Question 5005 of 749 · Maryland Journeyperson Electrician Exam
A concrete-encased electrode made of bare copper conductor must be at least 20 ft long and not smaller than what size?
Exactly one answer is correct.
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Correct answer to question 5005
- A: 4 AWG
Explanation
A concrete-encased electrode may consist of at least 20 ft of bare copper conductor not smaller than 4 AWG, or steel reinforcing bars, encased in concrete that is in direct contact with the earth. See 250.52(A)(3).
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