Question 2059 of 844 · Washington 01 Journey Level Electrician Exam
Ground-fault protection of equipment is required for a service disconnect rated 1200 A on which system?
Exactly one answer is correct.
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Correct answer to question 2059
- B: 480Y/277 volt, 3-phase, 4-wire solidly grounded wye
Explanation
GFPE applies to solidly grounded wye services of more than 150 volts to ground for each disconnect rated 1000 A or more. A 480Y/277 volt system is 277 volts to ground, while 208Y/120 volt is only 120 volts to ground. See 230.95.
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