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NEC 2023 Code Questions Practice Test 10

Free NEC 2023 practice test with 30 questions on surge protection, expanded GFCI rules, emergency disconnects, and grounding. Plain-English questions with full explanations.

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This NEC 2023 Code Questions Practice Test 10 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 2023 Code Questions Practice Test 10 — Question List

Question 1: A surge-protective device (SPD) is required at the service equipment for:

Dwelling unit services
Nothing, SPDs are never required
Only outdoor sheds
Only detached garages

NEC Reference: NEC 230.67

Question 2: Besides dwelling units, the SPD requirement in NEC 230.67 was expanded to also cover:

Hotel and motel guest rooms
Nothing was added
Only industrial warehouses
Only parking garages

NEC Reference: NEC 230.67

Question 3: In a dwelling kitchen, GFCI protection is required for all 125 through 250 volt receptacles, including those serving:

Refrigerators and disposals
Only the countertop
Nothing besides the counter
None of the kitchen

NEC Reference: NEC 210.8(A)(6)

Question 4: A receptacle within 6 feet of a wet bar sink in a dwelling requires:

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

NEC Reference: NEC 210.8(A)(9)

Question 5: One- and two-family dwellings need an emergency disconnect that is:

Outdoors and readily accessible
Hidden inside a locked closet
Not required at all
Located only in the attic

NEC Reference: NEC 230.85

Question 6: An emergency disconnect for a dwelling must be marked as:

"Emergency Disconnect"
No marking at all
Only a house number
The installer's name only

NEC Reference: NEC 230.85

Question 7: Under Condition 1, for equipment rated 0-150 volts to ground, the minimum working space depth is:

2 feet
3 feet
4 feet
6 feet

NEC Reference: NEC 110.26(A)(1)

Question 8: A service has 3/0 AWG copper conductors. What is the minimum copper grounding electrode conductor size?

8 AWG
6 AWG
4 AWG
2 AWG

NEC Reference: NEC 250.66

Question 9: A rod electrode must be at least:

4 feet
8 feet
12 feet
16 feet

NEC Reference: NEC 250.52(A)(5)

Question 10: 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 11: 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 12: What is the maximum standard overcurrent device rating for 14 AWG copper wire?

15 amperes
20 amperes
25 amperes
30 amperes

NEC Reference: NEC 240.4(D)(3)

Question 13: A motor has a full-load current of 24 amperes. What is the minimum branch-circuit conductor ampacity?

24 amperes
30 amperes
36 amperes
48 amperes

NEC Reference: NEC 430.22(A)

Question 14: What is the minimum service disconnect rating for a single-family dwelling?

60 amperes
100 amperes
150 amperes
200 amperes

NEC Reference: NEC 230.79(C)

Question 15: A panelboard is generally protected by an overcurrent device rated no higher than the panel, except when the panel is rated:

400 amperes or more
100 amperes or more
50 amperes or more
There is no exception

NEC Reference: NEC 408.36

Question 16: A circuit is protected by a 40 ampere breaker. What is the minimum copper equipment grounding conductor size?

14 AWG
12 AWG
10 AWG
8 AWG

NEC Reference: NEC 250.122

Question 17: Tamper-resistant receptacles are required for almost all:

Dwelling unit receptacles
Only outdoor receptacles
Only garage receptacles
None are required

NEC Reference: NEC 406.12

Question 18: A box in a wet location must be listed for the purpose and:

Prevent moisture buildup
Be left open
Be made of wood
It does not matter

NEC Reference: NEC 314.15

Question 19: A grounded conductor 6 AWG or smaller must be identified by:

White or gray
Black
Red
Blue

NEC Reference: NEC 200.6(A)

Question 20: All grounding electrodes present at a building must be:

Bonded together
Kept fully separate
Reduced to just one, and the rest removed
Ignored

NEC Reference: NEC 250.50

Question 21: AFCI protection is required for 120 volt, 15 and 20 ampere circuits in nearly all areas of:

A dwelling unit
Only garages
Only outdoors
AFCI is never required

NEC Reference: NEC 210.12(A)

Question 22: When more than 3 current-carrying conductors share a raceway, the ampacity must be:

Adjusted downward
Left unchanged
Increased
Doubled

NEC Reference: NEC Table 310.15(C)(1)

Question 23: The standard ampacity tables are based on an ambient temperature of:

0 C
30 C
60 C
90 C

NEC Reference: NEC 310.14

Question 24: A dwelling bathroom needs at least one 20 ampere circuit supplying only:

Bathroom receptacle outlets
The whole house
The garage
The kitchen

NEC Reference: NEC 210.11(C)(3)

Question 25: A motor has a normal (under 1.15) service factor. What is the maximum overload setting, as a percent of full-load current?

100 %
115 %
125 %
150 %

NEC Reference: NEC 430.32(A)(1)

Question 26: Every circuit at a panelboard must be identified on:

A circuit directory
Nothing, it is optional
The electric bill
A note to the buyer

NEC Reference: NEC 408.4(A)

Question 27: The minimum width of working space in front of equipment is:

24 inches
30 inches
36 inches
48 inches

NEC Reference: NEC 110.26(A)(2)

Question 28: NM cable must be supported at intervals not more than:

2 feet
4 1/2 feet
8 feet
10 feet

NEC Reference: NEC 334.30

Question 29: The disconnect for air-conditioning equipment must be located:

Within sight of the equipment
Hidden inside the unit
At the main panel only
Anywhere on the property

NEC Reference: NEC 440.14

Question 30: The equipotential bonding grid around a pool is used to reduce:

Voltage differences and shock risk
Water usage
Pool deck cracking
It has no safety purpose

NEC Reference: NEC 680.26(B)

NEC 2023 Code Questions Practice Test 10

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NEC 2023 Code Questions Practice Test 10

How this test works

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Student Reviews

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NEC 2023 Code Questions Practice Test 10 — Question List

Question 1: A surge-protective device (SPD) is required at the service equipment for:

Question 2: Besides dwelling units, the SPD requirement in NEC 230.67 was expanded to also cover:

Question 3: In a dwelling kitchen, GFCI protection is required for all 125 through 250 volt receptacles, including those serving:

Question 4: A receptacle within 6 feet of a wet bar sink in a dwelling requires:

Question 5: One- and two-family dwellings need an emergency disconnect that is:

Question 6: An emergency disconnect for a dwelling must be marked as:

Question 7: Under Condition 1, for equipment rated 0-150 volts to ground, the minimum working space depth is:

Question 8: A service has 3/0 AWG copper conductors. What is the minimum copper grounding electrode conductor size?

Question 9: A rod electrode must be at least:

Question 10: Each 14 AWG conductor in a box fill calculation needs a volume allowance of:

Question 11: In a dwelling living room, no point along the wall should be more than how far from a receptacle?

Question 12: What is the maximum standard overcurrent device rating for 14 AWG copper wire?

Question 13: A motor has a full-load current of 24 amperes. What is the minimum branch-circuit conductor ampacity?

Question 14: What is the minimum service disconnect rating for a single-family dwelling?

Question 15: A panelboard is generally protected by an overcurrent device rated no higher than the panel, except when the panel is rated:

Question 16: A circuit is protected by a 40 ampere breaker. What is the minimum copper equipment grounding conductor size?

Question 17: Tamper-resistant receptacles are required for almost all:

Question 18: A box in a wet location must be listed for the purpose and:

Question 19: A grounded conductor 6 AWG or smaller must be identified by:

Question 20: All grounding electrodes present at a building must be:

Question 21: AFCI protection is required for 120 volt, 15 and 20 ampere circuits in nearly all areas of:

Question 22: When more than 3 current-carrying conductors share a raceway, the ampacity must be:

Question 23: The standard ampacity tables are based on an ambient temperature of:

Question 24: A dwelling bathroom needs at least one 20 ampere circuit supplying only:

Question 25: A motor has a normal (under 1.15) service factor. What is the maximum overload setting, as a percent of full-load current?

Question 26: Every circuit at a panelboard must be identified on:

Question 27: The minimum width of working space in front of equipment is:

Question 28: NM cable must be supported at intervals not more than:

Question 29: The disconnect for air-conditioning equipment must be located:

Question 30: The equipotential bonding grid around a pool is used to reduce:

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