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2% Wire Loss Chart
In a low voltage system, the maximum voltage drop in the power cables should be less than 2%. For a nominal 12 volt circuit, a 2% loss represents 0.25 volts. This chart estimates the maximum distance of a two conductor copper cable from the power source to the load resulting in a 2% voltage drop.
|
| Wire Size |
| Amps |
#14 |
#12 |
#10 |
#8 |
#6 |
#4 |
| 1 |
45 |
70 |
115 |
180 |
290 |
456 |
| 2 |
22.5 |
35 |
57.5 |
90 |
145 |
228 |
| 4 |
10 |
17.5 |
27.5 |
45 |
72.5 |
114 |
| 6 |
7.5 |
12 |
17.5 |
30 |
47.5 |
75 |
| 8 |
5.5 |
8.5 |
11.5 |
22.5 |
35.5 |
57 |
| 10 |
4.5 |
7 |
11.5 |
18 |
28.5 |
45.5 |
| 15 |
3 |
4.5 |
7 |
12 |
19 |
30 |
| 20 |
2 |
3.5 |
5.5 |
9 |
14.5 |
22.5 |
| 25 |
1.8 |
2.8 |
4.5 |
7 |
11.5 |
18 |
| 30 |
1.5 |
2.4 |
3.5 |
6 |
9.5 |
15 |
| 40 |
|
|
2.8 |
4.5 |
7 |
11.5 |
| 50 |
|
|
2.3 |
3.6 |
5.5 |
9 |
|
