12 AWG wire specifications: 2.0525 mm diameter, 3.3088 mm² area, 20A ampacity (copper, 75°C). Resistance, weight, and common uses.
| Diameter | 2.0525 mm · 0.080808" · 80.81 mils |
| Cross-sectional area | 3.3088 mm² · 6,530 circular mils |
| Resistance (copper, 20°C) | 5.2104 Ω/km · 1.5881 Ω/1000ft |
| Resistance (aluminum, 20°C) | 8.009 Ω/km · 2.4411 Ω/1000ft |
| Ampacity — copper 60°C | 20 A |
| Ampacity — copper 75°C | 20 A |
| Ampacity — copper 90°C | 30 A |
| Ampacity — aluminum 75°C | 15 A |
| Weight (copper) | 29.647 kg/km · 19.922 lbs/1000ft |
| Weight (aluminum) | 8.934 kg/km · 6.003 lbs/1000ft |
| Closest metric size | 3.3 mm² |
| Skin depth at 60 Hz | 8.531 mm |
| Type | Temperature | Description |
|---|---|---|
| THHN/THWN-2 | 90°C dry / 75°C wet | Building wire |
| NM-B (Romex) | 90°C | Residential cable |
| MTW | 60/90°C | Machine tool wire |
| TFFN | 90°C | Fixture wire |