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Load Calculations & Branch Circuits Flashcards

7 cards from real NEC 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. What is the minimum general lighting load per square foot for a dwelling unit per NEC Table 220.12?

    Answer: 3 VA

    Dwelling units use a general lighting load of 3 VA per square foot under the standard calculation method.

  2. How many small-appliance branch circuits are required as a minimum in a dwelling kitchen?

    Answer: 2

    NEC 210.11(C)(1) requires at least two 20-ampere small-appliance branch circuits for the kitchen, pantry, and dining areas.

  3. A 20-ampere branch circuit at 120 volts has a maximum continuous load rating of how many amperes?

    Answer: 16 A

    Continuous loads are limited to 80% of the circuit rating, so 20 A x 0.80 = 16 A.

  4. What VA value is used for each small-appliance and laundry branch circuit in the standard dwelling calculation?

    Answer: 1500 VA

    NEC 220.52 requires a minimum of 1500 VA for each small-appliance and laundry branch circuit.

  5. Under the standard method, what demand factor applies to the dwelling general lighting load above the first 3000 VA up to 120,000 VA?

    Answer: 35%

    Per NEC Table 220.42, the portion from 3001 to 120,000 VA is taken at 35%.

  6. What is the minimum size THHN copper conductor permitted for a 20-ampere branch circuit?

    Answer: 12 AWG

    A 20-ampere branch circuit requires a minimum 12 AWG copper conductor.

  7. Receptacles in a dwelling are generally NOT counted as load in the standard calc because they are covered by which allowance?

    Answer: General lighting load

    In dwellings the general lighting load (3 VA/sq ft) covers general-use receptacle outlets, so they aren't added separately.