Question 5012 of 749 · Maryland Journeyperson Electrician Exam
Where two ground rods are installed to meet the supplemental electrode requirement, they must be spaced at least how far apart?
Exactly one answer is correct.
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Correct answer to question 5012
- D: 6 ft
Explanation
Multiple rod, pipe, or plate electrodes used to supplement each other must be at least 6 ft apart. Closer spacing reduces the effectiveness of the second electrode. See 250.53.
More questions: Grounding and Bonding
- 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?
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- 5018A service has 2/0 AWG copper ungrounded conductors. What is the minimum copper GEC to a metal water pipe electrode?