7 AWG wire specifications: 3.6649 mm diameter, 10.5488 mm² area. Resistance, weight, and common uses.
| Diameter | 3.6649 mm · 0.144285" · 144.29 mils |
| Cross-sectional area | 10.5488 mm² · 20,818 circular mils |
| Resistance (copper, 20°C) | 1.6343 Ω/km · 0.4981 Ω/1000ft |
| Resistance (aluminum, 20°C) | 2.5121 Ω/km · 0.7657 Ω/1000ft |
| Ampacity — copper 60°C | — A |
| Ampacity — copper 75°C | — A |
| Ampacity — copper 90°C | — A |
| Ampacity — aluminum 75°C | — A |
| Weight (copper) | 94.517 kg/km · 63.512 lbs/1000ft |
| Weight (aluminum) | 28.482 kg/km · 19.139 lbs/1000ft |
| Closest metric size | 10.5 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 |