Wire Sizes

Wires sizes are expressed is a few different ways. In the USA, AWG (American Wire Gauge) is most common. In Australia, CSA (Cross Sectional Area) is the most often used term.

The CSA is calculated as: Number of strands * Pi * (Strand radius squared)

For example, a 24/0.2 cable is: 24 * Pi * (0.1 * 0.1) which gives approx 0.754 sq mm CSA.

Comparison Chart

The "Metric Strands" column lists common wire sizes found in Australia.

Use the "Resistance" column figures in conjunction with the Ohms Law page to help determine how much voltage drop you'll get in your situation.

Please note that the "Rating (Amps)" figures are a guide only, and may need de-rating when cables are bundled together, enclosed in conduit or subject to high ambient temperatures.

AWGCSA (sq mm)Metric StandsResistanceRating (Amps)
(Ω/km)(Ω/kFT)
142.4
233.6
326.70.64650.1970
25.7364/0.3200
421.20.81520.2485
516.8
613.31.2960.3951
710.5
88.372.0610.6282
96.63
7.1630/0.1261
105.263.2770.9989
114.17
123.315.2111.588
132.4550/0.256.5712.00322
2.390/0.1820
142.088.2862.525
151.65
161.3113.174.016
171.0432/0.216.615.06410
180.82320.956.385
0.75424/0.27.5
190.65326.428.051
200.51816/0.2 or 20/0.1833.3110.155
0.4414/0.24.5
210.41
220.32652.9616.14
230.258
0.227/0.22.2
0.21514/0.142
240.20584.2225.67
250.162
0.147/0.161.5
260.1297/0.15133.940.81
270.102
280.087/0.12212.964.9

Calculators

References

Categories: Wiring pages

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