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The common US wire gauges - CABLE AWG gauges and current ratings
The AWG - American Wire Gauge - is used as a standard method of denoting wire diameter, measuring the diameter of the conductor (the bare wire) with the insulation removed. AWG is sometimes also known as Brown and Sharpe (B&S) Wire Gauge.
The AWG table below is for a single, solid, round conductor. Because of the small gaps between the strands in a stranded wire, a stranded wire with the same current-carrying capacity and electrical resistance as a solid wire, always have a slightly larger overall diameter.
The higher the number - the thinner the wire. Typical household wiring is AWG number 12 or 14. For telephone wires there are common with AWG 22, 24, or 26.
Th etable below indicates current ratings PVC-insulated single and multicore wiring cables. Always check manufactures data before detailed engineering.
AWG |
Diameter (mm) |
Diameter (in) |
Square (mm2) |
Resistance (ohm/1000m) |
Current Load Ratings (amps)1) | |||||
---|---|---|---|---|---|---|---|---|---|---|
Single Core | Multicore | |||||||||
up to 3 cores | 4 - 6 cores | 7 - 24 cores | 25 - 42 cores | 43 and above | ||||||
40 | 0.08 | . | 0.0050 | 3420 | ||||||
39 | 0.09 | . | 0.0064 | 2700 | ||||||
38 | 0.10 | 0.0040 | 0.0078 | 2190 | ||||||
37 | 0.11 | 0.0045 | 0.0095 | 1810 | ||||||
36 | 0.13 | 0.005 | 0.013 | 1300 | ||||||
35 | 0.14 | 0.0056 | 0.015 | 1120 | ||||||
34 | 0.16 | 0.0063 | 0.020 | 844 | ||||||
33 | 0.18 | 0.0071 | 0.026 | 676 | ||||||
32 | 0.20 | 0.008 | 0.031 | 547 | ||||||
30 | 0.25 | 0.01 | 0.049 | 351 | ||||||
28 | 0.33 | 0.013 | 0.08 | 232.0 | ||||||
27 | 0.36 | 0.014 | 0.096 | 178 | ||||||
26 | 0.41 | 0.016 | 0.13 | 137 | ||||||
25 | 0.45 | 0.018 | 0.16 | 108 | ||||||
24 | 0.51 | 0.02 | 0.20 | 87.5 | 3.5 | 2 | 1.6 | 1.4 | 1.2 | 1 |
22 | 0.64 | 0.025 | 0.33 | 51.7 | 5.0 | 3 | 2.4 | 2.1 | 1.8 | 1.5 |
20 | 0.81 | 0.032 | 0.50 | 34.1 | 6.0 | 5 | 4 | 3.5 | 3 | 2.5 |
18 | 1.02 | 0.04 | 0.82 | 21.9 | 9.5 | 7 | 5.6 | 4.9 | 4.2 | 3.5 |
16 | 1.29 | 0.051 | 1.3 | 13.0 | 20 | 10 | 8 | 7 | 6 | 5 |
14 | 1.63 | 0.064 | 2.0 | 8.54 | 24 | 15 | 12 | 10.5 | 9 | 7.5 |
13 | 1.80 | 0.072 | 2.6 | 6.76 | ||||||
12 | 2.05 | 0.081 | 3.3 | 5.4 | 34 | 20 | 16 | 14 | 12 | 10 |
10 | 2.59 | 0.10 | 5.26 | 3.4 | 52 | 30 | 24 | 21 | 18 | 15 |
8 | 3.25 | 0.13 | 8.30 | 2.2 | 75 | 40 | 32 | 28 | 24 | 20 |
6 | 4.115 | 0.17 | 13.30 | 1.5 | 95 | 55 | 44 | 38 | 33 | 27 |
4 | 5.189 | 0.20 | 21.15 | 0.8 | 120 | 70 | 56 | 49 | 42 | 35 |
3 | 26.65 | 154 | 80 | 64 | 56 | 48 | 40 | |||
2 | 6.543 | 0.26 | 33.62 | 0.5 | 170 | 95 | 76 | 66 | 57 | 57 |
1 | 7.348 | 0.29 | 42.41 | 0.4 | 180 | 110 | 88 | 77 | 66 | 55 |
0 (1/0) | 8.252 | 0.33 | 53.49 | 0.31 | 200 | |||||
00 (2/0) | 9.266 | 0.37 | 67.43 | 0.25 | 225 | |||||
000 (3/0) | 10.40 | 0.41 | 85.01 | 0.2 | 275 | |||||
0000 (4/0) | 11.684 | 0.46 | 107.22 | 0.16 | 325 | |||||
250 | 127 | 345 | ||||||||
300 | 152 | 390 | ||||||||
400 | 178 | 415 |
1) PVC-insulated single and multicore wiring cables, ambient temperature up to 30oC
The higher the gauge number, the smaller the diameter, and the thinner the wire.
Because of less electrical resistance a thick wire will carry more current with less voltage drop than a thin wire. For a long distance it may be necessary to increase the wire diameter - reducing the gauge - to limit the voltage drop.
Correction-factors at ambient temperature above 30oC
ambient temperature 31 - 40 oC: correction factor = 0.82
ambient temperature 41 - 45 oC: correction factor = 0.71
ambient temperature 45 - 50 oC: correction factor = 0.58
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