WireSizing
Wire gauge reference & calculator

What Wire Size for 150 Amps?

Copper Wire
2/0 AWG
9.2658 mm · 67.4309 mm²
Aluminum Wire
3/0 AWG
10.4049 mm · 85.0288 mm²
Breaker: 150A · Based on NEC Table 310.16 (75°C insulation)

Common Uses for 150A Circuits

Service entrance, commercial panels

2/0 AWG Copper — Key Specs

Diameter9.2658 mm (0.364797")
Area67.4309 mm²
Resistance at 20°C0.2557 Ω/km
Weight604.181 kg/km
Ampacity (75°C)145 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.

Related

2/0 AWG full specifications → Full AWG chart → Wire size calculator → Ampacity tables →