1 AWG Wire Ampacity & Specifications
1 AWG copper wire carries 130A at 75°C (NEC Table 310.16), or 100A for aluminum; copper is typically protected by a 125A breaker.
Calculations are built on the 2023 National Electrical Code (NEC) and cross-checked against the published code tables. How we verify. Last updated June 2026.
1 AWG wire has an ampacity of 130A at 75°C for copper and 100A for aluminum (NEC Table 310.16). Its 60°C and 90°C copper ratings are 110A and 145A. Copper 1 AWG is commonly protected by a 125A breaker.
Copper 75°C
130A
Copper 90°C
145A
Aluminum 75°C
100A
Copper breaker (75°C)
125A
1 AWG Wire Specifications
| Ampacity — Copper (60 / 75 / 90°C) | 110 / 130 / 145 A |
| Ampacity — Aluminum (60 / 75 / 90°C) | 85 / 100 / 115 A |
| Cross-section | 83,690 circular mils |
| DC resistance — Copper | 0.154 Ω / 1000 ft |
| DC resistance — Aluminum | 0.253 Ω / 1000 ft |
| Typical voltage drop (240V) | 0.8% at 50 ft · 1.6% at 100 ft (at 125A) |
Common Uses for 1 AWG Wire
- 110–130A feeders
- 125A sub-panels
Ampacities are from NEC Table 310.16. Copper 14, 12 and 10 AWG are limited to 15A, 20A and 30A overcurrent protection, aluminum 12 and 10 AWG to 15A and 25A (240.4(D)). Terminations rated 60°C or 75°C usually cap the usable ampacity below the 90°C value.
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