Licensed Electrical Contractor Branch Circuit Calculations 3

Question 1

A 240V, single-phase branch circuit has a 30-ampere breaker. What is the maximum continuous load permitted on this circuit?

Accepted Answer

24 amperes

Answer

30 amperes

Answer

37.5 amperes

Answer

20 amperes

Question 2

Which NEC article specifically covers branch circuit requirements including ratings, outlet requirements, and conductor sizing?

Accepted Answer

Article 210

Answer

Article 230

Answer

Article 215

Answer

Article 220

Question 3

A bathroom branch circuit in a dwelling supplies two GFCI receptacles. Per NEC 210.11(C)(3), what is the minimum circuit rating required?

Accepted Answer

20 amperes

Answer

15 amperes

Answer

30 amperes

Answer

10 amperes

Question 4

When calculating branch circuit loads for general lighting in a store, what unit load in VA per square foot does the NEC Table 220.12 specify?

Accepted Answer

3.3 VA/sq ft

Answer

2 VA/sq ft

Answer

1.5 VA/sq ft

Answer

5 VA/sq ft

Question 5

A branch circuit conductor has a calculated voltage drop of 4.8V on a 120V circuit. What is the percentage voltage drop?

Accepted Answer

4%

Answer

2.4%

Answer

3%

Answer

5%

Question 6

What is the maximum overcurrent device rating permitted for a branch circuit supplying only lighting outlets per NEC 210.23?

Accepted Answer

20 amperes

Answer

15 amperes

Answer

30 amperes

Answer

50 amperes

Question 7

A 15-ampere, 120V branch circuit supplies receptacles in an office. Using the NEC demand factor for general-purpose receptacles, what load in VA is assigned to each receptacle?

Accepted Answer

180 VA

Answer

150 VA

Answer

200 VA

Answer

100 VA