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NEC 2023

Advanced NEC Calculations Practice (planned)
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Planned general code practice. Not available for purchase or study access.

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Advanced NEC Calculations Practice (planned)
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NEC 2023
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What you’ll practice.

Load calculationsPractice topic
Transformers and motorsPractice topic
Grounding and conductorsPractice topic

Topic organization for this practice bank, not a claim of exhaustive official exam coverage. EPA mocks use 25 questions per section; A+ mocks keep the two Cores separate.

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Three questions. No sign-up.

01 / Load calculations

Under the standard dwelling calculation, the general lighting, small-appliance, and laundry loads total 12,000 VA before demand factors. What is their demand load using 100% of the first 3,000 VA and 35% of the remainder?

  1. 4,200 VA
  2. 7,200 VA
  3. 12,000 VA
  4. 6,150 VA
Show answer & explanation

6,150 VA

Apply the dwelling demand factor to the combined eligible load: 3,000 + (9,000 × 0.35) = 6,150 VA. This does not apply the same factor to every load in the dwelling.

NEC 2023 Article 220, Part III (dwelling lighting demand factors); 220.52

02 / Load calculations

A dwelling has two required small-appliance branch circuits and one required laundry branch circuit. Before demand factors, what load do these circuits add to the dwelling calculation?

  1. 6,000 VA
  2. 1,500 VA
  3. 4,500 VA
  4. 3,000 VA
Show answer & explanation

4,500 VA

Include 1,500 VA for each of the two small-appliance circuits and 1,500 VA for the laundry circuit: three allowances total 4,500 VA.

NEC 2023 220.52(A) and (B)

03 / Load calculations

Four qualifying fastened-in-place dwelling appliances have nameplate loads of 1,200, 1,200, 1,600, and 2,000 VA. None is a range, dryer, space heater, or air conditioner. What load is permitted under the standard-method appliance demand rule?

  1. 6,000 VA
  2. 5,100 VA
  3. 4,500 VA
  4. 3,000 VA
Show answer & explanation

4,500 VA

The four qualifying appliances total 6,000 VA. Section 220.53 permits a 75% demand factor for four or more qualifying appliances, so the calculated load is 4,500 VA.

NEC 2023 220.53