Question 5007 of 790 · California General Electrician Exam
A ground ring encircling a building must consist of at least 20 ft of bare copper conductor not smaller than
Exactly one answer is correct.
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Correct answer to question 5007
- C: 2 AWG
Explanation
A ground ring must be in direct contact with the earth, encircle the building, and consist of at least 20 ft of bare copper not smaller than 2 AWG. See 250.52(A)(4).
More questions: Grounding and Bonding
- 5008What is the minimum length of a rod or pipe grounding electrode?
- 5010Where rock bottom prevents driving a ground rod vertically, the rod may be driven at an angle not exceeding what from vertical?
- 5011A single rod electrode does not need a supplemental electrode only if its resistance to earth is
- 5012Where two ground rods are installed to meet the supplemental electrode requirement, they must be spaced at least how far apart?
- 5013A ground rod measured 40 ohms, so a second rod was driven 6 ft away. The pair still measures 30 ohms. What else is required?
- 5014Which of the following is NOT permitted to be used as a grounding electrode?