Standard: BS 7671 Table 4E3A Single-core armoured 90 °C thermosetting insulated cables Copper conductors Conductor temperature: 90 °C Ambient temperature: 30 °C Conductor nominal cross- sectional area [mm²] Current-carrying capacities in [A] Reference Method C (clipped direct) Reference Method F (in free air or in perforated cable tray horizontal or vertical) Touching Touching Spaced by one cable diameter 2 cables, single- phase AC or DC flat 3 or 4 cables, three- phase AC flat 2 cables, single- phase AC or DC flat 3 cables, three- phase AC flat 3 cables, three- phase AC trefoil 2 cables DC 2 cables AC single-phase AC 3 or 4 cables three-phase AC Horizontal Vertical Horizontal Vertical Horizontal Vertical 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 12 50 237 220 253 232 222 284 270 282 266 288 266 70 303 277 322 293 285 356 349 357 337 358 331 95 367 333 389 352 246 446 426 436 412 425 393 120 425 383 449 405 402 519 497 504 477 485 449 150 488 437 516 462 463 600 575 566 539 549 510 185 557 496 587 524 529 688 660 643 614 618 574 240 656 579 689 612 625 815 782 749 714 715 666 300 755 662 792 700 720 943 906 842 805 810 755 400 853 717 899 767 815 1137 1094 929 889 848 797 500 962 791 1016 851 918 1314 1266 1032 989 923 871 630 1082 861 1146 935 1027 1528 1474 1139 1092 992 940 800 1170 904 1246 987 1119 1809 1744 1204 1155 1042 978 1000 1261 961 1345 1055 1214 2100 2026 1289 1238 1110 1041