Question 1 of 10
What does FLC stand for in the context of NEC Table 430.250?
FLC stands for Full-Load Current, which is the current a motor draws when operating at its rated horsepower and voltage.
Question 2 of 10
Which NEC table is used to find the FLC for three-phase AC motors?
NEC Table 430.250 provides the FLC values for various horsepower and voltage combinations for three-phase AC motors.
Question 3 of 10
For continuous duty applications, the conductors supplying a motor must have an ampacity of at least what percentage of the motor's FLC?
NEC 430.22(A) requires conductors to be sized at 125% of the motor's FLC for continuous duty applications to account for heat generated during continuous operation.
Question 4 of 10
What is the primary purpose of using FLC values from NEC Table 430.250?
FLC values are essential for properly sizing conductors, overcurrent protection devices, and motor control equipment.
Question 5 of 10
According to NEC 430.6(A)(1), which FLC value is used for conductor sizing and overcurrent protection calculation?
NEC 430.6(A)(1) mandates using the FLC from Table 430.250, even if different from the motor's nameplate.
Question 6 of 10
For a 10 HP, 460V motor, what is the FLC according to Table 430.250?
Referencing Table 430.250, a 10 HP motor at 460V has an FLC of 14 Amps.
Question 7 of 10
What is the minimum ampacity required for conductors supplying a continuous duty, 5 HP, 230V motor?
FLC for 5 HP at 230V is 15.2 Amps. Multiply by 1.25 for a continuous duty application: 15.2 * 1.25 = 19 A (Not listed, but the minimum required).
Question 8 of 10
Which of the following is NOT a parameter used for determining FLC in NEC Table 430.250?
Motor RPM is not a parameter used in Table 430.250 to find FLC.
Question 9 of 10
If a motor nameplate indicates a different FLC than Table 430.250, which value should be used for conductor sizing and protection?
NEC 430.6(A)(1) directs the use of the FLC from Table 430.250, regardless of nameplate values.
Question 10 of 10
What NEC table is primarily used to determine the ampacity of conductors?
NEC Table 310.16 provides ampacity ratings for various conductor types and sizes.
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