Wiring Methods and Installation Flashcards
7 cards from real TN LLE 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 Installation flashcards as text
Type SE (Service Entrance) cable used for branch circuit or feeder wiring inside a building is governed by which NEC article?
Answer: NEC Article 338
Type SE cable — including its use for interior branch circuit and feeder wiring — is covered under NEC Article 338, Service Entrance Cable.
According to NEC Table 300.5, what is the minimum direct burial depth for Rigid Metal Conduit (RMC) installed underground (not encased in concrete)?
Answer: 6 inches
NEC Table 300.5 requires RMC installed as direct burial to have a minimum cover of 6 inches.
Per NEC 300.5(G), conduits or raceways that enter a building from underground must:
Answer: Be sealed or plugged to prevent moisture or gases from entering the structure
NEC 300.5(G) requires underground conduits entering a building to be sealed or plugged to prevent moisture or gases from traveling through the conduit into the building.
According to NEC 314.28(A)(1), the minimum dimension of a pull box used for straight pulls must be at least:
Answer: 8 times the trade diameter of the largest conduit entering the box
NEC 314.28(A)(1) requires that for straight pulls the minimum box dimension must be at least 8 times the trade size of the largest raceway entering the box.
Per NEC 358.26, what is the maximum total degrees of bends permitted in a single run of EMT between pull points?
Answer: 360 degrees
NEC 358.26 limits bends in any EMT run between pull points to not more than 360 degrees total, equivalent to four 90-degree bends.
According to NEC 334.12, Type NM cable is prohibited from being installed in which of the following locations?
Answer: Embedded in poured concrete or masonry
NEC 334.12(1) prohibits Type NM cable from being embedded in poured concrete, aggregate, or masonry because the jacket is not rated for such conditions.
NEC 300.3(B) requires that all conductors of the same circuit — including the grounded conductor and equipment grounding conductor — must be:
Answer: Contained within the same raceway, cable, or run together as a group
NEC 300.3(B) requires all conductors of the same circuit to be contained within the same cable or raceway to prevent inductive heating in metal enclosures.