Wire and breaker sizing | WireAndWidgets

Copper conductor, breaker, and equipment ground sizing, with optional voltage drop. Results update as you type. Conductor reference

Size wire for a load Check a wire size

Circuit

Load current A System Where is the wire? Panel wiring table Temperature column Defaults: 75°C in the panel, 60°C in the field. Parallel sets

Motor or continuous load Sizes the wire and breaker at 125% of the load.

Current-carrying conductors together

One-way distance ft System voltage V

Enter a distance to check voltage drop.