Practice Test GeeksIEC - Independent Electrical Contractors Practice Test
← All IEC Flashcard Decks

Grounding and Bonding Flashcards

7 cards from real IEC 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 minimum size copper equipment grounding conductor required for a 60-ampere circuit per NEC Table 250.122?

    Answer: #8 AWG

    NEC Table 250.122 requires a minimum #8 AWG copper equipment grounding conductor for circuits rated up to 60 amperes.

  2. Which NEC article specifically covers grounding and bonding requirements?

    Answer: Article 250

    NEC Article 250 contains all general requirements for grounding and bonding of electrical installations.

  3. A main bonding jumper in a service panel connects which two components?

    Answer: The neutral (grounded) conductor to the equipment grounding conductor

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

  4. When is it permitted to connect the neutral bar and ground bar together in a subpanel?

    Answer: Never — neutral and ground must always be separate in subpanels

    In a subpanel (remote distribution panel), the neutral and equipment grounding conductors must always be kept separate to prevent objectionable current on grounding paths.

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

    Answer: To establish a reference voltage to earth and limit voltage imposed by lightning or line surges

    The grounding electrode system establishes a reference to earth potential and limits voltages imposed by lightning, line surges, or unintentional contact with higher-voltage lines.

  6. Per NEC 250.68(A), a grounding electrode conductor must be connected to the grounding electrode in what manner?

    Answer: By pressure connectors, clamps, or other listed means

    NEC 250.68(A) permits the grounding electrode conductor to be connected using listed pressure connectors, clamps, or other listed means; exothermic welding is not the only method.

  7. If a metal underground water pipe is used as a grounding electrode, what is the minimum buried length required by NEC 250.52(A)(1)?

    Answer: 10 feet

    NEC 250.52(A)(1) requires a metal underground water pipe electrode to have at least 10 feet of direct burial contact with the earth.