Equipment & SystemsQuestion 244 of 521
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?
a.40 A
b.44 A
c.46 A
d.50 A
Explanation
For a motor with a marked service factor of 1.15 or greater, 430.32(A)(1) permits overload protection up to 125% of the nameplate FLA: 40 x 1.25 = 50 A. 44 A is 110%, 46 A is 115% (used only for other motors), and 40 A applies no multiplier.
Law Reference: 2023 NEC §430.32Practice all 521 questions free — no signup required.
Related questions on this topic
- Using NEC Table 430.250, what is the full-load current (FLC) of a 10 HP, three-phase, 460-volt squirrel-cage motor?
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