Selecting The Proper Wire For The Job

Standard

Alright, here’s the deal. I have put all of my info in order to get the right size wire to do the job here. You can decide by power, by load, by application, whatever. This should get you pointed in the right direction. This section is by load.

WIRE GAUGE SELECTION TABLE

Amps Watts Wire gauge (for length in feet)
6V 12V 6V 12V 3 5 7 10 15 20 25
0 to 2.5 0 to 5 15 30 18 18 18 18 18 18 18
3.0 6 18 36 18 18 18 18 18 18 16
3.5 7 21 42 18 18 18 18 18 18 16
4.0 8 24 48 18 18 18 18 18 16 16
5.0 10 30 60 18 18 18 18 16 16 16
5.5 11 33 66 18 18 18 18 16 16 14
6.0 12 36 72 18 18 18 18 16 16 14
7.5 15 45 90 18 18 18 18 14 14 12
9.0 18 54 108 18 18 16 16 14 14 12
10 20 60 120 18 18 16 16 14 12 10
11 22 66 132 18 18 16 16 12 12 10
12 24 72 144 18 18 16 16 12 12 10
15 30 90 180 18 16 16 14 10 10 10
20 40 120 240 18 16 14 12 10 10 8
25 50 150 300 16 14 12 12 10 10 8
50 100 300 600 12 12 10 10 6 6 4
75 150 450 900 10 10 8 8 4 4 2
100 200 600 1200 10 8 8 6 4 4 2

Wire Gauge Selection Adjustments

(1) For very long cables ( for example: 20 foot long battery cables to relocate your battery ) go one size larger.

(2) You can probably get by using a size or maybe even 2 sizes smaller than the chart recommends. The factory makes the cables as small as possible but can still get the job done. Copper is expensive… the manufacturer saves a few bucks on millions of cars… pretty soon it adds up to real money. Using cable larger than the factory cable they will work better for you than the original.

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