WIRE GAUGE CHARTS
1/0 wire in mm
Thickness: 8.25 mm diameter (0.325 inches), 53.48 mm² cross-section of solid copper.
Specifications
- Diameter
- 8.25 mm
- Diameter (imperial)
- 0.325 in
- Cross-section
- 53.48 mm²
- Area (kcmil)
- 105.5
- Copper resistance
- 0.098 Ω/1000 ft
- Copper resistance (metric)
- 0.32 Ω/km
- Copper weight
- 479.1 g/m
- Ampacity (NEC 75 °C)
- 150 A
Nearest metric sizes
53.48 mm² does not match a standard metric cable size exactly. The closest conventional cross-sections are35 mm², 50 mm² and 70 mm²— engineers round this wire up (larger cross-section) for ampacity, or accept the raw equality for signal work.
One gauge away:1 · thinner2/0 · thickerFull chart →
Frequently asked questions
Is 1/0 gauge wire thick or thin?
1/0 gauge wire is 8.25 mm in diameter. On the AWG scale a lower number means a thicker wire, so 1/0 AWG sits toward the thick end, where service and feeder wires live.
How many amps can 1/0 gauge wire carry?
NEC Table 310.16 rates 1/0 AWG copper at 150 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 1/0 wire in millimeters?
1/0 gauge wire is 8.25 mm (0.325 in) in diameter, with a solid-conductor cross-section of 53.48 mm².