THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE Document Number: EDS 02-0034 ENGINEERING DESIGN STANDARD EDS 02-0034 33KV SINGLE CORE XLPE CABLES Network(s): EPN, LPN, SPN Summary: This standard details the technical and practical information required for the safe and effective use of the new range of 33kV Single Core XLPE Cable to be used by UK Power Networks. Owner: Paul Williams Approved By: Sotiris Georgiopoulos Approved Date: 11/04/2016 This document forms part of the Company s Integrated Business System and its requirements are mandatory throughout UK Power Networks. Departure from these requirements may only be taken with the written approval of the Director of Asset Management. If you have any queries about this document please contact the author or owner of the current issue. Applicable To UK Power Networks All UK Power Networks Asset Management Capital Programme Connections External G81 Website Contractors ICPs/IDNOs Meter Operators HSS&TT Network Operations UK Power Networks Services Other
Revision Record Version 4.0 Review Date 11/04/2021 Date 16/02/2016 Author Paul Williams Why has the document been updated - Document updated reflect the change to a design with aluminium conductors and aluminium wire screens and a change to supplier that have been technically approved to supply the new cable type. What has changed - 1000mm 2 and 1200mm 2 aluminium conductors introduced as replacement for existing 630mm 2 and 800mm 2 copper conductors. All Sections and appendices updated to show the new cable design and conductor sizes. Document transferred onto a new template and rules applied Version 3.0 Review Date 30/06/2015 Date 29/06/2012 Author Michael Sinclair Added Ratings and checked for suitability for publication as a G81 document Version 2.3 Review Date Date 22/08/2011 Author Don Fossett Reclassified from EI to EDS Version 2.2 Review Date Date 14/02/2011 Author Don Fossett Document rebranded Version 2.1 Review Date Date 06/08/2010 Author Paul Williams Review date extend to match duration of current Procurement Contract Version 2.0 Review Date Date 14/08/2007 Author Paul Williams EDF Energy SAP commodity codes amended Version 1.0 Review Date Date 27/04/2007 Author Paul Williams Original Issue UK Power Networks 2016 All rights reserved 2 of 16
Contents 1 Introduction... 4 2 Scope... 4 3 Details... 4 3.1 Standard Drum Details... 4 4 Current Rating Table for 33kV Single Core Cables... 5 4.1 Ratings... 5 4.2 Ratings... 5 5 Current Rating Tables for Comparison with Existing Designs... 6 5.1 Three core H Type PILC Cables... 6 5.1.1 Ratings Copper s... 6 5.1.2 Ratings Aluminium s... 6 5.1.3 Ratings Copper s... 7 5.1.4 Ratings Aluminium s... 7 5.2 Three core Fluid Filled Cables (Lead or Corrugated Aluminium Sheath)... 8 5.2.1 Ratings Copper s... 8 5.2.2 Ratings Aluminium s... 8 5.2.3 Ratings Copper s... 9 5.2.4 Ratings Aluminium s... 9 5.3 Existing Single Core XLPE Cables Aluminium and Copper s... 10 5.3.1 Ratings... 10 5.3.2 Ratings... 10 5.5 Technical Data Sheets... 11 6 Dependent Documents... 12 Appendix A Cable Ratings for Widely Used Installation Conditions... 13 A.1 Laid Direct Circuits Single Circuit... 13 A.2 Laid Direct Circuits Double Circuit (both circuits loaded at the same time)... 14 A.3 Ducted Circuits Single Circuit... 15 A.4 Ducted Circuits Double Circuit (both circuits loaded at the same time)... 16 UK Power Networks 2016 All rights reserved 3 of 16
1 Introduction The purpose of this engineering standard is to provide designers, installers and operators with the necessary technical and practical information required to enable the safe and efficient use of the new range of 33kV Single Core XLPE cables in UK Power Networks (UKPN). 2 Scope This document only covers the five main types of single core 33kV cable supplied by one of the following cable manufacturers: Cabelte (Portugal); Nexans (France, Greece, Norway and Turkey); NKT Cables (Denmark); Solidal (Portugal). The standard sizes are as follows: 300mm 2 aluminium conductor single core XLPE cable with a 82mm 2 aluminium wire screen and a MDPE outer sheath, with a conductive outer layer; 500mm 2 aluminium conductor single core XLPE cable with a 82mm 2 aluminium wire screen and a MDPE outer sheath, with a conductive outer layer; 630mm 2 aluminium conductor single core XLPE cable with a 82mm 2 aluminium wire screen and a MDPE outer sheath, with a conductive outer layer; 1000mm 2 aluminium conductor single core XLPE cable with a 82mm 2 aluminium wire screen and a MDPE outer sheath, with a conductive outer layer; 1200mm 2 aluminium conductor single core XLPE cable with a 82mm 2 aluminium wire screen and a MDPE outer sheath, with a conductive outer layer. Note: All the above are also available with a low smoke zero halogen sheath for installation in cable tunnels, basements, etc. 3 Details 3.1 Standard Drum Details The new range of 33kV cables will only be available from UK Power Networks Logistics Cable Management in the following full drum lengths: Size and Material Standard Drum Length (m) UK Power Networks Stores Code 300mm 2 aluminium 500 06140T 500mm 2 aluminium 500 06141D 630mm 2 aluminium 500 06142N 1000mm 2 aluminium 500 06143X 1200mm 2 aluminium 500 06144H UK Power Networks 2016 All rights reserved 4 of 16
4 Current Rating Table for 33kV Single Core Cables This table provides a guide to the current ratings for 33kV single XLPE core cables. All the ratings quoted are Ratings for 1 single circuit installed in trefoil, solidly bonded only and are in accordance with Engineering Recommendation P17. The MVA ratings are for a three-phase supply. Details for multiple cable circuits are listed in Appendix A: 4.1 Ratings Area mm² 1200 Al Current Rating per Circuit 900mm depth of cover, g = 1.2 C m/watt, ground/air temp = 15 Laid Direct in Ground Installed in Ducts Installed in Free Air (shaded from solar radiation) Amps MVA Amps MVA Amps MVA 614 35.05 506 28.89 639 36.48 812 46.36 666 38.02 866 49.44 929 53.04 782 44.64 1004 57.32 1137 64.91 956 54.58 1231 70.28 1265 72.22 1062 60.63 1390 79.36 4.2 Ratings Area mm² 1200 Al Current Rating per Circuit 900mm depth of cover, g = 1.2 C m/watt, ground/air temp = 10 Laid Direct in Ground Installed in Ducts Installed in Free Air (shaded from solar radiation) Amps MVA Amps MVA Amps MVA 686 39.16 531 30.31 663 37.85 911 52.01 702 40.08 899 51.32 1045 59.66 824 47.04 1042 59.49 1279 73.02 1007 57.49 1278 72.96 1427 81.47 1121 64.00 1442 82.32 UK Power Networks 2016 All rights reserved 5 of 16
5 Current Rating Tables for Comparison with Existing Designs The tables in this section are designed to provide a guide between the current ratings of existing designs and the new 33kV single core cables. All the ratings quoted are Ratings and are in accordance with Engineering Recommendation P17. The MVA ratings are for a three-phase supply. values should generally be used for design purposes as they are the most onerous. 5.1 Three core H Type PILC Cables 5.1.1 Ratings Copper s Area in² 0.10in 2 0.15in 2 0.20in 2 0.25in 2 0.30in 2 0.40in 2 0.50in 2 Current Rating per 900mm depth of cover, g = 1.2 C m/watt. Ground/air temp = 15 C Amps MVA S/C XLPE Amps MVA S/C XLPE Amps MVA S/C XLPE 247 306 360 410 461 543 606 14.10 17.47 20.55 23.41 26.32 31.00 34.60 208 256 301 341 383 455 507 11.87 14.62 17.18 19.47 21.87 25.98 28.94 239 296 350 400 451 535 600 13.64 16.90 19.98 22.84 25.75 30.54 34.25 120mm² 150mm² 240mm² 349 395 448 521 589 669 19.92 22.55 25.58 29.74 33.63 38.19 290 326 370 429 491 556 16.56 18.61 21.12 24.49 28.03 31.74 340 385 439 515 586 671 19.41 21.98 25.06 29.40 33.45 38.31 * In free air shaded from solar radiation 5.1.2 Ratings Aluminium s Area in² 0.20in 2 0.25in 2 0.30in 2 0.40in 2 0.50in 2 Current Rating per 900mm depth of cover, g = 1.2 C m/watt. Ground/air temp = 15 C Amps MVA S/C XLPE Amps MVA S/C XLPE Amps MVA S/C XLPE 281 321 362 428 481 16.04 18.33 20.67 24.43 27.46 234 267 300 359 402 13.36 15.24 17.13 20.50 22.95 273 312 353 421 475 15.59 17.81 20.15 24.03 27.12 120mm² 150mm² 240mm² 274 309 352 412 468 539 15.64 17.64 20.10 23.52 26.72 30.77 227 255 290 339 389 446 12.96 14.56 16.56 19.35 22.21 25.46 265 300 344 404 462 536 15.13 17.13 19.64 23.06 26.38 30.60 * In free air shaded from solar radiation UK Power Networks 2016 All rights reserved 6 of 16
5.1.3 Ratings Copper s Area in² 0.10in 2 0.15in 2 0.20in 2 0.25in 2 0.30in 2 0.40in 2 0.50in 2 Current Rating per 900mm depth of cover, g = 1.2 C m/watt. Ground/air temp = 10 C Laid Direct in Ground Installed in Ducts Installed in Free air* Amps MVA S/C XLPE Amps MVA S/C XLPE Amps MVA S/C XLPE 273 338 399 457 514 607 679 15.59 19.30 22.78 26.09 29.34 34.65 38.76 223 275 324 368 414 492 549 12.73 15.70 18.50 21.01 23.64 28.09 31.34 252 312 369 422 476 564 633 14.39 17.81 21.07 24.09 27.17 32.20 36.14 120mm² 150mm² 240mm² 389 440 501 584 662 754 22.21 25.12 28.60 33.34 37.79 43.05 312 352 400 465 532 604 17.81 20.10 22.84 26.55 30.37 34.48 359 406 463 543 618 708 20.50 23.18 26.43 31.00 35.28 40.42 * In free air shaded from solar radiation 5.1.4 Ratings Aluminium s Area in² 0.20in 2 0.25in 2 0.30in 2 0.40in 2 0.50in 2 Current Rating per 900mm depth of cover, g = 1.2 C m/watt. Ground/air temp = 10 C Amps MVA S/C XLPE Amps MVA S/C XLPE Amps MVA S/C XLPE 311 357 403 479 539 17.75 20.38 23.01 27.35 30.77 255 290 327 388 436 14.56 16.56 18.67 22.15 24.89 287 329 372 444 502 16.38 18.78 21.24 25.35 28.66 120mm² 150mm² 240mm² 304 345 394 462 526 606 17.36 19.70 22.49 26.38 30.03 34.60 246 278 317 371 421 485 14.04 15.87 18.10 21.18 24.03 27.69 279 316 363 427 488 565 15.93 18.04 20.72 24.38 27.86 32.26 * In free air shaded from solar radiation UK Power Networks 2016 All rights reserved 7 of 16
5.2 Three core Fluid Filled Cables (Lead or Corrugated Aluminium Sheath) 5.2.1 Ratings Copper s Area in² 0.15in 2 0.20in 2 0.25in 2 0.30in 2 0.35in 2 0.40in 2 0.45in 2 0.50in 2 0.55in 2 0.60in 2 Current Rating per 900mm depth of cover, g = 1.2 C m/watt. Ground/air temp = 15 C Amps MVA S/C XLPE Amps MVA S/C XLPE Amps MVA S/C XLPE 345 405 463 515 564 598 633 665 698 733 19.70 23.12 26.43 29.40 32.20 34.14 36.14 37.96 39.85 41.85 286 336 382 426 466 495 522 548 576 604 16.33 19.18 21.81 24.32 26.60 28.26 29.80 31.29 32.88 34.48 356 425 491 553 611 651 693 732 776 822 20.32 24.26 28.03 30.41 34.88 37.17 39.56 41.79 44.30 46.93 120mm² 150mm² 240mm² 260mm² 350mm² 500mm² 630mm² 393 443 499 573 596 644 690 724 801 881 22.44 25.29 28.49 32.71 34.03 36.77 39.39 41.33 45.71 50.30 325 366 411 473 492 530 567 595 658 735 18.55 20.89 23.46 27.00 28.09 30.26 32.37 33.97 37.57 41.96 413 471 534 623 650 710 767 810 909 1019 23.58 26.89 30.49 35.57 37.11 40.53 43.79 46.24 51.89 58.17 * In free air shaded from solar radiation 5.2.2 Ratings Aluminium s Area in² 0.20in 2 0.25in 2 0.30in 2 0.35in 2 0.40in 2 0.45in 2 0.50in 2 0.55in 2 0.60in 2 Current Rating per 900mm depth of cover, g = 1.2 C m/watt. Ground / air temp = 15 C Amps MVA S/C XLPE Amps MVA S/C XLPE Amps MVA S/C XLPE 175 233 284 331 371 414 480 535 539 9.99 13.30 16.21 18.90 21.18 23.64 27.40 30.54 30.77 145 192 235 274 307 342 396 442 444 8.28 10.96 13.42 15.64 17.53 19.52 22.61 25.23 25.35 184 247 305 359 403 453 528 594 603 10.50 14.10 17.41 20.50 23.01 25.86 30.14 33.91 34.43 120mm² 150mm² 240mm² 260mm² 350mm² 500mm² 630mm² 306 345 391 451 472 510 551 581 653 734 17.47 19.70 22.32 25.75 26.95 29.12 31.46 33.17 37.28 41.73 253 285 322 373 389 421 453 478 537 612 14.44 16.27 18.38 21.29 22.21 24.03 25.86 27.29 30.66 34.94 322 367 418 490 514 562 611 650 739 846 18.38 20.95 23.86 27.97 29.34 32.68 34.88 37.11 42.19 48.30 * In free air shaded from solar radiation UK Power Networks 2016 All rights reserved 8 of 16
5.2.3 Ratings Copper s Area in² 0.15in 2 0.20in 2 0.25in 2 0.30in 2 0.35in 2 0.40in 2 0.45in 2 0.50in 2 0.55in 2 0.60in 2 Current Rating per 900mm depth of cover, g = 1.2 C m/watt. Ground/air temp = 10 C Amps MVA S/C XLPE Amps MVA S/C XLPE Amps MVA S/C XLPE 388 456 523 582 638 676 718 754 792 832 22.15 26.03 29.86 33.23 36.42 38.59 40.99 43.05 45.22 47.50 305 359 409 457 500 531 561 589 620 651 17.41 20.50 23.35 26.09 28.56 30.31 32.03 33.63 35.40 37.17 371 442 511 576 636 677 722 761 808 855 21.18 25.23 29.17 32.88 36.31 38.65 41.22 43.45 46.13 48.81 120mm² 150mm² 240mm² 260mm² 350mm² 500mm² 630mm² 444 501 565 649 676 732 785 823 911 1005 25.35 28.60 32.26 37.05 38.59 41.79 44.82 46.99 52.01 57.38 347 391 440 507 528 570 611 641 710 793 19.81 22.32 25.12 28.94 30.14 32.54 34.88 36.59 40.53 45.27 429 490 555 648 677 738 798 843 946 1060 24.49 27.97 31.68 36.99 38.65 42.13 45.56 48.13 54.01 60.52 * In free air shaded from solar radiation 5.2.4 Ratings Aluminium s Area in² 0.20in 2 0.25in 2 0.30in 2 0.35in 2 0.40in 2 0.45in 2 0.50in 2 0.55in 2 0.60in 2 Current Rating per 900mm depth of cover, g = 1.2 C m/watt. Ground/air temp = 15 C Amps MVA S/C XLPE Amps MVA S/C XLPE Amps MVA S/C XLPE 197 263 321 375 419 469 544 607 611 11.25 15.01 18.33 21.41 23.92 26.78 31.06 34.65 34.88 155 206 252 294 330 368 426 476 479 8.85 11.76 14.39 16.78 18.84 21.01 24.32 27.17 27.35 191 257 317 373 419 471 549 618 627 10.90 14.67 18.10 21.29 23.92 36.89 31.34 35.28 35.80 120mm² 150mm² 240mm² 260mm² 350mm² 500mm² 630mm² 346 391 442 511 535 579 626 661 742 836 19.75 22.32 25.23 29.17 30.54 33.06 35.74 37.74 42.36 47.73 271 305 345 400 418 452 488 515 580 661 15.47 17.41 19.70 22.84 23.86 25.80 27.86 29.40 33.11 37.74 335 382 435 510 535 584 636 676 770 881 19.13 21.81 24.83 29.12 30.54 33.34 36.31 38.59 43.96 50.30 * In free air shaded from solar radiation UK Power Networks 2016 All rights reserved 9 of 16
5.3 Existing Single Core XLPE Cables Aluminium and Copper s 5.3.1 Ratings Area Solid Al Current Rating per 600mm depth of cover, g = 0.9 C m/watt. Ground/air temp = 15 C Amps MVA S/C XLPE Amps MVA Triplex Amps MVA S/C XLPE 458 605 26.15 34.54 380 500 21.69 28.55 466 627 26.60 35.80 Stranded Cu 500mm² 630mm² 800mm² 594 778 888 1007 1137 1265 33.91 44.42 50.70 57.49 64.91 72.22 1200 Al 491 641 729 825 956 1062 28.03 36.59 41.62 47.10 54.58 60.63 1200 Al 609 812 938 1077 1231 1390 34.77 46.36 53.55 61.49 70.28 79.36 1200 Al *In free air shaded from solar radiation 5.3.2 Ratings Area Solid Al Current Rating per 600mm depth of cover, g = 0.9 C m/watt. Ground / air temp = 10 C Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 510 676 29.12 38.59 396 524 22.61 29.92 483 650 27.57 37.11 Stranded Cu 500mm² 630mm² 800mm² 663 871 996 1132 1279 1427 37.85 49.73 56.86 64.63 73.02 81.47 1200 Al 514 673 767 870 1007 1121 29.34 38.42 43.79 49.67 57.49 64.00 1200 Al 631 843 973 1118 1278 1442 36.02 48.13 55.55 63.83 72.96 82.32 1200 Al *In free air shaded from solar radiation UK Power Networks 2016 All rights reserved 10 of 16
5.5 Technical Data Sheets 1. Solid or stranded aluminium conductor 2. Semi-conducting screen 3. XLPE insulation 4. Bonded semi-conducting screen 5. 82mm² Aluminium wire screen 6. Water swellable tapes above and below aluminium wire screen 7. Black MDPE sheath with conductive outer layer Nominal cross-sectional area mm² 300 500 630 Approximate diameter over conductor mm 20.5 24.3 27.8 Nominal insulation thickness mm 8.0 8.0 8.0 Nominal area of aluminium wire screen mm² 82 82 82 Minimum average thickness of oversheath mm 1.72 2.6 2.7 Approximate overall diameter of Single Core mm 49.5 56.0 60.0 Approximate cable weight kg/m 2.27 2.95 3.49 Minimum bending radius mm 495 795 850 Maximum pulling tension on Single Core kn 9.0 14.6 17.8 Nominal internal diameter of duct mm 150 150 190 Maximum DC screen resistance @ 20 C /km 0.387 0.387 0.387 Approximate Capacitance (C) µf/km 0.262 0.289 0.320 Maximum DC resistance (R) @ 20 C /km 0.100 0.061 0.047 Maximum AC resistance (R ) @ 90 C /km 0.1293 0.0797 0.0629 Inductance (L) @ 50Hz @ 90 C mh/km 0.341 0.317 0.310 Reactance (X) @ 50Hz @ 90 C /km 0.107 0.100 0.097 Zero Sequence Resistance /km 0.615 0.566 0.548 Zero Sequence Reactance /km 0.056 0.049 0.045 Positive Sequence Resistance /km 0.136 0.086 0.069 Positive Sequence Reactance /km 0.112 0.104 0.100 Short circuit ratings 1 Second short circuit rating of conductor (90 to 250 C) ka 28.2 47.2 59.5 1 Second short circuit rating of copper wire screen (80 to 250 C) ka 8.6 8.6 8.6 UK Power Networks 2016 All rights reserved 11 of 16
Technical Data Sheets Continued 1. Solid or stranded aluminium conductor 2. Semi-conducting screen 3. XLPE insulation 4. Bonded semi-conducting screen 5. 82mm² Aluminium wire screen 6. Water swellable tapes above and below aluminium wire screen 7. Black MDPE sheath with conductive outer layer Nominal cross-sectional area mm² 1000 1200 Approximate diameter over conductor mm 35.6 41.5 Approximate thickness of conductor screen mm 0.50 0.50 Nominal insulation thickness mm 8.0 8.0 Approximate thickness of insulation screen mm 1.00 1.00 Nominal area of aluminium wire screen mm² 82 82 Minimum average thickness of oversheath mm 3.0 2.28 Approximate overall diameter of Single Core mm 69.0 73.0 Approximate cable weight kg/m 4.88 5.85 Minimum bending radius mm 975 1700 Maximum pulling tension on Single Core kn 27.0 4000 Nominal internal diameter of duct mm 190 190 Maximum DC screen resistance @ 20 C /km 0.389 0.387 Approximate Capacitance (C) µf/km 0.349 0.450 Maximum DC resistance (R) @ 20 C /km 0.0291 0.0247 Maximum AC resistance (R ) @ 90 C /km 0.0405 0.0369 Inductance (L) @ 50Hz @ 90 C mh/km 0.310 0.31 Reactance (X) @ 50Hz @ 90 C /km 0.097 0.094 Zero Sequence Resistance /km 0.526 0.519 Zero Sequence Reactance /km 0.045 0.043 Positive Sequence Resistance /km 0.046 0.039 Positive Sequence Reactance /km 0.101 0.097 Short circuit ratings 1 Second Short Circuit Rating of (90 to 250 C) ka 94.5 114.4 1 Second Short Circuit Rating of Copper wire screen (80 to 250 C) ka 8.6 7.5 6 Dependent Documents This document is referenced in the following documents, any of which may be affected by updates. EDS 08-0145 EDS 08-0150 EHV Design London 33kV Network Design and Customer Supplies UK Power Networks 2016 All rights reserved 12 of 16
Appendix A Cable Ratings for Widely Used Installation Conditions A.1 Laid Direct Circuits Single Circuit 900mm mmm A.1.1 Ratings Size and Material 300mm 2 Al 456 26.03 614 35.05 500mm 2 Al 591 33.74 812 46.36 630mm 2 Al 670 38.25 929 53.04 1000mm 2 Al 829 47.33 1173 66.97 1200mm 2 Al 901 51.44 1265 72.22 A.1.2 Ratings Size and Material 300mm 2 Al 527 30.09 686 39.16 500mm 2 Al 686 39.16 911 52.01 630mm 2 Al 778 44.42 1045 59.99 1000mm 2 Al 965 54.09 1325 77.19 1200mm 2 Al 1049 59.89 1427 81.47 UK Power Networks 2016 All rights reserved 13 of 16
A.2 Laid Direct Circuits Double Circuit (both circuits loaded at the same time) 900mm mmm 300mm A.2.1 Ratings Size and Material 300mm 2 Al 436 24.89 586 33.45 500mm 2 Al 562 32.08 773 44.13 630mm 2 Al 637 36.37 883 50.41 1000mm 2 Al 785 44.82 1111 63.43 1200mm 2 Al 855 48.81 1200 68.51 A.2.2 Ratings Size and Material 300mm 2 Al 509 29.06 663 37.83 500mm 2 Al 661 37.75 878 50.14 630mm 2 Al 748 42.73 1005 57.39 1000mm 2 Al 926 52.87 1271 72.56 1200mm 2 Al 1008 57.55 1372 78.33 UK Power Networks 2016 All rights reserved 14 of 16
A.3 Ducted Circuits Single Circuit 900mm mmm A.3.1 Ratings Size and Material 300mm 2 Al 403 23.01 506 28.89 500mm 2 Al 521 29.74 666 38.02 630mm 2 Al 604 34.38 782 44.64 1000mm 2 Al 744 42.47 984 56.18 1200mm 2 Al 810 46.24 1062 60.63 A.3.2 Ratings Size and Material 300mm 2 Al 445 25.41 531 30.31 500mm 2 Al 579 33.06 702 40.08 630mm 2 Al 670 38.25 824 47.04 1000mm 2 Al 832 47.50 1042 59.49 1200mm 2 Al 902 51.50 1121 64.00 UK Power Networks 2016 All rights reserved 15 of 16
A.4 Ducted Circuits Double Circuit (both circuits loaded at the same time) 900mm mmm 300mm A.4.1 Ratings Size and Material 300mm 2 Al 393 22.44 494 28.20 500mm 2 Al 509 29.06 650 37.11 630mm 2 Al 590 33.68 764 43.62 1000mm 2 Al 726 41.45 961 54.86 1200mm 2 Al 791 45.16 1037 59.20 A.4.2 Ratings Size and Material 300mm 2 Al 437 24.97 522 29.80 500mm 2 Al 569 32.49 690 39.40 630mm 2 Al 659 37.90 810 46.24 1000mm 2 Al 817 46.64 1024 58.46 1200mm 2 Al 886 50.58 1103 62.97 UK Power Networks 2016 All rights reserved 16 of 16