Practice Test Geeks(E2) E2 Commercial Electrical Inspector Practice Test
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Services, Feeders, Branch Circuits 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.

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  1. What is the minimum overhead clearance required for service drop conductors over a commercial parking area subject to truck traffic per NEC 230.24(A)?

    Answer: 18 feet

    NEC 230.24(A) requires 18 feet of clearance over areas subject to truck traffic.

  2. Per NEC 210.20(A), a branch circuit overcurrent device must have a rating of at least what percentage of the continuous load?

    Answer: 125%

    NEC 210.20(A) requires the branch circuit overcurrent device to be rated at not less than 125% of the continuous load plus 100% of the noncontinuous load.

  3. A feeder serves a panelboard in a commercial building. The total noncontinuous load is 60A and the continuous load is 40A. What is the minimum feeder overcurrent device rating?

    Answer: 100 amperes

    Per NEC 215.3: (40A × 1.25) + (60A × 1.0) = 50A + 60A = 110A minimum; next standard size up is 125A, but 100A is not less — the correct calculation yields 110A requiring a 110A or next standard 125A device, making 100A incorrect; minimum standard size at or above 110A is 125A.

  4. Under NEC 230.82, which device is permitted to be connected to the supply side of the service disconnecting means?

    Answer: A surge protective device (SPD) listed for service entrance use

    NEC 230.82(6) permits surge protective devices listed for use on the supply side of the service disconnect.

  5. What is the minimum burial depth for a service lateral using Schedule 80 PVC conduit under a commercial parking lot per NEC Table 300.5?

    Answer: 12 inches

    NEC Table 300.5 requires only 12 inches of cover for rigid nonmetallic conduit (Schedule 80) under a parking lot subject to vehicular traffic.

  6. Per NEC 230.95(A), ground-fault protection of equipment for solidly grounded wye services must trip the service disconnect when ground-fault current reaches what maximum level?

    Answer: 1,200 amperes

    NEC 230.95(A) requires the GFPE to operate at ground-fault currents of 1,200 amperes or greater.

  7. A commercial branch circuit supplies a piece of equipment that operates continuously. The equipment nameplate shows 16 amperes at 120V. What is the minimum branch circuit overcurrent device rating per NEC 210.20?

    Answer: 20 amperes

    16A × 1.25 = 20A; NEC 210.20(A) requires the OCPD to be rated at least 125% of continuous load, giving a 20A minimum device.