What is the permissible minimum gauge for the SO cord connecting a motor rated 15 HP at 230 volts with an FLA of 35 amps?

To determine the permissible minimum gauge for the SO cord connecting a motor rated 15 HP at 230 volts with a full load amperage (FLA) of 35 amps, it's important to consider the American Wire Gauge (AWG) standards along with the National Electrical Code (NEC) guidelines for motors.

In general, for a motor application, the NEC recommends that conductors should be sized based on the motor's FLA to safely handle the current load and minimize voltage drop. For 35 amps, the minimum wire gauge must be able to handle this current while considering factors such as the length of the run, the environment, and potential heat buildup.

A 6 AWG wire is designed for higher amperages and provides sufficient capacity for a 35 amp load, ensuring that the wire does not overheat and creates a safe operation. It offers the necessary protection against overcurrent and voltage drop that could hinder motor performance and efficiency. The larger gauge also accounts for possible future loads or contingencies that may arise over time.

This reasoning confirms that a 6 AWG cord is appropriate and necessary for ensuring safe and effective operation of the motor.