40 ADVANCING NUCLEAR POWER Class K Conductors for General Wiring SPEC B045 June, 2025 ASTM CLASS K Size Stranding Nominal Area Nominal Diameter Nominal Weight AWG/kcmil Inches Circular Mils mm² Inches mm Lbs/kft kg/km 22 — — — — — — — 20 10/.010 1,020 0.52 0.036 0.91 3.2 4.8 18 16/.010 1,620 0.82 0.046 1.20 5 7.4 16 26/.010 2,580 1.31 0.057 1.40 7.97 12 14 41/.010 4,110 2.08 0.071 1.80 12.8 19 12 65/.010 6,530 3.31 0.088 2.20 20.3 30.2 10 105/.010 10,380 5.26 0.112 2.80 33.3 49.6 9 133/.010 13,090 6.63 0.150 3.80 42.4 63.1 8 168/.010 16,510 8.37 0.164 4 53.2 80.8 7 210/.010 20,820 10.50 0.175 4.40 66.8 99.4 6 266/.010 26,240 13.30 0.198 5.00 84.2 125 5 336/.010 33,090 16.80 0.261 6.60 106 158 4 420/.010 41,740 21.20 0.249 6.30 132 196 3 532/.010 52,620 26.70 0.298 7.60 169 251 2 665/.010 66,360 33.60 0.317 8.10 211 314 1 836/.010 83,690 42.40 0.356 9 266 396 1/0 1064/.010 105,600 53.50 0.401 10 338 503 2/0 1323/.010 133,100 67.40 0.501 13 425 632 3/0 1666/.010 167,800 85 0.562 14 535 796 4/0 2107/.010 211,600 107 0.627 15.93 676 1006 250 2499/.010 250,000 127 0.688 17 802 1193 262.6 2220/.010 222,000 112 0.680 17 824 1226 300 2989/.010 300,000 152 0.753 19 960 1428 313.1 3136/.010 313,600 159 0.750 19 969 1442 350 3458/.010 350,000 177 0.818 21 1120 1667 373.7 3737/.010 373,700 189 0.790 20 1210 1800 400 3990/.010 400,000 203 0.878 22 1290 1920 444.4 — — — — — — — 500 5054/.010 500,000 253 0.990 25 1635 2433 535.3 5320/.010 532,000 270 0.950 24 1641 2442 592 — — — — — — — 600 5985/.010 600,000 340 1.125 29 1950 2902 646.4 6466/.010 646,600 328 1.040 26 1987 2957 750 7448/.010 750,000 380 1.276 32 2427 3611 777.7 — — — — — — — 1000 9975/.010 1,000,000 507 1.498 38 3250 4769 1111 — — — — — — — Dimensions and weights are nominal; subject to industry tolerances. Copper Conductor
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