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Code Requirements Flashcards

7 cards from real F80 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. According to the NEC, what is the minimum burial depth for a rigid metal conduit (RMC) installed under a residential driveway?

    Answer: 12 inches

    NEC Table 300.5 requires RMC to be buried at least 6 inches under a residential driveway, but under a one- or two-family dwelling driveway the requirement is 12 inches.

  2. Under the NEC, which of the following locations requires GFCI protection for 15- and 20-ampere, 125-volt receptacles?

    Answer: Finished basement living areas

    NEC 210.8(A) requires GFCI protection for receptacles in unfinished and finished basement areas of dwelling units.

  3. What is the maximum length of a flexible cord that may be used as a fixed wiring method for a stationary appliance under the NEC?

    Answer: Flexible cords cannot be used as fixed wiring

    NEC 400.12 prohibits flexible cords from being used as a substitute for fixed wiring, regardless of length.

  4. According to NEC 310.15, which conductor ampacity correction factor applies when conductors are installed in an ambient temperature of 40°C (104°F)?

    Answer: 0.82

    For 75°C-rated conductors at 40°C ambient, NEC Table 310.15(B)(1) specifies a correction factor of 0.82.

  5. The NEC requires service-entrance conductors to be protected from physical damage. Which of the following is NOT an acceptable wiring method for service-entrance conductors above a roof?

    Answer: Type NM cable

    NEC 230.43 lists acceptable wiring methods for service-entrance conductors, and Type NM (non-metallic sheathed) cable is not among them.

  6. Under NEC 250.52, which electrode is NOT considered a grounding electrode?

    Answer: A driven ground rod with 25 ohms resistance

    A single ground rod that measures more than 25 ohms resistance must be supplemented with an additional electrode per NEC 250.56, but it is still considered a grounding electrode.

  7. According to NEC 230.24, what is the minimum clearance required for service-drop conductors over a public road when traffic could include trucks?

    Answer: 18 feet

    NEC 230.24(B) requires service-drop conductors over roads subject to truck traffic to maintain a minimum clearance of 18 feet.