Wire Size for 30 Amp 300 Feet (120V)
| Standard | Wire Size | Ampacity | Volt Drop | Drop % |
|---|
| NEC (US) | AWG 2 (33.6 mm²) | 115 A | 3.42 V | 2.85% |
| IEC (EU) | 35 mm² | 119 A | 3.29 V | 2.74% |
| BS (UK) | 25 mm² | 101 A | 4.60 V | 3.83% |
| AS/NZS | 25 mm² | 101 A | 4.60 V | 3.83% |
About AWG 2
- Typical use
- 95–115 A feeders — service entrance, heavy commercial loads
- Max breaker
- 115 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 % |
|---|
| 20 A | AWG 3 | 26.7 mm² | 100 A | 2.39% |
| 30 A | AWG 2 | 33.6 mm² | 115 A | 2.85% |
| 40 A | AWG 1/0 | 53.5 mm² | 150 A | 2.39% |
Adjacent Distance Comparison
| Distance | AWG | mm² | Ampacity | Drop % |
|---|
| 200 ft | AWG 3 | 26.7 mm² | 100 A | 2.39% |
| 300 ft | AWG 2 | 33.6 mm² | 115 A | 2.85% |