What Size Wire for 50 Amps? Complete Guide
Wire Size for 50 Amps
| Wire Material | Size (Standard) | Size (Continuous Load) | Ampacity |
|---|---|---|---|
| Copper (60°C) | 6 AWG | 4 AWG | 55A / 70A |
| Copper (75°C) | 6 AWG | 4 AWG | 65A / 85A |
| Aluminum (60°C) | 4 AWG | 2 AWG | 55A / 75A |
| Aluminum (75°C) | 4 AWG | 2 AWG | 65A / 90A |
Frequently Asked Questions
What size wire for 50 amps?
6 AWG copper wire is rated for 55 amps at 60°C (NEC Table 310.16), suitable for 50-amp breakers. For continuous loads: 50A × 1.25 = 62.5A → use 4 AWG copper (70A rated).
Can I use 8 AWG wire on a 50 amp breaker?
No. 8 AWG is rated for only 40 amps. Using it on a 50-amp breaker violates NEC 240.4. Use 6 AWG minimum for 50 amps.
What uses a 50 amp circuit?
50-amp circuits are used for: electric ranges/ovens, large AC units (4-5 ton), hot tubs, RV hookups, and EV chargers. Most require 240V with 6 AWG copper wire.
Disclaimer: For preliminary design only. Verify against local codes and professional engineering requirements.