NEC Branch Circuit Requirements 2

Question 1

What is the maximum overcurrent protection allowed on a 14 AWG copper branch circuit conductor?

Accepted Answer

15 amperes

Answer

20 amperes

Answer

25 amperes

Answer

30 amperes

Question 2

A 20-ampere branch circuit supplying receptacles requires conductors of at least which size copper?

Accepted Answer

12 AWG

Answer

14 AWG

Answer

10 AWG

Answer

8 AWG

Question 3

On a multi-outlet branch circuit, the rating of any single cord-and-plug-connected utilization equipment must not exceed what percentage of the branch-circuit rating?

Accepted Answer

80%

Answer

50%

Answer

70%

Answer

100%

Question 4

What is the maximum rating of a branch circuit permitted to supply standard 15-ampere receptacles when more than one receptacle is on the circuit?

Accepted Answer

20 amperes

Answer

15 amperes

Answer

30 amperes

Answer

40 amperes

Question 5

Branch circuits rated 30 amperes are permitted to supply which type of load in a dwelling unit?

Accepted Answer

Fixed appliances and equipment only

Answer

General-use receptacles

Answer

Lighting outlets only

Answer

Any 15-amp receptacle

Question 6

Conductors of a branch circuit must have an ampacity not less than the maximum load to be served and not less than what for continuous loads?

Accepted Answer

125% of the continuous load

Answer

100% of the continuous load

Answer

115% of the continuous load

Answer

150% of the continuous load

Question 7

What is the minimum branch-circuit conductor size permitted for a 40-ampere branch circuit using copper?

Accepted Answer

8 AWG

Answer

10 AWG

Answer

6 AWG

Answer

4 AWG