Question 5045 of 749 · Maryland Journeyperson Electrician Exam
Why is the earth not permitted as the effective ground-fault current path?
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Correct answer to question 5045
- A: Its impedance is too high to make OCPDs trip reliably
Explanation
The earth has high impedance, so a ground fault through earth may not draw enough current to open the OCPD. The Code requires a low-impedance metallic path instead. See 250.4(A)(5).
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