9 AWG wire specifications: 2.9064 mm diameter, 6.6342 mm² area. Resistance, weight, and common uses.
| Diameter | 2.9064 mm · 0.114424" · 114.42 mils |
| Cross-sectional area | 6.6342 mm² · 13,093 circular mils |
| Resistance (copper, 20°C) | 2.5987 Ω/km · 0.7921 Ω/1000ft |
| Resistance (aluminum, 20°C) | 3.9945 Ω/km · 1.2175 Ω/1000ft |
| Ampacity — copper 60°C | — A |
| Ampacity — copper 75°C | — A |
| Ampacity — copper 90°C | — A |
| Ampacity — aluminum 75°C | — A |
| Weight (copper) | 59.442 kg/km · 39.943 lbs/1000ft |
| Weight (aluminum) | 17.912 kg/km · 12.037 lbs/1000ft |
| Closest metric size | 6.6 mm² |
| Skin depth at 60 Hz | 8.531 mm |
| Type | Temperature | Description |
|---|---|---|
| THHN/THWN-2 | 90°C dry / 75°C wet | Most common for building wire |
| XHHW-2 | 90°C dry and wet | Cross-linked polyethylene, moisture resistant |
| USE-2 | 90°C | Underground service entrance |
| NM-B (Romex) | 90°C | Non-metallic sheathed cable for residential |
| UF-B | 60°C | Underground feeder, direct burial |