Licensed Electrical Contractor Licensed Electrical Contractor Branch Circuit Calculations Questions and Answers 2

Question 1

A 120V branch circuit supplies a 1,500W electric water heater. What is the minimum circuit ampere rating required per NEC Article 422?

Accepted Answer

20 amperes

Answer

15 amperes

Answer

25 amperes

Answer

30 amperes

Question 2

What is the maximum number of 180VA receptacle outlets permitted on a 20-ampere, 120-volt general-purpose branch circuit?

Accepted Answer

13

Answer

10

Answer

8

Answer

16

Question 3

When calculating branch circuit loads for a commercial kitchen, a 5,000W electric oven connected to a 240V single-phase circuit draws how many amperes?

Accepted Answer

20.83 amperes

Answer

24.0 amperes

Answer

26.04 amperes

Answer

30.0 amperes

Question 4

Per NEC 210.11(C)(3), a dwelling unit requires at least how many 20-ampere small-appliance branch circuits for the kitchen and dining areas?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 5

A 14 AWG copper conductor on a 15-ampere branch circuit can safely supply a maximum continuous load of how many amperes?

Accepted Answer

12 amperes

Answer

15 amperes

Answer

10 amperes

Answer

13.5 amperes

Question 6

For a multiwire branch circuit supplying line-to-neutral loads, the neutral conductor carries the unbalanced current. If Line A draws 12A and Line B draws 8A, what current flows on the neutral?

Accepted Answer

4 amperes

Answer

20 amperes

Answer

10 amperes

Answer

8 amperes