Chapter 6 Conductors 87 Copyright Goodheart-Willcox Co., Inc. 18 18 16 16 14 14 12 12 10 10 8 8 6 4 3 2 1 1/0 2/0 3/0 4/0 250 300 350 400 500 600 700 750 800 900 1000 1250 1500 1750 2000 1 7 1 7 1 7 1 7 1 7 1 7 7 7 7 7 19 19 19 19 19 37 37 37 37 37 61 61 61 61 61 61 91 91 127 127 — 0.39 — 0.49 — 0.62 — 0.78 — 0.98 — 1.23 1.56 1.96 2.20 2.47 1.69 1.89 2.13 2.39 2.68 2.09 2.29 2.47 2.64 2.95 2.52 2.72 2.82 2.91 3.09 3.25 2.98 3.26 2.98 3.19 1.02 1.16 1.29 1.46 1.63 1.85 2.05 2.32 2.588 2.95 3.264 3.71 4.67 5.89 6.60 7.42 8.43 9.45 10.62 11.94 13.41 14.61 16.00 17.30 18.49 20.65 22.68 24.49 25.35 26.16 27.79 29.26 32.74 35.86 38.76 41.45 0.040 0.046 0.051 0.058 0.064 0.073 0.081 0.092 0.102 0.116 0.128 0.146 0.184 0.232 0.260 0.292 0.332 0.372 0.418 0.470 0.528 0.575 0.630 0.681 0.728 0.813 0.893 0.964 0.998 1.030 1.094 1.152 1.289 1.412 1.526 1.632 0.001 0.002 0.002 0.003 0.003 0.004 0.005 0.006 0.008 0.011 0.013 0.017 0.027 0.042 0.053 0.067 0.087 0.109 0.137 0.173 0.219 0.260 0.312 0.364 0.416 0.519 0.626 0.730 0.782 0.834 0.940 1.042 1.305 1.566 1.829 2.092 7.77 7.95 4.89 4.99 3.07 3.14 1.93 1.98 1.21 1.24 0.764 0.778 0.491 0.308 0.245 0.194 0.154 0.122 0.0967 0.0766 0.0608 0.0515 0.0429 0.0367 0.0321 0.0258 0.0214 0.0184 0.0171 0.0161 0.0143 0.0129 0.0103 0.00858 0.00735 0.00643 8.08 8.45 5.08 5.29 3.19 3.26 2.01 2.05 1.26 1.29 0.786 0.809 0.510 0.321 0.254 0.201 0.160 0.127 0.101 0.0797 0.0626 0.0535 0.0446 0.0382 0.0331 0.0265 0.0223 0.0189 0.0176 0.0166 0.0147 0.0132 0.0106 0.00883 0.00756 0.00662 42.0 42.8 26.4 26.9 16.6 16.9 10.45 10.69 6.561 6.679 4.125 4.204 2.652 1.666 1.320 1.045 0.829 0.660 0.52 0.413 0.328 0.2778 0.2318 0.1984 0.1737 0.1391 0.1159 0.0994 0.0927 0.0868 0.0770 0.0695 0.0554 0.0464 0.0397 0.0348 12.8 13.1 8.05 8.21 5.06 5.17 3.18 3.25 2.00 1 2.04 9 1.26 5 1.28 4 0.808 52 0.508 66 0.403 20 0.319 4 0.253 29 0.201 60 0.159 23 0.126 13 0.100 28 0.0847 0.0707 0.0605 0.0529 0.0424 0.0353 0.0303 0.0282 0.0265 0.0235 0.0212 0.0169 0.0141 0.0121 0.0106 26.5 27.7 16.7 17.3 10.4 10.7 6.57 6.73 4.148 4.226 2.579 2.653 1.671 1.053 0.833 0.661 0.524 0.415 0.329 0.2610 0.2050 0.1753 0.1463 0.1252 0.1084 0.0869 0.0732 0.0622 0.0579 0.0544 0.0481 0.0434 0.0347 0.02814 0.02410 0.02109 25.5 26.1 16.0 16.4 10.1 10.3 6.34 6.50 3.984 4.070 2.506 2.551 1.608 1.010 0.802 0.634 0.505 0.399 0.3170 0.2512 0.1996 0.1687 0.1409 0.1205 0.1053 0.0845 0.0704 0.0603 0.0563 0.0528 0.0470 0.0423 0.0338 0.02814 0.02410 0.02109 0.823 1.06 1.31 1.68 2.08 2.68 3.31 4.25 5.26 6.76 8.37 10.76 17.09 27.19 34.28 43.23 55.80 70.41 88.74 111.9 141.1 168 201 235 268 336 404 471 505 538 606 673 842 1011 1180 1349 — 0.015 — 0.019 — 0.024 — 0.030 — 0.038 — 0.049 0.061 0.077 0.087 0.097 0.066 0.074 0.084 0.094 0.106 0.082 0.090 0.097 0.104 0.116 0.099 0.107 0.111 0.114 0.122 0.128 0.117 0.128 0.117 0.126 1620 1620 2580 2580 4110 4110 6530 6530 10380 10380 16510 16510 26240 41740 52620 66360 83690 105600 133100 167800 211600 — — — — — — — — — — — — — — 0.823 0.823 1.31 1.31 2.08 2.08 3.31 3.31 5.261 5.261 8.367 8.367 13.30 21.15 26.67 33.62 42.41 53.49 67.43 85.01 107.2 127 152 177 203 253 304 355 380 405 456 507 633 760 887 1013 Notes: 1. These resistance values are valid only for the parameters as given. Using conductors having coated strands, different stranding type, and, especially, other temperatures changes the resistance. 2. Equation for temperature change: R2 = R1 [1 + α (T2 T T − 75)] where: αcu = 0.00323, αAL α = 0.00330 at 75° L C. 3. Conductors with compact and compressed stranding have about 9 percent and 3 percent, respectively, smaller bare conductor diameters than those shown. See Table 5A for actual compact cable dimensions. 4. The IACS conductivities used: bare copper = 100%, aluminum = 61%. 5. Class B stranding is listed as well as solid for some sizes. Its overall diameter and area is that of its circumscribing circle. Informational Note: The construction information is in accordance with NEMA WC/70-2009 or ANSI/UL. 1581-2001. The resistance is calculated in accordance with National Bureau of Standards Handbook 100, dated 1966, and Handbook 109, dated 1972. Table 8 Conductor Properties Area ohm/ km ohm/ kFT ohm/ kFT ohm/ km ohm/ kFT Uncoated Area Diameter Diameter Stranding Copper Aluminum Conductors Direct-Current Resistance at 75°C (167°F) Coated ohm/ km Circular mils Quantity mm in. mm2 in.2 mm2 Size (AWG or kcmil) AWG sizes Conductor resistance Area of conductor, including voids for stranded conductors 0 .02 109 Circular mils sizes (kcmil)— 405 Copyright © 2016 NFPA Figure 6-3. This table, from Chapter 9 of the Code, provides conductor size and resistance.