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Grounding & Bonding Requirements Flashcards

7 cards from real CEI 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 Requirements flashcards as text

  1. At a subpanel (remote distribution panel), the neutral bus and ground bus must be:

    Answer: Separated and not connected

    At a subpanel, the neutral and ground buses must be kept separate to prevent objectionable current from flowing on grounding conductors per NEC 250.142.

  2. What minimum burial depth is required for a ground rod electrode?

    Answer: 8 feet

    NEC 250.53(G) requires ground rods to be driven to a depth of at least 8 feet in contact with the soil.

  3. Which conductor is used to connect the grounding electrode to the grounded service conductor or equipment?

    Answer: Grounding electrode conductor

    The grounding electrode conductor (GEC) is the conductor that connects the grounding electrode system to the grounded conductor or equipment per NEC Article 100.

  4. Bonding of metal gas piping is required when the piping system could become energized. The bond must be connected to:

    Answer: The equipment grounding conductor or grounded service conductor

    Per NEC 250.104(B), metal gas piping must be bonded to the service equipment enclosure, grounded conductor at the service, or grounding electrode conductor.

  5. What is the minimum size copper grounding electrode conductor for a service with 3/0 AWG copper service-entrance conductors per NEC Table 250.66?

    Answer: 2 AWG

    Per NEC Table 250.66, service-entrance conductors of 2/0–3/0 AWG copper require a minimum 2 AWG copper grounding electrode conductor.

  6. An equipment grounding conductor run with circuit conductors in a raceway must be:

    Answer: Insulated green or bare

    NEC 250.119 permits EGCs to be bare, covered, or insulated; if insulated, they must be green or green with yellow stripe.

  7. When two ground rods are used to meet the 25-ohm requirement, what minimum separation must be maintained between them?

    Answer: 6 feet

    NEC 250.53(B) requires multiple rod electrodes to be at least 6 feet apart to ensure their effective resistance areas do not significantly overlap.