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Load Calculations Flashcards

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  1. For a hotel or motel with 60 guest rooms, what demand factor does NEC Table 220.42 allow on lighting loads above 120,000 VA?

    Answer: 35%

    NEC Table 220.42 applies a 35% demand factor on lighting loads over 120,000 VA for hotels and motels without provisions for cooking.

  2. A 120V, 20A branch circuit supplies continuous loads only. What is the maximum allowable connected load in VA?

    Answer: 1,920 VA

    NEC 210.19(A) and 210.20 require continuous loads not exceed 80% of circuit rating; 120V × 20A × 80% = 1,920 VA.

  3. When calculating the service load for a dwelling using the standard method, small appliance and laundry circuits are included at what VA per circuit before demand factors?

    Answer: 1,500 VA

    NEC 220.52 requires each small appliance and laundry circuit to be counted at 1,500 VA before demand factors are applied.

  4. Per NEC 220.84, what percentage demand factor applies to the load of four or more dwelling units using the optional calculation method for multifamily buildings?

    Answer: See Table 220.84

    NEC 220.84 uses Table 220.84, which provides tiered demand factors based on the number of dwelling units (e.g., 45% for 5 units, decreasing further with more units).

  5. A 240V baseboard heater circuit serves 6,000 W of electric heating. Per NEC 424.3(B), conductors must be rated at what minimum ampacity?

    Answer: 31.25A

    Fixed electric heating is a continuous load; conductors must be rated at 125%: 6,000W ÷ 240V = 25A × 125% = 31.25A.

  6. What is the calculated demand load for 10 electric ranges each rated at exactly 8 kW in a multifamily building per NEC Table 220.55?

    Answer: 26,000 VA

    Table 220.55 Column B (ranges ≤ 8¾ kW) for 10 units = 26 kW demand (26,000 VA).

  7. Under NEC Article 220, what is the general lighting unit load (VA per sq ft) for a hospital?

    Answer: 3 VA/sq ft

    NEC Table 220.12 assigns 2 VA per square foot as the unit load for hospitals.