Question 3004 of 844 · Washington 01 Journey Level Electrician Exam
A series combination rating may not be used when motors connected between the two devices contribute more than what percentage of the lower-rated breaker's interrupting rating?
Exactly one answer is correct.
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Correct answer to question 3004
- D: 1 percent
Explanation
Series ratings are not allowed where motors connected between the higher-rated OCPD and the lower-rated breaker have full-load currents totaling more than 1 percent of the interrupting rating of the lower-rated breaker. See 240.86(C).
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