Wire gauge by amps and length

RV Wire Gauge by Current and Run Length

Pick the current and the one-way run length. Each page gives the conductor size for both the 3 percent and 10 percent voltage drop limits, how it changes with distance, and the fuse that belongs with it.

36 pages in this section.

10A at 5 ft

Carrying 10 amps over a 5 foot 12V run needs 14 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
10A at 10 ft

Carrying 10 amps over a 10 foot 12V run needs 10 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fu
10A at 15 ft

Carrying 10 amps over a 15 foot 12V run needs 8 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
10A at 25 ft

Carrying 10 amps over a 25 foot 12V run needs 6 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
20A at 5 ft

Carrying 20 amps over a 5 foot 12V run needs 10 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
20A at 10 ft

Carrying 20 amps over a 10 foot 12V run needs 8 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
20A at 15 ft

Carrying 20 amps over a 15 foot 12V run needs 6 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
20A at 25 ft

Carrying 20 amps over a 25 foot 12V run needs 4 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
30A at 5 ft

Carrying 30 amps over a 5 foot 12V run needs 8 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fuse
30A at 10 ft

Carrying 30 amps over a 10 foot 12V run needs 6 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
30A at 15 ft

Carrying 30 amps over a 15 foot 12V run needs 4 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
30A at 25 ft

Carrying 30 amps over a 25 foot 12V run needs 2 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
40A at 5 ft

Carrying 40 amps over a 5 foot 12V run needs 8 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fuse
40A at 10 ft

Carrying 40 amps over a 10 foot 12V run needs 4 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
40A at 15 ft

Carrying 40 amps over a 15 foot 12V run needs 2 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
40A at 25 ft

Carrying 40 amps over a 25 foot 12V run needs 1 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
50A at 5 ft

Carrying 50 amps over a 5 foot 12V run needs 6 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fuse
50A at 10 ft

Carrying 50 amps over a 10 foot 12V run needs 4 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
50A at 15 ft

Carrying 50 amps over a 15 foot 12V run needs 2 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
50A at 25 ft

Carrying 50 amps over a 25 foot 12V run needs 1/0 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and f
60A at 5 ft

Carrying 60 amps over a 5 foot 12V run needs 6 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fuse
60A at 10 ft

Carrying 60 amps over a 10 foot 12V run needs 2 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
60A at 15 ft

Carrying 60 amps over a 15 foot 12V run needs 2 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
60A at 25 ft

Carrying 60 amps over a 25 foot 12V run needs 2/0 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and f
80A at 5 ft

Carrying 80 amps over a 5 foot 12V run needs 4 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fuse
80A at 10 ft

Carrying 80 amps over a 10 foot 12V run needs 2 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
80A at 15 ft

Carrying 80 amps over a 15 foot 12V run needs 1/0 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and f
80A at 25 ft

Carrying 80 amps over a 25 foot 12V run needs 3/0 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and f
100A at 5 ft

Carrying 100 amps over a 5 foot 12V run needs 4 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
100A at 10 ft

Carrying 100 amps over a 10 foot 12V run needs 1 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fu
100A at 15 ft

Carrying 100 amps over a 15 foot 12V run needs 2/0 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and
100A at 25 ft

Carrying 100 amps over a 25 foot 12V run needs 4/0 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and
150A at 5 ft

Carrying 150 amps over a 5 foot 12V run needs 2 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and fus
150A at 10 ft

Carrying 150 amps over a 10 foot 12V run needs 2/0 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and
150A at 15 ft

Carrying 150 amps over a 15 foot 12V run needs 3/0 AWG copper to stay within a 3 percent voltage drop. Ampacity, voltage drop and
150A at 25 ft

Carrying 150 amps over a 25 foot 12V run needs more than 4/0 copper to stay within a 3 percent voltage drop. Ampacity, voltage dro