Practice Test Geeks(E2) E2 Commercial Electrical Inspector Practice Test
← All E2 Flashcard Decks

Commercial Service Load Calculations Flashcards

7 cards from real E2 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Commercial Service Load Calculations flashcards as text

  1. A commercial service feeds a 75 kVA transformer supplying secondary loads. What value is included in the service load calculation for this transformer?

    Answer: The actual connected and demand load on the secondary

    Service calculations use actual connected and demand loads on the secondary, not the transformer's rated capacity.

  2. A commercial building has electric resistance heating only with no cooling system. How must the heating load be treated in the service calculation?

    Answer: At 125% as a continuous load per NEC 215.2

    Electric heating that operates continuously for 3 or more hours is a continuous load and must be calculated at 125% per NEC 215.2.

  3. A retail mall tenant has 500 linear feet of show window frontage. What minimum load must be added to the service calculation per NEC 220.14(G)?

    Answer: 100,000 VA

    NEC 220.14(G) requires 200 VA per linear foot, so 500 × 200 = 100,000 VA.

  4. Which sequence correctly describes the standard commercial service load calculation method per NEC Article 220?

    Answer: Calculate each load category separately, apply applicable demand factors, then sum all loads

    The standard method requires calculating each load type separately, applying its specific demand factors, then totaling all loads.

  5. An inspector reviews plans where the designer omitted the 40-ton air conditioning load because the electric heating load is larger. Under what condition is this acceptable?

    Answer: Acceptable when heating and AC are non-coincident loads per NEC 220.60

    NEC 220.60 permits omitting the smaller of two non-coincident loads when they cannot reasonably operate simultaneously.

  6. A commercial parking lot has 20 pole-mounted luminaires each rated 400W. What load must be included in the service calculation?

    Answer: 10,000 VA at 125%

    Outdoor lighting operates continuously; 20 × 400W = 8,000W × 125% = 10,000 VA per NEC 215.2 continuous load rules.

  7. During plan review, an inspector finds a hotel service calculation using the 'all other occupancies' demand factors for lighting. Which NEC table provides the correct hotel-specific demand factors?

    Answer: NEC Table 220.42

    NEC Table 220.42 contains separate lighting demand factor rows specifically for hotels and motels.