Journeyman Electrician’s Exam Journeyman Electrician's 4 — Questions and Answers
Question 1: What is the maximum length of a fixture whip made from flexible metal conduit connecting a luminaire to the branch circuit wiring?
- 3 feet
- 6 feet (Correct answer)
- 9 feet
- 12 feet
Correct answer: 6 feet
NEC 410.117(C) allows flexible metal conduit for fixture whips up to 6 feet in length within the cavity of a ceiling.
Question 2: Which NEC article covers the installation of electrical wiring in patient care areas of healthcare facilities?
- Article 500
- Article 517 (Correct answer)
- Article 520
- Article 550
Correct answer: Article 517
NEC Article 517 covers electrical installations in health care facilities, including patient care areas with specific grounding and wiring requirements.
Question 3: A 3-phase, 4-wire wye system has a line-to-line voltage of 208V. What is the line-to-neutral voltage?
- 104V
- 120V (Correct answer)
- 127V
- 240V
Correct answer: 120V
For a wye system, the line-to-neutral voltage equals the line-to-line voltage divided by the square root of 3 (√3): 208 ÷ 1.732 ≈ 120V.
Question 4: Under the NEC, which of the following conductors is NOT counted as a current-carrying conductor for conduit fill derating purposes?
- Ungrounded (hot) conductor
- Neutral conductor carrying only unbalanced load (Correct answer)
- Grounded neutral in a multi-wire branch circuit with non-linear loads
- Phase conductor
Correct answer: Neutral conductor carrying only unbalanced load
Per NEC 310.15(E), a neutral conductor that carries only the unbalanced current of a multi-wire branch circuit is not counted as a current-carrying conductor.
Question 5: What is the minimum height above a residential kitchen counter that an outlet must be installed?
- 12 inches
- 18 inches
- There is no minimum height specified — outlets must be within 24 inches of a counter edge (Correct answer)
- 30 inches
Correct answer: There is no minimum height specified — outlets must be within 24 inches of a counter edge
NEC 210.52(C)(1) requires counter top receptacles within 24 inches horizontally of the counter edge but does not specify a minimum height above the counter.
Question 6: For a 240-volt, single-phase residential air conditioner with a nameplate rating of 24 amperes, what is the minimum branch circuit conductor ampacity?
- 24 amps
- 30 amps (Correct answer)
- 40 amps
- 50 amps
Correct answer: 30 amps
NEC 440.32 requires branch circuit conductors for a single motor-compressor to be sized at 125% of the nameplate rated-load current: 24 × 1.25 = 30 amperes.
Question 7: What is the purpose of a bonding jumper at a service entrance?
- To increase the ampacity of the service conductors
- To connect the neutral conductor to the equipment grounding conductor and the enclosure (Correct answer)
- To reduce voltage drop
- To provide surge protection
Correct answer: To connect the neutral conductor to the equipment grounding conductor and the enclosure
The main bonding jumper connects the neutral (grounded) conductor to the equipment grounding conductor and the service enclosure, creating a fault return path per NEC 250.24(B).
Journeyman Electrician’s Exam Journeyman Electrician's 4
What is the maximum length of a fixture whip made from flexible metal conduit connecting a luminaire to the branch circuit wiring?