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NEC 2020 Code Questions Practice Test 12

Free NEC 2020 practice test with 30 questions on branch circuits, GFCI locations, load calculations, and box fill. Plain-English questions with full explanations.

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This NEC 2020 Code Questions Practice Test 12 has 30 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: Mixed-format test — questions jump between topics just like the real exam. Don't spend more than 90 seconds on any one question.

Topics covered: All NEC chapters — branch circuits, grounding, conductors, wiring methods, motors, and more.
Passing score: Aim for 80%+ consistently before scheduling your exam.
Questions: 30 multiple-choice, one correct answer each

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NEC 2020 Code Questions Practice Test 12 — Question List

Question 1: A branch circuit with two or more ungrounded conductors and a shared neutral is called a:

Multiwire branch circuit
Feeder
Service lateral
Tap conductor

NEC Reference: NEC Article 100

Question 2: A dwelling bathroom must have at least one 20 ampere branch circuit that supplies:

Only bathroom receptacle outlets
The whole house lighting
The kitchen and bathroom together
The garage

NEC Reference: NEC 210.11(C)(3)

Question 3: How many 20 ampere small appliance circuits are required in a dwelling kitchen?

One
Two
Three
Four

NEC Reference: NEC 210.11(C)(1)

Question 4: A dwelling unit must have at least one dedicated 20 ampere circuit for:

The laundry area
The living room
The attic
The garage door opener

NEC Reference: NEC 210.11(C)(2)

Question 5: A branch circuit supplies a continuous load of 16 amperes. What is the minimum conductor ampacity needed?

16 amperes
20 amperes
24 amperes
32 amperes

NEC Reference: NEC 210.19(A)(1)

Question 6: AFCI protection is required for 120 volt, 15 and 20 ampere circuits in a dwelling unit for:

Nearly all areas of the dwelling unit
Only the garage
Only outdoor circuits
AFCI is never required

NEC Reference: NEC 210.12(A)

Question 7: All 125 volt, 15 and 20 ampere receptacles in a dwelling bathroom need:

GFCI protection
No special protection
AFCI protection only
A metal cover only

NEC Reference: NEC 210.8(A)(1)

Question 8: Receptacles in a dwelling garage need:

GFCI protection
No special protection
AFCI protection only
A locked cover

NEC Reference: NEC 210.8(A)(2)

Question 9: Outdoor receptacles at a dwelling unit need:

GFCI protection
No special protection
AFCI protection only
A padlock

NEC Reference: NEC 210.8(A)(3)

Question 10: Receptacles in a dwelling crawl space at or below grade need:

GFCI protection
No special protection
AFCI protection only
A dedicated 50 ampere circuit

NEC Reference: NEC 210.8(A)(4)

Question 11: Receptacles in an unfinished basement need:

GFCI protection
No special protection
AFCI protection only
A dedicated neutral

NEC Reference: NEC 210.8(A)(5)

Question 12: Receptacles that serve the kitchen countertop need:

GFCI protection
No special protection
AFCI protection only
A dedicated 50 ampere circuit

NEC Reference: NEC 210.8(A)(6)

Question 13: For an interior stairway with six steps or more, a wall switch is needed at:

Each floor level
Only the top of the stairs
Only the bottom of the stairs
No switch is needed

NEC Reference: NEC 210.70(A)(2)

Question 14: A dwelling unit has 1000 square feet. What is the general lighting load, using 3 VA per square foot?

1000 VA
2000 VA
3000 VA
4000 VA

NEC Reference: NEC Table 220.12

Question 15: Each small appliance circuit is counted at what load value for service calculations?

500 VA
1000 VA
1500 VA
2000 VA

NEC Reference: NEC 220.52(A)

Question 16: The laundry branch circuit is counted at what load value for service calculations?

500 VA
1000 VA
1500 VA
2500 VA

NEC Reference: NEC 220.52(B)

Question 17: What is the minimum load used for a dwelling clothes dryer, unless the nameplate rating is higher?

3000 watts
4000 watts
5000 watts
6000 watts

NEC Reference: NEC 220.54

Question 18: When only one conductor is placed in a raceway, the maximum fill allowed is:

31 %
40 %
53 %
60 %

NEC Reference: NEC Chapter 9, Table 1

Question 19: When exactly two conductors are placed in a raceway, the maximum fill allowed is:

31 %
40 %
53 %
60 %

NEC Reference: NEC Chapter 9, Table 1

Question 20: Each 14 AWG conductor in a box fill calculation needs a volume allowance of:

1.5 in3
2.0 in3
2.25 in3
2.5 in3

NEC Reference: NEC Table 314.16(B)

Question 21: Each 10 AWG conductor in a box fill calculation needs a volume allowance of:

2.0 in3
2.25 in3
2.5 in3
3.0 in3

NEC Reference: NEC Table 314.16(B)

Question 22: Every circuit at a panelboard must be identified on:

A circuit directory
Nothing, labels are optional
A note left with the seller
The electric bill

NEC Reference: NEC 408.4(A)

Question 23: A grounded (neutral) conductor 6 AWG or smaller must be identified by which color?

Black
White or gray
Red
Blue

NEC Reference: NEC 200.6(A)

Question 24: An equipment grounding conductor is identified by which color?

Green, or green with a yellow stripe
Orange
White
Blue

NEC Reference: NEC 250.119

Question 25: An ungrounded (hot) conductor should not be colored:

White or green
Black
Red
Blue

NEC Reference: NEC 200.6

Question 26: A flexible cord must not be used as a substitute for:

The fixed wiring of a building
A portable lamp
A power tool
A holiday light string

NEC Reference: NEC 400.12

Question 27: In a dwelling living room, no point along the wall should be more than how far from a receptacle?

4 feet
6 feet
8 feet
10 feet

NEC Reference: NEC 210.52(A)(1)

Question 28: A dwelling hallway 10 feet long or more must have at least how many receptacles?

None
One
Two
Three

NEC Reference: NEC 210.52(H)

Question 29: A bathroom receptacle must be located within what distance of the outside edge of the basin?

1 foot
3 feet
6 feet
10 feet

NEC Reference: NEC 210.52(D)

Question 30: Tamper-resistant receptacles are required in which dwelling receptacles?

Almost all dwelling receptacles
Only outdoor receptacles
Only garage receptacles
None are required

NEC Reference: NEC 406.12

NEC 2020 Code Questions Practice Test 12

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NEC 2020 Code Questions Practice Test 12

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NEC 2020 Code Questions Practice Test 12 — Question List

Question 1: A branch circuit with two or more ungrounded conductors and a shared neutral is called a:

Question 2: A dwelling bathroom must have at least one 20 ampere branch circuit that supplies:

Question 3: How many 20 ampere small appliance circuits are required in a dwelling kitchen?

Question 4: A dwelling unit must have at least one dedicated 20 ampere circuit for:

Question 5: A branch circuit supplies a continuous load of 16 amperes. What is the minimum conductor ampacity needed?

Question 6: AFCI protection is required for 120 volt, 15 and 20 ampere circuits in a dwelling unit for:

Question 7: All 125 volt, 15 and 20 ampere receptacles in a dwelling bathroom need:

Question 8: Receptacles in a dwelling garage need:

Question 9: Outdoor receptacles at a dwelling unit need:

Question 10: Receptacles in a dwelling crawl space at or below grade need:

Question 11: Receptacles in an unfinished basement need:

Question 12: Receptacles that serve the kitchen countertop need:

Question 13: For an interior stairway with six steps or more, a wall switch is needed at:

Question 14: A dwelling unit has 1000 square feet. What is the general lighting load, using 3 VA per square foot?

Question 15: Each small appliance circuit is counted at what load value for service calculations?

Question 16: The laundry branch circuit is counted at what load value for service calculations?

Question 17: What is the minimum load used for a dwelling clothes dryer, unless the nameplate rating is higher?

Question 18: When only one conductor is placed in a raceway, the maximum fill allowed is:

Question 19: When exactly two conductors are placed in a raceway, the maximum fill allowed is:

Question 20: Each 14 AWG conductor in a box fill calculation needs a volume allowance of:

Question 21: Each 10 AWG conductor in a box fill calculation needs a volume allowance of:

Question 22: Every circuit at a panelboard must be identified on:

Question 23: A grounded (neutral) conductor 6 AWG or smaller must be identified by which color?

Question 24: An equipment grounding conductor is identified by which color?

Question 25: An ungrounded (hot) conductor should not be colored:

Question 26: A flexible cord must not be used as a substitute for:

Question 27: In a dwelling living room, no point along the wall should be more than how far from a receptacle?

Question 28: A dwelling hallway 10 feet long or more must have at least how many receptacles?

Question 29: A bathroom receptacle must be located within what distance of the outside edge of the basin?

Question 30: Tamper-resistant receptacles are required in which dwelling receptacles?

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