Question 8004 of 749 · Maryland Journeyperson Electrician Exam
Which value is used to size separate motor overload protection?
Exactly one answer is correct.
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Correct answer to question 8004
- B: The motor nameplate full-load current
Explanation
Section 430.6(A)(2) requires separate motor overload protection to be based on the nameplate full-load current. Overloads must match the actual motor, while conductors and short-circuit protection use the table values.
More questions: Motors, HVAC, Generators and Transformers
- 8005A motor with a marked service factor of 1.15 needs a separate overload device. What is the maximum rating as a percentage of nameplate full-load current?
- 8006A motor is marked with a temperature rise of 40 degrees C. What overload rating is permitted as a percentage of nameplate current?
- 8007A motor has a service factor of 1.0 and no temperature rise marking. What is the maximum overload rating?
- 8008A motor with a service factor of 1.0 has a nameplate current of 20 A. What is the maximum separate overload setting under 430.32(A)(1)?
- 8009The overload selected at 125 percent is not enough to start a motor with a service factor of 1.15. What is the highest rating the next step permits?
- 8010How many overload units are required for a three-phase ac motor?