Free NEC Code Basic Questions and Answers

Question 1

Every box, cabinet, or temperature fitting, such as a conduit body, must have electrical nonmetallic tubing secured within:

Accepted Answer

3 ft

Answer

4 ft

Answer

5 ft

Answer

6 ft

Question 2

Motor feeder tap conductors that are not more than ___ length must have an ampacity that is at least ten times the feeder protection device's rating.

Accepted Answer

10 ft

Answer

15 ft

Answer

20 ft

Answer

25 ft

Question 3

For the purpose of sizing branch circuits, an electric heater with a capacity of __ gallons or less is regarded as a continuous load:

Accepted Answer

120

Answer

100

Answer

150

Answer

180

Question 4

With more than three levels. Behind floors, walls, or ceilings with a ____ minute finish rating, ENT must be hidden:

Accepted Answer

15

Answer

12

Answer

30

Answer

25

Question 5

For connecting equipment or taps to luminaires, FMC Trade size 3/8 can be used in lengths no longer than :

Accepted Answer

6 ft

Answer

3 ft

Answer

4 ft

Answer

7 ft

Question 6

For a mast termination above the floor, RMC need not be firmly attached within __ of the service head:

Accepted Answer

3 ft

Answer

2.5 ft

Answer

4 ft

Answer

6 ft

Question 7

Ground fault protection for the overcurrent device for the primary feeder wires in marinas must not be greater than:

Accepted Answer

100mA

Answer

5mA

Answer

50mA

Answer

500mA

Question 8

The cord must contain a copper equipment grounding conductor that is not less than ____ and must end at a 
grounding type attachment plug for fixed or stationary equipment other than an underwater luminaire for 
permanently installed pools:

Accepted Answer

12 AWG

Answer

8 AWG

Answer

10 AWG

Answer

14 AWG

Question 9

Separately generated systems with a rating of __ or less are exempt from grounding requirements:

Accepted Answer

1 kVA

Answer

0.5 kVA

Answer

2 kVA

Answer

2.5 kVA

Question 10

The permissible ampacity for copper conductor of 10 AWG at 60° C is .

Accepted Answer

30 A

Answer

20 A

Answer

35 A

Answer

40 A