For a 1Ø motor supplied by a 120/240-V, 1-ph, panel, the minimum size circuit conductors permitted are how many AWG?

For a 1Ø motor supplied by a 120/240-V, 1-ph, panel, the minimum size circuit conductors permitted are how many AWG?

• A. 12
• B. 8
• C. 10
• D. 6

Answer: (B)

The correct answer is based on the National Electrical Code (NEC) guidelines for the sizing of conductors that are used for one-phase (1Ø) motors. When determining the minimum size of circuit conductors for motors, factors such as the continuous load demand and the motor's full-load amperage need to be considered. In this case, for a single-phase motor supplied by a 120/240-V panel, the conductor size is primarily determined by the motor's current rating and the allowable ampacity for the conductor. For motors, a common rule is to size the conductors at 125% of the motor’s full-load current to account for any potential inrush currents when the motor starts. Using the NEC ampacity tables, a minimum of 8 AWG conductors is typically required, especially when dealing with larger motor loads. This size provides enough current-carrying capacity while ensuring safe operation and compliance with local electrical codes. Therefore, for the given single-phase motor operating at 120/240 volts, sizing the conductors to 8 AWG ensures that the circuit can handle the motor's operational demands without risking overheating or electrical failure, making it the appropriate size for this application.

The correct answer is based on the National Electrical Code (NEC) guidelines for the sizing of conductors that are used for one-phase (1Ø) motors. When determining the minimum size of circuit conductors for motors, factors such as the continuous load demand and the motor's full-load amperage need to be considered.

In this case, for a single-phase motor supplied by a 120/240-V panel, the conductor size is primarily determined by the motor's current rating and the allowable ampacity for the conductor. For motors, a common rule is to size the conductors at 125% of the motor’s full-load current to account for any potential inrush currents when the motor starts.

Using the NEC ampacity tables, a minimum of 8 AWG conductors is typically required, especially when dealing with larger motor loads. This size provides enough current-carrying capacity while ensuring safe operation and compliance with local electrical codes.

Therefore, for the given single-phase motor operating at 120/240 volts, sizing the conductors to 8 AWG ensures that the circuit can handle the motor's operational demands without risking overheating or electrical failure, making it the appropriate size for this application.