12 AWG wire specs

25 A

12 AWG copper at 75 °C · 20 A at 60 °C · 30 A at 90 °C · aluminum 20 A at 75 °C

Voltage drop of 12 AWG copper

One-way	10 A	15 A	20 A	30 A	50 A
25 ft	0.96 V	1.45 V	1.93 V	2.90 V	4.83 V
50 ft	1.93 V	2.90 V	3.86 V	5.79 V	9.65 V
100 ft	3.86 V	5.79 V	7.72 V	11.58 V	19.30 V
150 ft	5.79 V	8.69 V	11.58 V	17.37 V	28.95 V
200 ft	7.72 V	11.58 V	15.44 V	23.16 V	38.60 V

Single-phase, DC resistance 1.93 Ω/1000 ft (Cu) / 3.18 Ω (Al).

How many amps can 12 AWG wire carry?

Copper 12 AWG: 20 A at 60 °C, 25 A at 75 °C, 30 A at 90 °C (breaker limited to 20 A by NEC 240.4(D)).

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