Question 5011 of 844 · Washington 01 Journey Level Electrician Exam
A single rod electrode does not need a supplemental electrode only if its resistance to earth is
Exactly one answer is correct.
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Correct answer to question 5011
- C: 25 ohms or less
Explanation
A single rod, pipe, or plate electrode must be supplemented by an additional electrode unless it has a resistance to earth of 25 ohms or less. See 250.53.
More questions: Grounding and Bonding
- 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
- 5017The portion of a GEC that is the sole connection to a ground ring is not required to be larger than