Question 3044 of 749 · Maryland Journeyperson Electrician Exam
A building main disconnect, not the service disconnect, is rated 1200 A on a 480Y/277 volt system. What does the NEC require?
Exactly one answer is correct.
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Correct answer to question 3044
- C: GFPE in accordance with 230.95
Explanation
Each building or structure main disconnect rated 1000 A or more on solidly grounded wye systems over 150 volts to ground needs GFPE per 230.95. Exceptions cover continuous industrial processes, fire pumps and cases where protection is provided elsewhere. See 240.13.
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