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Grounding & Bonding Flashcards

7 cards from real NCCER ELECTRICAL 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 & Bonding flashcards as text

  1. What is the primary purpose of bonding metallic parts of an electrical system?

    Answer: To ensure electrical continuity and establish a low-impedance path capable of safely conducting fault current

    Bonding electrically connects all metal parts to ensure continuity and provide a reliable fault current path back to the source.

  2. Where is the main bonding jumper required to be installed in a service?

    Answer: At the service equipment, connecting the grounded conductor to the equipment grounding conductor

    The main bonding jumper connects the grounded (neutral) conductor to the equipment grounding conductor at the service equipment per NEC 250.28.

  3. What is a system bonding jumper, as defined in NEC Article 250?

    Answer: The connection between the grounded circuit conductor and the supply-side EGC at a separately derived system

    A system bonding jumper performs the neutral-to-ground bond at a separately derived system, such as a transformer secondary, per NEC 250.30.

  4. Per NEC 250.92, which components at the service entrance are required to be bonded?

    Answer: All metal enclosures, raceways, and equipment enclosing or supporting service conductors

    NEC 250.92 requires that all metallic components enclosing or supporting service conductors be bonded to ensure electrical continuity.

  5. What is the purpose of an equipment bonding jumper installed around a concentric or eccentric knockout?

    Answer: To maintain equipment grounding conductor continuity across a fitting that may not ensure reliable metal-to-metal contact

    Concentric knockouts can interrupt the grounding path; equipment bonding jumpers bridge the gap to maintain EGC continuity.

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

    Answer: Article 250

    NEC Article 250 covers all general requirements for grounding and bonding of electrical systems, circuits, and equipment.

  7. Using NEC Table 250.66, what is the minimum copper grounding electrode conductor (GEC) size for a 200-ampere service with 2/0 AWG copper service-entrance conductors?

    Answer: 4 AWG

    Per NEC Table 250.66, service-entrance conductors of 1/0–2/0 AWG copper require a minimum 4 AWG copper grounding electrode conductor.

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