Which table is used for FLC for single-phase motors?

Which table is used for FLC for single-phase motors?

• A. NEC Section 220.52
• B. NEC Table 430.248
• C. NEC Table 220.45
• D. NEC Section 230.31

Answer: (B)

When sizing feeders and overcurrent protection for motors, you use the full-load current (FLC) listed in the NEC motor tables. For motors, the FLC values are provided in tables that are specific to the motor configuration. For single-phase motors, the table that gives the full-load current by horsepower and voltage is the one you consult. That is why the correct choice is NEC Table 430.248—it directly lists the full-load currents you use in calculations for single-phase motors. Other references in the NEC deal with different topics or motor configurations. They don’t provide the motor-specific FLC values needed to size conductors and protection for a single-phase motor, so they aren’t appropriate for determining the FLC in this scenario.

When sizing feeders and overcurrent protection for motors, you use the full-load current (FLC) listed in the NEC motor tables. For motors, the FLC values are provided in tables that are specific to the motor configuration. For single-phase motors, the table that gives the full-load current by horsepower and voltage is the one you consult. That is why the correct choice is NEC Table 430.248—it directly lists the full-load currents you use in calculations for single-phase motors.

Other references in the NEC deal with different topics or motor configurations. They don’t provide the motor-specific FLC values needed to size conductors and protection for a single-phase motor, so they aren’t appropriate for determining the FLC in this scenario.