Coil Wire Chart

darkspeed · 2010.02.10, 08:11:48

AWG = American Wire Gauge size from 0000 to 40
Dia-mils = Diameter in mils (1 mil = .001 inch)
TPI = Turns Per Inch [Note that this is for BARE WIRE. Insulation thickness varies]
Dia-mm = Diameter in millimeters. This was included to help when dealing with metric Coilers.
Circ-mils = Cross sectional Area in Circular Mils. ( circular mils = diameter in mils squared )
Ohms/Kft = Ohms Per 1,000 ft.
Ft/Ohm = Number of feet required for 1 Ohm of resistance
Ft/Lb = Feet Per Pound
Ohms/Lb = Ohms Per Pound
Lb/Kft = Pounds Per 1,000 feet
*AMPS = Conservative Amp Rating based on 750 circulare mils per Amp
MaxAmps = Maximum allowable current based on 500 circular mils per Amp. Do NOT exceed this rating.

AWG Dia-mils TPI Dia-mm Circ-mils Ohms/Kft Ft/Ohm Ft/Lb Ohms/Lb Lb/Kft *Amps MaxAmps

0000 459.99 2.1740 11.684 211592 0.0490 20402 1.5613 0.0001 640.48 282.12 423.18
000 409.63 2.4412 10.405 167800 0.0618 16180 1.9688 0.0001 507.93 223.73 335.60
00 364.79 2.7413 9.2657 133072 0.0779 12831 2.4826 0.0002 402.80 177.43 266.14

AWG Dia-mils TPI Dia-mm Circ-mils Ohms/Kft Ft/Ohm Ft/Lb Ohms/Lb Lb/Kft *Amps MaxAmps

0 324.85 3.0783 8.2513 105531 0.0983 10175 3.1305 0.0003 319.44 140.71 211.06
1 289.29 3.4567 7.3480 83690 0.1239 8069.5 3.9475 0.0005 253.33 111.59 167.38
2 257.62 3.8817 6.5436 66369 0.1563 6399.4 4.9777 0.0008 200.90 88.492 132.74
3 229.42 4.3588 5.8272 52633 0.1970 5075.0 6.2767 0.0012 159.32 70.177 105.27
4 204.30 4.8947 5.1893 41740 0.2485 4024.7 7.9148 0.0020 126.35 55.653 83.480
5 181.94 5.4964 4.6212 33101 0.3133 3191.7 9.9804 0.0031 100.20 44.135 66.203
6 162.02 6.1721 4.1153 26251 0.3951 2531.1 12.585 0.0050 79.460 35.001 52.501
7 144.28 6.9308 3.6648 20818 0.4982 2007.3 15.869 0.0079 63.014 27.757 41.635
8 128.49 7.7828 3.2636 16509 0.6282 1591.8 20.011 0.0126 49.973 22.012 33.018
9 114.42 8.7396 2.9063 13092 0.7921 1262.4 25.233 0.0200 39.630 17.456 26.185

AWG Dia-mils TPI Dia-mm Circ-mils Ohms/Kft Ft/Ohm Ft/Lb Ohms/Lb Lb/Kft *Amps MaxAmps

10 101.90 9.8140 2.5881 10383 0.9989 1001.1 31.819 0.0318 31.428 13.844 20.765
11 90.741 11.020 2.3048 8233.9 1.2596 793.93 40.122 0.0505 24.924 10.978 16.468
12 80.807 12.375 2.0525 6529.8 1.5883 629.61 50.593 0.0804 19.765 8.7064 13.060
13 71.961 13.896 1.8278 5178.3 2.0028 499.31 63.797 0.1278 15.675 6.9045 10.357
14 64.083 15.605 1.6277 4106.6 2.5255 395.97 80.447 0.2031 12.431 5.4755 8.2132
15 57.067 17.523 1.4495 3256.7 3.1845 314.02 101.44 0.3230 9.8579 4.3423 6.5134
16 50.820 19.677 1.2908 2582.7 4.0156 249.03 127.91 0.5136 7.8177 3.4436 5.1654
17 45.257 22.096 1.1495 2048.2 5.0636 197.49 161.30 0.8167 6.1997 2.7309 4.0963
18 40.302 24.813 1.0237 1624.3 6.3851 156.62 203.39 1.2986 4.9166 2.1657 3.2485
19 35.890 27.863 0.9116 1288.1 8.0514 124.20 256.47 2.0648 3.8991 1.7175 2.5762

AWG Dia-mils TPI Dia-mm Circ-mils Ohms/Kft Ft/Ohm Ft/Lb Ohms/Lb Lb/Kft *Amps MaxAmps

20 31.961 31.288 0.8118 1021.5 10.153 98.496 323.41 3.2832 3.0921 1.3620 2.0430
21 28.462 35.134 0.7229 810.10 12.802 78.111 407.81 5.2205 2.4521 1.0801 1.6202
22 25.346 39.453 0.6438 642.44 16.143 61.945 514.23 8.3009 1.9446 0.8566 1.2849
23 22.572 44.304 0.5733 509.48 20.356 49.125 648.44 13.199 1.5422 0.6793 1.0190
24 20.101 49.750 0.5106 404.03 25.669 38.958 817.66 20.987 1.2230 0.5387 0.8081
25 17.900 55.866 0.4547 320.41 32.368 30.895 1031.1 33.371 0.9699 0.4272 0.6408
26 15.940 62.733 0.4049 254.10 40.815 24.501 1300.1 53.061 0.7692 0.3388 0.5082
27 14.195 70.445 0.3606 201.51 51.467 19.430 1639.4 84.371 0.6100 0.2687 0.4030
28 12.641 79.105 0.3211 159.80 64.898 15.409 2067.3 134.15 0.4837 0.2131 0.3196
29 11.257 88.830 0.2859 126.73 81.835 12.220 2606.8 213.31 0.3836 0.1690 0.2535

AWG Dia-mils TPI Dia-mm Circ-mils Ohms/Kft Ft/Ohm Ft/Lb Ohms/Lb Lb/Kft *Amps MaxAmps

30 10.025 99.750 0.2546 100.50 103.19 9.6906 3287.1 339.18 0.3042 0.1340 0.2010
31 8.9276 112.01 0.2268 79.702 130.12 7.6850 4145.0 539.32 0.2413 0.1063 0.1594
32 7.9503 125.78 0.2019 63.207 164.08 6.0945 5226.7 857.55 0.1913 0.0843 0.1264
33 7.0799 141.24 0.1798 50.125 206.90 4.8332 6590.8 1363.6 0.1517 0.0668 0.1003
34 6.3048 158.61 0.1601 39.751 260.90 3.8329 8310.8 2168.1 0.1203 0.0530 0.0795
35 5.6146 178.11 0.1426 31.524 328.99 3.0396 10480 3447.5 0.0954 0.0420 0.0630
36 5.0000 200.00 0.1270 25.000 414.85 2.4105 13215 5481.7 0.0757 0.0333 0.0500
37 4.4526 224.59 0.1131 19.826 523.11 1.9116 16663 8716.2 0.0600 0.0264 0.0397
38 3.9652 252.20 0.1007 15.723 659.63 1.5160 21012 13859 0.0476 0.0210 0.0314
39 3.5311 283.20 0.0897 12.469 831.78 1.2022 26496 22037 0.0377 0.0166 0.0249

AWG Dia-mils TPI Dia-mm Circ-mils Ohms/Kft Ft/Ohm Ft/Lb Ohms/Lb Lb/Kft *Amps MaxAmps

40 3.1445 318.01 0.0799 9.8880 1048.9 0.9534 33410 35040 0.0299 0.0132 0.0198

AWG D.C. OHMS WIRE DIAM APPROX. TURNS PER FEET PER
SIZE PER 1000 FT INCHES INCH, SOLID ENAMEL POUND
COVERED
1 .1264 .2893 X 3.947
2 .1593 .2576 X 4.977
3 .2009 .2294 X 6.276
4 .2533 .2043 X 7.914
5 .3195 .1819 X 9.980
6 .4028 .1620 X 12.58
7 .5080 .1443 X 15.87
8 .6405 .1286 7.6 20.01
9 .8077 .1144 8.6 25.23
10 1.018 .1019 9.6 31.82
11 1.284 .0907 10.7 40.12
12 1.619 .0808 12.0 50.59
13 2.042 .0720 13.5 63.80
14 2.524 .0641 15 80.44
15 3.181 .0571 16.8 101.40
16 4.018 .0508 18.9 127.90
17 5.054 .0453 21.2 161.3
18 6.386 .0403 23.6 203.4
19 8.046 .0359 26.4 256.5
20 10.13 .0320 29.4 323.4
21 12.77 .0285 33.1 407.8
22 16.20 .0253 37.0 514.2
23 20.30 .0226 41.3 648.4
24 25.67 .0201 46.3 817.7
25 32.37 .0179 51.7 1031
26 41.02 .0159 58.0 1300
27 51.44 .0142 64.9 1639
28 65.31 .0126 72.7 2067
29 81.21 .0113 81.6 2607
30 103.7 .0100 90.5 3287
31 130.9 .0089 101 4145
32 162.0 .0080 113 5227
33 205.7 .0071 127 6591
34 261.3 .0063 143 8310
35 330.7 .0056 158 10480
36 414.8 .0050 175 13210
37 512.1 .0045 198 16660
38 648.2 .0040 224 21010
39 846.6 .0036 248 26500
40 1079 .0031 282 33410
41 1323 .0028
42 1659 .0025
43 2143 .0022
44 2593 .0020
45 3348 .00176
46 4207 .00157
47 5291 .00140

************************************************************************
For winding Tesla secondary coils the general consensus is to use
number 22 AWG, or larger diameter, double Formvar Magnet wire. Often
surplus partial spools of odd wire sizes are found, so I took time to
post a more complete chart of AWG numbers and fractional diameters
than is usually available. All information above is approximate
despite the decimal places. Wire diameter, turns per inch, resistance,
feet per pound, etc. all vary slightly from one manufacturer to another.
Insulation thicknesses will vary depending upon type and the supplier.
Turns per inch will also vary with the quality of the winding. In
practice, Tesla coil windings are not perfect (nor do they need to be)
so expect some slight variations from the specification table above.

Room3327 · 2010.02.10, 17:47:00

Great chart darkspeed,
I have been working from a chart like this for over 40 years, the only thing I can add is Don't Worry about maximum amps. Many times that rating is is way overshot, I have a 12 ga. coil I designed for a coil gun that I pump more then a thousand amps through with no problem. You just need to watch your duty cycle to prevent overheating. So in other words there really is no ampere maximum rating for wire as long as you don't run it so hot that you burn it up. If it don't melt you haven't reached maximum.

Room3327

darkspeed · 2010.02.10, 18:02:22

Thanks Room3327

I cant seem to find the AWG joule per picosecond chart

wattsup · 2010.02.10, 19:54:44

@darkspeed

Thanks for this chart. The MaxAmp column is very telling and can give clues on if an inventors device seem plausible to match to their claims. Something like the Don Smith builds, when you consider the output claims, does the output match with the reality of the wire guage of the device. Hmmmmmmm. I wonder.

darkspeed · 2010.02.10, 20:54:49

Hi wattsup,

I think it does, the only wires that will see substantial current are the wires from the cap bank out to the terminal strip through the choke.. 8kv @ 10a is a lot of power