Question 5009 of 938 · Maryland Journeyperson Electrician Exam
An unlisted rod electrode of stainless steel or copper-coated steel must have a diameter of at least
Exactly one answer is correct.
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Correct answer to question 5009
- A: 5/8 in
Explanation
Rod-type electrodes of stainless steel and copper or zinc coated steel must be at least 5/8 in in diameter unless listed. Listed rods are permitted to be smaller. See 250.52(A)(5).
More questions: Grounding and Bonding
- 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?
- 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