When connected to a 120/208-volt, 3Ø, 4-wire panelboard, what is the minimum size SO cord required for a motor?

When selecting the minimum size SO cord for a motor connected to a 120/208-volt, 3-phase, 4-wire panelboard, it is essential to consider the current-carrying capacity based on the National Electrical Code (NEC) and the application requirements for the motor.

The sizing of conductors is largely influenced by the motor's rated full-load current and the specific application, which can include continuous duty ratings and any applicable derating factors. Given that SO cord is specifically designed for good flexibility and resistance to environmental factors, it is crucial to ensure that the cord can handle the electrical load without overheating.

The most appropriate answer in this scenario would indicate a sizing that aligns with both the demands of the motor and the requirements of the code. An 8 AWG size provides sufficient capacity for most motors operated at 120/208 volts, accommodating the potential for inrush currents when the motor starts and ensuring safe operation over sustained use.

Choosing a size like 8 AWG ensures that the conductors can handle higher current levels, providing a margin of safety and efficiency, which is especially useful for larger motors or applications where the motor may be under heavy load. This choice reflects adherence to best practices in electrical installations, maintaining