Question 3038 of 1033 · Washington 01 Journey Level Electrician Exam
For which system does the NEC require selective coordination of OCPDs?
Exactly one answer is correct.
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Correct answer to question 3038
- D: Emergency systems
Explanation
Selective coordination is required for emergency systems, legally required standby systems, elevator circuits with more than one driving machine, fire pumps and critical operations power systems. General loads do not require it. See 700.32.
More questions: Feeders and Overcurrent Protection
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- 3044A building main disconnect, not the service disconnect, is rated 1200 A on a 480Y/277 volt system. What does the NEC require?