Equipment & SystemsQuestion 241 of 521
Using NEC Table 430.250, what is the full-load current (FLC) of a 10 HP, three-phase, 460-volt squirrel-cage motor?
a.14 A
b.28 A
c.21 A
d.11 A
Explanation
NEC Table 430.250 lists 14 A for a 10 HP 460 V three-phase motor; these table values (not nameplate amps) are used for conductor and overcurrent sizing. 28 A is the 230 V value, 21 A is a 15 HP motor, and 11 A is 7.5 HP at 460 V.
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Related questions on this topic
- Per NEC Table 430.248, what is the full-load current of a 5 HP, single-phase, 230-volt motor?
- A single continuous-duty 25 HP, 460 V, three-phase motor has an FLC of 34 A (Table 430.250). What minimum conductor ampacity is required for its branch circuit?
- A motor's nameplate shows a full-load current of 40 A and a service factor of 1.15. Under NEC 430.32(A)(1), what is the maximum overload device rating at 125% of nameplate FLA?
- For a 20 HP, 460 V, three-phase motor (FLC 27 A), what is the maximum inverse-time circuit breaker rating for branch-circuit short-circuit and ground-fault protection, using the 250% value of Table 430.52?
- Using the same 20 HP, 460 V motor (FLC 27 A), what is the maximum dual-element (time-delay) fuse permitted by Table 430.52 for branch-circuit short-circuit and ground-fault protection?
- A 5 HP, 230 V, three-phase motor has an FLC of 15.2 A. What is the maximum nontime-delay fuse permitted by Table 430.52 for branch-circuit protection?
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