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NEC 2023 Code Questions Practice Test 15

Free NEC 2023 practice test with 30 questions on special occupancies, hazardous (classified) locations, and garages. Plain-English questions with full explanations.

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This NEC 2023 Code Questions Practice Test 15 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 15 — Question List

Question 1: A Class I hazardous location is one where flammable gases or vapors may be present in:

The air, in ignitable amounts
Solid dust piles only
Nowhere, it never applies
Only underwater

NEC Reference: NEC 500.5(B)

Question 2: A Class II hazardous location is made hazardous by the presence of:

Combustible dust
Flammable gas only
Water vapor
Nothing hazardous

NEC Reference: NEC 500.5(C)

Question 3: A Class III hazardous location involves the presence of:

Easily ignitible fibers or flyings
Flammable gas
Combustible dust clouds
Nothing at all

NEC Reference: NEC 500.5(D)

Question 4: In a Division 1 location, the hazardous condition exists:

Under normal operating conditions
Only during a fire
Never
Only once a year

NEC Reference: NEC 500.5(B)(1)

Question 5: Commercial garages used for repair and storage of self-propelled vehicles are covered by:

Article 511
Article 680
Article 210
Article 90

NEC Reference: NEC 511.3

Question 6: Wiring in a commercial garage above a hazardous area may be run in ordinary methods when it is:

Above the hazardous height
Underground and unprotected
Inside a fuel tank
It is never permitted

NEC Reference: NEC 511.4

Question 7: Wiring in spray application areas, like paint spray booths, is covered by:

Article 516
Article 250 only
Article 90 only
Nothing, it is not covered

NEC Reference: NEC 516.4

Question 8: A bulk storage plant, where flammable liquids are stored in tanks, is classified according to:

Article 515
Article 550
Article 600
Article 700

NEC Reference: NEC 515.3

Question 9: Gas stations, or motor fuel dispensing facilities, are covered by which NEC article?

Article 514
Article 800
Article 90
Article 300 only

NEC Reference: NEC 514.3

Question 10: The space around a fuel dispenser at a gas station within a set distance and height is classified as a:

Class I location
Ordinary, unclassified location
A wet location only
A damp location only

NEC Reference: NEC Table 514.3(B)(1)

Question 11: In hospital patient care spaces, branch circuits generally need redundant grounding, meaning:

Two separate grounding paths
No grounding at all
Only one path, ever
Grounding is optional

NEC Reference: NEC 517.13

Question 12: A hospital's essential electrical system is designed to keep power available during:

A normal power source outage
Only weekends
Only when it rains
It has no such purpose

NEC Reference: NEC 517.30

Question 13: In agricultural buildings with a corrosive atmosphere, wiring methods and equipment must be:

Suitable for a corrosive location
Made of bare paper
Left exposed with no protection
Not a concern at all

NEC Reference: NEC 547.5

Question 14: For carnivals, circuses, and fairs, receptacles supplying certain equipment must have:

GFCI protection
No protection required
AFCI protection only
A fuse box from 1950

NEC Reference: NEC 525.23

Question 15: A mobile home service disconnecting means is generally located:

Outside, near the mobile home
Inside a locked closet with no access
Underground with no cover
On the neighbor's property

NEC Reference: NEC 550.11

Question 16: Recreational vehicle park electrical wiring systems are covered under:

Article 551
Article 250
Article 90
Article 300

NEC Reference: NEC 551.71

Question 17: Feeders supplying marina power outlets often require ground-fault protection set to trip at not more than:

30 milliamperes
6 milliamperes
100 milliamperes
500 milliamperes

NEC Reference: NEC 555.35(B)

Question 18: At marinas, electrical connections must be located a set distance above the electrical datum plane, which is:

A reference water level used for clearance measurement
The bottom of the lake
A random point in the parking lot
It does not exist

NEC Reference: NEC 555.11

Question 19: Wiring for stage and platform switchboards in theaters is covered under:

Article 520
Article 90
Article 250 only
It is not covered

NEC Reference: NEC 520.5

Question 20: Each sign and outline lighting system needs a disconnecting means that opens:

All ungrounded conductors
Only the ground wire
Nothing, it stays on always
Only half the circuit

NEC Reference: NEC 600.6

Question 21: The disconnecting means for a sign must be located where it is:

Within sight or readily accessible
Inside the sign itself, hidden
A mile away
Nowhere, none is needed

NEC Reference: NEC 600.6(A)

Question 22: A single means of disconnect for elevator power and control circuits should be located:

In the machine room or accessible location
Inside the elevator car ceiling
On the roof with no access
Nowhere, it is not required

NEC Reference: NEC 620.51

Question 23: A wet-niche underwater luminaire operating at more than 15 volts must have ground-fault circuit-interrupter protection:

GFCI protection
No protection at all
A fuse from an old panel
A wooden cover only

NEC Reference: NEC 680.23(A)(4)

Question 24: Outlets supplying pool pump motors on branch circuits rated 15 or 20 amperes, 125 volt, single phase, must have:

GFCI protection
No requirement at all
A padlock only
A timer switch only

NEC Reference: NEC 680.21(C)

Question 25: The equipotential bonding grid around a pool is intended to:

Reduce voltage gradients
Add more voltage to the water
Decorate the pool
Nothing at all

NEC Reference: NEC 680.26(B)

Question 26: A general-purpose 125-volt receptacle must be located at least what horizontal distance from the pool edge?

3 feet
6 feet
10 feet
20 feet

NEC Reference: NEC 680.22(A)(1)

Question 27: A disconnecting means for a spa or hot tub must be readily accessible and located within sight, but not less than:

5 feet
1 foot
20 feet
50 feet

NEC Reference: NEC 680.41

Question 28: Electrical equipment for fountains operating at more than 15 volts must be protected by:

GFCI protection
No protection
A wooden barrier only
A sign only

NEC Reference: NEC 680.51(A)

Question 29: Indoor pool areas, or natatoriums, often have a corrosive atmosphere, which means equipment should be:

Suitable for a corrosive environment
Made of unprotected steel
Left exposed to chlorine gas with no rating
Not a concern

NEC Reference: NEC 680.23(F)

Question 30: Metal parts associated with a hydromassage bathtub circulation system must be bonded together using:

An 8 AWG bonding conductor
No bonding at all
Tape only
A wooden dowel

NEC Reference: NEC 680.74

NEC 2023 Code Questions Practice Test 15

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NEC 2023 Code Questions Practice Test 15

How this test works

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Student Reviews

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NEC 2023 Code Questions Practice Test 15 — Question List

Question 1: A Class I hazardous location is one where flammable gases or vapors may be present in:

Question 2: A Class II hazardous location is made hazardous by the presence of:

Question 3: A Class III hazardous location involves the presence of:

Question 4: In a Division 1 location, the hazardous condition exists:

Question 5: Commercial garages used for repair and storage of self-propelled vehicles are covered by:

Question 6: Wiring in a commercial garage above a hazardous area may be run in ordinary methods when it is:

Question 7: Wiring in spray application areas, like paint spray booths, is covered by:

Question 8: A bulk storage plant, where flammable liquids are stored in tanks, is classified according to:

Question 9: Gas stations, or motor fuel dispensing facilities, are covered by which NEC article?

Question 10: The space around a fuel dispenser at a gas station within a set distance and height is classified as a:

Question 11: In hospital patient care spaces, branch circuits generally need redundant grounding, meaning:

Question 12: A hospital's essential electrical system is designed to keep power available during:

Question 13: In agricultural buildings with a corrosive atmosphere, wiring methods and equipment must be:

Question 14: For carnivals, circuses, and fairs, receptacles supplying certain equipment must have:

Question 15: A mobile home service disconnecting means is generally located:

Question 16: Recreational vehicle park electrical wiring systems are covered under:

Question 17: Feeders supplying marina power outlets often require ground-fault protection set to trip at not more than:

Question 18: At marinas, electrical connections must be located a set distance above the electrical datum plane, which is:

Question 19: Wiring for stage and platform switchboards in theaters is covered under:

Question 20: Each sign and outline lighting system needs a disconnecting means that opens:

Question 21: The disconnecting means for a sign must be located where it is:

Question 22: A single means of disconnect for elevator power and control circuits should be located:

Question 23: A wet-niche underwater luminaire operating at more than 15 volts must have ground-fault circuit-interrupter protection:

Question 24: Outlets supplying pool pump motors on branch circuits rated 15 or 20 amperes, 125 volt, single phase, must have:

Question 25: The equipotential bonding grid around a pool is intended to:

Question 26: A general-purpose 125-volt receptacle must be located at least what horizontal distance from the pool edge?

Question 27: A disconnecting means for a spa or hot tub must be readily accessible and located within sight, but not less than:

Question 28: Electrical equipment for fountains operating at more than 15 volts must be protected by:

Question 29: Indoor pool areas, or natatoriums, often have a corrosive atmosphere, which means equipment should be:

Question 30: Metal parts associated with a hydromassage bathtub circulation system must be bonded together using:

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