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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.

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  1. A structural steel frame of a building qualifies as a grounding electrode when it is connected to at least how many concrete-encased electrodes or ground rings?

    Answer: Two

    Per NEC 250.52(A)(2), structural metal that is bonded to two or more concrete-encased electrodes or ground rings qualifies as a grounding electrode.

  2. Which of the following correctly describes 'bonding' as distinguished from 'grounding'?

    Answer: Bonding connects metal parts together for continuity; grounding connects to earth

    Bonding establishes electrical continuity between conductive parts, while grounding establishes a connection to the earth reference.

  3. Where must the system bonding jumper for a separately derived system be installed?

    Answer: At the source or at the first disconnecting means

    Per NEC 250.30(A)(1), the system bonding jumper for an SDS may be installed at the source or at the first disconnecting means, but not both.

  4. For a residential service, the grounding electrode conductor connection to a metal underground water pipe must be made within how many feet of the point of entrance into the building?

    Answer: 10 feet

    NEC 250.52(A)(1) requires that the metal water pipe electrode connection be made within the first 5 feet of the water pipe's entrance into the building.

  5. Intersystem bonding terminations at the service are required to accommodate bonding conductors from which systems?

    Answer: Communications, radio/TV, and network-powered broadband systems

    NEC 250.94 requires an intersystem bonding termination for communications, radio and television, and network-powered broadband systems.

  6. A ground ring electrode must encircle the building and consist of at least how many feet of bare copper conductor?

    Answer: 20 feet buried at least 30 inches

    NEC 250.52(A)(4) requires a ground ring to encircle the building with at least 20 feet of bare copper conductor not smaller than 2 AWG, buried at least 30 inches deep.

  7. When a grounding electrode conductor is installed in a ferrous metal raceway, the raceway must be bonded at both ends to:

    Answer: Prevent inductive choke effect

    Per NEC 250.64(E), ferrous metal raceways enclosing GECs must be bonded at both ends to prevent an inductive choke that would impede fault current flow.