Question 6005 of 749 · Maryland Journeyperson Electrician Exam
What is the minimum cover for direct burial cable installed under a 4 in thick concrete slab with no vehicular traffic that extends at least 6 in beyond the installation?
Exactly one answer is correct.
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Correct answer to question 6005
- A: 18 in
Explanation
Under a minimum 4 in exterior concrete slab with no vehicular traffic, extending at least 6 in beyond the installation, direct burial cable needs 18 in of cover and raceways need 4 in. See Table 300.5 in NEC 2020 and 2023; the underground installation rules are in 300.7 in NEC 2026.
More questions: Wiring Methods, Conductors and Boxes
- 6006What is the minimum cover for any wiring method installed under a public street, highway, alley, or commercial parking lot?
- 6007Direct buried conductors emerging from grade must be protected by enclosures or raceways to what height above finished grade?
- 6008Under NEC 2020 and 2023, where must a warning ribbon be placed for direct buried service conductors that are 18 in or more below grade and not encased in concrete?
- 6010What does the Code require for backfill around underground cables and raceways?
- 6012When a cable is installed through a bored hole in a wood stud, how far must the edge of the hole be from the nearest edge of the stud unless a steel plate is used?
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