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NEC 2023 Code Questions Practice Test 11

Free NEC 2023 practice test with 30 questions on service equipment, bonding, wiring methods, and motor rules. Plain-English questions with full explanations.

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This NEC 2023 Code Questions Practice Test 11 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 11 — Question List

Question 1: As a general rule, a building may be supplied by:

Only one service
Always two services
As many as wanted
No limit at all

NEC Reference: NEC 230.2

Question 2: A service disconnect can consist of up to how many switches or breakers?

Four
Six
Eight
Ten

NEC Reference: NEC 230.71(A)

Question 3: A service raceway exposed to the weather must be:

Rain-tight and drained
Left open on top
Made of wood
It does not matter

NEC Reference: NEC 230.53

Question 4: Overhead service conductors must generally clear a roof by at least:

3 feet
8 feet
12 feet
18 feet

NEC Reference: NEC 230.24(A)

Question 5: The main bonding jumper is installed at:

The service equipment
Every downstream panel
The last outlet
The utility pole

NEC Reference: NEC 250.28

Question 6: Metal water piping in a building must be bonded to:

The service equipment or grounding system
Nothing
The water meter only
The heater only

NEC Reference: NEC 250.104(A)

Question 7: A service raceway has 4/0 AWG copper conductors. What size copper supply-side bonding jumper is needed?

4 AWG
2 AWG
1/0 AWG
3/0 AWG

NEC Reference: NEC 250.102(C)

Question 8: If a bored hole for cable is less than 1 1/4 inch from the framing edge, what protection is required?

A steel plate, 1/16 inch thick
Nothing extra
A layer of paint
A bigger hole

NEC Reference: NEC 300.4(A)(1)

Question 9: EMT must be supported at intervals not more than:

5 feet
10 feet
15 feet
20 feet

NEC Reference: NEC 358.30

Question 10: A direct-buried cable, not under a building, with no other protection, generally needs a burial depth of:

6 inches
12 inches
24 inches
36 inches

NEC Reference: NEC Table 300.5

Question 11: The smallest copper conductor allowed for general branch-circuit wiring is:

18 AWG
14 AWG
12 AWG
10 AWG

NEC Reference: NEC 310.4

Question 12: Which of the following is a standard fuse and breaker rating?

70 amperes
72 amperes
74 amperes
76 amperes

NEC Reference: NEC 240.6(A)

Question 13: What is the maximum standard overcurrent rating for a 12 AWG copper conductor?

15 amperes
20 amperes
25 amperes
30 amperes

NEC Reference: NEC 240.4(D)(5)

Question 14: A receptacle installed on a new branch circuit must be:

Grounding type
Non-grounding type
Either type
No type specified

NEC Reference: NEC 406.4(A)

Question 15: A switch handle must generally be mounted no higher than:

5 feet
6 feet 7 inches
8 feet
There is no limit

NEC Reference: NEC 404.8(A)

Question 16: A surface-mounted, fully-enclosed incandescent fixture in a clothes closet needs a clearance from storage of:

6 inches
12 inches
24 inches
36 inches

NEC Reference: NEC 410.16

Question 17: A feeder for several motors must be sized using the largest motor at 125%, plus:

The other motors' full-load currents
Nothing else
A flat 10 amperes
Building square footage

NEC Reference: NEC 430.24

Question 18: The disconnect for AC equipment must be located:

Within sight of the equipment
Hidden inside the unit
At the main panel only
Anywhere on the property

NEC Reference: NEC 440.14

Question 19: A dry-type transformer over 112.5 kVA, installed indoors, must be kept away from combustibles by at least:

1 inch
12 inches
6 feet
No separation needed

NEC Reference: NEC 450.21(A)

Question 20: Class I hazardous locations are divided into which groups?

Groups A, B, C, and D
Groups 1 and 2
Groups E, F, and G
There are no groups

NEC Reference: NEC 500.6(A)

Question 21: A portable generator that only supplies equipment mounted on the generator needs:

No separate grounding electrode
A dedicated ground rod always
It cannot be grounded at all
A bond to gas piping

NEC Reference: NEC 250.34(A)

Question 22: A mobile home service disconnect needs a minimum rating of:

30 amperes
50 amperes
100 amperes
200 amperes

NEC Reference: NEC 550.32(A)

Question 23: A flexible cord for a pool pump motor must not be longer than:

3 feet
6 feet
10 feet
15 feet

NEC Reference: NEC 680.21

Question 24: Emergency systems must be tested from time to time, with records kept by:

The building owner
The fire department
The utility company
No testing is required

NEC Reference: NEC 700.3

Question 25: Which of these is a wiring method permitted for service-entrance conductors?

Rigid metal conduit
Open knob-and-tube wiring
Bare wire in open air
A garden hose

NEC Reference: NEC 230.43

Question 26: A cartridge fuse must be marked with the ampere rating and:

Voltage rating
The buyer's name
Nothing else
The store name

NEC Reference: NEC 240.60(D)

Question 27: Overcurrent devices must be located where they are:

Readily accessible
Locked with no key
Buried in concrete
It does not matter

NEC Reference: NEC 240.24(A)

Question 28: Where the grounding electrode conductor connects only to a rod electrode, it need not be larger than:

6 AWG copper
2 AWG copper
14 AWG copper
There is no cap

NEC Reference: NEC 250.66(A)

Question 29: Where the grounding electrode conductor connects only to a concrete-encased electrode, it need not be larger than:

4 AWG copper
2/0 AWG copper
14 AWG copper
There is no cap

NEC Reference: NEC 250.66(B)

Question 30: For a general motor, a dual-element (time-delay) fuse is generally capped at what percent of full-load current?

150 %
175 %
250 %
300 %

NEC Reference: NEC Table 430.52

NEC 2023 Code Questions Practice Test 11

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NEC 2023 Code Questions Practice Test 11

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NEC 2023 Code Questions Practice Test 11 — Question List

Question 1: As a general rule, a building may be supplied by:

Question 2: A service disconnect can consist of up to how many switches or breakers?

Question 3: A service raceway exposed to the weather must be:

Question 4: Overhead service conductors must generally clear a roof by at least:

Question 5: The main bonding jumper is installed at:

Question 6: Metal water piping in a building must be bonded to:

Question 7: A service raceway has 4/0 AWG copper conductors. What size copper supply-side bonding jumper is needed?

Question 8: If a bored hole for cable is less than 1 1/4 inch from the framing edge, what protection is required?

Question 9: EMT must be supported at intervals not more than:

Question 10: A direct-buried cable, not under a building, with no other protection, generally needs a burial depth of:

Question 11: The smallest copper conductor allowed for general branch-circuit wiring is:

Question 12: Which of the following is a standard fuse and breaker rating?

Question 13: What is the maximum standard overcurrent rating for a 12 AWG copper conductor?

Question 14: A receptacle installed on a new branch circuit must be:

Question 15: A switch handle must generally be mounted no higher than:

Question 16: A surface-mounted, fully-enclosed incandescent fixture in a clothes closet needs a clearance from storage of:

Question 17: A feeder for several motors must be sized using the largest motor at 125%, plus:

Question 18: The disconnect for AC equipment must be located:

Question 19: A dry-type transformer over 112.5 kVA, installed indoors, must be kept away from combustibles by at least:

Question 20: Class I hazardous locations are divided into which groups?

Question 21: A portable generator that only supplies equipment mounted on the generator needs:

Question 22: A mobile home service disconnect needs a minimum rating of:

Question 23: A flexible cord for a pool pump motor must not be longer than:

Question 24: Emergency systems must be tested from time to time, with records kept by:

Question 25: Which of these is a wiring method permitted for service-entrance conductors?

Question 26: A cartridge fuse must be marked with the ampere rating and:

Question 27: Overcurrent devices must be located where they are:

Question 28: Where the grounding electrode conductor connects only to a rod electrode, it need not be larger than:

Question 29: Where the grounding electrode conductor connects only to a concrete-encased electrode, it need not be larger than:

Question 30: For a general motor, a dual-element (time-delay) fuse is generally capped at what percent of full-load current?

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