Single Core Cables to BS 6622/BS 7835

APPLICATIONS

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.

STANDARD

• BS 6622
• BS 7835 (LSZH Version)

CONSTRUCTION

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) MM^2 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. As an alternative, copper tape(s) with minimum thickness of 0.1mm can be applied with overlap. Total cross section of copper wire screen and copper tape screen layer are shown in Table 2a and 2b.

TABLE 2A. TOTAL CROSS SECTION AND MAX. DC RESISTANCE OF COPPER WIRE SCREEN

NOMINAL CROSS-
SECTION OF CABLES MM² TOTAL CROSS SECTION MAX. DC RESISTANCE OF COPPER WIRE SCREEN AT 20℃ 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 MM² Ω 70 16 16 16 16 16 1.19 95 16 16 16 16 16 1.19 120 16 16 16 16 16 1.19 150 25 25 25 25 25 0.759 185 25 25 25 25 25 0.759 240 25 25 25 25 25 0.759 300 25 25 25 25 25 0.759 400 35 35 35 35 35 0.271 500 35 35 35 35 35 0.217 630 35 35 35 35 35 0.271

TABLE 2B. TOTAL CROSS SECTION AND MAX. DC RESISTANCE OF COPPER TAPE SCREEN (0.1MM)

NOMINAL
CROSS-
SECTION
OF
CONDUCTOR TOTAL CROSS SECTION & MAX DC RESISTANCE 　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) TOTAL
CROSS
SECTION MAX. DC
RESISTANCE
AT 20℃ TOTAL
CROSS
SECTION MAX. DC
RESISTANCE
AT 20℃ TOTAL
CROSS
SECTION MAX. DC
RESISTANCE
AT 20℃ TOTAL
CROSS
SECTION MAX. DC
RESISTANCE
AT 20℃ TOTAL
CROSS
SECTION MAX. DC
RESISTANCE
AT 20℃ MM² MM² Ω MM² Ω MM² Ω MM² Ω MM² Ω 70 7.4 2.314 8.2 2.106 9.1 1.897 9.9 1.740 11.9 1.442 95 8.2 2.095 8.9 1.923 9.8 1.748 10.7 1.614 12.7 1.354 120 9.0 1.905 9.8 1.761 10.7 1.613 11.5 1.498 13.5 1.272 150 9.7 1.781 10.4 1.655 11.3 1.523 12.1 1.420 14.2 1.215 185 10.6 1.626 11.2 1.540 12.2 1.407 12.9 1.335 14.9 1.153 240 11.7 1.465 12.4 1.388 13.3 1.294 14.1 1.219 16.2 1.065 300 12.9 1.334 13.4 1.285 14.3 1.204 15.1 1.139 17.1 1.003 400 14.3 1.205 14.6 1.178 15.5 1.110 16.3 1.054 18.4 0.937 500 15.7 1.094 16.2 1.061 17.1 1.005 17.5 0.982 20.0 0.861 630 17.3 0.992 18.9 0.912 18.7 0.918 19.5 0.880 21.6 0.797 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.

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 over sheath is normally black in colour. When a DC voltage test is to be performed on the over sheath, a semi-conducting layer such as graphite coating shall be applied over the surface of the extruded over sheath. The nominal over sheath thickness is calculated by 0.035D+1.0 where D is the diameter immediately under the over sheath in mm. For cables with the over sheath not applied over the armour, the nominal over sheath thickness shall not be less than 1.4mm. And for cables with over sheath applied over the armour, the nominal over sheath thickness shall not be less than 1.8mm.

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 NOM. INSULATION THICKNESS COPPER WIRE SCREEN AREA COPPER TAPE SCREEN AREA NOM. BEDDING THICKNESS NOM.
ARMOUR WIRE DIAMETER NOM. SHEATH THICKNESS APPROX. OVERALL DIAMETER APPROX. WEIGHT CU AL MM² MM MM² MM² MM MM MM MM KG/KM 70 2.5 16 7.4 1.2 1.6 1.8 30.0 1740 1300 95 2.5 16 8.2 1.2 1.6 1.9 31.8 2030 1430 120 2.5 16 9.0 1.2 1.6 1.9 33.2 2310 1550 150 2.5 25 9.7 1.2 1.6 2.0 35.1 2660 1720 185 2.5 25 10.6 1.2 2.0 2.0 37.4 3120 1950 240 2.6 25 11.7 1.2 2.0 2.1 40.3 3740 2200 300 2.8 25 12.9 1.2 2.0 2.2 42.9 4400 2520 400 3.0 35 14.3 1.2 2.0 2.3 47.2 5490 2960 500 3.2 35 15.7 1.3 2.5 2.5 51.6 6760 3660 630 3.2 35 17.3 1.4 2.5 2.6 57.0 8200 4160 Electrical Data Nom. Cross- Section Area 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 Screen 1 sec Reactance Inductance Impedance Trefoil Flat spaced Trefoil Flat Spaced Trefoil Flat Spaced Copper Wire Copper Tape CU AL CU AL mm² µΩ/m µΩ/m kA pF/m mA/m kA µΩ/m µΩ/m nH/m nH/m µΩ/ m µΩ/m 70 268/443 343/568 9.8/6.3 371 0.45 1.96 1.09 115 173 370 550 364 583 386 597 95 193/320 248/410 13.3/8.5 417 0.50 1.96 1.20 110 168 350 540 272 427 300 446 120 153/253 196/325 17.2/11.0 459 0.55 1.96 1.32 107 165 340 520 225 345 257 367 150 124/206 159/265 21.2/13.5 494 0.59 3.06 1.41 103 161 330 510 193 287 229 313 185 99.1/164 128/211 26.6/17.0 543 0.65 3.06 1.54 100 158 320 500 165 237 206 267 240 75.4/125 98/161 34.9/22.3 583 0.70 3.06 1.71 97 155 310 490 140 191 185 226 300 60.1/100 80/130 43.8/28.0 602 0.72 3.06 1.88 95 153 300 490 126 163 174 203 400 47.0/77.8 64/102 57.3/36.6 627 0.75 4.29 2.08 92 150 290 480 113 141 164 184 500 36.6/60.5 51/81 72.3/46.2 654 0.79 4.29 2.30 90 149 290 470 105 124 158 171 630 28.3/46.9 42/64 91.2/58.3 726 0.87 4.29 2.53 87 145 280 460 97 110 151 160

SINGLE CORE 6.35/11KV (UM=12KV)

Dimensional Data NOM. CROSS- SECTION AREA NOM. INSULATION THICKNESS COPPER TAPE SCREEN AREA NOM. BEDDING THICKNESS NOM. ARMOUR WIRE DIAMETER NOM.SHEATH THICKNESS APPROX. OVERALL DIAMETER APPROX. WEIGHT CU AL MM² MM MM² MM MM MM MM KG/KM 50 3.4 4.4 1.2 1.6 1.8 30.2 1600 1280 70 3.4 4.7 1.2 1.6 1.9 32.0 1840 1400 95 3.4 5.2 1.2 1.6 1.9 33.6 2130 1530 120 3.4 5.5 1.2 1.6 2.0 35.2 2430 1670 150 3.4 5.8 1.2 1.6 2.1 37.9 2870 1930 185 3.4 6.2 1.2 2.0 2.1 39.4 3240 2080 240 3.4 6.8 1.2 2.0 2.2 42.1 3490 2330 300 3.4 7.3 1.2 2.0 2.2 44.1 4490 2560 400 3.4 8.0 1.2 2.0 2.4 48.2 5589 3040 500 3.4 8.6 1.3 2.5 2.5 52.0 6780 3680 630 3.4 9.5 1.4 2.5 2.6 57.4 8230 4200 Electrical Data NOM. CROSS- SECTION AREA 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 SCREEN 1 SEC REACTANCE INDUCTANCE IMPEDANCE TREFOIL FLAT SPACED TREFOIL FLAT SPACED TREFOIL FLAT SPACED COPPER WIRE COPPER TAPE CU AL CU AL MM² ΜΩ/M ΜΩ/M KA PF/M MA/M KA ΜΩ/M ΜΩ/M NH/M NH/M ΜΩ/M ΜΩ/M 70 268/443 343/568 9.8/6.3 288 0.58 1.96 1.19 122 188 390 600 364 583 386 597 95 193/320 248/410 13.3/8.5 323 0.65 1.96 1.31 122 182 390 580 272 427 300 446 120 153/253 196//325 17.2/11.0 353 0.71 1.96 1.43 116 172 370 550 225 345 257 367 150 124/206 159/265 21.2/13.5 380 0.76 3.06 1.52 110 166 350 530 193 287 229 313 185 99.1/164 128/211 26.6/17.0 416 0.83 3.06 1.63 107 166 340 530 165 237 206 267 240 75.4/125 98/161 34.9/22.3 460 0.92 3.06 1.81 104 163 330 520 140 191 185 226 300 60.1/100 80/130 43.8/28.0 506 1.01 3.06 1.95 100 157 320 500 126 163 174 203 400 47/77.8 64/102 57.3/36.6 561 1.12 4.29 2.13 94 154 300 490 113 141 164 184 500 36.6/60.5 51/81 72.3/46.2 619 1.24 4.29 2.37 91 151 290 480 105 124 158 171 630 28.3/46.9 42/64 91.2/58.3 698 1.37 4.29 2.75 91 148 290 470 97 110 151 160

SINGLE CORE 8.7/15KV (UM=17.5KV)

Dimensional Data Nom. Cross- Section Area Nom. Insulation Thickness Copper Wire Screen Area Copper Tape Screen Area Nom. Bedding Thickness Nom.
Armour Wire Diameter Nom. Sheath Thickness Approx. Overall Diameter Approx. Weight CU AL mm² mm mm² mm² mm mm mm mm kg/km 70 4.5 16 9.1 1.2 1.6 1.9 34.2 1970 1520 95 4.5 16 9.8 1.2 2.0 2.0 36.8 2370 1770 120 4.5 16 10.7 1.2 2.0 2.1 38.4 2670 1910 150 4.5 25 11.3 1.2 2.0 2.1 40.1 3020 2080 185 4.5 25 12.2 1.2 2.0 2.2 41.8 3420 2240 240 4.5 25 13.3 1.2 2.0 2.3 44.5 4050 2500 300 4.5 25 14.3 1.2 2.0 2.3 46.5 4680 2780 400 4.5 35 15.5 1.3 2.5 2.5 51.8 5970 3430 500 4.5 35 17.1 1.3 2.5 2.6 54.4 7010 3910 630 4.5 35 18.7 1.4 2.5 2.7 59.8 8480 4420 Electrical Data NOM. CROSS- SECTION AREA 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 SCREEN
1 SEC REACTANCE INDUCTANCE IMPEDANCE TREFOIL FLAT SPACED TREFOIL FLAT SPACED TREFOIL FLAT SPACED COPPER WIRE COPPER TAPE CU AL CU AL MM² ΜΩ/M ΜΩ/M KA PF/M MA/M KA ΜΩ/M ΜΩ/M NH/M NH/M ΜΩ/ M ΜΩ/M 70 268/443 343/568 9.8/6.3 232 0.63 1.96 1.32 132 188 420 600 364 583 386 597 95 193/320 248/410 13.3/8.5 258 0.70 1.96 1.44 126 182 400 580 272 427 300 446 120 153/253 196/325 17.2/11.0 281 0.77 1.96 1.56 119 179 380 570 225 345 257 367 150 124/206 159/265 21.2/13.5 301 0.82 3.06 1.65 113 176 360 560 193 287 229 313 185 99.1/164 128/211 26.6/17.0 329 0.90 3.06 1.79 110 170 350 540 165 237 206 267 240 75.4/125 98/161 34.9/22.3 363 0.99 3.06 1.94 107 166 340 530 140 191 185 226 300 60.1/100 80/130 43.8/28.0 398 1.09 3.06 2.09 104 160 330 510 126 163 174 203 400 47/77.8 64/102 57.3/36.6 439 1.20 4.29 2.26 97 157 310 500 113 141 164 184 500 36.6/60.5 51/81 72.3/46.2 483 1.32 4.29 2.50 94 154 300 490 105 124 158 171 630 28.3/46.9 42/64 91.2/58.3 534 1.46 4.29 2.73 91 151 290 480 97 110 151 160

SINGLE CORE 12.7/22KV (UM=24KV)

Dimensional Data Nom. Cross- Section Area Nom. Insulation Thickness Copper Wire Screen Area Copper Tape Screen Area Nom.Bedding Thickness Nom. Armour Wire Diameter Nom. Sheath Thickness Approx. Overall Diameter Approx. Weight CU AL mm² mm mm² mm² mm mm mm mm kg/km 70 5.5 16 9.9 1.2 2.0 2.0 37.2 2190 1750 95 5.5 16 10.7 1.2 2.0 2.1 39.0 2510 1900 120 5.5 16 11.5 1.2 2.0 2.1 40.4 2810 2040 150 5.5 25 12.1 1.2 2.0 2.2 42.3 3180 2240 185 5.5 25 12.9 1.2 2.0 2.2 43.8 3560 2380 240 5.5 25 14.1 1.2 2.0 2.3 46.5 4200 2640 300 5.5 25 15.1 1.3 2.5 2.4 49.9 5030 3130 400 5.5 35 16.3 1.3 2.5 2.5 53.8 6140 3600 500 5.5 35 17.5 1.4 2.5 2.6 56.6 7210 4100 630 5.5 35 19.5 1.4 2.5 2.8 62.0 8700 4650 SINGLE CORE 19/33KV (UM=36KV) Dimensional Data NOM. CROSS- SECTION
AREA NOM. INSULATION THICKNESS COPPER WIRE SCREEN AREA COPPER TAPE SCREEN AREA NOM.BEDDING THICKNESS NOM. ARMOUR WIRE DIAMETER NOM. SHEATH THICKNESS APPROX. OVERALL DIAMETER APPROX. WEIGHT CU AL MM² MM MM² MM² MM MM MM MM KG/KM 70 8.0 16 11.9 1.2 2.0 2.2 42.6 2560 2120 95 8.0 16 12.7 1.2 2.0 2.3 44.4 2890 2290 120 8.0 16 13.5 1.2 2.0 2.3 45.8 3200 2430 150 8.0 25 14.2 1.3 2.5 2.4 48.9 3760 2830 185 8.0 25 14.9 1.3 2.5 2.5 50.6 4180 3010 240 8.0 25 16.2 1.3 2.5 2.5 53.1 4830 3270 300 8.0 25 17.1 1.4 2.5 2.6 55.5 5540 3630 400 8.0 35 18.4 1.4 2.5 2.7 59.4 6680 4130 500 8.0 35 20.0 1.5 2.5 2.8 62.2 7790 4690 630 8.0 35 21.6 1.5 2.5 2.9 67.4 9290 5220 Electrical Data NOM. CROSS- SECTION AREA 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 SCREEN 1 SEC REACTANCE INDUCTANCE IMPEDANCE TREFOIL FLAT SPACED TREFOIL FLAT SPACED TREFOIL FLAT SPACED COPPER WIRE COPPER TAPE CU AL CU AL MM² ΜΩ/M ΜΩ/M KA PF/M MA/M KA ΜΩ/M ΜΩ/M NH/M NH/M ΜΩ/M ΜΩ/M 70 268/443 343/568 9.8/6.3 154 0.92 1.96 1.74 144 201 460 640 364 583 386 597 95 193/320 248/410 13.3/8.5 169 1.01 1.96 1.85 138 195 440 620 272 427 300 446 120 153/253 196/325 17.2/11.0 183 1.10 1.96 1.97 132 188 420 600 225 345 257 367 150 124/206 159/265 21.2/13.5 194 1.16 3.06 2.07 126 182 400 580 193 287 229 313 185 99.1/164 128/211 26.6/17.0 210 1.26 3.06 2.18 122 182 390 580 165 237 206 267 240 75.4/125 98/161 34.9/22.3 229 1.37 3.06 2.36 119 176 380 560 140 191 185 226 300 60.1/100 80/130 43.8/28.0 249 1.49 3.06 2.50 113 173 360 550 126 163 174 203 400 47/77.8 64/102 57.3/36.6 273 1.64 4.29 2.68 107 163 340 520 113 141 164 184 500 36.6/60.5 51/81 72.3/46.2 298 1.79 4.29 2.92 104 163 330 520 105 124 158 171 630 28.3/46.9 42/64 91.2/58.3 327 1.96 4.29 3.15 100 160 320 510 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 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 70 270/270 210.210 280/280 215/215 270/260 215/210 270/270 210/210 285/310 225/240 370/370 290/290 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 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 70 270/270 210.210 280/280 215/215 270/260 210/205 270/270 210/210 300/320 235/245 365/370 285/285 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 70 270/270 210.210 280/280 215/215 270/260 210/205 270/270 210/210 300/320 235/245 365/370 285/285 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