The minimum size circuit conductors permitted for a 115/230-V 1Ø 3 hp motor are how many AWG?

The correct choice reflects the minimum size circuit conductors required for a 115/230-V single-phase, 3 horsepower (hp) motor, which is dictated by the National Electrical Code (NEC) and specific calculations regarding maximum current draw and motor load.

For a 3 hp motor, the maximum current can be determined from the motor's full-load amperage (FLA) ratings, which typically indicate that at 230 volts, a 3 hp motor will have a full-load current of around 13 amps. The NEC allows for certain adjustments and considers factors like installation conditions, conductor material (copper or aluminum), and ambient temperature.

Based on the calculations and NEC guidelines for the sized conductor, a minimum of 8 AWG copper conductors is required to ensure safe and efficient operation. Using 8 AWG wire allows for appropriate current-carrying capacity, minimizes voltage drop, and contributes to the overall safety of the electrical installation. Thus, the choice of 8 AWG aligns with the established electrical code requirements for such motor installations.

By selecting 8 AWG as the answer, it demonstrates an understanding of not only the minimum conductor sizing but also compliance with established electrical safety standards.