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NEC Code and Theory Flashcards

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Read the first 7 NEC Code and Theory flashcards as text

  1. Under NEC 250.66, the size of the grounding electrode conductor for a copper service entrance conductor sized at 2/0 AWG is determined by which table?

    Answer: Table 250.66

    NEC Table 250.66 is used to determine the minimum size of the grounding electrode conductor based on the largest service-entrance conductor.

  2. NEC 430.52 requires branch-circuit short-circuit and ground-fault protection for motors. For an inverse time circuit breaker protecting a Design B squirrel-cage motor, the maximum rating is what percentage of full-load current?

    Answer: 250%

    NEC Table 430.52 allows inverse time circuit breakers for Design B squirrel-cage motors to be rated up to 250% of the motor's full-load current.

  3. According to NEC 358.20, what is the minimum trade size for Electrical Metallic Tubing (EMT)?

    Answer: 1/2 inch

    NEC 358.20 specifies that the minimum trade size for EMT is 1/2 inch (metric designator 16).

  4. Which NEC article governs the installation of electrical systems in hazardous (classified) locations using the Zone equipment classification system?

    Answer: Article 505

    NEC Article 505 covers Class I, Zone 0, 1, and 2 hazardous locations using the Zone classification system.

  5. NEC 240.4(D) limits overcurrent protection for small conductors. What is the maximum OCPD permitted for 14 AWG copper conductors?

    Answer: 15 amperes

    NEC 240.4(D)(3) limits overcurrent protection for 14 AWG copper conductors to a maximum of 15 amperes.

  6. Under NEC 410.116, luminaires installed in closets must maintain a minimum clearance of how many inches from the storage area when using recessed incandescent fixtures with a completely enclosed lamp?

    Answer: 12 inches

    NEC 410.116(B) requires recessed incandescent fixtures with completely enclosed lamps to maintain at least 6 inches from the storage area, but surface-mounted incandescent fixtures need 12 inches — for recessed enclosed, the code permits 6 inches.

  7. Per NEC 680.22, what type of receptacles are required within 6 to 10 feet of the inside walls of a permanently installed swimming pool?

    Answer: GFCI-protected receptacles

    NEC 680.22(A)(1) requires all receptacles located between 6 and 10 feet of a permanently installed pool to be GFCI protected.