Soild copper wire table: below
Soild copper wire table:
Size | Diameter | Cross-sectional | area | Weight |
---|---|---|---|---|
AWG | inches | cir. mils | sq. inches | lb/1000 ft |
4/0 | 0.4600 | 211,600 | 0.1662 | 640.5 |
3/0 | 0.4096 | 167,800 | 0.1318 | 507.9 |
2/0 | 0.3648 | 133,100 | 0.1045 | 402.8 |
1/0 | 0.3249 | 105,500 | 0.08289 | 319.5 |
1 | 0.2893 | 83,690 | 0.06573 | 253.5 |
2 | 0.2576 | 66,370 | 0.05213 | 200.9 |
3 | 0.2294 | 52,630 | 0.04134 | 159.3 |
4 | 0.2043 | 41,740 | 0.03278 | 126.4 |
5 | 0.1819 | 33,100 | 0.02600 | 100.2 |
6 | 0.1620 | 26,250 | 0.02062 | 79.46 |
7 | 0.1443 | 20,820 | 0.01635 | 63.02 |
8 | 0.1285 | 16,510 | 0.01297 | 49.97 |
9 | 0.1144 | 13,090 | 0.01028 | 39.63 |
10 | 0.1019 | 10,380 | 0.008155 | 31.43 |
11 | 0.09074 | 8,234 | 0.006467 | 24.92 |
12 | 0.08081 | 6,530 | 0.005129 | 19.77 |
13 | 0.07196 | 5,178 | 0.004067 | 15.68 |
14 | 0.06408 | 4,107 | 0.003225 | 12.43 |
15 | 0.05707 | 3,257 | 0.002558 | 9.858 |
16 | 0.05082 | 2,583 | 0.002028 | 7.818 |
17 | 0.04526 | 2,048 | 0.001609 | 6.200 |
18 | 0.04030 | 1,624 | 0.001276 | 4.917 |
19 | 0.03589 | 1,288 | 0.001012 | 3.899 |
20 | 0.03196 | 1,022 | 0.0008023 | 3.092 |
21 | 0.02846 | 810.1 | 0.0006363 | 2.452 |
22 | 0.02535 | 642.5 | 0.0005046 | 1.945 |
23 | 0.02257 | 509.5 | 0.0004001 | 1.542 |
24 | 0.02010 | 404.0 | 0.0003173 | 1.233 |
25 | 0.01790 | 320.4 | 0.0002517 | 0.9699 |
26 | 0.01594 | 254.1 | 0.0001996 | 0.7692 |
27 | 0.01420 | 201.5 | 0.0001583 | 0.6100 |
28 | 0.01264 | 159.8 | 0.0001255 | 0.4837 |
29 | 0.01126 | 126.7 | 0.00009954 | 0.3836 |
30 | 0.01003 | 100.5 | 0.00007894 | 0.3042 |
31 | 0.008928 | 79.70 | 0.00006260 | 0.2413 |
32 | 0.007950 | 63.21 | 0.00004964 | 0.1913 |
33 | 0.007080 | 50.13 | 0.00003937 | 0.1517 |
34 | 0.006305 | 39.75 | 0.00003122 | 0.1203 |
35 | 0.005615 | 31.52 | 0.00002476 | 0.09542 |
36 | 0.005000 | 25.00 | 0.00001963 | 0.07567 |
37 | 0.004453 | 19.83 | 0.00001557 | 0.06001 |
38 | 0.003965 | 15.72 | 0.00001235 | 0.04759 |
39 | 0.003531 | 12.47 | 0.000009793 | 0.03774 |
40 | 0.003145 | 9.888 | 0.000007766 | 0.02993 |
41 | 0.002800 | 7.842 | 0.000006159 | 0.02374 |
42 | 0.002494 | 6.219 | 0.000004884 | 0.01882 |
43 | 0.002221 | 4.932 | 0.000003873 | 0.01493 |
44 | 0.001978 | 3.911 | 0.000003072 | 0.01184 |
Ampacities of copper wire: below
Ampacities of copper wire, in free air at 30o C:
INSULATION TYPE: | |||
---|---|---|---|
RUW, T | THW, THWN | FEP, FEPB | |
TW | RUH | THHN, XHHW | |
Size | Current Rating | Current Rating | Current Rating |
AWG | @ 60 degrees C | @ 75 degrees C | @ 90 degrees C |
20 | *9 | *12.5 | |
18 | *13 | 18 | |
16 | *18 | 24 | |
14 | 25 | 30 | 35 |
12 | 30 | 35 | 40 |
10 | 40 | 50 | 55 |
8 | 60 | 70 | 80 |
6 | 80 | 95 | 105 |
4 | 105 | 125 | 140 |
2 | 140 | 170 | 190 |
1 | 165 | 195 | 220 |
1/0 | 195 | 230 | 260 |
2/0 | 225 | 265 | 300 |
3/0 | 260 | 310 | 350 |
4/0 | 300 | 360 | 405 |
* = estimated values; normally, these small wire sizes are not manufactured with these insulation types, above.
Specific resistance table: below
Specific resistance at 20o C:
Material | Element/Alloy | (ohm-cmil/ft) | (ohm-cm·10-6) |
---|---|---|---|
Nichrome | Alloy | 675 | 112.2 |
Nichrome V | Alloy | 650 | 108.1 |
Manganin | Alloy | 290 | 48.21 |
Constantan | Alloy | 272.97 | 45.38 |
Steel* | Alloy | 100 | 16.62 |
Platinum | Element | 63.16 | 10.5 |
Iron | Element | 57.81 | 9.61 |
Nickel | Element | 41.69 | 6.93 |
Zinc | Element | 35.49 | 5.90 |
Molybdenum | Element | 32.12 | 5.34 |
Tungsten | Element | 31.76 | 5.28 |
Aluminum | Element | 15.94 | 2.650 |
Gold | Element | 13.32 | 2.214 |
Copper | Element | 10.09 | 1.678 |
Silver | Element | 9.546 | 1.587 |
* = Steel alloy at 99.5% iron, 0.5% carbon |
Temperature coefficient table: below
Temperature coefficient (α) per degree C:
Material | Element/Alloy | Temp. coefficient |
---|---|---|
Nickel | Element | 0.005866 |
Iron | Element | 0.005671 |
Molybdenum | Element | 0.004579 |
Tungsten | Element | 0.004403 |
Aluminum | Element | 0.004308 |
Copper | Element | 0.004041 |
Silver | Element | 0.003819 |
Platinum | Element | 0.003729 |
Gold | Element | 0.003715 |
Zinc | Element | 0.003847 |
Steel* | Alloy | 0.003 |
Nichrome | Alloy | 0.00017 |
Nichrome V | Alloy | 0.00013 |
Manganin | Alloy | 0.000015 |
Constantan | Alloy | ±0.000074 |
* = S teel alloy at 99.5% iron, 0.5% carbon |
Critical temperature, superconductors below
Critical temperatures given in Kelvins
Material | Element or Alloy | Critical temperature(K) |
---|---|---|
Aluminum | Element | 1.20 |
Cadmium | Element | 0.56 |
Lead | Element | 7.2 |
Mercury | Element | 4.16 |
Niobium | Element | 8.70 |
Thorium | Element | 1.37 |
Tin | Element | 3.72 |
Titanium | Element | 0.39 |
Uranium | ELement | 1.0 |
Zinc | Element | 0.91 |
Niobium/Tin | Alloy | 18.1 |
Cupric sulphide | Compound | 1.6 |
Critical temperatures, high temperature superconuctors below
Critical temperatures, high temperature superconuctors in Kelvins
Material | Critical temperature(K) |
---|---|
HgBa2Ca2Cu3O8+d | 150 (23.5 GPa pressure) |
HgBa2Ca2Cu3O8+d | 133 |
Tl2Ba2Ca2Cu3O10 | 125 |
YBa2Cu3O7 | 90 |
La1.85Sr0.15CuO4 | 40 |
Cs3C60 | 40(15 Kbar pressure) |
Ba0.6K0.4BiO3 | 30 |
Nd1.85Ce0.15CuO4 | 22 |
K3C60 | 19 |
PbMo6S8 | 12.6 |
Note: all critical temperatures given at zero magnetic field strength, above.
Dielectric strength: below
Dielectric strength in kilovolts per inch (kV/in):
Material* | Dielectric strength |
---|---|
Vacuum | 20 |
Air | 20 to 75 |
Porcelain | 40 to 200 |
Paraffin Wax | 200 to 300 |
Transformer Oil | 400 |
Bakelite | 300 to 550 |
Rubber | 450 to 700 |
Shellac | 900 |
Paper | 1250 |
Teflon | 1500 |
Glass | 2000 to 3000 |
Mica | 5000 |
* = Materials listed are specially prepared for electrical use, above.
Tables of specific resistance and temperature coefficient of resistance for elemental materials (not alloys) were derived from figures found in the 78th edition of the CRC Handbook of Chemistry and Physics. Superconductivity data from Collier's Encyclopedia (volume 21, 1968, page 640).
Lessons In Electric Circuits copyright (C) 2000-2023 Tony R. Kuphaldt, under the terms and conditions of the CC BY License.