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NEC 2023 Code Questions Practice Test 17

Free NEC 2023 practice test with 30 questions on lighting fixtures, luminaires, and lampholders. Plain-English questions with full explanations.

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This NEC 2023 Code Questions Practice Test 17 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 17 — Question List

Question 1: Luminaires installed near combustible material must be constructed, installed, or equipped so that:

Combustible material is not damaged by heat
The fixture must be painted red
The fixture must be removed always
Nothing is required

NEC Reference: NEC 410.10(A)

Question 2: A surface-mounted incandescent or LED luminaire in a clothes closet must maintain a clearance from the storage space of at least:

12 inches
2 inches
36 inches
No clearance is needed

NEC Reference: NEC 410.16(A)

Question 3: A recessed luminaire in a clothes closet is permitted if it is:

Identified for closet installation
Any type at all, with no rules
Never permitted at all
Only battery-powered

NEC Reference: NEC 410.16(C)

Question 4: A luminaire located within the zone measured from a bathtub or shower must be:

Listed for damp or wet locations
Made of untreated wood
Not permitted anywhere near a bathroom
Only battery-powered candles

NEC Reference: NEC 410.10(D)

Question 5: A pendant luminaire must be supported by:

A means independent of the cord
The cord alone, always
Nothing, gravity holds it
Tape only

NEC Reference: NEC 410.62

Question 6: A recessed luminaire installed with thermal insulation nearby must have:

A Type IC listing or proper clearance
No rules apply at all
A garden hose nearby
A padlock

NEC Reference: NEC 410.116(B)

Question 7: For track lighting load calculations, each 2 feet of track length or fraction is generally considered:

150 volt-amperes
15 volt-amperes
1500 volt-amperes
0 volt-amperes

NEC Reference: NEC 220.43(B)

Question 8: Lighting track is generally not permitted to be installed:

In wet locations, unless listed
Where subject to physical damage
In every kitchen
Nowhere at all, it is always banned

NEC Reference: NEC 410.151(C)

Question 9: For a screw-shell lampholder, the grounded (neutral) conductor must be connected to:

The screw shell
The center contact only
Nothing, it floats free
The equipment ground only

NEC Reference: NEC 410.90

Question 10: When a luminaire is over 6 feet long, it must be supported at intervals not exceeding:

4 feet
1 foot
10 feet
20 feet

NEC Reference: NEC 410.36(E)

Question 11: Conductors entering a luminaire wiring compartment must be suitable for the temperature encountered, based on:

The temperature in the compartment
The color of the fixture
Nothing at all
The homeowner's guess

NEC Reference: NEC 410.68

Question 12: Splices and taps in a recessed luminaire must be accessible without removing the:

Luminaire from the outlet box
Ceiling of the entire house
Roof
Nothing needs access

NEC Reference: NEC 410.117

Question 13: A double-ended HID lamp fixture that could remain energized after a shield is opened needs:

A disconnecting means
Nothing at all
A padlock only
A sign only

NEC Reference: NEC 410.93

Question 14: A luminaire installed in a damp or wet location must be marked as suitable for that use, and:

Constructed to keep out moisture
Painted a bright color
Left uncovered always
Only used outdoors in summer

NEC Reference: NEC 410.10(A)

Question 15: A metal pole supporting an outdoor luminaire, over 8 feet tall, must have a grounding terminal and:

An accessible handhole
A locked box with no key
Nothing else
A garden gnome

NEC Reference: NEC 410.30(B)

Question 16: In a show window, listed, flexible-cord-connected luminaires are permitted without a fixed outlet box when:

Listed and rated for the use
Any random extension cord is used
Never permitted at all
Only during store hours

NEC Reference: NEC 410.14

Question 17: Luminaires may be used as a raceway to enclose conductors when they are:

Listed and marked for that purpose
Any fixture, with no listing
Never permitted
Made of cardboard

NEC Reference: NEC 410.64

Question 18: Replacement ballasts for fluorescent luminaires installed indoors must have:

A thermal protector
No safety device at all
A padlock
A wooden case

NEC Reference: NEC 410.130(E)

Question 19: An outlet box used to support a luminaire weighing more than 50 pounds must be:

Listed and marked for that weight
Made of plastic with no rating
Ignored, weight does not matter
Removed completely

NEC Reference: NEC 314.27(A)(2)

Question 20: An outlet box used to support a ceiling-suspended paddle fan must be:

Listed for fan support
Any general-purpose box
A cardboard box
Not required to hold any weight

NEC Reference: NEC 314.27(C)

Question 21: In a clothes closet, the storage space is defined as the volume extending from the floor to a height of:

6 feet or the highest shelf
1 foot always
20 feet always
There is no defined height

NEC Reference: NEC 410.2

Question 22: A luminaire that has a through-wiring feature can be used to carry conductors of circuits that supply:

The luminaires themselves
The entire building
Nothing, they cannot carry any conductors
A separate detached garage

NEC Reference: NEC 410.64(B)

Question 23: A recessed luminaire not identified for contact with insulation must be spaced at least what distance from combustible material?

1/2 inch
12 inches
0 inches, direct contact is fine
5 feet

NEC Reference: NEC 410.116(B)(1)

Question 24: A luminaire connected by cord and plug in accordance with the NEC must have the cord protected from:

Strain at the connection points
Nothing, cords never need protection
Being plugged in at all
Sunlight only

NEC Reference: NEC 410.62(C)

Question 25: A luminaire installed within a commercial cooking hood must be:

Listed for use within the hood
Any household fixture
Not permitted to exist at all
Made only of paper

NEC Reference: NEC 410.10(F)

Question 26: Emergency illumination must ensure that failure of one lighting element does not leave the area in:

Total darkness
Extra brightness
Color-changing light
No effect, this is not a rule

NEC Reference: NEC 700.16

Question 27: Egress path illumination is typically backed up by an emergency power source so lighting continues if:

Normal lighting fails
It is a sunny day
Nothing, it never activates
The building is empty

NEC Reference: NEC 700.16

Question 28: Exit signs required by a building or life safety code are generally supplied as part of the:

Emergency system
Decorative lighting circuit
Doorbell circuit
Nothing, they need no power

NEC Reference: NEC 700.16

Question 29: Secondary wiring for neon tube signs must be installed with attention to insulation because these circuits are:

High voltage
Low voltage always
Never energized
Only for decoration, no rules apply

NEC Reference: NEC 600.32

Question 30: Low-voltage lighting systems for landscaping generally operate at not more than:

30 volts
120 volts
480 volts
1000 volts

NEC Reference: NEC 411.3

NEC 2023 Code Questions Practice Test 17

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NEC 2023 Code Questions Practice Test 17

How this test works

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NEC 2023 Code Questions Practice Test 17 — Question List

Question 1: Luminaires installed near combustible material must be constructed, installed, or equipped so that:

Question 2: A surface-mounted incandescent or LED luminaire in a clothes closet must maintain a clearance from the storage space of at least:

Question 3: A recessed luminaire in a clothes closet is permitted if it is:

Question 4: A luminaire located within the zone measured from a bathtub or shower must be:

Question 5: A pendant luminaire must be supported by:

Question 6: A recessed luminaire installed with thermal insulation nearby must have:

Question 7: For track lighting load calculations, each 2 feet of track length or fraction is generally considered:

Question 8: Lighting track is generally not permitted to be installed:

Question 9: For a screw-shell lampholder, the grounded (neutral) conductor must be connected to:

Question 10: When a luminaire is over 6 feet long, it must be supported at intervals not exceeding:

Question 11: Conductors entering a luminaire wiring compartment must be suitable for the temperature encountered, based on:

Question 12: Splices and taps in a recessed luminaire must be accessible without removing the:

Question 13: A double-ended HID lamp fixture that could remain energized after a shield is opened needs:

Question 14: A luminaire installed in a damp or wet location must be marked as suitable for that use, and:

Question 15: A metal pole supporting an outdoor luminaire, over 8 feet tall, must have a grounding terminal and:

Question 16: In a show window, listed, flexible-cord-connected luminaires are permitted without a fixed outlet box when:

Question 17: Luminaires may be used as a raceway to enclose conductors when they are:

Question 18: Replacement ballasts for fluorescent luminaires installed indoors must have:

Question 19: An outlet box used to support a luminaire weighing more than 50 pounds must be:

Question 20: An outlet box used to support a ceiling-suspended paddle fan must be:

Question 21: In a clothes closet, the storage space is defined as the volume extending from the floor to a height of:

Question 22: A luminaire that has a through-wiring feature can be used to carry conductors of circuits that supply:

Question 23: A recessed luminaire not identified for contact with insulation must be spaced at least what distance from combustible material?

Question 24: A luminaire connected by cord and plug in accordance with the NEC must have the cord protected from:

Question 25: A luminaire installed within a commercial cooking hood must be:

Question 26: Emergency illumination must ensure that failure of one lighting element does not leave the area in:

Question 27: Egress path illumination is typically backed up by an emergency power source so lighting continues if:

Question 28: Exit signs required by a building or life safety code are generally supplied as part of the:

Question 29: Secondary wiring for neon tube signs must be installed with attention to insulation because these circuits are:

Question 30: Low-voltage lighting systems for landscaping generally operate at not more than:

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