Previous NEC 2023 Code Questions Practice Test 4 Next NEC 2023 Code Questions Practice Test 6

NEC_PRACTICE NEC 2023

NEC 2023 Code Questions Practice Test 5

Free NEC 2023 practice test with 30 questions covering dwelling and non-dwelling GFCI protection, outdoor lighting circuit disconnects, minimum service disconnect ratings, separately derived system bonding, and cable clearance under metal roof decking. NEC 2023 references included.

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 5 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 5 — Question List

Question 1: What is the maximum voltage drop in branch conductor recommended by NEC ?

NEC Reference: NEC 210.19(A) Informational Note No. 4

Question 2: what is the minimum general lightening load required for 3500 square foot ware house as permitted by NEC ?

700 VA
3500 VA
7000 VA
4500 VA

NEC Reference: NEC 220.12

Question 3: If a 20 ampere AC snap switch is used to disconnect a 1.5 HP motor what must be the maximum full load current of a motor?

16 amperes
20 amperes
15 amperes
17 amperes

NEC Reference: NEC 430.109(C)(2)

Question 4: What is the maximum continuous load that can be connected to 240 volts 20 ampere branch circuit?

16 amperes
20 amperes
14 amperes
10 amperes

NEC Reference: NEC 210.20

Question 5: In a single family dwelling unit when four or more appliances are fastened in a place and connected to the same feeder then ....... percent demand factor can be applied in calculating total demand load.

NEC Reference: NEC 220.53

Question 6: What is the the minimum size copper wire that can be used for outside overhead wiring, if the wire carries more than 600 volts?

No. 6 AWG
No. 8 AWG
No. 10 AWG
No. 12 AWG

NEC Reference: NEC 225.6(A)(2)

Question 7: What is the maximum allowable voltage between two adjacent snap switches are receptacles placed in a enclosure?

300 volts
240 volts
480 volts
120 volts

NEC Reference: NEC 404.8(B)

Question 8: Which of the following is the smallest size fixture wire allowed?

No . 18 AWG
No . 12 AWG
No . 14 AWG
No . 20 AWG

NEC Reference: NEC 410.54(B)

Question 9: NEC 210.8 is divided into subsections covering GFCI requirements for dwelling units and for other than dwelling units. This split exists because:

Dwelling and non-dwelling occupancies have different requirements
GFCI is only required in dwelling units
GFCI is only required in commercial buildings
There is no meaningful distinction

NEC Reference: NEC 210.8

Question 10: Outdoor lighting equipment supplied by 277 or 480 volt circuits must have branch circuits arranged so that:

All ungrounded conductors are disconnected simultaneously
No disconnecting means is ever required
The neutral alone may be disconnected separately with no restriction
It does not matter how the circuits are arranged

NEC Reference: NEC 225.7(B)

Question 11: For installations not covered by the single-circuit, two-circuit, or one-family-dwelling rules of 230.79, the minimum service disconnect rating is:

60 amperes
15 amperes
30 amperes
200 amperes

NEC Reference: NEC 230.79(D)

Question 12: Certain conductor applications, such as motor circuit conductors and fixture wires, have overcurrent protection requirements found in their own specific articles rather than the general ampacity-based rule of 240.4. This exception is found in:

NEC 240.4(G)
NEC 90.1
NEC 110.3
No such exception exists

NEC Reference: NEC 240.4(G)

Question 13: For a separately derived system, such as the secondary of a transformer, the system bonding jumper must be installed:

At the source, or the first disconnect, but not both
At every downstream panel
It is never required for separately derived systems
Only at the far end of the circuit

NEC Reference: NEC 250.30(A)

Question 14: Bonding is required, as necessary, to ensure electrical continuity and the capacity to safely conduct:

Any fault current likely to be imposed
Only normal operating current
Nothing — bonding has no functional purpose
Only lightning current

NEC Reference: NEC 250.90

Question 15: Cables and raceways installed above a corrugated sheet metal roof decking, without additional support, must maintain a minimum distance of:

1 1/2 inches
1/4 inch
6 inches
No clearance is required

NEC Reference: NEC 300.4(E)

Question 16: When a pull box has more than one row of raceway entries, each row must be calculated:

Individually, using the largest raceway in that row
All rows are ignored except the first
Multiple rows are never permitted
Only the smallest raceway counts

NEC Reference: NEC 314.28(A)(3)

Question 17: Intermediate metal conduit (IMC) is prohibited from being used in which condition, unless supplementary corrosion protection is applied?

Severe corrosive influences
Any dry, indoor location
Standard residential closets
Above suspended ceilings

NEC Reference: NEC 342.14

Question 18: All cut ends of rigid metal conduit must be:

Reamed to remove rough edges
Left sharp for a tighter fitting connection
Never reamed, this is prohibited
Painted only, with no reaming

NEC Reference: NEC 344.28

Question 19: The NEC generally does not specify whether a receptacle must be installed with the grounding slot up or down, except where the receptacle or listing instructions require a specific orientation. What governs the correct orientation in that case?

The listing and manufacturer's installation instructions
There is never any requirement, ever
A coin flip
Local custom only, with no code basis

NEC Reference: NEC 406.5

Question 20: Panelboards must have circuits and circuit modifications arranged so as to avoid overloading of the:

Supply conductors or bus assembly
The building foundation
The homeowner's budget
Nothing, arrangement is irrelevant

NEC Reference: NEC 408.3(A)

Question 21: The fluorescent luminaire disconnecting means requirement of NEC 410.130(G) specifically applies to fixtures installed in:

Multiwire branch circuits with serviceable double-ended ballasts
Single-circuit installations only, with no exceptions
It applies to every luminaire regardless of type
It applies only to LED luminaires

NEC Reference: NEC 410.130(G)(1)

Question 22: A single branch-circuit breaker is permitted to serve as the disconnecting means for fixed electric space-heating equipment without an additional switch when:

It is within sight, or lockable in the open position
It is never permitted
It is located in a different building entirely
Any breaker anywhere in the building qualifies

NEC Reference: NEC 424.19(A)

Question 23: A time-delay fuse rated at not more than 125% of motor full-load current is permitted to be used for overload protection where the higher percentage overload relay setting from Table 430.32 is:

Not otherwise readily available or practical
Fuses are never permitted for motor overload
It has no bearing on the choice
Only for motors under 1/8 hp

NEC Reference: NEC 430.32(C)

Question 24: Air-conditioning or refrigerating equipment that uses a standard motor (not a hermetic motor-compressor) must be marked in accordance with:

Article 430
Article 500
Article 90
No marking requirement applies

NEC Reference: NEC 440.4(B)

Question 25: A two-wire, DC generator is permitted to have overcurrent protection provided in:

Only one conductor, under specific conditions
Both conductors, with no exception ever permitted
No conductor, DC generators are exempt entirely
The equipment grounding conductor only

NEC Reference: NEC 445.12(D)

Question 26: Dry-type transformers installed indoors and rated over 112.5 kVA must be separated from combustible material by a minimum of:

12 inches
1 inch
6 feet
No clearance is required

NEC Reference: NEC 450.21(A)

Question 27: Switches, circuit breakers, and motor controllers installed in a Class I, Division 1 location, with contacts that may produce arcs, must be provided with enclosures that are:

Identified/approved for the specific class and group (explosionproof)
Standard indoor plastic enclosures
Open, without any enclosure
Cardboard boxes for cost savings

NEC Reference: NEC 501.115(A)

Question 28: Listed or labeled equipment must be installed and used in accordance with:

Any instructions included in the listing or labeling
Whatever the installer prefers, ignoring instructions
No instructions ever apply
Only verbal instructions from the inspector

NEC Reference: NEC 110.3(B)

Question 29: Electrical equipment must be installed in a:

Neat and workmanlike manner
Any manner, quality is not addressed
Hidden manner only, regardless of quality
The fastest manner possible, regardless of appearance

NEC Reference: NEC 110.12

Question 30: The NEC is intended to be enforced and interpreted by the:

Authority having jurisdiction (AHJ)
Any homeowner, without qualification
No one, it is purely advisory
The equipment manufacturer only

NEC Reference: NEC 90.4

NEC 2023 Code Questions Practice Test 5

How this test works

How to Use This Practice Test

Student Reviews

Leave a Review

NEC 2023 Code Questions Practice Test 5

How this test works

How to Use This Practice Test

Student Reviews

Leave a Review

NEC 2023 Code Questions Practice Test 5 — Question List

Question 1: What is the maximum voltage drop in branch conductor recommended by NEC ?

Question 2: what is the minimum general lightening load required for 3500 square foot ware house as permitted by NEC ?

Question 3: If a 20 ampere AC snap switch is used to disconnect a 1.5 HP motor what must be the maximum full load current of a motor?

Question 4: What is the maximum continuous load that can be connected to 240 volts 20 ampere branch circuit?

Question 5: In a single family dwelling unit when four or more appliances are fastened in a place and connected to the same feeder then ....... percent demand factor can be applied in calculating total demand load.

Question 6: What is the the minimum size copper wire that can be used for outside overhead wiring, if the wire carries more than 600 volts?

Question 7: What is the maximum allowable voltage between two adjacent snap switches are receptacles placed in a enclosure?

Question 8: Which of the following is the smallest size fixture wire allowed?

Question 9: NEC 210.8 is divided into subsections covering GFCI requirements for dwelling units and for other than dwelling units. This split exists because:

Question 10: Outdoor lighting equipment supplied by 277 or 480 volt circuits must have branch circuits arranged so that:

Question 11: For installations not covered by the single-circuit, two-circuit, or one-family-dwelling rules of 230.79, the minimum service disconnect rating is:

Question 12: Certain conductor applications, such as motor circuit conductors and fixture wires, have overcurrent protection requirements found in their own specific articles rather than the general ampacity-based rule of 240.4. This exception is found in:

Question 13: For a separately derived system, such as the secondary of a transformer, the system bonding jumper must be installed:

Question 14: Bonding is required, as necessary, to ensure electrical continuity and the capacity to safely conduct:

Question 15: Cables and raceways installed above a corrugated sheet metal roof decking, without additional support, must maintain a minimum distance of:

Question 16: When a pull box has more than one row of raceway entries, each row must be calculated:

Question 17: Intermediate metal conduit (IMC) is prohibited from being used in which condition, unless supplementary corrosion protection is applied?

Question 18: All cut ends of rigid metal conduit must be:

Question 19: The NEC generally does not specify whether a receptacle must be installed with the grounding slot up or down, except where the receptacle or listing instructions require a specific orientation. What governs the correct orientation in that case?

Question 20: Panelboards must have circuits and circuit modifications arranged so as to avoid overloading of the:

Question 21: The fluorescent luminaire disconnecting means requirement of NEC 410.130(G) specifically applies to fixtures installed in:

Question 22: A single branch-circuit breaker is permitted to serve as the disconnecting means for fixed electric space-heating equipment without an additional switch when:

Question 23: A time-delay fuse rated at not more than 125% of motor full-load current is permitted to be used for overload protection where the higher percentage overload relay setting from Table 430.32 is:

Question 24: Air-conditioning or refrigerating equipment that uses a standard motor (not a hermetic motor-compressor) must be marked in accordance with:

Question 25: A two-wire, DC generator is permitted to have overcurrent protection provided in:

Question 26: Dry-type transformers installed indoors and rated over 112.5 kVA must be separated from combustible material by a minimum of:

Question 27: Switches, circuit breakers, and motor controllers installed in a Class I, Division 1 location, with contacts that may produce arcs, must be provided with enclosures that are:

Question 28: Listed or labeled equipment must be installed and used in accordance with:

Question 29: Electrical equipment must be installed in a:

Question 30: The NEC is intended to be enforced and interpreted by the:

Related Practice Tests