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Grounding and Bonding Flashcards

7 cards from real Electrician practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Per NEC Table 250.122, what is the minimum size copper equipment grounding conductor required for a circuit protected by a 20-ampere overcurrent device?

    Answer: 12 AWG

    NEC Table 250.122 specifies that a 20-ampere overcurrent device requires a minimum 12 AWG copper equipment grounding conductor.

  2. In which location is it NOT permissible to connect neutral conductors and equipment grounding conductors together?

    Answer: At a remote subpanel fed from the same service

    Per NEC 250.142(B), neutral and equipment grounding conductors must not be interconnected at remote panelboards supplied from the same service.

  3. Which NEC article contains all of the requirements for grounding and bonding of electrical systems and equipment?

    Answer: Article 250

    NEC Article 250 is dedicated entirely to grounding and bonding requirements and is one of the most referenced articles on electrician licensing exams.

  4. Per NEC 250.52(A)(1), a metal underground water pipe used as a grounding electrode must have at least how many feet of direct earth contact?

    Answer: 10 feet

    NEC 250.52(A)(1) requires a metal underground water pipe to be in direct contact with the earth for at least 10 feet to qualify as a grounding electrode.

  5. What is the primary purpose of a grounding electrode system?

    Answer: To connect the electrical system to earth to stabilize voltage and dissipate lightning and transient surges

    The grounding electrode system connects the electrical system to earth to stabilize voltages to ground and safely dissipate lightning and transient overvoltages.

  6. The conductor that runs from the grounding electrode system to the neutral conductor at the service equipment is called the:

    Answer: Grounding electrode conductor (GEC)

    The grounding electrode conductor (GEC) connects the grounding electrode system to the neutral bus at the service equipment, linking the electrical system to earth.

  7. Per NEC Table 250.66, what is the maximum copper grounding electrode conductor size required regardless of how large the service entrance conductors are?

    Answer: 3/0 AWG copper

    NEC Table 250.66 caps the required grounding electrode conductor at 3/0 AWG copper, even for very large or paralleled service conductors.