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
According to NEC 430.6(A)(1), which FLC value is used for sizing conductors and overcurrent protection?
NEC 430.6(A)(1) mandates using the FLC from Table 430.250 for conductor and overcurrent protection sizing, even if the nameplate value differs.
Question 3 of 10
For a single, continuous-duty motor, what percentage of the FLC from Table 430.250 is used to determine the minimum conductor ampacity?
The conductor ampacity must be at least 125% of the motor's FLC from Table 430.250 for continuous duty applications to account for heat generated during operation.
Question 4 of 10
What voltage ranges are explicitly permitted for use with the currents listed in NEC Table 430.250?
The table currents are for rated voltages but are also permitted for use within the 110-120V and 220-240V ranges.
Question 5 of 10
A 3-phase, 230V motor has a nameplate horsepower of 10 HP. What is the approximate FLC according to Table 430.250?
Looking at the table, a 10 HP motor at 230V has an FLC of approximately 28 Amps.
Question 6 of 10
What is the minimum ampacity required for conductors supplying a continuous duty 5 HP, 460V motor?
Table 430.250 shows that a 5 HP, 460V motor has an FLC of 7.6 A. The minimum conductor ampacity is 7.6 A * 1.25 = 9.5 A.
Question 7 of 10
What is the primary function of NEC Table 430.250?
The primary purpose of Table 430.250 is to provide standardized FLC values, essential for electrical design and code compliance.
Question 8 of 10
A 3-phase motor draws 10 Amps at 460V. What is the closest horsepower listed in Table 430.250?
By observing the table, we're looking for 10A at 460V. 7.6A is listed for 7.5HP, which is the closest value available.
Question 9 of 10
For a 100 HP, 460V motor, what is the FLC listed in NEC Table 430.250?
Looking at the table, a 100 HP, 460V motor has an FLC of 124 Amps.
Question 10 of 10
Why is the FLC from Table 430.250 crucial for electrical installations?
The FLC is fundamental for proper sizing of conductors and overcurrent protection, ensuring safe and compliant electrical systems.
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