Wire Sizing Calculation Method

The wire size for a given ampacity is set in the Wire Sizing command.

The default wire sizes are based upon NEC Table 310.16. The 60°C Copper column is used for wires up to #1. The 75°C Copper column is used for wires 1/0 and larger. These wire sizes are used when the wire size is chosen automatically.

By default, the Aluminum or Copper-Clad Aluminum column sizes are included but are not used for sizing the wires automatically. They can be chosen manually by the user, or added to a custom sizing option for automatic sizing.