Previous NEC 2023 Code Questions Practice Test 13 Next NEC 2023 Code Questions Practice Test 15

NEC_PRACTICE NEC 2023

NEC 2023 Code Questions Practice Test 14

Free NEC 2023 practice test with 30 questions on electrical services, service equipment, and overcurrent protection basics. Plain-English questions with full explanations.

TOPICS COVERED

NEC Practice Tests

How this test works

Read each question carefully

Look for absolute words like always / never — they often distinguish the right answer.

Manage your time

You have 45 min for 30 questions. Skip tough ones and come back.

Progress is auto-saved

Your answers are saved locally — a page refresh won't lose your work.

Review your answers

After submitting you'll see every explanation and your NEC references.

How to Use This Practice Test

This NEC 2023 Code Questions Practice Test 14 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

Questions

45 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

NEC 2023 Code Questions Practice Test 14 — Question List

Question 1: For a one-family dwelling, the maximum number of service disconnects permitted is:

2
6
10
There is no limit

NEC Reference: NEC 230.71(A)

Question 2: Each service disconnect must be marked to show:

Its ampere rating
The installer's name
Nothing at all
The paint color

NEC Reference: NEC 230.79

Question 3: A service disconnect must be located at a:

Readily accessible location
Attic only
Locked closet with no key
Crawlspace only

NEC Reference: NEC 230.70(A)(1)

Question 4: Overhead service conductors above a roof generally need a vertical clearance of at least:

3 feet
8 feet
15 feet
25 feet

NEC Reference: NEC 230.24(A)

Question 5: A service mast used to support service drop conductors must be:

Strong enough for the strain
Made of any weak material
Left unsupported
Optional to install

NEC Reference: NEC 230.28

Question 6: Service cable exposed to physical damage must be protected by methods such as:

Rigid conduit
Tape only
Nothing at all
Paint

NEC Reference: NEC 230.50(A)

Question 7: For a grounded system, a connection to the grounding electrode system must be made at:

The service
A random branch circuit
The neighbor's panel
Nowhere is required

NEC Reference: NEC 250.24(A)

Question 8: Each ungrounded service conductor must have overcurrent protection sized based on its:

Ampacity
Color
Length only
Manufacturer name

NEC Reference: NEC 230.90(A)

Question 9: Which of these is a standard ampere rating for fuses and circuit breakers?

20 amperes
17 amperes
23 amperes
29 amperes

NEC Reference: NEC 240.6(A)

Question 10: Overcurrent devices must not be located in the vicinity of:

Bathrooms
Basements only
Garages only
Kitchens only

NEC Reference: NEC 240.24(E)

Question 11: Overcurrent devices must be installed so the center of the grip of the operating handle, when in its highest position, is not more than:

5 feet
6 feet 7 inches
8 feet
10 feet

NEC Reference: NEC 240.24(A)

Question 12: Series-rated circuit breaker combinations must be marked and selected according to:

Proper marking and evaluation
Guesswork
Color of the panel
No rules apply

NEC Reference: NEC 240.86

Question 13: Supplementary overcurrent protective devices are used inside:

Individual pieces of equipment
The main service only
Nothing at all
Utility poles

NEC Reference: NEC 240.10

Question 14: A lighting and appliance branch-circuit panelboard must be protected by an overcurrent device with a rating not more than:

The panelboard rating
Twice the panelboard rating
Any rating at all
Half the panelboard rating always

NEC Reference: NEC 408.36

Question 15: For sizes 6 AWG and smaller, the grounded (neutral) conductor is identified by a color of:

White or gray
Black
Red
Blue

NEC Reference: NEC 200.6(A)

Question 16: White or gray insulation must generally not be used for:

Ungrounded (hot) conductors
Equipment grounding conductors only
Grounded conductors
Nothing, there is no restriction

NEC Reference: NEC 200.7

Question 17: An insulated equipment grounding conductor 6 AWG or smaller is usually identified by the color:

Green
Orange
Brown
Pink

NEC Reference: NEC 250.119

Question 18: The grounded conductor connection to the grounding electrode conductor is generally made at:

Any accessible point ahead of the service disconnect
Only at the utility pole
Never allowed
Only inside a bedroom

NEC Reference: NEC 250.24(A)(1)

Question 19: A main bonding jumper connects the equipment grounding conductor to the:

Grounded conductor at the service
Telephone line
Gas pipe only
Nothing

NEC Reference: NEC 250.28

Question 20: A concrete-encased electrode (Ufer ground) generally must have at least what length of conductor or rebar?

10 feet
20 feet
30 feet
50 feet

NEC Reference: NEC 250.52(A)(3)

Question 21: A ground rod must be driven so that at least what length remains below grade?

The full rod length
Half of the rod
One inch
None, it can stick straight up

NEC Reference: NEC 250.53(G)

Question 22: Where two ground rods are used, they should be spaced at least:

6 feet apart
1 foot apart
50 feet apart
Touching each other

NEC Reference: NEC 250.53(A)(3)

Question 23: Metal water piping in a building must be bonded to:

The service equipment or grounding electrode system
Nothing at all
The nearest fence
A telephone pole

NEC Reference: NEC 250.104(A)

Question 24: A grounding electrode conductor may be made of:

Copper, aluminum, or copper-clad aluminum
Plastic only
Wood
Rubber

NEC Reference: NEC 250.62

Question 25: A grounding electrode conductor exposed to physical damage must be:

Protected, such as in a raceway
Left completely bare and exposed
Removed entirely
Painted red

NEC Reference: NEC 250.64(B)

Question 26: The bonding jumper size for the water piping system is based on:

The largest ungrounded service conductor
The pipe color
The homeowner's preference
Nothing, any size works

NEC Reference: NEC Table 250.66

Question 27: For equipment rated 0-150 volts to ground in Condition 1, the minimum working space depth is:

1 foot
3 feet
6 feet
10 feet

NEC Reference: NEC Table 110.26(A)(1)

Question 28: The width of the working space in front of electrical equipment must be at least:

12 inches
30 inches
60 inches
96 inches

NEC Reference: NEC 110.26(A)(2)

Question 29: The minimum headroom for working space around electrical equipment is generally:

5 feet
6 feet 6 inches
8 feet
10 feet

NEC Reference: NEC 110.26(E)

Question 30: Illumination must be provided for working spaces around service equipment rated:

1200 amperes or more
15 amperes or more
20 amperes or more
Any rating

NEC Reference: NEC 110.26(D)

NEC 2023 Code Questions Practice Test 14

How this test works

How to Use This Practice Test

Student Reviews

Leave a Review

NEC 2023 Code Questions Practice Test 14

How this test works

How to Use This Practice Test

Student Reviews

Leave a Review

NEC 2023 Code Questions Practice Test 14 — Question List

Question 1: For a one-family dwelling, the maximum number of service disconnects permitted is:

Question 2: Each service disconnect must be marked to show:

Question 3: A service disconnect must be located at a:

Question 4: Overhead service conductors above a roof generally need a vertical clearance of at least:

Question 5: A service mast used to support service drop conductors must be:

Question 6: Service cable exposed to physical damage must be protected by methods such as:

Question 7: For a grounded system, a connection to the grounding electrode system must be made at:

Question 8: Each ungrounded service conductor must have overcurrent protection sized based on its:

Question 9: Which of these is a standard ampere rating for fuses and circuit breakers?

Question 10: Overcurrent devices must not be located in the vicinity of:

Question 11: Overcurrent devices must be installed so the center of the grip of the operating handle, when in its highest position, is not more than:

Question 12: Series-rated circuit breaker combinations must be marked and selected according to:

Question 13: Supplementary overcurrent protective devices are used inside:

Question 14: A lighting and appliance branch-circuit panelboard must be protected by an overcurrent device with a rating not more than:

Question 15: For sizes 6 AWG and smaller, the grounded (neutral) conductor is identified by a color of:

Question 16: White or gray insulation must generally not be used for:

Question 17: An insulated equipment grounding conductor 6 AWG or smaller is usually identified by the color:

Question 18: The grounded conductor connection to the grounding electrode conductor is generally made at:

Question 19: A main bonding jumper connects the equipment grounding conductor to the:

Question 20: A concrete-encased electrode (Ufer ground) generally must have at least what length of conductor or rebar?

Question 21: A ground rod must be driven so that at least what length remains below grade?

Question 22: Where two ground rods are used, they should be spaced at least:

Question 23: Metal water piping in a building must be bonded to:

Question 24: A grounding electrode conductor may be made of:

Question 25: A grounding electrode conductor exposed to physical damage must be:

Question 26: The bonding jumper size for the water piping system is based on:

Question 27: For equipment rated 0-150 volts to ground in Condition 1, the minimum working space depth is:

Question 28: The width of the working space in front of electrical equipment must be at least:

Question 29: The minimum headroom for working space around electrical equipment is generally:

Question 30: Illumination must be provided for working spaces around service equipment rated:

Related Practice Tests