Question 2045 of 749 · Maryland Journeyperson Electrician Exam
Overhead service conductors operating at more than 300 volts to ground pass over a residential driveway. What is the minimum vertical clearance?
Exactly one answer is correct.
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Correct answer to question 2045
- A: 15 ft
Explanation
Where the voltage exceeds 300 volts to ground, the clearance over residential property, driveways and commercial areas not subject to truck traffic rises from 12 ft to 15 ft. Note that a 480Y/277 volt system is only 277 volts to ground, so it would still fall under the 12 ft value. See 230.24(B).
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