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NEC 2023 Code Questions Practice Test 13

Free NEC 2023 practice test with 30 questions on wiring methods, conduit, cable types, and appliances. Plain-English questions with full explanations.

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This NEC 2023 Code Questions Practice Test 13 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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45 min

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NEC 2023 Code Questions Practice Test 13 — Question List

Question 1: Liquidtight flexible metal conduit is often used to connect:

Motors and vibrating equipment
Overhead service drops only
Nothing, it has no use
Underground burial with no conduit

NEC Reference: NEC 350.10

Question 2: Type UF cable is designed for:

Direct burial underground
Indoor use only
It has no permitted use
Telephone wiring only

NEC Reference: NEC 340.10

Question 3: Type AC cable is generally permitted for:

Dry, indoor locations
Wet locations with no protection
Underground burial
It has no permitted use

NEC Reference: NEC 320.10

Question 4: Compared to Type AC cable, Type MC cable is permitted for direct burial when:

Listed for that use
It has no listed uses
Never, under any condition
Only in dry attics

NEC Reference: NEC 330.10

Question 5: A long PVC conduit run needs an expansion fitting when the expected length change is more than:

1/4 inch
2 inches
6 inches
1 foot

NEC Reference: NEC 352.44

Question 6: Rigid metal conduit is generally supported at intervals not more than:

5 feet
10 feet
15 feet
20 feet

NEC Reference: NEC 344.30

Question 7: The largest EMT trade size permitted by the NEC is:

2 inches
4 inches
6 inches
There is no limit

NEC Reference: NEC 358.20

Question 8: Conductors in a wireway must not fill more than what percent of the wireway area?

20 %
40 %
53 %
75 %

NEC Reference: NEC 376.22(A)

Question 9: An auxiliary gutter must not extend more than what distance beyond the equipment it supplements?

10 feet
30 feet
100 feet
There is no limit

NEC Reference: NEC 366.12

Question 10: Where flexibility is needed after installation, FMC can be left unsupported for up to:

3 feet
6 feet
10 feet
12 feet

NEC Reference: NEC 348.30(A)

Question 11: A storage-type water heater's overcurrent protection should not exceed what percent of the branch-circuit rating?

100 %
125 %
150 %
200 %

NEC Reference: NEC 422.11(E)

Question 12: A storage water heater of 120 gallons or less is treated, for circuit sizing, as a:

Continuous load
Momentary load
It is exempt from sizing rules
A non-continuous load, always

NEC Reference: NEC 422.13

Question 13: Every fixed appliance needs a way to disconnect it, which can be provided by:

A breaker, switch, or attachment plug
The nameplate alone
Nothing is ever required
A fused disconnect only

NEC Reference: NEC 422.30

Question 14: A built-in dishwasher may be cord-and-plug connected if the cord length is:

3 to 4 feet
6 to 8 inches
10 to 15 feet
Any length

NEC Reference: NEC 422.16(B)(1)

Question 15: A wall-mounted range hood may be cord-and-plug connected if the cord length is:

6 to 12 inches
18 to 36 inches
48 to 60 inches
Any length

NEC Reference: NEC 422.16(B)(4)

Question 16: Fixed electric heating equipment needs a disconnect that is within sight, or if not, is:

Lockable in the open position
Never required
Hidden inside the heater
In another building

NEC Reference: NEC 424.19

Question 17: A receptacle should not be mounted above a baseboard heater if the maker's instructions:

Prohibit that location
Are always ignored
Do not matter
Only cover paint color

NEC Reference: NEC 424.9

Question 18: A single electric range rated 12 kW or less generally has a demand load of:

6 kW
8 kW
10 kW
12 kW

NEC Reference: NEC Table 220.55

Question 19: Along a kitchen countertop, receptacles must be placed so no point is more than how far from an outlet?

12 inches
24 inches
48 inches
6 feet

NEC Reference: NEC 210.52(C)(1)

Question 20: Small appliance circuits must only supply kitchen and dining area receptacles, not:

Lighting outlets in another room
More kitchen receptacles
The refrigerator
The dining room table area

NEC Reference: NEC 210.52(B)(1)

Question 21: Central heating equipment must generally be supplied by:

An individual branch circuit
The kitchen circuit
Any lighting circuit
A shared water heater circuit

NEC Reference: NEC 210.11(C)(4)

Question 22: A multiwire branch circuit feeding devices on the same yoke needs a way to:

Disconnect all ungrounded conductors together
Disconnect only the neutral
Nothing extra is needed
Disconnect one wire at a time

NEC Reference: NEC 210.4(B)

Question 23: A continuous load is one where the maximum current continues for at least:

1 hour
3 hours
30 minutes
24 hours

NEC Reference: NEC Article 100

Question 24: "Readily accessible" means capable of being reached quickly, without:

Climbing over things or using a ladder
Asking for a key
Turning on a light
Opening a door

NEC Reference: NEC Article 100

Question 25: A feeder is the circuit conductors between the service equipment and:

The final branch-circuit overcurrent device
The street
A neighbor's house
Nothing

NEC Reference: NEC Article 100

Question 26: Dry-type transformer vent openings must not be blocked by:

Walls or other obstructions
Nothing, blocking is fine
Paint only
It does not matter

NEC Reference: NEC 450.9

Question 27: An autotransformer supplying a branch circuit needs overcurrent protection set at not more than what percent of rated input current?

125 %
250 %
400 %
No protection is needed

NEC Reference: NEC 450.4

Question 28: For sizing motor conductors, the full-load current should come from:

The NEC full-load current tables
The nameplate current, always
A guess
The panel rating

NEC Reference: NEC 430.6(A)(1)

Question 29: A motor has a full-load current of 16 amperes. What is the minimum branch-circuit conductor ampacity?

16 amperes
20 amperes
24 amperes
32 amperes

NEC Reference: NEC 430.22(A)

Question 30: A motor must be placed where it gets enough air flow and where maintenance can be:

Easily done
Never performed
Done only by the factory
Not a factor at all

NEC Reference: NEC 430.14(A)

NEC 2023 Code Questions Practice Test 13

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NEC 2023 Code Questions Practice Test 13

How this test works

How to Use This Practice Test

Student Reviews

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NEC 2023 Code Questions Practice Test 13 — Question List

Question 1: Liquidtight flexible metal conduit is often used to connect:

Question 2: Type UF cable is designed for:

Question 3: Type AC cable is generally permitted for:

Question 4: Compared to Type AC cable, Type MC cable is permitted for direct burial when:

Question 5: A long PVC conduit run needs an expansion fitting when the expected length change is more than:

Question 6: Rigid metal conduit is generally supported at intervals not more than:

Question 7: The largest EMT trade size permitted by the NEC is:

Question 8: Conductors in a wireway must not fill more than what percent of the wireway area?

Question 9: An auxiliary gutter must not extend more than what distance beyond the equipment it supplements?

Question 10: Where flexibility is needed after installation, FMC can be left unsupported for up to:

Question 11: A storage-type water heater's overcurrent protection should not exceed what percent of the branch-circuit rating?

Question 12: A storage water heater of 120 gallons or less is treated, for circuit sizing, as a:

Question 13: Every fixed appliance needs a way to disconnect it, which can be provided by:

Question 14: A built-in dishwasher may be cord-and-plug connected if the cord length is:

Question 15: A wall-mounted range hood may be cord-and-plug connected if the cord length is:

Question 16: Fixed electric heating equipment needs a disconnect that is within sight, or if not, is:

Question 17: A receptacle should not be mounted above a baseboard heater if the maker's instructions:

Question 18: A single electric range rated 12 kW or less generally has a demand load of:

Question 19: Along a kitchen countertop, receptacles must be placed so no point is more than how far from an outlet?

Question 20: Small appliance circuits must only supply kitchen and dining area receptacles, not:

Question 21: Central heating equipment must generally be supplied by:

Question 22: A multiwire branch circuit feeding devices on the same yoke needs a way to:

Question 23: A continuous load is one where the maximum current continues for at least:

Question 24: "Readily accessible" means capable of being reached quickly, without:

Question 25: A feeder is the circuit conductors between the service equipment and:

Question 26: Dry-type transformer vent openings must not be blocked by:

Question 27: An autotransformer supplying a branch circuit needs overcurrent protection set at not more than what percent of rated input current?

Question 28: For sizing motor conductors, the full-load current should come from:

Question 29: A motor has a full-load current of 16 amperes. What is the minimum branch-circuit conductor ampacity?

Question 30: A motor must be placed where it gets enough air flow and where maintenance can be:

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