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NEC Code and Calculations Flashcards

7 cards from real CEA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 NEC Code and Calculations flashcards as text

  1. Under NEC 210.52, receptacle outlets in a dwelling unit kitchen must be served by at least how many small appliance branch circuits?

    Answer: Two 20-ampere circuits

    NEC 210.52(B)(1) requires at least two 20-ampere small appliance branch circuits for kitchen receptacle outlets.

  2. According to the NEC, what is the minimum cover depth for direct-buried Type UF cable under a public sidewalk?

    Answer: 24 inches

    NEC Table 300.5 requires Type UF cable to be buried at least 24 inches under a public sidewalk or driveway.

  3. What is the kVA demand for three household ranges each rated at 12 kW, using NEC Table 220.55?

    Answer: 21 kW

    NEC Table 220.55 specifies a demand of 21 kW (maximum demand) for three ranges each rated between 8.75–12 kW using Column C values.

  4. The NEC defines a 'qualified person' as someone who has skills and knowledge related to the construction and operation of the electrical equipment and has received which type of training?

    Answer: Safety training on the hazards involved

    NEC Article 100 defines a qualified person as one who has skills, knowledge of electrical equipment, and has received safety training on the hazards involved.

  5. Under NEC 250.52, which of the following qualifies as a grounding electrode?

    Answer: A metal underground water pipe in contact with the earth for at least 10 feet

    NEC 250.52(A)(1) permits a metal underground water pipe with at least 10 feet of direct contact with the earth as a grounding electrode.

  6. According to the NEC, what is the maximum distance between supports for EMT (electrical metallic tubing) installed horizontally?

    Answer: 10 feet

    NEC 358.30 requires EMT to be securely fastened at intervals not exceeding 10 feet.

  7. A panelboard feeder must be sized for the calculated load plus a demand factor. If the calculated load is 120 amperes continuous, what is the minimum feeder conductor ampacity?

    Answer: 150 amperes

    NEC 215.2(A)(1) requires feeder conductors for continuous loads to be sized at 125% of the continuous load: 120A × 1.25 = 150 amperes.