Question 3018 of 844 · Washington 01 Journey Level Electrician Exam
Transformer secondary conductors not over 25 ft long must have an ampacity of at least what value?
Exactly one answer is correct.
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Correct answer to question 3018
- D: One-third of the primary OCPD rating multiplied by the primary-to-secondary voltage ratio
Explanation
For secondary conductors up to 25 ft, the ampacity must be at least one-third of the primary OCPD rating times the primary-to-secondary voltage ratio. They must terminate in a single breaker or set of fuses. See 240.21(C)(6).
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