Journeyman Electrician’s Exam Journeyman Electrician's General 4 — Questions and Answers
Question 1: What is the maximum overcurrent protection permitted for a 10 AWG copper conductor with 60°C terminations in a general wiring application?
- 20 amps
- 25 amps
- 30 amps (Correct answer)
- 35 amps
Correct answer: 30 amps
Per NEC 310.12 and Table 310.12, 10 AWG copper at 60°C is rated 30 amps, which is the maximum allowable overcurrent protection under NEC 240.4.
Question 2: Where must a disconnecting means be located relative to a motor in most installations?
- Within the motor control center only
- Within sight of the motor and the driven machinery (Correct answer)
- In the main electrical panel
- Within 50 feet of the motor
Correct answer: Within sight of the motor and the driven machinery
NEC 430.102(B) requires the motor disconnecting means to be in sight from the motor location and the driven machinery.
Question 3: Which of the following is an acceptable method of bonding a metal water pipe system to the electrical grounding system in a dwelling?
- Using a #14 AWG copper jumper connected to the neutral bar
- Using a #4 AWG copper bonding jumper connected to the grounding electrode system (Correct answer)
- Attaching the pipe to a grounded metal outlet box
- Water pipes do not need to be bonded to the electrical system
Correct answer: Using a #4 AWG copper bonding jumper connected to the grounding electrode system
NEC 250.104(A) requires bonding of interior metal water piping using a conductor sized per Table 250.102(C)(1), typically 4 AWG copper for a 200A service.
Question 4: According to NEC Article 210, what is the required arc-fault circuit interrupter (AFCI) protection location in a newly constructed dwelling for bedroom circuits?
- At the last outlet on the circuit
- At the first outlet on the branch circuit
- At the panel or at the first outlet of the branch circuit (Correct answer)
- AFCI is only required in kitchens and bathrooms
Correct answer: At the panel or at the first outlet of the branch circuit
NEC 210.12(A) requires AFCI protection and permits the device to be installed at the panel or at the first outlet when a listed outlet branch circuit AFCI is used.
Question 5: What is the voltage drop limit recommended by the NEC for a branch circuit serving sensitive electronic equipment?
- 1%
- 3% (Correct answer)
- 5%
- 10%
Correct answer: 3%
NEC 210.19(A) informational note recommends a maximum 3% voltage drop on branch circuits for efficiency and equipment protection.
Question 6: When sizing a service entrance for a dwelling, continuous loads must be calculated at what percentage of the actual load?
- 80%
- 100%
- 115%
- 125% (Correct answer)
Correct answer: 125%
NEC 230.42(A) requires service entrance conductors to have an ampacity not less than 125% of the continuous load plus 100% of non-continuous loads.
Question 7: In a panelboard, what is the maximum number of overcurrent devices (poles) permitted without a main breaker, according to the NEC's '6-disconnect rule'?
- 2
- 4
- 6 (Correct answer)
- 8
Correct answer: 6
NEC 230.71 allows up to six disconnects grouped in one location to serve as the service disconnecting means without requiring a single main breaker.
Journeyman Electrician’s Exam Journeyman Electrician's General 4
What is the maximum overcurrent protection permitted for a 10 AWG copper conductor with 60°C terminations in a general wiring application?