Journeyman Electricianâs Exam Journeyman Electrician's General 2 â Questions and Answers
Question 1: What is the maximum length of a flexible cord used as a substitute for fixed wiring in a dwelling unit?
- 6 feet
- There is no maximum length limit
- Flexible cord cannot be used as a substitute for fixed wiring (Correct answer)
- 10 feet
Correct answer: Flexible cord cannot be used as a substitute for fixed wiring
Per NEC 400.12, flexible cords and cables shall not be used as a substitute for the fixed wiring of a structure.
Question 2: According to the NEC, what is the minimum burial depth for a 120V residential branch circuit installed in a rigid metal conduit (RMC)?
- 6 inches (Correct answer)
- 12 inches
- 18 inches
- 24 inches
Correct answer: 6 inches
NEC Table 300.5 specifies a minimum cover of 6 inches for rigid metal conduit regardless of voltage for residential branch circuits.
Question 3: A 240V, single-phase motor draws 18 amps at full load. What is the minimum rating of the branch circuit conductors?
- 18 amps
- 20 amps
- 22.5 amps (Correct answer)
- 25 amps
Correct answer: 22.5 amps
NEC 430.22 requires branch circuit conductors for a single motor to have an ampacity of not less than 125% of the motor FLC: 18 Ă 1.25 = 22.5 amps.
Question 4: Which of the following is the correct color for a grounded (neutral) conductor in a 277/480V, 3-phase, 4-wire wye system?
- White
- Gray
- Green
- Either white or gray (Correct answer)
Correct answer: Either white or gray
NEC 200.6 permits white or gray insulation to identify the grounded conductor, and either is acceptable for any voltage system.
Question 5: What device is required by the NEC when a grounding electrode conductor is spliced?
- Wire nut rated for the wire size
- Listed irreversible compression connector or exothermic weld (Correct answer)
- Soldered butt splice
- Any listed connector
Correct answer: Listed irreversible compression connector or exothermic weld
NEC 250.64(C) requires grounding electrode conductor splices to be made with irreversible compression connectors or by exothermic welding.
Question 6: In a 3-phase, 4-wire, 120/208V system, what is the voltage measured between any two ungrounded (hot) conductors?
- 120V
- 208V (Correct answer)
- 240V
- 480V
Correct answer: 208V
In a wye-connected 120/208V system, the line-to-line voltage is 120V Ă â3 â 208V.
Question 7: According to the NEC, what is the maximum number of quarter-bends (360 degrees total) allowed between pull points in a conduit run?
- Two quarter-bends (180°)
- Three quarter-bends (270°)
- Four quarter-bends (360°) (Correct answer)
- Five quarter-bends (450°)
Correct answer: Four quarter-bends (360°)
NEC 358.26 (and similar for other raceways) limits bends between pull points to 360 degrees total â equivalent to four quarter-bends.
Journeyman Electricianâs Exam Journeyman Electrician's General 2
What is the maximum length of a flexible cord used as a substitute for fixed wiring in a dwelling unit?