Practice Test GeeksElectrician Practice Test
← All Electrician Flashcard Decks

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.

Read the first 7 Grounding and Bonding flashcards as text

  1. What is the primary purpose of equipment grounding in an electrical system?

    Answer: To provide a low-impedance fault current path back to the source

    Equipment grounding provides a low-impedance return path so overcurrent devices trip quickly during a ground fault, protecting people and equipment.

  2. What is the minimum size copper grounding electrode conductor required for a service with 2/0 AWG copper service entrance conductors per NEC Table 250.66?

    Answer: 4 AWG

    Per NEC Table 250.66, service entrance conductors in the 1/0–3/0 AWG range require a minimum 4 AWG copper grounding electrode conductor.

  3. According to NEC 250.119, which of the following correctly identifies an equipment grounding conductor?

    Answer: Green, green with yellow stripe, or bare

    NEC 250.119 requires equipment grounding conductors to be identified by green insulation, green with yellow stripe, or left bare.

  4. The main bonding jumper in a service panel connects which two components?

    Answer: The neutral (grounded) bus to the equipment grounding bus and enclosure

    The main bonding jumper connects the neutral conductor to the equipment grounding conductor and service enclosure, establishing the required neutral-to-ground bond at the service.

  5. Per NEC 250.53(G), what is the minimum depth a ground rod electrode must be driven into the earth?

    Answer: 8 feet

    NEC 250.53(G) requires ground rods to be driven to a depth of at least 8 feet to ensure adequate earth contact.

  6. Which of the following is specifically prohibited from use as a grounding electrode per NEC 250.52(B)?

    Answer: Metal underground gas piping

    NEC 250.52(B)(1) explicitly prohibits metal underground gas piping from being used as a grounding electrode due to the explosion hazard from arcing.

  7. What is the primary purpose of bonding metallic components together in an electrical system?

    Answer: To establish electrical continuity so all metal parts remain at the same potential

    Bonding connects metallic parts to maintain equal potential between them and provides a low-impedance path for fault current to operate overcurrent devices.