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Advanced Load Calculations Flashcards

7 cards from real CME 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. A 4,000 sq ft retail store (NEC occupancy: stores) has 80 general-use duplex receptacles. Using NEC 220.14(H), what is the receptacle load?

    Answer: 14,400 VA

    NEC 220.14(H) counts each single or duplex receptacle outlet as 180 VA; 80 outlets × 180 VA = 14,400 VA.

  2. When calculating service entrance load for a large commercial building, NEC 220.87 permits sizing the service based on recorded maximum demand if the service capacity is at least:

    Answer: 125% of the recorded maximum demand

    NEC 220.87 requires that existing service capacity be at least 125% of the recorded maximum demand to use that data for load determination.

  3. A multi-family building has 40 electric ranges rated at 12 kW each. Per NEC Table 220.55, Column C, what is the total demand load?

    Answer: 55 kW

    NEC Table 220.55 Column C for 40 ranges gives a maximum demand of 55 kW.

  4. Per NEC 220.60, what percentage of the larger load is used when both an electric heating system and air conditioning system cannot operate simultaneously?

    Answer: 100% of the larger load only

    NEC 220.60 permits omitting the smaller of the heating or cooling load when they cannot operate simultaneously, using 100% of the larger load only.

  5. A 120/240V, 1-phase service supplies a dwelling with 24,000 VA total demand load. What is the calculated service entrance conductor ampacity?

    Answer: 100 A

    I = VA / V = 24,000 / 240 = 100 A; service entrance conductors must be rated for the full calculated load.

  6. When calculating the feeder load for a hospital operating room (NEC occupancy: hospitals), the general lighting unit load per NEC Table 220.12 is:

    Answer: 2.0 VA/sq ft

    NEC Table 220.12 lists hospitals at 2.0 VA per sq ft for general lighting load calculations.

  7. A 208Y/120V, 3-phase, 4-wire panel serves 30 A of balanced resistive lighting load per phase at 120V. What is the neutral current?

    Answer: 0 A

    A perfectly balanced 3-phase, 4-wire wye load produces zero neutral current because the phase currents cancel vectorially.