Practice Test Geeks(CEI) Certified Electrical Inspector Practice Test
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Commercial & Industrial Systems Flashcards

7 cards from real CEI 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 & Industrial Systems flashcards as text

  1. A factory has a 480V, 3-phase, 4-wire wye distribution system. What is the voltage between any two phase conductors?

    Answer: 480V

    In a 480V wye system, 480V is the line-to-line (phase-to-phase) voltage; the phase-to-neutral voltage is 277V.

  2. Which NEC section requires ground-fault circuit-interrupter (GFCI) protection for 125V, 15A and 20A receptacles in commercial bathrooms?

    Answer: 210.8(B)

    NEC 210.8(B) requires GFCI protection for receptacles in commercial and industrial bathrooms, among other locations.

  3. In a commercial occupancy, what is the demand factor applied to the first 3,000 VA of general lighting load per NEC Table 220.42?

    Answer: 100%

    NEC Table 220.42 applies a 100% demand factor to the first 3,000 VA of general lighting load in commercial occupancies.

  4. What does NEC 600.6 require for signs and outline lighting in commercial buildings regarding disconnecting means?

    Answer: An externally operable switch or circuit breaker within sight of the sign

    NEC 600.6(A) requires each sign and outline lighting system to have an externally operable switch or circuit breaker that opens all ungrounded conductors within sight of the sign.

  5. A commercial building has a 2,000A service. Per NEC 230.95, ground-fault protection of equipment (GFPE) is required for solidly grounded wye services of more than what voltage and ampere rating?

    Answer: 277V to ground, 1,000A

    NEC 230.95 requires GFPE for solidly grounded wye systems of more than 150V to ground but not exceeding 600V phase-to-phase, with disconnecting means rated 1,000A or more.

  6. In an industrial setting, a motor controller must be located within sight of the motor it controls OR what alternative is permitted?

    Answer: The controller may be out of sight if it can be locked in the open position

    NEC 430.87 permits the motor controller to be out of sight of the motor if the controller can be locked in the open (off) position.

  7. Under NEC Article 645, which condition exempts a computer room (Information Technology Equipment room) from standard wiring methods?

    Answer: All of the above conditions must be met

    NEC 645.4 requires all listed conditions—including disconnecting means, dedicated HVAC, and raised flooring—to be met before the special wiring rules of Article 645 apply.