Wire Sizing Calculation Method

The wire size for a given ampacity is set in the Wire Sizing dialog box. See the Wire Sizing section for more information about setting these values.

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.

The Aluminum or Copper-Clad Aluminum column sizes are included and can be chosen manually by the user. They are not used for sizing the wires automatically.