Wire Size for 100 Amp 10 Feet (120V)
| Standard | Wire Size | Ampacity | Volt Drop | Drop % |
|---|
| NEC (US) | AWG 3 (26.7 mm²) | 100 A | 0.48 V | 0.40% |
| IEC (EU) | 25 mm² | 101 A | 0.51 V | 0.43% |
| BS (UK) | 25 mm² | 101 A | 0.51 V | 0.43% |
| AS/NZS | 25 mm² | 101 A | 0.51 V | 0.43% |
About AWG 3
- Typical use
- 85–100 A feeders — large sub-panels, commercial branch circuits
- Max breaker
- 100 A
- Temperature rating
- 75 °C
- NEC reference
- NEC Table 310.16
Always verify local code requirements. Wire sizing depends on insulation type, ambient temperature, and conduit fill.
Adjacent Current Comparison
| Current | AWG | mm² | Ampacity | Drop % |
|---|
| 60 A | AWG 6 | 13.3 mm² | 65 A | 0.48% |
| 100 A | AWG 3 | 26.7 mm² | 100 A | 0.40% |
| 150 A | AWG 1/0 | 53.5 mm² | 150 A | 0.30% |
Adjacent Distance Comparison
| Distance | AWG | mm² | Ampacity | Drop % |
|---|
| 10 ft | AWG 3 | 26.7 mm² | 100 A | 0.40% |
| 25 ft | AWG 3 | 26.7 mm² | 100 A | 1.00% |