Power Cable Gauge Guide
You should use 4 AWG (21.1 mm
2
) wire for most installations. If your total amperage is higher than 50–65 A,
and your cable run is longer than 10–13 ft (3–4 m), you can use these tables to determine if you need to use a
larger gauge of wire. This table accounts for terminal connection resistance.
NOTE: If you are using aluminum wire, you should use a wire two gauges larger than the gauge listed below to
compensate for a potential voltage drop due to the wire material.
Total Amperage
0––4 ft.
(0–1.2 m)
4–7 ft.
(1.2–2.1 m)
7–10 ft.
(2.1–3 m)
10–13 ft.
(3–4 m)
85–105 A
4 AWG
(21.1 mm
2
)
4 AWG
(21.1 mm
2
)
4 AWG
(21.1 mm
2
)
2 AWG
(33.6 mm
2
)
105–125 A
4 AWG
(21.1 mm
2
)
4 AWG
(21.1 mm
2
)
4 AWG
(21.1 mm
2
)
2 AWG
(33.6 mm
2
)
125–150 A
2 AWG
(33.6 mm
2
)
2 AWG
(33.6 mm
2
)
2 AWG
(33.6 mm
2
)
0 AWG
(53.5 mm
2
)
Total Amperage
13–16 ft.
(4–4.9 m)
16–19 ft.
(4.9–5.8 m)
19–22 ft.
(5.8–6.7 m)
22–28 ft.
(6.7–8.5 m)
50–65 A
4 AWG
(21.1 mm
2
)
4 AWG
(21.1 mm
2
)
4 AWG
(21.1 mm
2
)
2 AWG
(33.6 mm
2
)
65–85 A
2 AWG
(33.6 mm
2
)
2 AWG
(33.6 mm
2
)
2 AWG
(33.6 mm
2
)
0 AWG
(53.5 mm
2
)
85–105 A
2 AWG
(33.6 mm
2
)
2 AWG
(33.6 mm
2
)
2 AWG
(33.6 mm
2
)
0 AWG
(53.5 mm
2
)
105–125 A
0 AWG
(53.5 mm
2
)
0 AWG
(53.5 mm
2
)
0 AWG
(53.5 mm
2
)
0 AWG
(53.5 mm
2
)
125–150 A
0 AWG
(53.5 mm
2
)
0 AWG
(53.5 mm
2
)
0 AWG
(53.5 mm
2
)
0 AWG
(53.5 mm
2
)
6
