CalculationsQuestion 15 of 110
A motor with a service factor of 1.15 has a nameplate full-load current of 34 A. What is the maximum overload protection setting at 125%?
a.34 A
b.39.1 A
c.42.5 A
d.45.9 A
Explanation
For a motor with service factor 1.15 or greater, overload is set at up to 125% of nameplate FLA: 34 x 1.25 = 42.5 A.
Law Reference: 2023 NEC 430.32Practice all 110 questions free — no signup required.
Related questions on this topic
- An electric range has a Column C demand of 8,000 VA. Using the 70% neutral demand for ranges, what is the range contribution to the feeder neutral load?
- From the motor full-load current table, what is the full-load current of a 25-HP, 480-V, three-phase induction motor?
- A single continuous-duty motor has a table full-load current of 34 A. What minimum conductor ampacity is required for its branch circuit?
- For a motor with a 34-A full-load current, what is the maximum inverse-time circuit breaker for branch-circuit short-circuit and ground-fault protection (250%, then next higher standard size)?
- A feeder supplies three motors with full-load currents of 34 A, 28 A, and 22 A. What minimum conductor ampacity is required for the feeder?
- What is the full-load primary current of a 75-kVA, 480-V, three-phase transformer?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against Master Electrician Licensing Exam (NEC-based) · How we review