.2 42.1 3490 2330
300 3.4 25 2.1 37.5 3730 1850 7.3 1.2 2.0 2.2 44.1 4490 2560
400 3.4 35 2.2 41.4 4730 2200 8.0 1.2 2.0 2.4 48.2 5589 3040
500 3.4 35 2.3 44.0 5700 2600 8.6 1.3 2.5 2.5 52.0 6780 3680
630 3.4 35 2.4 49.2 7010 3020 9.5 1.4 2.5 2.6 57.4 8230 4200

Electrical Data

Nom. Cross- Section Area       Unarmoured Cables Aluminium Wire  Armoured Cables         
D C Resistance CU / AL A C Resistance CU / AL Short Circuit Rating of Conductor CU / AL  1 sec Capaci- tance Charging Current Short Circuit Rating of Copper  Wire Screen 1 sec Short Circuit Rating of Copper Tape Screen 1 sec Reactance Inductance Impedance
Trefoil Flat Spaced Trefoil Flat Spaced Trefoil Flat Spaced
Cu AL Cu AL
mm2 µΩ/m µΩ/m kA pF/m mA/m kA kA µΩ/m µΩ/m nH/m nH/m µΩ/m µΩ/m
25 727/1200 927/1538 3.6/2.3 208 0.42 2.6 0.5 146 206 440 640 936 1544 952 1554
35 524/868 668/1113 5.0/3.2 229 0.46 2.6 0.6 138 201 440 640 679 1121 695 1131
50 387/641 494/822 6.8/4.4 252 0.5 2.6 0.6 132 195 420 620 511 834 527 844
70 268/443 343/568 9.8/6.3 288 0.58 2.6 0.7 122 188 390 600 364 583 386 597
95 193/320 248/410 13.3/8.5 323 0.65 2.6 0.7 122 182 390 580 272 427 300 446
120 153/253 196//325 17.2/11.0 353 0.71 2.6 0.8 116 172 370 550 225 345 257 367
150 124/206 159/265 21.2/13.5 380 0.76 4.3 0.8 110 166 350 530 193 287 229 313
185 99.1/164 128/211 26.6/17.0 416 0.83 4.3 0.9 107 166 340 530 165 237 206 267
240 75.4/125 98/161 34.9/22.3 460 0.92 4.3 0.9 104 163 330 520 140 191 185 226
300 60.1/100 80/130 43.8/28.0 506 1.01 4.3 1 100 157 320 500 126 163 174 203
400 47/77.8 64/102 57.3/36.6 561 1.12 5.8 1.1 94 154 300 490 113 141 164 184
500 36.6/60.5 51/81 72.3/46.2 619 1.24 5.8 1.2 91 151 290 480 105 124 158 171
630 28.3/46.9 42/64 91.2/58.3 698 1.37 5.8 1.3 91 148 290 470 97 110 151 160

Single Core 8.7/15KV (Um=17.5kV) Dimensional Data

Nom. Cross- Section Area     Unarmoured Cables     Aluminium Wire Armoured Cables      
Nom. Insulation Thickness  Copper Wire Screen Area  Nom.Sheath Thickness  Approx. Overall Diameter  Approx. Weight  Copper Tape Screen Area  Nom.Bedding Thickness  Nom. Armour Wire Diameter  Nom. Sheath Thickness  Approx. Overall Diameter  Approx. Weight 
CU AL CU AL
mm2 mm mm2 mm mm kg/km  mm2 mm mm mm mm kg/km 
25 4.5 16 1.6 23.7 940 820 4.4 1.2 1.6 1.8 30.3 1430 1210
35 4.5 16 1.7 24.9 1140 870 4.7 1.2 1.6 1.9 31.5 1630 1310
50 4.5 16 1.7 26.6 1240 920 4.9 1.2 1.6 1.9 32.6 1730 1410
70 4.5 16 1.8 28.4 1470 1030 5.3 1.2 1.6 1.9 34.2 1970 1520
95 4.5 16 1.9 30.2 1750 1160 5.7 1.2 2.0 2.0 36.8 2370 1770
120 4.5 16 1.9 31.6 2100 1250 6.1 1.2 2.0 2.1 38.4 2670 1910
150 4.5 25 2.0 33.5 2340 1400 6.4 1.2 2.0 2.1 40.1 3020 2080
185 4.5 25 2.0 35.0 2690 1520 6.8 1.2 2.0 2.2 41.8 3420 2240
240 4.5 25 2.1 36.8 3270 1740 7.4 1.2 2.0 2.3 44.5 4050 2500
300 4.5 25 2.2 39.9 3870 1990 7.9 1.2 2.0 2.3 46.5 4680 2780
400 4.5 35 2.3 43.8 4890 2370 8.5 1.3 2.5 2.5 51.8 5970 3430
500 4.5 35 2.4 46.4 5860 2760 9.2 1.3 2.5 2.6 54.4 7010 3910
630 4.5 35 2.5 51.6 7190 3190 10.0 1.4 2.5 2.7 59.8 8480 4420

Electrical Data

Nom. Cross- Section Area          Unarmoured Cables Aluminium Wire Armoured Cables         
D C Resistance CU / AL   A C Resistance CU / AL   Short  Circuit Rating of Conductor CU / AL 1 sec   Capac-itance   Charging Current   Short  Circuit  Rating of Copper Wire Screen 1 sec   Short Circuit Rating of Copper Tape Screen 1 sec   Reactance  Inductance   Impedance   
Trefoil  Flat Spaced  Trefoil  Flat Spaced  Trefoil  Flat Spaced 
CU AL CU AL
mm2 µΩ/m µΩ/m kA pF/m mA/m kA kA µΩ/m µΩ/m nH/m nH/m µΩ/m  µΩ/m 
25 727/1200 927/1538 3.6/2.3 171 0.47 2.6 0.6 154 217 480 680 936 1544 952 1554
35 524/868 668/1113 5.0/3.2 187 0.51 2.6 0.6 145 208 460 660 679 1121 695 1131
50 387/641 494/822 6.8/4.4 204 0.56 2.6 0.7 138 201 440 640 511 834 527 844
70 268/443 343/568 9.8/6.3 232 0.63 2.6 0.7 132 188 420 600 364 583 386 597
95 193/320 248/410 13.3/8.5 258 0.70 2.6 0.8 126 182 400 580 272 427 300 446
120 153/253 196/325 17.2/11.0 281 0.77 2.6 0.8 119 179 380 570 225 345 257 367
150 124/206 159/265 21.2/13.5 301 0.82 4.3 0.9 113 176 360 560 193 287 229 313
185 99.1/164 128/211 26.6/17.0 329 0.90 4.3 0.9 110 170 350 540 165 237 206 267
240 75.4/125 98/161 34.9/22.3 363 0.99 4.3 1.0 107 166 340 530 140 191 185 226
300 60.1/100 80/130 43.8/28.0 398 1.09 4.3 1.1 104 160 330 510 126 163 174 203
400 47/77.8 64/102 57.3/36.6 439 1.20 5.8 1.2 97 157 310 500 113 141 164 184
500 36.6/60.5 51/81 72.3/46.2 483 1.32 5.8 1.3 94 154 300 490 105 124 158 171
630 28.3/46.9 42/64 91.2/58.3 534 1.46 5.8 1.4 91 151 290 480 97 110 151 160

Single Core 12.7/22KV (Um=24kV) Dimensional Data

Nom. Cross- Section Area      Unarmoured Cables     Aluminium Wire Armoured Cables      
Nom. Insulation Thickness   Copper Wire Screen Area   Nom.Sheath Thickness   Approx. Overall Diameter   Approx. Weight  Copper Tape Screen Area Nom. Bedding Thickness Nom. Armour Wire Diameter Nom. Sheath Thickness Approx. Overall Diameter Approx. Weight 
CU AL CU AL
mm2 mm mm2 mm mm kg/km  mm2 mm mm mm mm kg/km 
35 5.5 16 1.7 27.4 1100 800 5.2 1.2 1.6 1.9 31.4 1400 1200
50 5.5 16 1.8 28.8 1330 1010 5.4 1.2 1.6 2 34.8 1850 1540
70 5.5 16 1.9 30.6 1570 1130 5.9 1.2 2 2 37.2 2190 1750
95 5.5 16 1.9 32.2 1840 1240 6.2 1.2 2 2.1 39 2510 1900
120 5.5 16 2 33.8 2120 1360 6.6 1.2 2 2.1 40.4 2810 2040
150 5.5 25 2 35.5 2440 1500 6.9 1.2 2 2.2 42.3 3180 2240
185 5.5 25 2.1 37.2 2810 1640 7.4 1.2 2 2.2 43.8 3560 2380
240 5.5 25 2.2 39.9 3390 1860 7.8 1.2 2 2.3 46.5 4200 2640
300 5.5 25 2.2 41.9 3990 2110 8.4 1.3 2.5 2.4 49.9 5030 3130
400 5.5 35 2.3 45.8 5100 2490 9 1.3 2.5 2.5 53.8 6140 3600
500 5.5 35 2.4 48.4 6000 2900 9.7 1.4 2.5 2.6 56.6 7210 4100
630 5.5 35 2.5 53.6 7340 3340 10.4 1.4 2.5 2.8 62 8700 4650

Electrical Data

Nom. Cross- Section Area       Unarmoured Cables Aluminium Wire Armoured Cables         
D C Resistance CU / AL A C Resistance CU / AL Short  Circuit Rating of Conductor CU / AL 1 sec Capaci- tance Charging Current Short  Circuit  Rating of Copper Wire Screen 1 sec Short Circuit Rating of Copper Tape Screen 1 sec Reactance Inductance Impedance
Trefoil Flat Spaced Trefoil Flat Spaced Trefoil Flat Spaced
CU AL CU AL
mm2 µΩ/m µΩ/m kA pF/m mA/m kA kA µΩ/m µΩ/m nH/m nH/m µΩ/m µΩ/m
35 524/868 668/1113 5.0/3.2 162 0.7 2.6 0.7 147 207 470 620 679 1121 695 1131
50 387/641 494/822 6.8/4.4 177 0.8 2.6 0.8 141 201 450 640 511 834 527 844
70 268/443 343/568 9.8/6.3 200 0.8 2.6 0.8 135 195 430 620 364 583 386 597
95 193/320 248/410 13.3/8.5 222 0.9 2.6 0.9 129 188 410 600 272 427 300 446
120 153/253 196/325 17.2/11.0 241 0.9 2.6 0.9 122 182 390 580 225 345 257 367
150 124/206 159/265 21.2/13.5 257 1.0 4.3 1.0 116 176 370 560 193 287 229 313
185 99.1/164 128/211 26.6/17.0 280 1.0 4.3 1.0 116 173 370 550 165 237 206 267
240 75.4/125 98/161 34.9/22.3 307 1.1 4.3 1.1 110 170 350 540 140 191 185 226
300 60.1/100 80/130 43.8/28.0 336 1.2 4.3 1.2 107 166 340 530 126 163 174 203
400 470/77.8 64/102 57.3/36.6 370 1.3 5.8 1.3 100 160 320 510 113 141 164 184
500 36.6/60.5 51/81 72.3/46.2 406 1.4 5.8 1.4 97 154 310 490 105 124 158 171
630 28.3/46.9 42/64 91.2/58.3 449 1.5 5.8 1.5 94 151 300 480 97 110 151 160

Single Core 19/33KV (Um=36kV) Dimensional Data

Nom. Cross- Section Area   Unarmoured Cables Aluminium Wire Armoured Cables
Nom.Insulation Thickness Copper Wire Screen Area Nom.Sheath Thickness Approx. Overall Diameter Approx. Weight Copper Tape Screen Area Nom.Bedding Thickness Nom. Armour Wire Diameter Nom. Sheath Thickness Approx. Overall Diameter Approx. Weight
CU AL CU AL
mm2 mm mm2 mm mm kg/km mm2 mm mm mm mm kg/km
50 8 16 2.0 34.2 1580 1270 6.7 1.2 2.0 2.2 41.0 2300 1980
70 8 16 2.0 35.8 1820 1380 7.1 1.2 2.0 2.2 42.6 2560 2120
95 8 16 2.1 37.6 2120 1510 7.5 1.2 2.0 2.3 44.4 2890 2290
120 8 16 2.1 39.0 2400 1630 7.9 1.2 2.0 2.3 45.8 3200 2430
150 8 25 2.2 40.9 2740 1810 8.2 1.3 2.5 2.4 48.9 3760 2830
185 8 25 2.2 42.4 3110 1950 8.6 1.3 2.5 2.5 50.6 4180 3010
240 8 25 2.3 45.1 3720 2180 9.2 1.3 2.5 2.5 53.1 4830 3270
300 8 25 2.4 47.3 4350 2460 9.7 1.4 2.5 2.6 55.5 5540 3630
400 8 35 2.5 51.2 5410 2880 10.3 1.4 2.5 2.7 59.4 6680 4130
500 8 35 2.6 53.8 6420 3320 11.0 1.5 2.5 2.8 62.2 7790 4690
630 8 35 2.7 59.0 7800 3780 11.8 1.5 2.5 2.9 67.4 9290 5220

Electrical Data

Nom. Cross- Section Area       Unarmoured Cables Aluminium Wire Armoured Cables         
D C Resistance CU / AL A C Resistance CU / AL Short  Circuit  Rating of Conductor CU / AL 1 sec Capaci- tance Charging Current Short  Circuit Rating of Copper  Wire  Screen 1 sec Short Circuit Rating of Copper Tape Screen 1 sec Reactance Inductance Impedance
Trefoil Flat Spaced Trefoil  Flat Spaced  Trefoil Flat Spaced
CU AL CU AL
mm2 µΩ/m µΩ/m kA pF/m mA/m kA kA µΩ/m µΩ/m nH/m nH/m µΩ/m µΩ/m
50 387/641 494/822 6.8/4.4 138 0.83 2.6 1.0 151 214 480 680 511 834 527 844
70 268/443 343/568 9.8/6.3 154 0.92 2.6 1.0 144 201 460 640 364 583 386 597
95 193/320 248/410 13.3/8.5 169 1.01 2.6 1.1 138 195 440 620 272 427 300 446
120 153/253 196/325 17.2/11.0 183 1.10 2.6 1.1 132 188 420 600 225 345 257 367
150 124/206 159/265 21.2/13.5 194 1.16 4.3 1.2 126 182 400 580 193 287 229 313
185 99.1/164 128/211 26.6/17.0 210 1.26 4.3 1.2 122 182 390 580 165 237 206 267
240 75.4/125 98/161 34.9/22.3 229 1.37 4.3 1.3 119 176 380 560 140 191 185 226
300 60.1/100 80/130 43.8/28.0 249 1.49 4.3 1.4 113 173 360 550 126 163 174 203
400 47/77.8 64/102 57.3/36.6 273 1.64 5.8 1.5 107 163 340 520 113 141 164 184
500 36.6/60.5 51/81 72.3/46.2 298 1.79 5.8 1.6 104 163 330 520 105 124 158 171
630 28.3/46.9 42/64 91.2/58.3 327 1.96 5.8 1.7 100 160 320 510 97 110 151 160

Current Rating for 3.8/6.6KV (Um=7.2KV), 6.35/11KV (Um=12KV) & 8.7/15KV (Um=17.5KV)

Nom. Cross- Section Area Ground Duct Air
Trefoil Unarm'd/Arm'd  Flat Spaced Unarm'd/Arm'd  Trefoil Unarm'd/Arm'd  Flat Touching Unarm'd/Arm'd  Trefoil Unarm'd/Arm'd  Flat Spaced Unarm'd/Arm'd 
CU AL CU AL CU AL CU AL CU AL CU AL
mm2 A A A A A A
25 160/160 120/120 170/170 125/125 165/165 125/125 165/165 125/125 170/170 130/130 230/235 180/180
35 180/180 150/150 190/190 155/15 185/185 155/155 185/185 155/155 200/200 160/160 260/265 210/210
50 220/220 170/170 230/230 175/175 225/220 175/170 220/220 170/170 235/250 180/195 295/300 230/230
70 270/270 210.21 280/280 215/215 270/260 215/210 270/270 210/210 285/310 225/240 370/370 290/290
95 320/320 250/250 335/335 260/260 320/305 255/245 325/325 250/250 360/375 280/295 455/460 350/355
120 360/360 280/280 380/380 295/295 360/340 285/275 370/370 285/285 415/430 320/355 520/530 410/410
150 410/410 320/315 430/430 330/330 400/375 315/300 415/410 320/320 470/490 365/380 600/600 465/465
185 460/455 360/355 485/485 375/375 440/410 350/335 465/460 360/360 540/550 425/435 690/690 530/530
240 530/520 415/405 560/560 440/440 505/460 405/380 540/540 420/420 640/650 500/510 820/820 640/630
300 600/580 475/455 640/640 495/495 560/500 455/420 610/610 475/470 740/740 580/580 940/940 730/730
400 680/650 540/510 730/730 570/570 610/530 510/455 690/690 540/540 840/840 670/670 1100/1100 860/860
500 750/710 610/570 830/830 650/650 680/570 570/500 790/780 620/620 940/930 790/770 1280/1280 1010/1010
630 830/760 680/640 940/940 750/750 750/620 640/550 890/890 710/700 1110/1040 910/880 1500/1480 1190/1180

Current Rating for 12.7/22KV (Um=24KV)

Nom. Cross- Section Area Ground Duct Air
Trefoil Unarm'd/Arm'd Flat Spaced Unarm'd/Arm'd Trefoil Unarm'd/Arm'd Flat Touching Unarm'd/Arm'd Trefoil Unarm'd/Arm'd Flat Spaced Unarm'd/Arm'd
CU AL CU AL CU AL CU AL CU AL CU AL
mm2 A A A A A A
35 180/180 130/130 200/200 135/135 180/170 130/125 180/175 130/125 190/175 145/135 225/230 175/175
50 220/220 170/170 230/230 175/175 225/210 175/170 225/220 175/170 245/260 190/200 295/300 230/230
70 270/270 210.21 280/280 215/215 270/260 210/205 270/270 210/210 300/320 235/245 365/370 285/285
95 320/320 250/245 335/335 260/260 320/300 250/245 320/325 250/250 360/380 280/295 450/450 345/350
120 360/360 280/280 380/380 295/295 360/340 280/275 365/365 285/285 425/440 330/340 520/520 400/400
150 410/410 320/310 430/430 330/330 405/370 320/300 410/410 320/315 485/490 375/385 590/590 455/455
185 460/450 360/350 485/485 375/375 445/400 350/335 460/460 360/360 550/560 430/440 670/670 520/520
240 530/510 415/405 560/560 440/440 520/450 415/380 530/530 415/415 650/650 510/510 800/800 620/620
300 600/570 475/450 640/640 495/495 570/490 460/415 600/600 470/470 740/730 580/580 920/910 710/710
400 690/640 550/510 730/730 570/570 630/530 520/460 690/680 540/530 850/830 680/670 1070/1060 840/830
500 760/700 610/570 830/830 650/650 700/570 570/510 780/770 610/610 980/940 790/770 1250/1230 980/970
630 850/760 690/640 950/940 750/750 780/610 650/560 890/880 700/700 1130/1050 920/880 1450/1430 1060/1140

Current Rating for 19/33KV (Um=36KV)

Nom. Cross- Section Area Ground Duct Air
Trefoil Unarm'd/Arm'd Flat Spaced Unarm'd/Arm'd Trefoil Unarm'd/Arm'd Flat Touching Unarm'd/Arm'd Trefoil Unarm'd/Arm'd Flat Spaced Unarm'd/Arm'd
CU AL CU AL CU AL CU AL CU AL CU AL
mm2 A A A A A A
50 220/220 170/170 230/230 175/175 225/220 175/170 225/220 175/170 245/260 190/200 295/300 230/230
70 270/270 210.21 280/280 215/215 270/260 210/205 270/270 210/210 300/320 235/245 365/370 285/285
95 320/320 250/245 335/335 260/260 320/300 250/245 320/325 250/250 360/380 280/295 450/450 345/350
120 360/360 280/280 380/380 295/295 360/340 280/275 365/365 285/285 425/440 330/340 520/520 400/400
150 410/410 320/310 430/430 330/330 405/370 320/300 410/410 320/315 485/490 375/385 590/590 455/455
185 460/450 360/350 485/485 375/375 445/400 350/335 460/460 360/360 550/560 430/440 670/670 520/520
240 530/510 415/405 560/560 440/440 520/450 415/380 530/530 415/415 650/650 510/510 800/800 620/620
300 600/570 475/450 640/640 495/495 570/490 460/415 600/600 470/470 740/730 580/580 920/910 710/710
400 690/640 550/510 730/730 570/570 630/530 520/460 690/680 540/530 850/830 680/670 1070/1060 840/830
500 760/700 610/570 830/830 650/650 700/570 570/510 780/770 610/610 980/940 790/770 1250/1230 980/970
630 850/760 690/640 940/940 750/750 780/610 650/560 890/880 700/700 1130/1050 920/880 1450/1430 1060/1140

Current Rating Conditions:

Ground Temperature:20°C

Ambient Temperature (air): 30°C

Depth of Soil: 0.8m

Thermal Resistance of Soil: 1.5K•m/W

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