Question 5059 of 731 · Texas Journeyman Electrician Exam
Which of these AC systems is required to be grounded?
Exactly one answer is correct.
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Correct answer to question 5059
- C: 120/240 V, single-phase, 3-wire
Explanation
Systems where the maximum voltage to ground on the ungrounded conductors does not exceed 150 V, such as 120/240 V single-phase, must be grounded. The other systems are permitted or required to be ungrounded. See 250.20.
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