Find the correct AWG wire gauge for your electrical circuit. Based on load current, run length, and NEC ampacity tables.
10 AWG — 30A max
| Recommended Gauge | 10 AWG |
| Ampacity | 30A |
| Voltage Drop | 2.49 V |
| Drop Percentage | 2.07% |
| Conductor | Copper |
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Wire selected from NEC ampacity tables
Voltage drop check: VD = (2 × K × I × L) / CM ≤ 3%
For a 20-amp circuit, use 12 AWG copper wire (minimum). For longer runs, consider 10 AWG to reduce voltage drop.
30-amp circuits require 10 AWG copper wire minimum per NEC 310.12.
AWG stands for American Wire Gauge. Lower AWG numbers = thicker wire. 14 AWG is thinner than 10 AWG.
Yes, aluminum is cheaper but requires larger gauge (2 sizes up from copper) and proper anti-oxidant compound on connections.
Calculations are for educational purposes only. Consult a qualified financial advisor for personalized advice.