NM CID EL-1 Practice Questions - New Mexico CID EL-1 Electrical Distribution Systems, Including Transmission Lines Examination Exam

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A 500 kVA three-phase transformer is rated 12,470 V on the primary. Using NEC Table 450.3(A) for an unsupervised location, the maximum primary circuit-breaker setting is 300 percent of rated primary current. What is the next standard breaker size permitted by Note 1 if the calculated maximum is not a standard rating?

20 A 40 A 70 A 150 A

Correct Answer:

70 A

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