NEC-reference grade
Instantly size conductors for DC, single-phase, and three-phase AC circuits. Computes the minimum AWG by both ampacity and voltage drop, picks the governing constraint, and flags when no listed conductor meets your target.
| Size (AWG) | Area (kcmil) | Resistance (Ω/kft) | Copper Ampacity (A) | Aluminum Ampacity (A) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Cu | Al | 60 °C | 75 °C | 90 °C | 60 °C | 75 °C | 90 °C | ||
| 14 | 4.11 | 3.0700 | 5.0600 | 15 | 15 | 25 | — | — | — |
| 12 | 6.53 | 1.9300 | 3.1800 | 20 | 25 | 30 | 15 | 20 | 25 |
| 10 | 10.38 | 1.2100 | 2.0000 | 30 | 35 | 40 | 25 | 30 | 35 |
| 8 | 16.51 | 0.7640 | 1.2600 | 40 | 50 | 55 | 30 | 40 | 45 |
| 6 | 26.24 | 0.4910 | 0.8080 | 55 | 65 | 75 | 40 | 50 | 55 |
| 4 | 41.74 | 0.3080 | 0.5080 | 70 | 85 | 95 | 55 | 65 | 75 |
| 3 | 52.62 | 0.2450 | 0.4030 | 85 | 100 | 110 | 65 | 75 | 85 |
| 2 | 66.36 | 0.1940 | 0.3190 | 95 | 115 | 130 | 75 | 90 | 100 |
| 1 | 83.69 | 0.1540 | 0.2530 | 110 | 130 | 145 | 85 | 100 | 115 |
| 1/0 | 105.60 | 0.1220 | 0.2010 | 125 | 150 | 170 | 100 | 120 | 135 |
| 2/0 | 133.10 | 0.0967 | 0.1590 | 145 | 175 | 195 | 115 | 135 | 150 |
| 3/0 | 167.80 | 0.0766 | 0.1260 | 165 | 200 | 225 | 130 | 155 | 175 |
| 4/0 | 211.60 | 0.0608 | 0.1000 | 195 | 230 | 260 | 150 | 180 | 205 |