NEC Wire Size & Ampacity Calculator (Table 310.16)

Match circuit amperage to Copper or Aluminum AWG wire gauge with automatic 125% continuous-load sizing and conduit bundle derating.

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2. NEC Wire Size & Ampacity Calculator (Table 310.16)

Load Current (Amps)

Conductor Metal

Terminal Temp Rating

Conductors in Raceway

Continuous Load (runs 3+ hours continuously — apply NEC 125% rule)