What is the minimum wire size recommended for supplying power to a 1 HP motor?

For supplying power to a 1 HP motor, the minimum recommended wire size is typically #12 AWG. This is based on the National Electrical Code (NEC) guidelines, which consider factors such as the current draw of the motor, the distance of the run, and the allowable voltage drop. A 1 HP motor generally operates at about 13 to 15 amps at 120 volts or around 8 to 10 amps at 240 volts.

Using #12 wire is advisable because it can safely support the current load without excessive heating and provides a margin of safety. Additionally, when analyzing wire sizes, it's important to consider the motor's starting current, which can be significantly higher than its running current. #12 gauge wire helps to ensure that the motor operates efficiently without risk of overheating, particularly during startup.

The other wire sizes listed would likely result in insufficient capacity to handle the motor's load without raising safety concerns or risking operation issues. Thus, #12 is the most appropriate choice for this application.