What is the minimum size conductor required for a standard SJ cord connecting a motor rated at 5 hp 208-230/460-V, 3Ø?

To determine the minimum size conductor required for a standard SJ cord connecting a 5 hp motor rated at 208-230/460-V 3-phase, it's important to consider the following:

For a 5 hp motor operating on a 208-230 volt system, the full load current can be calculated using the National Electrical Code (NEC) values. Specifically, a 5 hp, 3-phase motor at 230 volts typically has a full load current of around 15 amps. When you’re using SJ cords, which are flexible and designed for use in applications like this one, you will reference the appropriate ampacity tables from the NEC to determine the wire size necessary to safely handle that current without overheating.

According to NEC Table 310.16, for conductors in free air or raceways, a 12 AWG wire has a maximum ampacity of 20 amps (which is adequate for a 15-amp full load current). Therefore, using 12 gauge conductors provides a safety buffer and complies with NEC requirements.

The choice of 12 AWG as the correct size conductor ensures that the installation is not only safe, but also operates efficiently within the electrical code guidelines. Additionally, the application of a larger conductor helps