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NEC Wiring and Protection Flashcards

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

Read the first 7 NEC Wiring and Protection flashcards as text

  1. Under NEC 225.30, how many sets of service-entrance conductors are generally allowed to supply a building from outside wiring?

    Answer: Only one, with limited exceptions

    NEC 225.30 generally limits a building to one set of feeder or branch-circuit conductors from outside unless specific exceptions apply.

  2. According to NEC 210.19(A), branch-circuit conductors must have an ampacity not less than what percentage of the continuous load plus the non-continuous load?

    Answer: 125% of continuous + 100% of non-continuous

    NEC 210.19(A) requires conductors to be sized at 125% of the continuous load plus 100% of the non-continuous load.

  3. Which wiring method is permitted in a Class I, Division 1 hazardous location per NEC Article 501?

    Answer: Rigid metal conduit (RMC) with explosionproof fittings

    In Class I, Division 1 locations, NEC 501.10(A) requires threaded rigid metal conduit or steel IMC with explosionproof fittings.

  4. Per NEC 334.15, where NM cable is run exposed on the surface of finished walls in a dwelling, it must follow the surface and be protected from:

    Answer: Physical damage in exposed or accessible locations

    NEC 334.15 requires NM cable run exposed on building surfaces to be protected from physical damage and to closely follow the surface.

  5. What is the maximum overcurrent protection permitted for a 12 AWG copper conductor on a general-purpose branch circuit per NEC 240.4(D)?

    Answer: 20 amperes

    NEC 240.4(D)(5) limits 12 AWG copper conductors to a maximum 20-ampere overcurrent device on general-purpose branch circuits.

  6. Under NEC 314.16, the volume of a box must be calculated to ensure adequate space for all conductors and devices. What determines the volume allowance for a device such as a switch or receptacle?

    Answer: Twice the volume of the largest conductor connected to it

    NEC 314.16(B)(4) requires each yoke or strap containing a device to be counted as two conductor volumes of the largest wire connected to that device.

  7. Per NEC 410.116, a recessed luminaire installed in a thermally insulated ceiling must be listed and labeled as:

    Answer: Type IC rated

    NEC 410.116(B) requires recessed luminaires installed with thermal insulation in contact to be listed and marked as Type IC (insulation contact) rated.