WIRE GAUGE CHARTS
4/0 wire in mm
Thickness: 11.68 mm diameter (0.460 inches), 107.22 mm² cross-section of solid copper.
Specifications
- Diameter
- 11.68 mm
- Diameter (imperial)
- 0.460 in
- Cross-section
- 107.22 mm²
- Area (kcmil)
- 211.6
- Copper resistance
- 0.049 Ω/1000 ft
- Copper resistance (metric)
- 0.16 Ω/km
- Copper weight
- 960.7 g/m
- Ampacity (NEC 75 °C)
- 230 A
Nearest metric sizes
107.22 mm² does not match a standard metric cable size exactly. The closest conventional cross-sections are70 mm², 95 mm² and 120 mm²— engineers round this wire up (larger cross-section) for ampacity, or accept the raw equality for signal work.
One gauge away:3/0 · thinnerFull chart →
Frequently asked questions
Is 4/0 gauge wire thick or thin?
4/0 gauge wire is 11.68 mm in diameter. On the AWG scale a lower number means a thicker wire, so 4/0 AWG sits toward the thick end, where service and feeder wires live.
How many amps can 4/0 gauge wire carry?
NEC Table 310.16 rates 4/0 AWG copper at 230 A in the 75 °C column (see our amp chart for 60/75/90 °C ratings). Use the calculator to check voltage drop at your run length; long runs often force one size thicker.
What diameter is 4/0 wire in millimeters?
4/0 gauge wire is 11.68 mm (0.460 in) in diameter, with a solid-conductor cross-section of 107.22 mm².