Wire Ampacity Chart

Determine the maximum safe current a wire can carry based on conductor material, size, and temperature rating. We don't apply derating factors here.

Conductor Material

Temperature Rating

Ambient Temp

Raceway Conductors

Rule 8-104

AWG / Kcmil Size

Pro Tip: 75°C vs 90°C

Even if you use 90°C wire (like THHN), you typically must terminate it using the 75°C capacity column because most standard breakers are only rated for 75°C connections.

Base Ampacity

At 75°C (Copper)

Derating Sequence

▶Base Ampacity (Table 2 @ 75°C): 0A

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