Question 5021 of 749 · Maryland Journeyperson Electrician Exam
A service has two parallel sets of 3/0 AWG copper (about 168 kcmil each). What is the minimum copper GEC to a water pipe electrode?
Exactly one answer is correct.
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Correct answer to question 5021
- A: 2 AWG
Explanation
For parallel sets, the GEC is sized on the equivalent area of the paralleled conductors: 2 x 167.8 kcmil = 335.6 kcmil. That falls in the over 3/0 through 350 kcmil row of Table 250.66, which requires 2 AWG copper.
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