The minimum size circuit conductors for a motor powered by a 2-pole breaker in a 120/208-V, 3-ph panel are what size?

To determine the minimum size circuit conductors for a motor powered by a 2-pole breaker in a 120/208-V, 3-phase panel, it is essential to reference the National Electrical Code (NEC) guidelines, particularly Table 310.16, which provides information on conductor ampacity.

In most cases, for motors, you would also consider the full-load current (FLA) rating of the motor and the specific requirements based on the application and wiring method. A 2-pole breaker in a 120/208-V, 3-phase system is typically used for smaller motors that operate at lower power ratings. The FLA and a few other factors, such as demand factors and continuous load requirements, will help determine the appropriate conductor size.

For most small to medium-sized motors connected at 208 volts, a common FLA for smaller motors would lead to the requirement of using a minimum of 10 AWG conductors, primarily in consideration of the 60-75°C rating of common conductors and the need to prevent overheating under full load.

Choosing 10 AWG satisfies the ampacity requirements for the motor circuit while ensuring safety and compliance with Code. Use of smaller conductors would not be appropriate based on typical