NEC - National Electrical Code Branch Circuit Requirements Questions and Answers

Question 1

According to NEC Article 210, which of the following locations in a dwelling unit requires Arc-Fault Circuit-Interrupter (AFCI) protection for all 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets and devices?

Accepted Answer

Kitchens

Answer

Garages

Answer

Bathrooms

Answer

Unfinished basements

Question 2

An electrician is wiring a new single-family home. What is the minimum requirement for the branch circuit supplying the receptacle outlets in the laundry area?

Accepted Answer

One 20A, 120V branch circuit dedicated solely to the laundry receptacle outlet(s).

Answer

One 15A, 120V branch circuit, which can also supply lighting.

Answer

Two 20A, 120V branch circuits shared with the kitchen.

Answer

One 15A, 240V branch circuit for the washer and dryer.

Question 3

A multi-outlet 20A branch circuit supplies both lighting outlets and fastened-in-place utilization equipment. What is the maximum permissible total rating of the fastened-in-place equipment?

Accepted Answer

10 amperes (50%)

Answer

20 amperes

Answer

16 amperes (80%)

Answer

15 amperes (75%)

Question 4

In a dwelling unit bathroom, a 20-ampere, 120-volt branch circuit is installed to supply the required receptacle outlet at the sink. According to NEC 210.11(C)(3), what else can this specific circuit supply?

Accepted Answer

Outlets for other equipment within the same bathroom, but only if the circuit supplies a single bathroom.

Answer

Receptacles in an adjacent bedroom.

Answer

The lighting outlets in the kitchen.

Answer

Any receptacle in any other bathroom in the house.

Question 5

Which of the following locations in a dwelling unit requires GFCI protection for all 125-volt through 250-volt receptacles supplied by single-phase branch circuits rated 150 volts or less to ground?

Accepted Answer

Basements (finished or unfinished)

Answer

Hallways

Answer

Bedrooms

Answer

Closets

Question 6

What is the minimum number of 20-ampere small-appliance branch circuits required to supply receptacle outlets in a dwelling unit kitchen?

Accepted Answer

Two

Answer

One

Answer

Three

Answer

Four