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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 25

Free practice test 25 for the journeyman electrician exam. Covers EMT conduit support, service conductor sizing, flexible metal conduit, NEC definitions, impedance heating transformers, motor overload, panelboard protection, air conditioner branch circuits, and induction motor theory.

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Most state Journeyman exams have 80–100 questions covering NEC code, wiring methods, branch circuits, motor controls, and load calculations.

Most states require a 70–75% passing score. This practice test uses the same 70% pass threshold so you know where you stand.

Questions are written to the 2023 NEC. Check your state licensing board to confirm which edition your state has adopted.

This test covers conduit rules, motor protection, and AC equipment. EMT must be supported within 3 feet of any outlet box and at intervals not exceeding 10 feet (NEC 358.30(A)). Motor overload protection for motors with a service factor of 1.15 or more is 115% of the nameplate full load current (NEC 430.32(A)(1)). For cord-and-plug connected window air conditioners on a single-load 20A circuit, the maximum full load current is 80% of the circuit rating = 16A (NEC 440.62(B)). The secondary voltage of a transformer connected to impedance heating elements without GFCI protection cannot exceed 30 volts (NEC 424.32).

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Journeyman Electrician Practice Test 25 — Question List

Question 1: The EMT conduit run in between two terminal points shall be securely fastened within ............. of a outlet box.

3 ft
10 ft
8 ft
5 ft

NEC Reference: NEC 358.30(A)

Question 2: The calculated demand load of a 120/240V dwelling unit is 250 amperes. What is the minimum size THW copper conductor that can be used as a service conductor?

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

NEC Reference: NEC 310.15(B)

Question 3: If the flexible metal conduit is used for tap connections to luminaries , what the minimum size that shall be used?

1/2 inch
1 inch
1 1/2 inches
2 inches

NEC Reference: NEC 348.20

Question 4: As per NEC , The purpose of Electrical device is which of the following?

utilize energy
Transfer Energy from one place to another only
Transfer and control the energy
Controls the energy only

Question 5: The secondary voltage of a transformer connected to the impedance heating elements shall not be over .................. volts if it is not protected by GFCI.

NEC Reference: NEC 424.32

Question 6: A single-phase 5 HP, 230-volt motor has a nameplate full load current rating of 40 amperes. What is its overload protection device rating in amperes?

46 amperes
40 amperes
50 amperes
60 amperes

NEC Reference: NEC 430.32

Question 7: Which of the following is a over current protection rating of a 30 amperes snap switch equipped on panel board?

200 amperes
100 amperes
50 amperes
150 amperes

NEC Reference: NEC 408.36

Question 8: A 120-volt branch circuit supplies only a cord-and-plug connected window air conditioner. The branch circuit rating is 20 amperes. What is the maximum full load current rating of the air conditioner?

16 amperes
10 amperes
20 amperes
15 amperes

NEC Reference: NEC 440.62

Question 9: In an electric induction motor, the developed torque is proportional to: ...

Supply Voltage 2
1 / Supply Voltage 2
Supply Voltage
1 / Supply Voltage

Question 10: In an Electric circuit the power factor is the ratio of apparent power to effective power(real power).

True
False

Question 11: A motor has no service factor marking. Per NEC 430.32(A)(1), what is the maximum overload protection rating as a percentage of the motor's full load current?

125%
115%
100%
140%

NEC Reference: NEC 430.32(A)(1)

Question 12: A single motor has a nameplate full load current of 24 amperes. What minimum ampacity must the motor branch circuit conductors have?

24 amperes
30 amperes
28 amperes
20 amperes

NEC Reference: NEC 430.22

Question 13: A motor has a full load current of 20 amperes. Using a dual-element (time-delay) fuse for branch circuit short-circuit protection, the maximum fuse rating per NEC 430.52 and Table 430.52 is .............

20 amperes
35 amperes
40 amperes
50 amperes

NEC Reference: NEC 430.52

Question 14: A 20-ampere, 120-volt branch circuit is the ONLY load on the circuit and supplies a cord-and-plug window air conditioner. What is the maximum full load current the air conditioner may draw?

20 amperes
16 amperes
15 amperes
18 amperes

NEC Reference: NEC 440.62(B)

Question 15: If GFCI protection IS provided on a transformer secondary supplying impedance heating elements, what is the maximum secondary voltage allowed?

30 volts
80 volts
120 volts
50 volts

NEC Reference: NEC 424.32

Question 16: Per NEC Article 100, an electrical "device" is defined as a unit of equipment intended to .............

Utilize electrical energy to do work
Carry or control electric energy
Generate electrical energy
Convert electrical energy to light only

NEC Reference: NEC 100

Question 17: What is the minimum trade size of Flexible Metal Conduit (FMC) permitted for tap connections to luminaires (fixtures)?

1/4 inch
3/8 inch
1/2 inch
3/4 inch

NEC Reference: NEC 348.20(B)

Question 18: In an induction motor, if the supply voltage drops by 10%, what happens to the starting torque?

Starting torque increases by 10%
Starting torque decreases to about 81% of rated value (drops about 19%)
Starting torque drops by exactly 10%
Starting torque is not affected by voltage

Question 19: Power factor (PF) is defined as the ratio of .............

Apparent power to true power
True power to apparent power
Reactive power to apparent power
True power to reactive power

Question 20: Per NEC 408.36, each panelboard must be individually protected by an overcurrent device on the supply side rated NOT more than .............

125% of the panelboard rating
The ampere rating of the panelboard
200 amperes regardless of panelboard rating
The total connected load

NEC Reference: NEC 408.36

Question 21: The disconnecting means for a hermetic refrigerant motor-compressor must be located .............

Anywhere in the building
Within sight of and readily accessible from the equipment
At the main electrical panel only
Adjacent to the meter socket

NEC Reference: NEC 440.14

Question 22: What minimum ampacity must branch circuit conductors have for a single hermetic refrigerant motor-compressor?

100% of the rated load current
125% of the rated load current or branch circuit selection current (whichever is larger)
150% of the rated load current
80% of the rated load current

NEC Reference: NEC 440.32

Question 23: What is the maximum fill percentage for more than two conductors in a conduit or raceway?

Question 24: EMT conduit must be fastened within ............. of each outlet box or junction box.

6 feet
3 feet
5 feet
10 feet

NEC Reference: NEC 358.30(A)

Question 25: Flexible Metal Conduit (FMC) must be supported at intervals not exceeding .............

3 feet
4.5 feet
6 feet
10 feet

NEC Reference: NEC 348.30(A)

Question 26: An equipment grounding conductor (EGC) that is individually covered or insulated must be identified with .............

White or gray color
Green or green with yellow stripes
Red color
Orange color

NEC Reference: NEC 250.119

Question 27: What color must an insulated grounded conductor (neutral) be identified with for sizes No. 6 AWG and smaller?

Green or bare
White or gray
Red
Any color not already used for hot conductors

NEC Reference: NEC 200.6(A)

Question 28: Ungrounded (hot) conductors in a wiring system must NOT be identified with which colors?

Black and red
White, gray, or green
Blue and orange
Brown and yellow

NEC Reference: NEC 110.15

Question 29: A supply-side bonding jumper is used where service conductors pass through separate enclosures. How is its size determined?

Same size as the service conductors always
Per NEC Table 250.102(C)(1) based on service conductor size
Minimum No. 6 AWG copper always
Based on the load current calculation

NEC Reference: NEC 250.102(C)

Question 30: Induction motor starting (locked rotor) current is typically how many times the full load running current?

1 to 2 times FLC
6 to 8 times FLC
2 to 3 times FLC
10 to 15 times FLC

Key NEC References for This Test

Article	What It Covers
Art. 100	Definitions — know: feeder, branch circuit, OCPD, dwelling unit
Art. 210	Branch Circuits — GFCI/AFCI locations, circuit ratings, outlet spacing (most tested)
Art. 220	Load Calculations — dwelling unit standard method
Art. 250	Grounding & Bonding — GEC sizing, electrode system, EGC
Art. 310	Conductors — ampacity (Table 310.12), insulation, derate rules
Art. 430	Motors — conductor 125% FLA, OCPD 250% FLA, overloads, disconnects

Study Tip: Tab Articles 210, 250, and 430 in your NEC before the exam. Know the Table 310.12 ampacity values for 14, 12, 10, 8, 6, and 4 AWG copper.

Journeyman Electrician Practice Test 25

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Key NEC References for This Test

Journeyman Electrician Practice Test 25

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Journeyman Electrician Practice Test 25 — Question List

Question 1: The EMT conduit run in between two terminal points shall be securely fastened within ............. of a outlet box.

Question 2: The calculated demand load of a 120/240V dwelling unit is 250 amperes. What is the minimum size THW copper conductor that can be used as a service conductor?

Question 3: <span style="font-size: 14pt;">If the flexible metal conduit is used for tap connections to luminaries , what the minimum size that shall be used?</span>

Question 4: <span style="font-size: 14pt;">As per NEC , The purpose of Electrical device is which of the following?</span>

Question 5: <span style="font-size: 14pt;">The secondary voltage of a transformer connected to the impedance heating elements shall not be over .................. volts if it is not protected by GFCI.</span>

Question 6: A single-phase 5 HP, 230-volt motor has a nameplate full load current rating of 40 amperes. What is its overload protection device rating in amperes?

Question 7: <span style="font-size: 14pt;">Which of the following is a over current protection rating of a 30 amperes snap switch equipped on panel board?</span>

Question 8: A 120-volt branch circuit supplies only a cord-and-plug connected window air conditioner. The branch circuit rating is 20 amperes. What is the maximum full load current rating of the air conditioner?

Question 9: In an electric induction motor, the developed torque is proportional to: ...

Question 10: In an Electric circuit the power factor is the ratio of apparent power to effective power(real power).

Question 11: A motor has no service factor marking. Per NEC 430.32(A)(1), what is the maximum overload protection rating as a percentage of the motor's full load current?

Question 12: A single motor has a nameplate full load current of 24 amperes. What minimum ampacity must the motor branch circuit conductors have?

Question 13: A motor has a full load current of 20 amperes. Using a dual-element (time-delay) fuse for branch circuit short-circuit protection, the maximum fuse rating per NEC 430.52 and Table 430.52 is .............

Question 14: A 20-ampere, 120-volt branch circuit is the ONLY load on the circuit and supplies a cord-and-plug window air conditioner. What is the maximum full load current the air conditioner may draw?

Question 15: If GFCI protection IS provided on a transformer secondary supplying impedance heating elements, what is the maximum secondary voltage allowed?

Question 16: Per NEC Article 100, an electrical "device" is defined as a unit of equipment intended to .............

Question 17: What is the minimum trade size of Flexible Metal Conduit (FMC) permitted for tap connections to luminaires (fixtures)?

Question 18: In an induction motor, if the supply voltage drops by 10%, what happens to the starting torque?

Question 19: Power factor (PF) is defined as the ratio of .............

Question 20: Per NEC 408.36, each panelboard must be individually protected by an overcurrent device on the supply side rated NOT more than .............

Question 21: The disconnecting means for a hermetic refrigerant motor-compressor must be located .............

Question 22: What minimum ampacity must branch circuit conductors have for a single hermetic refrigerant motor-compressor?

Question 23: What is the maximum fill percentage for more than two conductors in a conduit or raceway?

Question 24: EMT conduit must be fastened within ............. of each outlet box or junction box.

Question 25: Flexible Metal Conduit (FMC) must be supported at intervals not exceeding .............

Question 26: An equipment grounding conductor (EGC) that is individually covered or insulated must be identified with .............

Question 27: What color must an insulated grounded conductor (neutral) be identified with for sizes No. 6 AWG and smaller?

Question 28: Ungrounded (hot) conductors in a wiring system must NOT be identified with which colors?

Question 29: A supply-side bonding jumper is used where service conductors pass through separate enclosures. How is its size determined?

Question 30: Induction motor starting (locked rotor) current is typically how many times the full load running current?

Key NEC References for This Test

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