Question 5010 of 749 · Maryland Journeyperson Electrician Exam
Where rock bottom prevents driving a ground rod vertically, the rod may be driven at an angle not exceeding what from vertical?
Exactly one answer is correct.
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Correct answer to question 5010
- B: 45 degrees
Explanation
If rock prevents vertical driving, the rod may be driven at an oblique angle not over 45 degrees from vertical. If that is also not possible, it may be buried in a trench. See 250.53.
More questions: Grounding and Bonding
- 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?
- 5015The portion of a grounding electrode conductor that is the sole connection to one or more ground rods is not required to be larger than
- 5016The portion of a GEC that is the sole connection to a concrete-encased electrode is not required to be larger than