Wire Size for 100 Amp 100 Feet (120V)
| Standard | Wire Size | Ampacity | Volt Drop | Drop % |
|---|
| NEC (US) | AWG 1 (42.4 mm²) | 130 A | 3.01 V | 2.51% |
| IEC (EU) | 50 mm² | 144 A | 2.56 V | 2.13% |
| BS (UK) | 25 mm² | 101 A | 5.11 V | 4.26% |
| AS/NZS | 25 mm² | 101 A | 5.11 V | 4.26% |
About AWG 1
- Typical use
- 110–130 A feeders — service entrance conductors
- Max breaker
- 130 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 3 | 26.7 mm² | 100 A | 2.39% |
| 100 A | AWG 1 | 42.4 mm² | 130 A | 2.51% |
| 150 A | AWG 1/0 | 53.5 mm² | 150 A | 2.99% |
Adjacent Distance Comparison
| Distance | AWG | mm² | Ampacity | Drop % |
|---|
| 75 ft | AWG 3 | 26.7 mm² | 100 A | 2.99% |
| 100 ft | AWG 1 | 42.4 mm² | 130 A | 2.51% |
| 150 ft | AWG 1/0 | 53.5 mm² | 150 A | 2.99% |