Journeyman Electrician’s Exam Journeyman Electrician's 2 — Questions and Answers
Question 1: According to the NEC, what is the maximum number of current-carrying conductors allowed in a conduit before derating is required?
- 2
- 3 (Correct answer)
- 4
- 6
Correct answer: 3
The NEC allows up to 3 current-carrying conductors in a conduit without derating; more than 3 requires applying adjustment factors per Table 310.15(C)(1).
Question 2: A 20-ampere branch circuit receptacle outlet in a bathroom must be protected by which of the following?
- AFCI
- GFCI (Correct answer)
- Surge protector
- Double-pole breaker
Correct answer: GFCI
NEC 210.8 requires GFCI protection for all 125-volt, single-phase, 15- and 20-ampere receptacles in bathrooms.
Question 3: What is the minimum burial depth for a rigid metal conduit (RMC) under a residential driveway?
- 6 inches
- 12 inches (Correct answer)
- 18 inches
- 24 inches
Correct answer: 12 inches
NEC Table 300.5 requires RMC to be buried at least 6 inches under a residential driveway, but under a concrete slab (like a driveway) it is 6 inches; under regular driveways it's 12 inches for RMC.
Question 4: Which conductor color is reserved exclusively for ungrounded (hot) conductors in a 3-phase, 4-wire delta system with a high leg?
- Black
- Blue
- Orange (Correct answer)
- Red
Correct answer: Orange
NEC 230.56 and 408.3(F) require the high-leg conductor (which has a higher voltage to ground) to be identified with orange tape or insulation.
Question 5: What is the ampacity of a 10 AWG copper THHN conductor in free air at 60°C ambient?
- 30 amps
- 35 amps
- 40 amps
- 55 amps (Correct answer)
Correct answer: 55 amps
Per NEC Table 310.15(B)(17), a 10 AWG THHN copper conductor in free air at 60°C has an ampacity of 55 amperes.
Question 6: When installing a service panel, what is the maximum number of disconnecting means allowed at one location?
- 2
- 4
- 6 (Correct answer)
- 8
Correct answer: 6
NEC 230.71(A) limits the number of service disconnecting means to a maximum of six switches or sets of fuses.
Question 7: In which location is flexible metal conduit (FMC) NOT permitted to be used?
- As a fixture whip up to 6 feet
- In wet locations without additional protection (Correct answer)
- For vibration isolation at motors
- Above suspended ceilings
Correct answer: In wet locations without additional protection
NEC 348.12(2) prohibits FMC in wet locations unless the conductors are approved for wet locations and the installation ensures liquid-tight conditions.
Journeyman Electrician’s Exam Journeyman Electrician's 2
According to the NEC, what is the maximum number of current-carrying conductors allowed in a conduit before derating is required?