Practice Questions: Demand Factor
Real questions from our bank, all referenced to NEC 2026. Tap “Show explanation” after you answer.
Using the standard method per NEC 220.12, what is the general lighting load in VA for a dwelling unit with 2,000 square feet of living space?
- A4,000 VA
- B5,000 VA
- C6,000 VA
- D8,000 VA
Show explanation
NEC Table 220.12 specifies 3 VA per sq ft for dwellings. 2,000 sq ft × 3 VA/sq ft = 6,000 VA.
Per NEC 220.52(A), each small-appliance branch circuit specified in 210.11(C)(1) shall be calculated at how many VA when determining feeder/service load?
- A1,200 VA
- B1,500 VA
- C1,800 VA
- D2,000 VA
Show explanation
NEC 220.52(A) requires each small-appliance circuit to be calculated at 1,500 VA for load calculations.
A dwelling has a general lighting load of 6,000 VA, two small-appliance circuits at 1,500 VA each, and one laundry circuit at 1,500 VA. Per NEC Table 220.42, the first 3,000 VA is calculated at 100% and the remainder at 35%. What is the demand load?
- A5,625 VA
- B6,675 VA
- C7,875 VA
- D10,500 VA
Show explanation
Total connected = 6,000 + 3,000 + 1,500 = 10,500 VA. Per Table 220.42: first 3,000 at 100% = 3,000; remainder (7,500) at 35% = 2,625. Demand = 5,625 VA.
Using the optional calculation method per NEC 220.82, what is the base load (in VA) that is applied at 100% before calculating the remainder at 40%?
- AFirst 8 kVA
- BFirst 10 kVA
- CFirst 12 kVA
- DFirst 15 kVA
Show explanation
NEC 220.82(B) applies the first 10 kVA of general loads at 100%, with the remainder at 40%.
Per NEC Table 220.55, what is the maximum demand load for one household cooking appliance (electric range) rated not more than 12 kW?
- A6 kW
- B8 kW
- C10 kW
- D12 kW
Show explanation
NEC Table 220.55 Column C specifies a maximum demand of 8 kW for one household electric range rated not more than 12 kW.
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