AWG Wire Sizes (see table below)
AWG: In the American Wire Gauge (AWG), diameters can be calculated by applying the formula D(AWG)=.005·92((36-AWG)/39) inch. For the 00, 000, 0000 etc. gauges you use -1, -2, -3, which makes more sense mathematically than "double nought." This means that in American wire gage every 6 gauge decrease gives a doubling of the wire diameter, and every 3 gauge decrease doubles the wire cross sectional area. Similar to dB in signal and power levels. An approximate form of this formula contributed by Mario Rodriguez is D = .460 * (57/64)(awg +3) or D = .460 * (0.890625)(awg +3).
Metric Wire Gauges (see table below)
Metric Gauge: In the Metric Gauge scale, the gauge is 10 times the diameter in
millimeters, so a 50 gauge metric wire would be 5 mm in diameter. Note that in
AWG the diameter goes up as the gauge goes down, but for metric gauges it is the
opposite. Probably because of this confusion, most of the time metric sized wire
is specified in millimeters rather than metric gauges.
Load Carrying Capacities (see table below)
The following chart is a guideline of ampacity or copper wire current carrying
capacity following the Handbook of Electronic Tables and Formulas for
American Wire Gauge. As you might guess, the rated ampacities are just a rule of
thumb. In careful engineering the voltage drop, insulation temperature limit,
thickness, thermal conductivity, and air convection and temperature should all
be taken into account. The Maximum Amps for Power Transmission uses the 700
circular mils per amp rule, which is very very conservative. The Maximum Amps
for Chassis Wiring is also a conservative rating, but is meant for wiring in
air, and not in a bundle. For short lengths of wire, such as is used in battery
packs you should trade off the resistance and load with size, weight, and
flexibility. NOTE: For installations that need to conform to the National
Electrical Code, you must use their guidelines. Contact your local electrician
to find out what is legal!
|
AWG gauge |
Conductor |
Conductor |
Ohms per 1000 ft. |
Ohms per km |
Maximum amps for chassis wiring |
Maximum amps for |
Maximum frequency for |
|
OOOO |
0.46 |
11.684 |
0.049 |
0.16072 |
380 |
302 |
125 Hz |
|
OOO |
0.4096 |
10.40384 |
0.0618 |
0.202704 |
328 |
239 |
160 Hz |
|
OO |
0.3648 |
9.26592 |
0.0779 |
0.255512 |
283 |
190 |
200 Hz |
|
0 |
0.3249 |
8.25246 |
0.0983 |
0.322424 |
245 |
150 |
250 Hz |
|
1 |
0.2893 |
7.34822 |
0.1239 |
0.406392 |
211 |
119 |
325 Hz |
|
2 |
0.2576 |
6.54304 |
0.1563 |
0.512664 |
181 |
94 |
410 Hz |
|
3 |
0.2294 |
5.82676 |
0.197 |
0.64616 |
158 |
75 |
500 Hz |
|
4 |
0.2043 |
5.18922 |
0.2485 |
0.81508 |
135 |
60 |
650 Hz |
|
5 |
0.1819 |
4.62026 |
0.3133 |
1.027624 |
118 |
47 |
810 Hz |
|
6 |
0.162 |
4.1148 |
0.3951 |
1.295928 |
101 |
37 |
1100 Hz |
|
7 |
0.1443 |
3.66522 |
0.4982 |
1.634096 |
89 |
30 |
1300 Hz |
|
8 |
0.1285 |
3.2639 |
0.6282 |
2.060496 |
73 |
24 |
1650 Hz |
|
9 |
0.1144 |
2.90576 |
0.7921 |
2.598088 |
64 |
19 |
2050 Hz |
|
10 |
0.1019 |
2.58826 |
0.9989 |
3.276392 |
55 |
15 |
2600 Hz |
|
11 |
0.0907 |
2.30378 |
1.26 |
4.1328 |
47 |
12 |
3200 Hz |
|
12 |
0.0808 |
2.05232 |
1.588 |
5.20864 |
41 |
9.3 |
4150 Hz |
|
13 |
0.072 |
1.8288 |
2.003 |
6.56984 |
35 |
7.4 |
5300 Hz |
|
14 |
0.0641 |
1.62814 |
2.525 |
8.282 |
32 |
5.9 |
6700 Hz |
|
15 |
0.0571 |
1.45034 |
3.184 |
10.44352 |
28 |
4.7 |
8250 Hz |
|
16 |
0.0508 |
1.29032 |
4.016 |
13.17248 |
22 |
3.7 |
11 k Hz |
|
17 |
0.0453 |
1.15062 |
5.064 |
16.60992 |
19 |
2.9 |
13 k Hz |
|
18 |
0.0403 |
1.02362 |
6.385 |
20.9428 |
16 |
2.3 |
17 kHz |
|
19 |
0.0359 |
0.91186 |
8.051 |
26.40728 |
14 |
1.8 |
21 kHz |
|
20 |
0.032 |
0.8128 |
10.15 |
33.292 |
11 |
1.5 |
27 kHz |
|
21 |
0.0285 |
0.7239 |
12.8 |
41.984 |
9 |
1.2 |
33 kHz |
|
22 |
0.0254 |
0.64516 |
16.14 |
52.9392 |
7 |
0.92 |
42 kHz |
|
23 |
0.0226 |
0.57404 |
20.36 |
66.7808 |
4.7 |
0.729 |
53 kHz |
|
24 |
0.0201 |
0.51054 |
25.67 |
84.1976 |
3.5 |
0.577 |
68 kHz |
|
25 |
0.0179 |
0.45466 |
32.37 |
106.1736 |
2.7 |
0.457 |
85 kHz |
|
26 |
0.0159 |
0.40386 |
40.81 |
133.8568 |
2.2 |
0.361 |
107 kH |
|
27 |
0.0142 |
0.36068 |
51.47 |
168.8216 |
1.7 |
0.288 |
130 kHz |
|
28 |
0.0126 |
0.32004 |
64.9 |
212.872 |
1.4 |
0.226 |
170 kHz |
|
29 |
0.0113 |
0.28702 |
81.83 |
268.4024 |
1.2 |
0.182 |
210 kHz |
|
30 |
0.01 |
0.254 |
103.2 |
338.496 |
0.86 |
0.142 |
270 kHz |
|
31 |
0.0089 |
0.22606 |
130.1 |
426.728 |
0.7 |
0.113 |
340 kHz |
|
32 |
0.008 |
0.2032 |
164.1 |
538.248 |
0.53 |
0.091 |
430 kHz |
|
Metric 2.0 |
0.00787 |
0.200 |
169.39 |
555.61 |
0.51 |
0.088 |
440 kHz |
|
33 |
0.0071 |
0.18034 |
206.9 |
678.632 |
0.43 |
0.072 |
540 kHz |
|
Metric 1.8 |
0.00709 |
0.180 |
207.5 |
680.55 |
0.43 |
0.072 |
540 kHz |
|
34 |
0.0063 |
0.16002 |
260.9 |
855.752 |
0.33 |
0.056 |
690 kHz |
|
Metric 1.6 |
0.0063 |
0.16002 |
260.9 |
855.752 |
0.33 |
0.056 |
690 kHz |
|
35 |
0.0056 |
0.14224 |
329 |
1079.12 |
0.27 |
0.044 |
870 kHz |
|
Metric 1.4 |
.00551 |
.140 |
339 |
1114 |
0.26 |
0.043 |
900 kHz |
|
36 |
0.005 |
0.127 |
414.8 |
1360 |
0.21 |
0.035 |
1100 kHz |
|
Metric 1.25 |
.00492 |
0.125 |
428.2 |
1404 |
0.20 |
0.034 |
1150 kHz |
|
37 |
0.0045 |
0.1143 |
523.1 |
1715 |
0.17 |
0.0289 |
1350 kHz |
|
Metric 1.12 |
.00441 |
0.112 |
533.8 |
1750 |
0.163 |
0.0277 |
1400 kHz |
|
38 |
0.004 |
0.1016 |
659.6 |
2163 |
0.13 |
0.0228 |
1750 kHz |
|
Metric 1 |
.00394 |
0.1000 |
670.2 |
2198 |
0.126 |
0.0225 |
1750 kHz |
|
39 |
0.0035 |
0.0889 |
831.8 |
2728 |
0.11 |
0.0175 |
2250 kHz |
|
40 |
0.0031 |
0.07874 |
1049 |
3440 |
0.09 |
0.0137 |
2900 kHz |
|
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Voltage Drop Calculator by Gerald Newton http://www.electrician2.com
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