FREE NEC Wiring and Protection Questions and Answers

Question 1

According to NEC 2023, what is the minimum size copper equipment grounding conductor (EGC) required for a 60-ampere branch circuit protected by an overcurrent device?

Accepted Answer

10 AWG

Answer

12 AWG

Answer

8 AWG

Answer

6 AWG

Question 2

A 125-volt, 15-ampere receptacle is being installed to serve a kitchen countertop in a new residential dwelling. Which of the following is true regarding its protection requirements?

Accepted Answer

It requires both AFCI and GFCI protection.

Answer

It requires only overcurrent protection.

Answer

It requires only AFCI protection.

Answer

It does not require GFCI protection if it is more than 6 feet from the sink.

Question 3

In a commercial building, a 480/277V, 3-phase, 4-wire, solidly grounded wye service is installed. What is the MINIMUM depth of cover required for Rigid Metal Conduit (RMC) installed under a parking lot?

Accepted Answer

24 inches

Answer

6 inches

Answer

12 inches

Answer

18 inches

Question 4

Which of the following wiring methods is NOT permitted to be used for the ungrounded service-entrance conductors?

Accepted Answer

Flexible Metal Conduit (FMC)

Answer

Rigid Metal Conduit (RMC)

Answer

Electrical Metallic Tubing (EMT)

Answer

Type SE Cable

Question 5

An electrician is installing a new branch circuit in a dwelling unit laundry area. The circuit will supply a 120-volt receptacle for a washing machine. According to the 2023 NEC, what type of protection is required for this receptacle?

Accepted Answer

Both GFCI and AFCI protection

Answer

AFCI protection only

Answer

Overcurrent protection only

Answer

GFCI protection only

Question 6

When conductors are installed in a conduit that is exposed to direct sunlight on a rooftop, their ampacity must be adjusted for ambient temperature. If the ambient temperature is 30°C (86°F), what temperature adder must be applied to the ambient temperature for conduits located 1/2 inch above the rooftop?

Accepted Answer

17°C (30°F)

Answer

22°C (40°F)

Answer

33°C (60°F)

Answer

25°C (45°F)