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Basic Electrical Standards 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 Basic Electrical Standards flashcards as text

  1. What is the minimum burial depth for rigid metal conduit (RMC) installed under a residential driveway?

    Answer: 12 inches

    NEC Table 300.5 requires RMC to be buried at least 12 inches under residential driveways.

  2. According to the NEC, what color must the grounding conductor be identified by?

    Answer: Green or bare

    NEC 250.119 requires equipment grounding conductors to be green, green with yellow stripe, or bare.

  3. A 20-ampere, 125-volt receptacle outlet is required in which of the following bathroom locations per NEC?

    Answer: Within 3 feet of the sink basin

    NEC 210.52(D) requires at least one receptacle within 3 feet of each sink basin in bathrooms.

  4. What is the maximum voltage drop recommended by the NEC for branch circuits serving general loads?

    Answer: 3%

    NEC 210.19(A) informational note recommends keeping branch circuit voltage drop to 3% or less.

  5. Under the NEC, which conductor insulation type is rated for use in wet locations?

    Answer: THW

    THW insulation is rated for use in both dry and wet locations, unlike THHN which is dry-location only.

  6. What is the standard ampacity of a #12 AWG copper conductor with THHN insulation in a conduit with three current-carrying conductors?

    Answer: 20 amperes

    NEC Table 310.12 lists #12 AWG THHN copper at 20 amperes for up to three conductors in a raceway.

  7. Which NEC article governs the installation of services, including service-entrance conductors?

    Answer: Article 230

    NEC Article 230 covers services, including service conductors, service equipment, and clearances.