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NEC Load Calculations (Article 220)
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What you’ll learn This quiz helps you practice NEC load calculations so you can estimate branch, feeder, and service demand accurately. The goal is to understand when to use connected load and when to apply demand factors. Real-world example A contractor sizing a dwelling service or a small commercial panel uses Article 220 to avoid undersizing or overspending. Many learners look for NEC load calculations, Article 220 practice, or dwelling load calculation quiz. Tip + common mistake Break the problem into categories before doing math: lighting, appliances, HVAC, and special loads. A... Show more
NEC Load Calculations (Article 220)
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15 Questions

1. (Difficulty: hard) Using the Optional Method (220.82), a dwelling has total general loads of 32,000 VA before HVAC. What is the demand load?
2. (Difficulty: medium) What is the demand load for a single household electric range rated at 14 kW per NEC Table 220.55?
3. (Difficulty: medium) What is the demand load for a single household electric range rated at 14 kW per NEC Table 220.55?
4. (Difficulty: hard) A 2,000 sq ft dwelling has the standard loads. Using the Standard Method, what is the demand load after applying Table 220.42 to the general lighting, small appliance, and laundry subtotal of 10,500 VA?
5. (Difficulty: medium) What is the general lighting load (before demand factors) for a 2,400 sq ft dwelling unit?
6. (Difficulty: medium) A 1,800 sq ft dwelling has two small appliance circuits, one laundry circuit, and uses the Standard Method. What is the total connected load (before demand factor) for general lighting, small appliance, and laundry circuits?
7. (Difficulty: medium) A dwelling has 4 fastened-in-place appliances: dishwasher (1,200 VA), disposal (900 VA), water heater (4,500 VA), and trash compactor (1,000 VA). What demand load applies?
8. (Difficulty: hard) The Optional Method (NEC 220.82) may be used for which of the following?
9. (Difficulty: hard) Using the Optional Method (220.82), a dwelling has total general loads of 32,000 VA before HVAC. What is the demand load?
10. (Difficulty: hard) A 2,000 sq ft dwelling has the standard loads. Using the Standard Method, what is the demand load after applying Table 220.42 to the general lighting, small appliance, and laundry subtotal of 10,500 VA?
11. (Difficulty: medium) A noncoincident heating load is 8 kW and the A/C load is 12 kW. What load is used for the feeder calculation?
12. (Difficulty: medium) Which loads are included when applying the Table 220.42 demand factor in the Standard Method?
13. (Difficulty: hard) A 30A continuous load is on a branch circuit. What minimum ampacity must the circuit conductors have?
14. (Difficulty: hard) The Optional Method (NEC 220.82) may be used for which of the following?
15. (Difficulty: hard) Using the Optional Method (220.82), what demand factor applies to the portion of general load above 10,000 VA?