Cables

Reading time : 2 minutes
Published on 16 Apr 2020 - Updated on 25 Jun 2020

This page group information about wires and cables to help to choose correct diameter

When choosing power supply cables, most important parameter is wire diameter or section. It allows to know the maximum rated current and also to estimate voltage loss depending on wire length.
The gauge is a number between AWG0000 and AWG36.
Lower number means higher wire diameter (0000 is the thickest).
There are 39 standards gauges.

$$d = 0.127 \times 92 ^ {\frac{36-n}{39}}$$

with :

  • \( d \) wire diameter in mm
  • \( n \) Cable AWG gauge

Gauges table

AWGDiameter (mm)Section (mm²)Resistivity at 20°C (Ohm/km)Resistivity at 60°C (Ohm/km)Free air maximum current (A)Casing maximum current (A)
320.20.031538.4654.60.530.32
300.250.049338.6411.70.860.52
280.320.080212.9258.91.40.83
260.400.126133.9162.82.21.3
240.510.20484.22102.43.52.1
220.640.32252.9564.407.05.0
200.810.51533.3040.5011.07.5
181.020.81720.9525.471610
161.291.30613.1816.022213
141.632.0868.28410.083217
122.053.2995.2106.3364123
102.595.2663.9854.8455533
83.268.3433.2743.9817346
64.1213.3251.2961.57610160
45.1921.1450.81360.99113580
26.5433.5760.51180.623181100
17.3542.4080.40350.494211125
08.2553.4290.32250.392245150
009.2767.4570.25560.311283175
00010.4084.9060.20280.247328200
000011.68107.0920.16080.196380225