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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 410 governs luminaires. What is required for recessed luminaires installed in insulated ceilings if the luminaire is not rated for insulation contact (IC-rated)?

    Answer: A minimum 3-inch clearance between the luminaire and insulation must be maintained

    NEC 410.116(B) requires that non-IC-rated recessed luminaires maintain at least 3 inches of clearance from combustible materials and insulation.

  2. Under NEC Article 430 covering motors, what is the maximum rating of an inverse time circuit breaker used as the branch circuit short-circuit and ground-fault protective device for a motor with a full-load current of 20 amperes?

    Answer: 250% of FLA (50A)

    Per NEC 430.52 Table, an inverse time (standard) circuit breaker for motor branch-circuit protection may not exceed 250% of the motor's full-load ampere rating.

  3. NEC Article 440 addresses hermetic refrigerant motor-compressors. How is the branch-circuit selection current used for these appliances?

    Answer: It is used for sizing conductors and overcurrent protection when greater than the rated-load current

    NEC 440.4 states that branch-circuit selection current is used for conductor and overcurrent device sizing when it exceeds the rated-load current of the hermetic motor-compressor.

  4. For electric signs and outline lighting under NEC Article 600, what is the required minimum wire-bending space and clearance inside sign enclosures for field-installed conductors?

    Answer: Same as general wiring in Article 312 for cabinets

    NEC 600.31 requires that field-wiring compartments of sign enclosures comply with the wire-bending and gutter space requirements of Article 312 for cabinets and cutout boxes.

  5. Under NEC Article 645, information technology equipment rooms require a disconnecting means that can disconnect power to all equipment in the room. How must this disconnect be arranged?

    Answer: It must be operable from a location within the room and from a location outside the principal entrance

    NEC 645.10 requires IT equipment room disconnecting means to be operable from both inside the room and from a location outside the principal entrance.

  6. NEC Article 690 covers solar photovoltaic (PV) systems. What is the maximum voltage permitted for PV systems installed on or in one- and two-family dwellings?

    Answer: 600 volts

    NEC 690.7(A) limits the maximum PV system voltage to 600 volts for dwellings classified as one- and two-family residences.

  7. What does NEC Article 700 require regarding the transfer time for emergency systems when normal power is lost?

    Answer: Within 10 seconds

    NEC 700.12 requires that emergency systems supply illuminating and power needs within 10 seconds after normal power failure.