Journeyman Electrician Practice Test
Journeyman Electrician Branch Circuits, Feeders & Load Calculations Practice Questions
Branch Circuits, Feeders & Load Calculations makes up 6 of every 50 questions on a Tigertest Journeyman Electrician practice test. Here are 10 of the 24 questions on it, each with the answer and the reason.
Updated by the Tigertest team. Based on the 2023 National Electrical Code (NFPA 70) and standard electrical theory. Original questions; 50 per test, 70% to pass. State licensing law not included.
1. A branch circuit supplies 16 A of continuous load and nothing else. What is the minimum overcurrent device rating?
- A.15 A
- B.20 A
- C.16 A
- D.25 A
Answer: B. Continuous loads are sized at 125 percent: 16 x 1.25 = 20 A, and 20 A is a standard rating. A 15 A or 16 A device would be loaded past 80 percent continuously.
2. What is the largest single cord-and-plug load permitted on a 20 A receptacle?
- A.12 A
- B.15 A
- C.20 A
- D.16 A
Answer: D. A cord-and-plug-connected load on a 20 A receptacle may not exceed 80 percent of the receptacle rating, which is 16 A.
3. A kitchen countertop wall space must have a receptacle when it is at least this wide:
- A.12 in.
- B.24 in.
- C.6 in.
- D.18 in.
Answer: A. Every countertop and work surface wall space 12 in. or wider gets a receptacle outlet. Spaces narrower than that do not need one.
4. Which receptacle ratings are permitted on a 20 A general-purpose circuit with two or more receptacles?
- A.15 A only
- B.20 A or 30 A
- C.15 A or 20 A
- D.20 A only
Answer: C. On a multi-outlet 20 A circuit, receptacles rated 15 A or 20 A are allowed. A 30 A receptacle belongs on a 30 A circuit.
5. What is the minimum number of small-appliance branch circuits for a dwelling kitchen and dining area?
- A.Two 15 A circuits
- B.Three 20 A circuits
- C.Two 20 A circuits
- D.One 20 A circuit
Answer: C. At least two 20 A small-appliance branch circuits are required, and the countertop receptacles must be served by at least two of them.
6. The branch circuit supplying a dwelling's laundry receptacles must be rated:
- A.20 A
- B.30 A
- C.25 A
- D.15 A
Answer: A. At least one 20 A branch circuit is required for the laundry receptacle outlets, and it may not have other outlets. The dryer has its own separate circuit.
7. A 20 A circuit that supplies only bathroom receptacles may serve:
- A.Bathroom and bedroom outlets
- B.Only one bathroom's receptacles
- C.Bathroom and hallway outlets
- D.Receptacles in several bathrooms
Answer: D. A 20 A bathroom branch circuit may supply receptacles in more than one bathroom, or it may supply everything in a single bathroom. It may not pick up outlets in other rooms.
8. Along the floor line of a dwelling wall, no point may be farther than this from a receptacle:
- A.12 ft
- B.6 ft
- C.4 ft
- D.8 ft
Answer: B. Receptacles must be placed so that no point along the floor line of any wall space is more than 6 ft from a receptacle. That puts receptacles no more than 12 ft apart.
9. In the standard dwelling calculation, each small-appliance and laundry circuit is counted at:
- A.2,400 VA
- B.1,500 VA
- C.1,200 VA
- D.1,800 VA
Answer: B. Each 20 A small-appliance branch circuit and the laundry circuit are counted at 1,500 VA and added to the general lighting load before demand factors.
10. On a 20 A circuit that also supplies lighting or receptacles, fastened-in-place equipment may total no more than:
- A.8 A
- B.12 A
- C.16 A
- D.10 A
Answer: D. Fastened-in-place utilization equipment may not exceed 50 percent of the branch-circuit rating when the circuit also supplies lighting units or cord-connected equipment: 50 percent of 20 A is 10 A.
Practice all 24 branch circuits, feeders & load calculations questions, and the rest of the 200-question bank, in the free Journeyman Electrician training sets. Questions you miss come back until you have mastered them.
Start practicingFree to start. No account needed.