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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.

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  1. NEC Article 503 covers Class III locations. What makes a location Class III?

    Answer: Presence of easily ignitable fibers or flyings

    Class III locations are hazardous because of the presence of easily ignitable fibers or flyings, such as those found in textile mills.

  2. What NEC article governs electrical installations in theaters, audience areas of motion picture studios, and similar locations?

    Answer: Article 520

    NEC Article 520 covers electrical wiring and equipment installed in or about theaters, audience areas of motion picture studios, and similar locations.

  3. For swimming pools under NEC Article 680, what is the minimum required distance for overhead conductors (other than service drops) to clear the water's edge horizontally?

    Answer: 15 feet

    NEC 680.8 requires overhead conductors (other than service drops) to maintain a minimum 15-foot horizontal clearance from the edge of a swimming pool.

  4. Under NEC Article 680, luminaires installed in the wall of a permanently installed swimming pool must be at least how far below the normal water level?

    Answer: 12 inches

    NEC 680.22(B)(1) requires that luminaires installed in the walls of permanently installed pools be at least 18 inches below the normal water level.

  5. NEC Article 525 addresses carnivals, circuses, and fairs. What type of wiring method is prohibited for use as a flexible connection between equipment and supply in these temporary installations?

    Answer: Extension cords used as permanent wiring

    Extension cords must not be used as permanent or long-term wiring at carnivals, circuses, and fairs; listed flexible cords and cables suitable for hard or extra-hard usage are required.

  6. In a hospital operating room (Class I, Group C and D), what type of electrical system is required to prevent ignition hazards from anesthetic agents?

    Answer: Isolated power system with line isolation monitor

    NEC 517.160 requires isolated power systems with line isolation monitors in anesthetizing locations to limit fault current and reduce ignition risk.

  7. What NEC article covers electrical installations in marinas and boatyards?

    Answer: Article 555

    NEC Article 555 covers electrical installations in marinas, boatyards, and commercial and noncommercial docking facilities.