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Wire Gauge Tables

Observe Proper Wire Size

The most important wiring practice is to observe proper wire size. Failure to use adequate size can result in fire. Even if fire doesn't result, wires that are too small will cause marginal performance of electrical equipment.



  Distance - Feet
  10 15 20 25 30 40 50
Amps Wire Gauge
5 18 16 14 12 12 10 10
10 14 12 10 10 10 8 6
15 12 10 10 8 8 6 6
20 10 10 8 6 6 6 4
25 10 8 6 6 6 4 4
30 10 8 6 6 4 4 2
40 8 6 6 4 4 2 2
50 6 6 4 4 2 2 1
60 6 4 4 2 2 1 0
70 6 4 2 2 1 0 2/0
80 6 4 2 2 1 0 3/0
90 4 2 2 1 0 2/0 3/0
100 4 2 2 1 0 2/0 3/0
120 4 2 1 0 2/0 3/0 4/0
140 2 2 0 2/0 2/0 4/0 4/0
160 2 1 0 2/0 3/0 4/0 4/0+4
180 2 1 2/0 3/0 3/0 4/0+10 4/0+2
200 2 0 2/0 3/0 4/0 4/0+4 4/0+0

Using the Table

The table shows the wire size required for a 3% voltage drop in 12 Volt circuits. To use the table, first calculate the total length of the wire from the source to the device and back again. Next, determine the amount of current in the wire. The wire gauge is found at the intersection of Amps and Feet. In most load circuits, a 3% drop is quite acceptable. In charging circuits it often pays to have less of a drop. Always use one size bigger if practical.



AWG/MM Size Conversion
AWG MM - AWG MM
26 .12826   11 4.156
25 .162   10 6.271
24 .205   9 6.626
23 .255   8 8.350
22 .322   7 10.544
21 .411   6 13.292
20 .516   5 16.755
19 .653   4 21.137
18 .823   3 26.653
17 1.039   2 33.606
16 1.308   1 42.384
15 1.652   0 53.454
14 2.088   00 67.399
13 2.629   000 84.004
12 3.302   0000 104.091