Journeyman Electrician’s Exam Journeyman Electrician's Branch Circuits 2 — Questions and Answers
Question 1: What is the maximum load permitted on a 20-ampere branch circuit serving general lighting and receptacles?
- 16 amperes (Correct answer)
- 20 amperes
- 25 amperes
- 15 amperes
Correct answer: 16 amperes
NEC 210.19 limits continuous loads on a branch circuit to 80% of the circuit rating, so 20A × 0.80 = 16A maximum.
Question 2: A small appliance branch circuit in a kitchen must be rated at least:
- 15 amperes, 120 volts
- 20 amperes, 120 volts (Correct answer)
- 20 amperes, 240 volts
- 30 amperes, 120 volts
Correct answer: 20 amperes, 120 volts
NEC 210.11(C)(1) requires small appliance branch circuits to be 20-ampere, 120-volt circuits.
Question 3: Which NEC section governs the required number of branch circuits based on calculated load?
- 210.11 (Correct answer)
- 210.19
- 210.20
- 210.52
Correct answer: 210.11
NEC 210.11 specifies the minimum number of branch circuits required based on calculated load.
Question 4: A multiwire branch circuit sharing a neutral must have the ungrounded conductors on:
- The same phase
- Different phases or legs (Correct answer)
- Any available phase
- A dedicated neutral bus
Correct answer: Different phases or legs
NEC 210.4 requires multiwire branch circuit ungrounded conductors to be on different phases so the neutral carries only the unbalanced current.
Question 5: What is the minimum wire size required for a 20-ampere branch circuit using copper conductors?
- 14 AWG
- 12 AWG (Correct answer)
- 10 AWG
- 8 AWG
Correct answer: 12 AWG
NEC 210.19(A) requires 12 AWG copper as the minimum conductor size for a 20-ampere branch circuit.
Question 6: A branch circuit that serves only one piece of utilization equipment is called a(n):
- General-purpose circuit
- Individual branch circuit (Correct answer)
- Appliance branch circuit
- Dedicated circuit
Correct answer: Individual branch circuit
NEC Article 100 defines an individual branch circuit as one that supplies only one piece of utilization equipment.
Question 7: How many small appliance branch circuits are required in a dwelling unit kitchen per the NEC?
- One
- Two (Correct answer)
- Three
- Four
Correct answer: Two
NEC 210.11(C)(1) requires a minimum of two 20-ampere small appliance branch circuits in a dwelling unit.
Journeyman Electrician’s Exam Journeyman Electrician's Branch Circuits 2
What is the maximum load permitted on a 20-ampere branch circuit serving general lighting and receptacles?