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Grounding and Bonding Flashcards

6 cards from real TN LLE 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. Per NEC 250.30, what grounding requirements apply to a separately derived system such as a transformer?

    Answer: A system bonding jumper and grounding electrode conductor must be installed at the source

    NEC 250.30(A) requires separately derived systems to have a system bonding jumper and a grounding electrode conductor connected to a grounding electrode at or near the source.

  2. What is the difference between 'grounding' and 'bonding' as defined by the NEC?

    Answer: Grounding connects to the earth; bonding connects conductive parts together to ensure electrical continuity

    The NEC defines grounding as connecting to the earth, while bonding is connecting conductive parts together to establish electrical continuity and conductivity.

  3. Per NEC 250.118, which of the following is recognized as an equipment grounding conductor?

    Answer: A copper conductor, EMT, IMC, RMC, or listed flexible metal conduit under specific conditions

    NEC 250.118 lists approved equipment grounding conductors including copper/aluminum wire, EMT, IMC, RMC, and certain listed flexible conduits and cable assemblies.

  4. Per NEC 250.68(A), what is required for grounding electrode conductor connections?

    Answer: They must be accessible, except for connections made by listed irreversible compression-type connectors, exothermic welding, or buried connections

    NEC 250.68(A) requires GEC connections to be accessible except when made with irreversible compression connectors, exothermic welds, or connections to buried electrodes.

  5. What is the minimum size copper bonding jumper required for a 200A service per NEC Table 250.66?

    Answer: 4 AWG

    Per NEC Table 250.66, a 200A service with 2/0 AWG copper or 4/0 AWG aluminum service conductors requires a minimum 4 AWG copper grounding electrode conductor, which is also the basis for the bonding jumper.

  6. Per NEC 250.24(A)(5), what is the rule regarding neutral-to-ground connections in subpanels?

    Answer: The grounded conductor (neutral) must not be connected to the equipment grounding conductor or enclosure at subpanels

    NEC 250.24(A)(5) prohibits reconnecting the neutral to ground at any point on the load side of the service disconnecting means, including subpanels.