Jekyll2024-11-18T21:19:54+00:00https://11110100.xyz/feed.xml0xF4A kinda anonymous blog. The title "0xF4" is named after the domain, which I got because it costs a grand total of 67 cents a year.0xF40b11110100@gmail.comChoosing wire sizes with SAE AS508812024-11-18T19:26:00+00:002024-11-18T19:26:00+00:00https://11110100.xyz/electronics/2024/11/18/wiresize
Material Wire size Max temp. rise (°C) Max wire temp minus max ambient temp # in bundle # carrying current Single wire ampacity Total ampacity
0.0 A 0.0 A

Explanation

I based this calculator off of SAE AS50881, which is a standard for wiring in aerospace vehicles. Among other things, it includes a process for wire sizing based of off how many wires are in the bundle and how many are carrying current.

Per the standard, these calculations only work for frequencies up to 800Hz. Above 800 Hz, skin effect and proximity effects become significant.

In reality, the numbers given here are probably only accurate to the standard by ~5%. The AS50881 standard has some information that is only available through graphs, and it doesn't give the equations, so I've had to reverse-engineer the equations behind the standard.

I've tried to make this reasonably accurate though; let me know if you find anything wrong. If you're designing something serious, you might want to double check with the actual standard, not this random calculator you found on the internet.

]]>0xF40b11110100@gmail.comActually correct wire gauge conversions2024-11-18T05:43:26+00:002024-11-18T05:43:26+00:00https://11110100.xyz/electronics/2024/11/18/wiregauge

AWG to mm²

AWG mm²
36 0.013
34 0.020
32 0.032
30 0.051
28 0.081
26 0.129
24 0.205
22 0.326
20 0.518
18 0.823
16 1.309
14 2.081
12 3.309
10 5.261
8 8.366
6 13.302
4 21.151
2 33.361
1 42.408
1/0 53.475
2/0 67.431
3/0 85.029
4/0 107.219

mm² to AWG

mm² AWG
0.13 25.959
0.25 23.139
0.35 21.687
0.5 20.149
0.75 18.401
1 17.160
1.2 16.374
1.5 15.412
1.75 14.747
2 14.171
2.5 13.209
4 11.182
6 9.433
8 8.193
10 7.230
12 6.444
16 5.204
25 3.279
35 1.828
50 0.710/0
70 2.161/0
95 3.478/0
120 4.486/0

Explanation

A lot of wire size conversion tables out there are completely incorrect. Many label 1 AWG as 50 mm², even though it's not even close to that. This page uses the actual equations to give the correct conversions.

Here's how it works: solid 36 AWG wire is defined as 0.005 inches in diameter, and solid 4/0 wire is defined as 0.46 inches in diameter. A smaller gauge number increases the wire diameter by a constant factor. This leads to the following equation, where d is the diameter of the wire, and n is the wire gauge in AWG:

Using the formula for a circle's area, we get the following equation, where A is the cross-sectional area in mm²:

To convert from mm² to AWG, we can just invert the equation:

Solid and stranded wires of the same gauge have the same cross-sectional area, so these conversions work with both solid and stranded wire.

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