WireSizing
Wire gauge reference & calculator

What Wire Size for 30 Amps?

Copper Wire
10 AWG
2.5882 mm · 5.2612 mm²
Aluminum Wire
8 AWG
3.2636 mm · 8.3656 mm²
Breaker: 30A · Based on NEC Table 310.16 (75°C insulation)

Common Uses for 30A Circuits

Dryers, water heaters, small AC units

10 AWG Copper — Key Specs

Diameter2.5882 mm (0.101897")
Area5.2612 mm²
Resistance at 20°C3.2768 Ω/km
Weight47.14 kg/km
Ampacity (75°C)30 A

Important: For long wire runs, you may need to upsize the wire to compensate for voltage drop. NEC recommends keeping voltage drop under 3% for branch circuits. Use our voltage drop calculator to check.

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10 AWG full specifications → Full AWG chart → Wire size calculator → Ampacity tables →