Journeyman Electrician's 2026 Edition Flashcards

What is the maximum length of a flexible cord used as a fixed wiring method in a dwelling unit per the 2023 NEC?

Answer: Flexible cords are not permitted as fixed wiring

The NEC prohibits the use of flexible cords as a substitute for fixed wiring in buildings under Article 400.12.

When sizing conductors for a continuous load, the conductor ampacity must be at least what percentage of the load?

Answer: 125%

Per NEC 210.19(A)(1), branch-circuit conductors must have an ampacity not less than 125% of the continuous load.

A 240V single-phase motor draws 18A at full load. What minimum size THWN copper conductor is required for its branch circuit (continuous load assumed)?

Answer: 10 AWG

18A × 125% = 22.5A; 10 AWG THWN copper is rated 35A and satisfies the 22.5A minimum requirement.

Which conduit type is NOT permitted for direct burial without concrete encasement?

Answer: Electrical Metallic Tubing (EMT)

EMT is not listed for direct burial; RMC, IMC, and Schedule 40 PVC are permitted for direct burial per NEC Table 300.5.

In a 3-phase 4-wire wye system, what is the voltage between any two hot conductors if the phase-to-neutral voltage is 120V?

Answer: 208V

Line-to-line voltage in a wye system equals phase voltage multiplied by √3, so 120V × 1.732 ≈ 208V.

What is the minimum burial depth for a branch circuit rated 120V or less supplying only lighting fixtures in a residential driveway?

Answer: 12 inches

Per NEC Table 300.5, direct-buried cables for 120V or less landscape/driveway lighting require a minimum 12-inch burial depth.

What device is required on a 15A or 20A, 125V receptacle installed in a crawl space at or below grade level?

Answer: GFCI protection

NEC 210.8(A) requires GFCI protection for all 15A and 20A, 125V receptacles in crawl spaces at or below grade.