Significance and Use
Scope
1.1 This practice is intended as a guide to shipbuilders, shipowners, and design agents for use in the selection of conductor size for single conductor or multiple conductor cable sizes either in American Wire Gauge (AWG) or metric designations for commercial ship design and construction.
1.2 The comparison chart of electrical conductor sizes shown in Table 1 presents a combined listing of international standard sizes of Class 2 stranded copper conductors in accordance with AWG (Specification B8) English units or IEC (IEC 60228) metric units.
| Size | Size | Area in | AmpacityA | dc Resistances at 20°CB | |
| Ohms | Ohms | ||||
|
| 2000*C | 2 000 000 | 1155 | 0.0053 | 0.0177 |
| 1000* |
| 1 970 000 | 1145 | 0.0054 | 0.0176 |
|
| 1750* | 1 750 000 | 1070 | 0.0063 | 0.0199 |
| 800* |
| 1 580 000 | 1009 | 0.0067 | 0.0224 |
|
| 1500* | 1 500 000 | 980 | 0.0071 | 0.0232 |
|
| 1250* | 1 250 000 | 890 | 0.0085 | 0.0278 |
| 630* |
| 1 240 000 | 886 | 0.0096 | 0.0286 |
|
| 1000* | 1 000 000 | 780 | 0.0106 | 0.0347 |
| 500* |
| 987 000 | 772 | 0.0105 | 0.0369 |
| 400* |
| 789 000 | 675 | 0.0133 | 0.0475 |
|
| 750* | 750 000 | 655 | 0.0141 | 0.0463 |
|
| 600* | 600 000 | 575 | 0.0176 | 0.0578 |
| 300* |
| 592 000 | 570 | 0.0211 | 0.0607 |
|
| 500* | 500 000 | 515 | 0.0211 | 0.0694 |
| 240* |
| 474 000 | 499 | 0.0219 | 0.0762 |
|
| 400* | 400 000 | 455 | 0.0264 | 0.0867 |
| 185* |
| 365 000 | 431 | 0.0286 | 0.1000 |
|
| 350* | 350 000 | 420 | 0.0302 | 0.0990 |
|
| 300* | 300 000 | 375 | 0.0353 | 0.1157 |
| 150* |
| 296 000 | 372 | 0.0353 | 0.1260 |
|
| 250* | 250 000 | 340 | 0.0423 | 0.1388 |
| 120* |
| 237 000 | 327 | 0.0436 | 0.1540 |
|
| 4/0* | 211 600 | 300 | 0.0500 | 0.1639 |
| 95* |
| 187 000 | 265 | 0.0551 | 0.1950 |
|
| 3/0* | 167 000 | 260 | 0.0631 | 0.2065 |
| 70* |
| 138 000 | 230 | 0.0752 | 0.2700 |
|
| 2/0* | 133 100 | 225 | 0.0794 | 0.2605 |
|
| 1/0* | 105 600 | 195 | 0.1002 | 0.3288 |
| 50* |
| 98 700 | 185 | 0.1044 | 0.3910 |
|
| 1 | 83 690 | 165 | 0.1261 | 0.4139 |
| 35* |
| 69 100 | 144 | 0.1495 | 0.5290 |
|
| 2* | 66 360 | 140 | 0.1588 | 0.5211 |
|
| 3 | 52 620 | 120 | 0.2005 | 0.6577 |
| 25* |
| 49 300 | 115 | 0.2057 | 0.7340 |
|
| 4* | 41 740 | 105 | 0.2528 | 0.8295 |
| 16* |
| 31 600 | 89 | 0.3259 | 1.160 |
|
| 6* | 26 240 | 80 | 0.4023 | 1.320 |
| 10* |
| 19 700 | 63 | 0.5167 | 1.840 |
|
| 8* | 16 510 | 55 | 0.6380 | 2.093 |
| 6.0* |
| 11 800 | 43 | 0.8543 | 3.110 |
|
| 10* | 10 380 | 40 | 1.017 | 3.335 |
| 4.0* |
| 7 890 | 30 | 1.304 | 4.700 |
|
| 12* | 6 530 | 25 | 1.620 | 5.315 |
| 2.5* |
| 4 930 | 22 | 2.067 | 7.560 |
|
| 14* | 4 110 | 20 | 2.573 | 8.442 |
| 1.5* |
| 2 960 | . . . | 3.417 | 12.20 |
|
| 16* | 2 580 | . . . | 4.020 | 13.19 |
| 1.0* |
| 1 970 | . . . | 5.213 | 18.20 |
| 0.90 |
| 1 773 | . . . | 6.45 | 21.10 |
|
| 18* | 1 620 | . . . | 6.82 | 20.95 |
| 0.80 |
| 1 576 | . . . | 6.52 | 21.40 |
| 0.75* |
| 1 480 | . . . | 6.82 | 24.80 |
| 0.60* |
| 1 182 | . . . | 9.5 | 31.16 |
|
| 20* | 1 020 | . . . | 10.5 | 34.45 |
| 0.50* |
| 987 | . . . | 11.4 | 36.70 |
|
| 22* | 640 | . . . | 16.9 | 55.44 |
| 0.20* | 24* | 404 | . . . | 26.7 | 87.60 |
|
| 26* | 253 | . . . | 43.6 | 143.04 |
| where: | ||
| RT | = | resistance at reference temperature T, |
| Rt | = | resistance as measured at temperature t, |
| αT | = | known or given temperature coefficient of resistance of the conductor being measured at reference temperature T. At 20°C, the value is 0.003 93, |
| T | = | reference temperature, and |
| t | = | temperature at which measurement is made. |
1.3 As a precautionary caveat, some conductor sizes listed in Table 1 may exceed minimal size requirements of the U.S. Coast Guard, the American Bureau of Shipping, and IEEE STD 45 for specific applications.
