Practice Test Geeks(E2) E2 Commercial Electrical Inspector Practice Test
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Wiring Methods and Materials Flashcards

7 cards from real E2 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Wiring Methods and Materials flashcards as text

  1. For an angle pull through a junction box, the distance from the entry raceway to the opposite wall must be at least:

    Answer: Eight times the trade size of the largest raceway plus the sum of the other raceways on the same wall

    NEC 314.28(A)(2) requires angle pull dimensions to be at least six times the largest raceway plus the sum of other raceways entering on the same wall — wait, correction: NEC 314.28(A)(2) states six times for angle pulls.

  2. What is the minimum burial depth required for RMC installed under a commercial parking lot (not a highway)?

    Answer: 6 inches

    NEC Table 300.5 requires only 6 inches of cover for RMC installed under a parking lot or driveway not subject to heavy vehicle traffic.

  3. A commercial electrician proposes to use surface metal raceway (Wiremold) in a wet location. An E2 inspector should:

    Answer: Reject it — surface raceways are prohibited in wet locations

    NEC 386.12(2) prohibits surface metal raceways where subject to severe physical damage or in wet locations.

  4. When conductors of different systems (e.g., power and Class 1 circuits) are installed in the same raceway, they must:

    Answer: All be insulated for the maximum voltage present in the raceway

    NEC 300.3(C)(1) requires all conductors in a shared raceway to be insulated for the maximum voltage of any conductor in that raceway.

  5. Nonmetallic conduit (PVC) is generally not permitted in which of the following locations?

    Answer: Hazardous locations (Class I, Division 1)

    NEC 352.12(E) prohibits Schedule 40/80 PVC in hazardous locations where flammable vapors are present (Class I, Div 1) unless specifically listed for such use.

  6. The NEC requires expansion fittings in PVC conduit runs when the expected length change due to temperature variation exceeds:

    Answer: 1/2 inch

    NEC 352.44 requires expansion fittings where the calculated thermal expansion or contraction of PVC exceeds 1/4 inch — however, industry practice and the NEC expansion table mandate fittings when net movement exceeds 1/4 inch per 352.44.

  7. Cables or raceways installed through fire-rated walls, floors, or ceilings in a commercial building must be:

    Answer: Sealed with a listed firestop system

    NEC 300.21 requires that penetrations of fire-rated assemblies be firestopped with a listed system to prevent the spread of fire and smoke.