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Special Occupancies & Hazardous Locations 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.

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  1. Which NEC article specifically governs electrical installations in Class I hazardous locations where flammable gases or vapors may be present?

    Answer: Article 501

    Article 501 covers Class I locations where flammable gases or vapors exist; Article 500 provides the general classification framework.

  2. According to the NEC, Class II hazardous locations are characterized by the presence of which hazardous substance?

    Answer: Combustible dust

    Class II locations are those in which combustible dust is or may be present in hazardous quantities, as defined in NEC Article 502.

  3. In the NEC Division classification system, what does 'Division 1' indicate about a hazardous location?

    Answer: The hazardous atmosphere can exist under normal operating conditions

    Division 1 means the hazardous atmosphere may be present under normal operating conditions, making it the more severe classification requiring more stringent equipment.

  4. NEC Article 517 provides electrical requirements for which type of special occupancy?

    Answer: Health care facilities

    Article 517 specifically addresses health care facilities, including hospitals, nursing homes, and limited care facilities, due to their unique patient safety requirements.

  5. Per NEC Section 680.22(A)(1), what is the minimum distance a 125-volt receptacle must be located from the inside wall of a permanently installed swimming pool?

    Answer: 6 feet

    NEC 680.22(A)(1) requires 125V receptacles to be located no closer than 6 feet from the inside walls of the pool to reduce shock hazard near water.

  6. Under NEC Article 511, the area up to 18 inches above the floor in a commercial garage is classified as which hazardous location?

    Answer: Class I, Division 2

    NEC 511.3 classifies the area up to 18 inches above the floor as Class I, Division 2 because gasoline vapors are heavier than air but adequate ventilation normally prevents hazardous concentrations.

  7. Which NEC article covers electrical requirements for places of assembly where 100 or more persons may gather?

    Answer: Article 518

    Article 518 covers places of assembly such as auditoriums, theaters, sports arenas, and similar occupancies where 100 or more persons congregate.