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Load Calculation and Services Flashcards

7 cards from real Licensed Electrical Contractor 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. When applying the optional calculation method for a dwelling unit, what is the minimum load in volt-amperes applied to the first 10 kVA of all other loads?

    Answer: 100%

    Under NEC 220.82, the first 10 kVA of all other loads is calculated at 100%, with the remainder at 40%.

  2. A 240V, single-phase service feeds a 10 kW electric range. Using the standard calculation method, what demand load from NEC Table 220.55 applies for one range?

    Answer: 8 kW

    NEC Table 220.55, Column C specifies an 8 kW demand for a single household range rated up to 12 kW.

  3. What is the minimum size service required for a single-family dwelling under NEC 230.79?

    Answer: 100 amperes

    NEC 230.79(C) requires a minimum 100-ampere, 3-wire service for a single-family dwelling.

  4. When calculating feeder neutral load for a residential service, how is the unbalanced load between lines reduced per NEC 220.61?

    Answer: The portion of neutral load above 200A may be reduced by 70%

    NEC 220.61(B)(1) permits the neutral load above 200A to be multiplied by 70% for further reduction.

  5. A commercial occupancy has 50,000 VA of receptacle load. What demand factor applies to the receptacle load above 10,000 VA per NEC Table 220.44?

    Answer: 50%

    NEC Table 220.44 allows the receptacle load exceeding 10,000 VA to be calculated at 50% demand.

  6. Which NEC article governs services, including the number of service disconnects permitted?

    Answer: NEC Article 230

    NEC Article 230 covers services, including the rule that no more than six disconnecting means are permitted.

  7. When sizing a service for a building with multiple HVAC units, how are the hermetic refrigerant motor-compressor loads treated per NEC 440.6?

    Answer: At the rated-load current or branch-circuit selection current, whichever is greater

    NEC 440.6 requires using the rated-load current or branch-circuit selection current (whichever is larger) as the load for each hermetic compressor.