Practice Test Geeks(CME) Certified Municipal Engineer Practice Test
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Advanced Load Calculations Flashcards

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  1. A 3,600 sq ft dwelling has a 12 kW range. Using the NEC Table 220.55 demand factor, what is the demand load for the range?

    Answer: 8,400 W

    NEC Table 220.55 for a single range rated 12 kW (over 8.75 kW) uses Column C: 8 kW + 5% per kW over 12 kW, but for exactly 12 kW the demand is 8,400 W per the note (8 kW + 400 W).

  2. When calculating the demand load for electric dryers in a multi-family building with 25 units, which NEC table applies?

    Answer: Table 220.54

    NEC Table 220.54 provides demand factors for household electric dryers in multi-family and similar installations.

  3. A commercial building has a 200 kVA transformer supplying a 208Y/120V panel. What is the maximum continuous load in amps at 208V three-phase?

    Answer: 555 A

    I = kVA × 1000 / (V × √3) = 200,000 / (208 × 1.732) = 200,000 / 360.3 ≈ 555 A.

  4. Per NEC 220.82, the optional calculation method for dwelling units applies when the service or feeder does NOT exceed:

    Answer: 200 amperes

    NEC 220.82 optional method is available for dwelling units served by a single 3-wire, 120/240V or 208Y/120V service of 100 A or greater — the section covers existing or new 100 A+ services but is commonly applied up to 200 A service entries.

  5. A 480V, 3-phase motor has a nameplate full-load current of 40 A. What minimum feeder ampacity is required per NEC 430.22 for a single motor?

    Answer: 50 A

    NEC 430.22 requires the feeder to be sized at 125% of the motor FLC: 40 A × 1.25 = 50 A.

  6. For a school building, NEC 220.14(H) specifies the unit load per outlet for receptacle outlets in general-use spaces as:

    Answer: 180 VA per outlet

    NEC 220.14(H) specifies 180 VA per outlet for receptacle outlets in general-use spaces when the number of receptacles is not known.

  7. A 10,000 sq ft office building requires general lighting load calculation. Per NEC Table 220.12, the unit load for office occupancy is:

    Answer: 2.0 VA/sq ft

    NEC Table 220.12 lists office buildings at 3.5 VA per sq ft for general lighting — confirming the correct answer is 3.5 VA/sq ft.