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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 the NEC, what is the minimum burial depth for rigid metal conduit (RMC) under a residential driveway?

    Answer: 6 inches

    NEC Table 300.5 specifies 6 inches minimum cover for RMC under a residential driveway.

  2. What does the NEC require regarding GFCI protection for all 125-volt, 15- and 20-ampere receptacles in a bathroom?

    Answer: All bathroom receptacles must be GFCI-protected

    NEC 210.8(A)(1) requires GFCI protection for all 125-volt, 15- and 20-ampere receptacles in bathrooms.

  3. A circuit has a resistance of 12 ohms and a voltage of 120 volts. What is the current using Ohm's Law?

    Answer: 10 amperes

    Ohm's Law: I = V ÷ R = 120 ÷ 12 = 10 amperes.

  4. According to the NEC, what minimum headroom must be maintained in front of electrical equipment rated 600 volts or less?

    Answer: 6.5 feet (2.0 m)

    NEC 110.26(A)(3) requires a minimum headroom of 6.5 feet in front of service equipment, panelboards, and similar equipment.

  5. Which NEC article covers grounding and bonding requirements?

    Answer: Article 250

    NEC Article 250 covers all grounding and bonding requirements for electrical systems.

  6. Under the NEC, what size copper equipment grounding conductor (EGC) is required for a 60-ampere circuit?

    Answer: 10 AWG

    NEC Table 250.122 requires a minimum 10 AWG copper EGC for circuits protected at up to 60 amperes.

  7. What is the power (in watts) consumed by a 10-ohm resistor carrying 5 amperes?

    Answer: 250 watts

    Power formula: P = I² × R = 5² × 10 = 25 × 10 = 250 watts.