Practice Test GeeksNEC Practice Test
← All NEC Flashcard Decks

Grounding and Bonding Flashcards

7 cards from real NEC 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. According to NEC 250.68, how must a grounding electrode conductor connection to a grounding electrode be made?

    Answer: Accessible and using listed means

    NEC 250.68 requires grounding electrode conductor connections to be accessible and made with listed connectors, clamps, or fittings.

  2. What is the minimum burial depth for a bare copper grounding electrode conductor run underground per NEC 250.64(B)?

    Answer: No burial depth requirement — it may run exposed if protected

    NEC 250.64(B) allows grounding electrode conductors to be exposed or in a raceway but does not mandate burial; physical protection is required where subject to damage.

  3. Per NEC 250.30, what is required at a separately derived system such as a transformer?

    Answer: A system bonding jumper and grounding electrode

    NEC 250.30(A) requires both a system bonding jumper and a grounding electrode for a separately derived system.

  4. Which of the following is NOT an acceptable grounding electrode per NEC 250.52?

    Answer: A plastic water pipe

    Plastic water pipe is not conductive and cannot serve as a grounding electrode; NEC 250.52 lists only metal or conductive electrodes.

  5. What minimum diameter must a ground rod electrode be if made of stainless steel or listed material per NEC 250.52(A)(5)?

    Answer: 5/8 inch

    NEC 250.52(A)(5) requires ground rods of stainless steel or listed materials to be at least 5/8 inch in diameter.

  6. Under NEC 250.104, what must be bonded in a building that has a metal gas piping system?

    Answer: The metal gas piping must be bonded to the equipment grounding conductor

    NEC 250.104(B) requires metal gas piping to be bonded to the equipment grounding conductor of the circuit that may energize the piping.

  7. Per NEC 250.142, which systems are permitted to use the grounded conductor (neutral) to ground equipment on the supply side of the service?

    Answer: Service equipment and meter enclosures only

    NEC 250.142(A) permits using the grounded conductor to ground equipment only on the supply side of or within service equipment.