Journeyman Electrician’s Exam Journeyman Electrician's Branch Circuits 4 — Questions and Answers
Question 1: What is the maximum allowable cord-and-plug connected load on a 15-ampere receptacle outlet?
- 12 amperes (Correct answer)
- 15 amperes
- 10 amperes
- 13.5 amperes
Correct answer: 12 amperes
NEC 210.21(B)(2) limits the load on a 15-ampere receptacle to 12 amperes (80% of rating) for cord-and-plug connected loads.
Question 2: A branch circuit supplying a 10 kW, 240-volt electric range in a dwelling unit must have conductors rated at least:
- 40 amperes (Correct answer)
- 50 amperes
- 30 amperes
- 60 amperes
Correct answer: 40 amperes
Per NEC Table 220.55 and 210.19, a 10 kW range requires a minimum 40-ampere circuit with 8 AWG copper conductors.
Question 3: Which type of branch circuit is permitted to supply fixed electric space heating equipment?
- General-purpose branch circuit only
- Individual or general-purpose branch circuit, per NEC (Correct answer)
- Individual branch circuit only
- Dedicated feeder only
Correct answer: Individual or general-purpose branch circuit, per NEC
NEC 424.3 allows fixed electric space heating to be supplied by either an individual or general-purpose branch circuit.
Question 4: For a branch circuit supplying show window lighting in a commercial occupancy, the NEC requires a load calculation of at least:
- 180 VA per linear foot (Correct answer)
- 200 VA per outlet
- 3 VA per square foot
- 1500 VA per circuit
Correct answer: 180 VA per linear foot
NEC 220.14(G) requires show window lighting to be calculated at 180 VA per linear foot of show window.
Question 5: A 15-ampere, 125-volt duplex receptacle on a 20-ampere circuit is permissible when:
- Never; a 20A circuit requires 20A receptacles
- Two or more receptacles are on the circuit (Correct answer)
- The circuit serves a dedicated appliance
- Only in non-dwelling occupancies
Correct answer: Two or more receptacles are on the circuit
NEC 210.21(B)(3) permits 15-ampere receptacles on a 20-ampere circuit when two or more receptacles are installed.
Question 6: According to NEC 210.52, the maximum spacing between receptacle outlets along a wall in a dwelling unit living room is:
- 6 feet
- 10 feet
- 12 feet (Correct answer)
- 8 feet
Correct answer: 12 feet
NEC 210.52(A)(1) requires receptacles to be placed so no point along any wall is more than 6 feet from a receptacle, meaning spacing cannot exceed 12 feet between receptacles.
Question 7: A bathroom branch circuit in a dwelling unit that serves only bathroom receptacles must be rated:
- 15 amperes
- 20 amperes (Correct answer)
- 30 amperes
- Either 15 or 20 amperes
Correct answer: 20 amperes
NEC 210.11(C)(3) requires at least one 20-ampere branch circuit for bathroom receptacle outlets.
Journeyman Electrician’s Exam Journeyman Electrician's Branch Circuits 4
What is the maximum allowable cord-and-plug connected load on a 15-ampere receptacle outlet?