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Conductors and Cables Flashcards

6 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 6 Conductors and Cables flashcards as text

  1. Per NEC Table 310.16, what is the ampacity of a 12 AWG THHN copper conductor at 30 degrees C ambient?

    Answer: 30 amperes

    NEC Table 310.16 lists 12 AWG THHN copper at 30 amperes in the 90 degrees C column.

  2. What is the maximum number of 12 AWG THHN conductors permitted in a 3/4-inch EMT conduit per NEC Chapter 9?

    Answer: 12

    Per NEC Chapter 9, Annex C, Table C1, a 3/4-inch EMT can hold up to 12 conductors of 12 AWG THHN.

  3. Per NEC 310.15(C)(1), what ampacity adjustment factor applies when 7-9 current-carrying conductors are in a single conduit?

    Answer: 70%

    NEC Table 310.15(C)(1) requires a 70% ampacity adjustment when 7-9 current-carrying conductors share a raceway.

  4. What is the minimum burial depth for UF cable installed under a residential driveway per NEC Table 300.5?

    Answer: 24 inches

    Per NEC Table 300.5, direct-buried UF cable under a one- and two-family dwelling driveway requires a minimum cover of 24 inches.

  5. Per NEC 334.80, what limitation applies to NM cable when installed in thermal insulation?

    Answer: Ampacity must be based on the 60 degrees C conductor rating

    NEC 334.80 requires that the ampacity of NM cable installed in thermal insulation be based on the 60 degrees C conductor temperature rating.

  6. What is the maximum voltage rating for Type NM cable per NEC 334.116?

    Answer: 600 volts

    NEC 334.116 states that NM cable shall be rated at 600 volts.