Ampacity of Different Gauges of Wire

Here are the ampacity ratings for a wide range of American wire gauges (AWG) at a temperature of 60°C (140°F) in free air:

• 22 AWG: 3 Amps
• 20 AWG: 5 Amps
• 18 AWG: 16 Amps
• 16 AWG: 25 Amps
• 14 AWG: 40 Amps
• 12 AWG: 55 Amps
• 10 AWG: 70 Amps
• 8 AWG: 85 Amps
• 6 AWG: 95 Amps
• 4 AWG: 115 Amps
• 2 AWG: 130 Amps
• 1/0 AWG: 145 Amps
• 2/0 AWG: 160 Amps
• 3/0 AWG: 185 Amps
• 4/0 AWG: 205 Amps

Note that these ratings are for single-conductor wires in free air, and the ampacity of a wire can be reduced by as much as 50% or more when multiple wires are bundled together or when the wire is run in conduit or through a wall. Also, the ampacity of a wire can be increased by using larger wire gauges, lower ambient temperatures, or better cooling methods.

These ampacity ratings should be used as a general guideline and always consult the manufacturer’s specifications for the specific wire being used.