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Special Occupancies & Equipment Flashcards

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

Read the first 7 Special Occupancies & Equipment flashcards as text

  1. Under NEC Article 501, what class and division applies to a location where flammable gas or vapor is present in quantities sufficient to produce explosive mixtures during normal operations?

    Answer: Class I, Division 1

    Class I, Division 1 covers locations where ignitable concentrations of flammable gases or vapors can exist under normal operating conditions.

  2. NEC Article 502 governs Class II locations. Which of the following materials defines a Class II hazardous location?

    Answer: Combustible dusts

    Class II locations are hazardous because of the presence of combustible dust that may be suspended in the air.

  3. In a Class I, Division 2 location, which wiring method is NOT permitted by the NEC?

    Answer: Open wiring on insulators

    Open wiring on insulators is not an approved wiring method for Class I, Division 2 hazardous locations under NEC Article 501.

  4. According to NEC Article 511, commercial garages used for repair and storage of vehicles require special electrical treatment up to what height above the floor?

    Answer: 18 inches

    NEC 511.3 designates the area within 18 inches of the floor as Class I, Division 2 in commercial garages where flammable fuels are used.

  5. What does the NEC require for all 15- and 20-ampere, 125-volt receptacles in bathrooms of dwelling units per Article 210.8?

    Answer: GFCI protection

    NEC 210.8(A)(1) requires GFCI protection for all 15A and 20A, 125V receptacles installed in bathrooms of dwelling units.

  6. NEC Article 547 covers agricultural buildings. What special concern drives the unique wiring requirements in these structures?

    Answer: Excessive moisture, corrosive atmosphere, and presence of livestock

    Agricultural buildings present unique hazards including excessive moisture, corrosive environments from animal waste, and physical damage risks near livestock.

  7. Under NEC Article 517 for healthcare facilities, a 'critical branch' of the essential electrical system supplies power to which loads?

    Answer: Task illumination, special receptacles, and fixed equipment in patient care areas

    The critical branch of the essential electrical system in healthcare facilities supplies task illumination, specific receptacles, and fixed equipment serving patient care areas.