Engineering Tables/Standard Wire Gauge

Standard Wire GaugeDiameterTurns of wireCross-sectional areaRes. per length (for copper wire)Mass per lengthCurrent Capacity (A)inmmin−1mm−1kcmilmm2Ω/kftΩ/kmlb/ftkg/m750 cmil/A 500 cmil/A0000000 (7/0) 0.500 12.7 2.00 0.0787 250 127 0.136 0.447 0.759 1.13 333 500000000 (6/0) 0.464 11.8 2.16 0.0848 215 109 0.158 0.519 0.654 0.973 287 43100000 (5/0) 0.432 11.0 2.31 0.0911 187 94.6 0.182 0.598 0.567 0.844 249 3730000 (4/0) 0.400 10.2 2.50 0.0984 160 81.1 0.213 0.698 0.486 0.723 213 320000 (3/0) 0.372 9.45 2.69 0.106 138 70.1 0.246 0.807 0.420 0.625 185 27700 (2/0) 0.348 8.84 2.87 0.113 121 61.4 0.281 0.922 0.368 0.547 161 2420 (1/0) 0.324 8.23 3.09 0.122 105 53.2 0.324 1.06 0.319 0.474 140 210 1 0.300 7.62 3.33 0.131 90.0 45.6 0.378 1.24 0.273 0.407 120 180 2 0.276 7.01 3.62 0.143 76.2 38.6 0.447 1.47 0.231 0.344 102 152 3 0.252 6.40 3.97 0.156 63.5 32.2 0.536 1.76 0.193 0.287 84.7 127 4 0.232 5.89 4.31 0.170 53.8 27.3 0.632 2.07 0.163 0.243 71.8 108 5 0.212 5.38 4.72 0.186 44.9 22.8 0.757 2.48 0.137 0.203 59.9 89.9 6 0.192 4.88 5.21 0.205 36.9 18.7 0.923 3.03 0.112 0.167 49.2 73.7 7 0.176 4.47 5.68 0.224 31.0 15.7 1.10 3.60 0.0941 0.140 41.3 62.0 8 0.160 4.06 6.25 0.246 25.6 13.0 1.33 4.36 0.0778 0.116 34.1 51.2 9 0.144 3.66 6.94 0.273 20.7 10.5 1.64 5.38 0.0630 0.0937 27.6 41.5 10 0.128 3.25 7.81 0.308 16.4 8.30 2.08 6.81 0.0498 0.0741 21.8 32.8 11 0.116 2.95 8.62 0.339 13.5 6.82 2.53 8.30 0.0409 0.0608 17.9 26.9 12 0.104 2.64 9.62 0.379 10.8 5.48 3.15 10.3 0.0329 0.0489 14.4 21.6 13 0.0920 2.34 10.9 0.428 8.46 4.29 4.02 13.2 0.0257 0.0383 11.3 16.9 14 0.0800 2.03 12.5 0.492 6.40 3.24 5.32 17.4 0.0194 0.0289 8.53 12.8 15 0.0720 1.83 13.9 0.547 5.18 2.63 6.56 21.5 0.0157 0.0234 6.91 10.4 16 0.0640 1.63 15.6 0.615 4.10 2.08 8.31 27.3 0.0124 0.0185 5.46 8.19 17 0.0560 1.42 17.9 0.703 3.14 1.59 10.9 35.6 0.00952 0.0142 4.18 6.27 18 0.0480 1.22 20.8 0.820 2.30 1.17 14.8 48.5 0.00700 0.0104 3.07 4.61 19 0.0400 1.02 25.0 0.984 1.60 0.811 21.3 69.8 0.00486 0.00723 2.13 3.20 20 0.0360 0.914 27.8 1.09 1.30 0.657 26.3 86.1 0.00394 0.00586 1.73 2.59 21 0.0320 0.813 31.3 1.23 1.02 0.519 33.2 109 0.00311 0.00463 1.37 2.05 22 0.0280 0.711 35.7 1.41 0.784 0.397 43.4 142 0.00238 0.00354 1.05 1.57 23 0.0240 0.610 41.7 1.64 0.576 0.292 59.1 194 0.00175 0.00260 0.768 1.15 24 0.0220 0.559 45.5 1.79 0.484 0.245 70.3 231 0.00147 0.00219 0.645 0.968 25 0.0200 0.508 50.0 1.97 0.400 0.203 85.1 279 0.00121 0.00181 0.533 0.800 26 0.0180 0.457 55.6 2.19 0.324 0.164 105 345 984µ 0.00146 0.432 0.648 27 0.0164 0.417 61.0 2.40 0.269 0.136 127 415 817µ 0.00122 0.359 0.538 28 0.0148 0.376 67.6 2.66 0.219 0.111 155 510 665µ 990µ 0.292 0.438 29 0.0136 0.345 73.5 2.89 0.185 0.0937 184 604 562µ 836µ 0.247 0.370 30 0.0124 0.315 80.6 3.18 0.154 0.0779 221 726 467µ 695µ 0.205 0.308 31 0.0116 0.295 86.2 3.39 0.135 0.0682 253 830 409µ 608µ 0.179 0.269 32 0.0108 0.274 92.6 3.65 0.117 0.0591 292 957 354µ 527µ 0.156 0.233 33 0.0100 0.254 100 3.94 0.100 0.0507 340 1120 304µ 452µ 0.133 0.200 34 0.00920 0.234 109 4.28 0.0846 0.0429 402 1320 257µ 383µ 0.113 0.169 35 0.00840 0.213 119 4.69 0.0706 0.0358 482 1580 214µ 319µ 0.0941 0.141 36 0.00760 0.193 132 5.18 0.0578 0.0293 589 1930 175µ 261µ 0.0770 0.116 37 0.00680 0.173 147 5.79 0.0462 0.0234 736 2410 140µ 209µ 0.0617 0.0925 38 0.00600 0.152 167 6.56 0.0360 0.0182 945 3100 109µ 163µ 0.0480 0.0720 39 0.00520 0.132 192 7.57 0.0270 0.0137 1260 4130 82.1µ 122µ 0.0361 0.0541 40 0.00480 0.122 208 8.20 0.0230 0.0117 1480 4850 70.0µ 104µ 0.0307 0.0461 41 0.00440 0.112 227 8.95 0.0194 0.00981 1760 5770 58.8µ 87.5µ 0.0258 0.0387 42 0.00400 0.102 250 9.84 0.0160 0.00811 2130 6980 48.6µ 72.3µ 0.0213 0.0320 43 0.00360 0.0914 278 10.9 0.0130 0.00657 2630 8610 39.4µ 58.6µ 0.0173 0.0259 44 0.00320 0.0813 313 12.3 0.0102 0.00519 3320 10900 31.1µ 46.3µ 0.0137 0.0205 45 0.00280 0.0711 357 14.1 0.00784 0.00397 4340 14200 23.8µ 35.4µ 0.0105 0.0157 46 0.00240 0.0610 417 16.4 0.00576 0.00292 5910 19400 17.5µ 26.0µ 0.00768 0.0115 47 0.00200 0.0508 500 19.7 0.00400 0.00203 8510 27900 12.1µ 18.1µ 0.00533 0.00800 48 0.00160 0.0406 625 24.6 0.00256 0.00130 13300 43600 7.78µ 11.6µ 0.00341 0.00512 49 0.00120 0.0305 833 32.8 0.00144 730µ 23600 77500 4.37µ 6.51µ 0.00192 0.00288 50 0.00100 0.0254 1000 39.4 0.00100 507µ 34000 112000 3.04µ 4.52µ 0.00133 0.00200 Notes: All values are rounded to three significant figures. Values less than 1×10−6 are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m3 is used to derive the mass An allowance of 750 cmil/A is generally sufficient for calculating current capacity. The more relaxed 500 cmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings.:Engineering Tables/Standard Wire Gauge