Question 11012 of 1033 · Washington 01 Journey Level Electrician Exam
For emergency systems, what is required of the overcurrent protective devices?
Exactly one answer is correct.
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Correct answer to question 11012
- B: They must be selectively coordinated
Explanation
Emergency system OCPDs must be selectively coordinated with all supply-side OCPDs. This means a fault opens only the device closest to it and keeps the rest of the emergency system energized.
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