Wire Size Calculator
Determine the minimum American Wire Gauge (AWG) size required for your circuit to maintain a voltage drop below 3%, ensuring compliance with NEC recommendations.
Circuit Parameters
Common Copper Wire Ampacities (NEC 310.16)
| Wire Size (AWG) | Max Amps (60°C / NM-B) | Max Amps (75°C / THHN) | Typical Use |
|---|---|---|---|
| 14 AWG | 15 A | 20 A | Lighting circuits |
| 12 AWG | 20 A | 25 A | Standard outlets |
| 10 AWG | 30 A | 35 A | Dryers / AC units |
| 8 AWG | 40 A | 50 A | Large appliances |
| 6 AWG | 55 A | 65 A | Subpanels / EV Chargers |
Note: "60°C" column typically applies to standard NM-B (Romex) cable. "75°C" applies to THHN in conduit. Always consult local codes.
Frequently Asked Questions
Frequently Asked Questions
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