Wire Size for 20 Amp 50 Feet (120V)
| Standard | Wire Size | Ampacity | Volt Drop | Drop % |
|---|
| NEC (US) | AWG 10 (5.26 mm²) | 35 A | 2.43 V | 2.02% |
| IEC (EU) | 4 mm² | 32 A | 3.20 V | 2.66% |
| BS (UK) | 2.5 mm² | 24 A | 5.11 V | 4.26% |
| AS/NZS | 2.5 mm² | 24 A | 5.11 V | 4.26% |
About AWG 10
- Typical use
- 30 A circuits — clothes dryers, window A/C units, water heaters
- Max breaker
- 30 A
- Temperature rating
- 60 °C
- NEC reference
- NEC 240.4(D)(1)
Always verify local code requirements. Wire sizing depends on insulation type, ambient temperature, and conduit fill.
Adjacent Current Comparison
| Current | AWG | mm² | Ampacity | Drop % |
|---|
| 15 A | AWG 12 | 3.31 mm² | 25 A | 2.41% |
| 20 A | AWG 10 | 5.26 mm² | 35 A | 2.02% |
| 30 A | AWG 8 | 8.37 mm² | 50 A | 1.91% |
Adjacent Distance Comparison
| Distance | AWG | mm² | Ampacity | Drop % |
|---|
| 25 ft | AWG 14 | 2.08 mm² | 20 A | 2.56% |
| 50 ft | AWG 10 | 5.26 mm² | 35 A | 2.02% |
| 75 ft | AWG 8 | 8.37 mm² | 50 A | 1.91% |