Licensed Electrical Contractor Branch Circuit Calculations 2

Question 1

A 20-ampere branch circuit serves a small appliance circuit in a kitchen. What is the maximum load, in watts, allowed on this circuit at 120V using the 80% rule?

Accepted Answer

1,920 watts

Answer

2,400 watts

Answer

1,600 watts

Answer

2,000 watts

Question 2

Per NEC Article 210, how many small appliance branch circuits are required for the kitchen countertop receptacle outlets in a dwelling unit?

Accepted Answer

At least two 20-ampere circuits

Answer

At least one 15-ampere circuit

Answer

At least three 20-ampere circuits

Answer

At least one 20-ampere circuit

Question 3

A branch circuit conductor must be sized so that voltage drop does not exceed what percentage for branch circuits per NEC recommendations?

Accepted Answer

3%

Answer

5%

Answer

2%

Answer

10%

Question 4

What is the minimum wire gauge (AWG) required for a 20-ampere, 120V branch circuit using copper conductors?

Accepted Answer

12 AWG

Answer

14 AWG

Answer

10 AWG

Answer

8 AWG

Question 5

A branch circuit supplies a 7.5 kVA, 240V single-phase motor load. What is the full-load current of this motor?

Accepted Answer

31.25 amperes

Answer

62.5 amperes

Answer

15.6 amperes

Answer

21.7 amperes

Question 6

What NEC section governs the maximum number of outlets permitted on a branch circuit in a commercial occupancy?

Accepted Answer

There is no NEC limit on number of outlets; load calculations govern

Answer

NEC 210.24 limits outlets to 10 per circuit

Answer

NEC 210.19 limits outlets to 13 per circuit

Answer

NEC 210.11 limits outlets to 8 per circuit

Question 7

For a branch circuit supplying a continuous load, the overcurrent protective device must be rated at no less than what percentage of the continuous load?

Accepted Answer

125%

Answer

80%

Answer

100%

Answer

115%