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Grounding & Bonding Requirements Flashcards

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  1. Which of the following cannot be used as a sole grounding electrode because it is not permitted to be used alone without supplementing?

    Answer: Metal underground water pipe

    Per NEC 250.53(D)(2), a metal underground water pipe must be supplemented by an additional grounding electrode because its continuity cannot be guaranteed.

  2. The equipment bonding jumper on the supply side of the service is permitted to be installed inside or outside a raceway, but if outside, it cannot exceed:

    Answer: 6 feet

    NEC 250.102(C)(2) limits the length of a supply-side bonding jumper installed outside a raceway to not more than 6 feet.

  3. What NEC section prohibits using a grounding electrode conductor as a current-carrying conductor under normal operation?

    Answer: 250.6

    NEC 250.6 addresses objectionable current over grounding conductors, prohibiting designs that cause grounding conductors to carry normal operating current.

  4. For a 200-ampere service with 4/0 AWG aluminum service conductors, what minimum size copper GEC is required per NEC Table 250.66?

    Answer: 2 AWG

    NEC Table 250.66 requires a 2 AWG copper GEC for service conductors ranging from 3/0 to 350 kcmil aluminum.

  5. Which type of fitting is required when a grounding electrode conductor passes through a knockout in a metal enclosure?

    Answer: A fitting listed for grounding electrode conductor use

    Per NEC 250.64(B), grounding electrode conductors must be protected from physical damage, and fittings must be listed for the purpose when entering metal enclosures.

  6. In a multi-family dwelling, each unit's grounding electrode system must be:

    Answer: Connected to a common grounding electrode system

    Per NEC 250.32, buildings or structures supplied by a feeder or branch circuit must have a grounding electrode system interconnected with the overall system.

  7. What is the maximum size equipment grounding conductor required per NEC 250.122, regardless of overcurrent device size?

    Answer: The size of the largest ungrounded service conductor

    Per NEC 250.122(B), where EGC size is increased due to voltage drop, it need not exceed the size of the largest ungrounded conductor of the circuit.