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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 39

Free Online Journeyman Electrician Exam Practice Test — 39This free 30-question practice test covers journeyman exam topics based on the 2023 NEC, including conductor ampacity adjustment for 7 bundled conductors (NEC Table 310.16), demand factors for household dryers (NEC 220.54), unit loads for restaurants (NEC Table 220.12), combined voltage drop recommendations (NEC 215.2), low-voltage lighting systems (NEC 411), inductive VA sizing, mobile home power supply cord length (NEC 550.10), rectifiers vs inverters, standard fuse ratings (NEC 240.6), and Ohm's Law power calculations.

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Yes — completely free with no account required. All questions include detailed explanations and NEC references.

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.

Key rules for this test: 3/0 THWN = 200A base (NEC Table 310.16); 7 conductors in raceway = 70% adjustment (NEC Table 310.15(C)(1)). Household dryer demand: 6 dryers = 75% (NEC Table 220.54). Restaurants = 2 VA/sq ft (NEC Table 220.12). Combined feeder + branch circuit voltage drop recommended not to exceed 5% (NEC 215.2(A)(1) Informational Note). Mobile home power supply cord minimum 20 ft long (NEC 550.10(D)). Standard fuse ratings per NEC 240.6(A) — 55A is NOT a standard size.

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45 min

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Journeyman Electrician Practice Test 39 — Question List

Question 1: What is the adjustment ampacity of a 3/0 THWN conductors in a wet location, if the raceway contains seven conductors in it?

122.5 amperes
125.5 amperes
140 amperes
133 amperes

NEC Reference: NEC Table 310.16

Question 2: At which of the following percentage the demand factor for six house hold electric cloth dryers is calculated?

NEC Reference: NEC 220.54

Question 3: What is the unit load per square foot in volt ampere for a restaurant?

1 VA
2 VA
3 VA
1 1/2 VA

NEC Reference: NEC 220.12

Question 4: What is permissible voltage drop in percentage for combination of both feeders and branch circuit conductors?

NEC Reference: NEC 215.2(A)(1)

Question 5: Per NEC 411.5(A), each power supply unit that supplies a lighting system operating at 30 volts or less shall have an output rating not exceeding _____ amperes.

30 Amperes
20 Amperes
25 Amperes
35 Amperes

NEC Reference: NEC 411.5(A)

Question 6: For inductive rating the branch circuits must be sized according to wattage rating not VA rating.

True
False

Question 7: The overall length of the power supply cord for a mobile home, measured from the point of entry into the mobile home to the plug-type connector, shall not be less than __________ feet.

20 feet
36 1/2 feet
25 feet
28 1/2 feet

NEC Reference: NEC 550.10(D)

Question 8: A device that converts AC input into pulsating DC output is called a __________.

Rectifier
Inverter
clamper
clipper

Question 9: Which of the following is not a standard fuse rating of a electrical fuse as per NEC?

NEC Reference: NEC 240.6(A)

Question 10: A lamp operating at 120 volts has a resistance of 480 ohms. What is the wattage of the lamp?

30 watts
25 watts
20 watts
0.25 watts

Question 11: Per NEC 210.19(A)(1), when a branch circuit supplies a combination of continuous and noncontinuous loads, the minimum branch circuit conductor ampacity shall be not less than _____ percent of the continuous load plus 100 percent of the noncontinuous load.

100%
115%
125%
150%

NEC Reference: NEC 210.19(A)(1)

Question 12: Per NEC 230.79(C), the service disconnecting means installed for a one-family dwelling shall have a rating of not less than _____ amperes, 3-wire.

60 amperes, 2-wire
60 amperes, 3-wire
100 amperes, 3-wire
200 amperes, 3-wire

NEC Reference: NEC 230.79(C)

Question 13: Per NEC 334.30, Type NM (nonmetallic-sheathed) cable shall be secured at intervals not exceeding _____ feet and within 12 inches of each outlet box, junction box, or other cable termination.

3 feet
4 feet
4.5 feet
6 feet

NEC Reference: NEC 334.30

Question 14: Per NEC 300.20(A), when AC conductors are run in a metal raceway, all conductors of the same circuit — including all phase conductors, the neutral, and the equipment grounding conductor — must be _____ to prevent inductive heating of the metal raceway.

Separated into individual conduits for each conductor
Grouped together in the same raceway
Installed at least 12 inches apart in the raceway
Run in separate raceways with bonding jumpers between them

NEC Reference: NEC 300.20(A)

Question 15: Per NEC Table 300.5, the minimum cover (depth of burial) for direct-buried cables and conductors (not in conduit) in a general location not subject to vehicle traffic is _____ inches.

6 inches
12 inches
18 inches
24 inches

NEC Reference: NEC Table 300.5

Question 16: Per NEC 404.2(A), a general-use snap switch shall not be used to disconnect the _____ conductor of a circuit.

Ungrounded (hot) conductor
Grounded (neutral) conductor
Equipment grounding conductor
Any conductor — switches can be placed anywhere

NEC Reference: NEC 404.2(A)

Question 17: Per NEC 250.68(A), the connection of the grounding electrode conductor (GEC) to the grounding electrode shall be _____ .

Buried at least 12 inches below grade
Accessible
Concealed inside the wall near the panel
Located at the top of the main service panel only

NEC Reference: NEC 250.68(A)

Question 18: Per NEC 352.44, expansion fittings shall be provided for rigid PVC conduit where the total expected change in length from thermal expansion is _____ or greater.

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

NEC Reference: NEC 352.44

Question 19: Per NEC 430.102(A), the disconnecting means for a motor shall be located within sight from the motor controller. If the disconnect is NOT within sight from the controller, the disconnecting means shall be _____ .

Located at the motor nameplate
Capable of being locked in the open (off) position
Installed on the motor frame itself
Connected to an alarm system

NEC Reference: NEC 430.102(A)

Question 20: A recessed luminaire (light fixture) that is NOT listed as Type IC (insulation-contact rated) shall maintain a minimum clearance of _____ from thermal insulation in the ceiling.

1 inch
2 inches
3 inches
6 inches

NEC Reference: NEC 410.116(B)

Question 21: Per NEC 344.30(B)(2), rigid metal conduit (RMC) shall be secured at intervals not exceeding _____ feet and within 3 feet of each outlet box, junction box, conduit body, or other conduit termination.

5 feet
8 feet
10 feet
12 feet

NEC Reference: NEC 344.30(B)(2)

Question 22: Per NEC 210.52(A)(1), in dwelling units, receptacle outlets shall be installed so that no point measured horizontally along the floor line of any wall space is more than _____ from a receptacle outlet.

4 feet
6 feet
8 feet
12 feet

NEC Reference: NEC 210.52(A)(1)

Question 23: Per NEC 210.21(B)(1), a single receptacle installed on an individual branch circuit shall have an ampere rating not less than the _____ of that branch circuit.

Half the ampere rating of the branch circuit
Ampere rating of the branch circuit
Always 15 amperes regardless of circuit size
Always 20 amperes regardless of circuit size

NEC Reference: NEC 210.21(B)(1)

Question 24: Per NEC 250.24(A)(1), the grounded service conductor (neutral) of an AC system shall be connected to the grounding electrode conductor (GEC) at the _____ .

First sub-panel after the main service
Service disconnecting means (main service panel)
Every distribution panel in the building
The grounding electrode only — not at any panel

NEC Reference: NEC 250.24(A)(1)

Question 25: Per NEC Table 110.26(A)(1), the minimum depth of working space required in front of electrical equipment operating at 0 to 150 volts to ground (such as a 120/240V residential panel) is _____ feet.

2 feet
3 feet
4 feet
5 feet

NEC Reference: NEC Table 110.26(A)(1)

Question 26: Per NEC 220.50, motor loads included in feeder and service load calculations shall be determined in accordance with _____ .

The motor nameplate horsepower converted to watts
NEC Article 430 (Parts II, IV, and V)
NEC Table 220.12 unit load values
The motor nameplate current rating directly

NEC Reference: NEC 220.50

Question 27: Kirchhoff's Current Law (KCL) states that at any junction (node) in a circuit, the sum of all currents entering the node must equal the sum of all currents _____ the node.

Entering
Leaving
Bypassing
Stored at

Question 28: Per NEC 110.26(F)(1), in indoor locations, the dedicated space above a switchboard or panelboard shall extend from the top of the equipment to a height of _____ feet above the equipment (or to the structural ceiling, whichever is lower).

3 feet
4 feet
6 feet
10 feet

NEC Reference: NEC 110.26(F)(1)

Question 29: Per NEC 250.28(D)(1), when the main bonding jumper in a service panel is a screw, the screw shall be identified with a _____ finish that is visible with the screw installed.

Red
Green
White
Black

NEC Reference: NEC 250.28(D)(1)

Question 30: Per NEC 240.24(E), in dwelling units, overcurrent protective devices (circuit breakers, fuses) shall NOT be located in _____ .

Garages
Bathrooms
Utility closets
Basements

NEC Reference: NEC 240.24(E)

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 39

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Key NEC References for This Test

Journeyman Electrician Practice Test 39

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Journeyman Electrician Practice Test 39 — Question List

Question 1: What is the adjustment ampacity of a 3/0 THWN conductors in a wet location, if the raceway contains seven conductors in it?

Question 2: At which of the following percentage the demand factor for six house hold electric cloth dryers is calculated?

Question 3: What is the unit load per square foot in volt ampere for a restaurant?

Question 4: What is permissible voltage drop in percentage for combination of both feeders and branch circuit conductors?

Question 5: Per NEC 411.5(A), each power supply unit that supplies a lighting system operating at 30 volts or less shall have an output rating not exceeding _____ amperes.

Question 6: For inductive rating the branch circuits must be sized according to wattage rating not VA rating.

Question 7: The overall length of the power supply cord for a mobile home, measured from the point of entry into the mobile home to the plug-type connector, shall not be less than __________ feet.

Question 8: A device that converts AC input into pulsating DC output is called a __________.

Question 9: Which of the following is not a standard fuse rating of a electrical fuse as per NEC?

Question 10: A lamp operating at 120 volts has a resistance of 480 ohms. What is the wattage of the lamp?

Question 11: Per NEC 210.19(A)(1), when a branch circuit supplies a combination of continuous and noncontinuous loads, the minimum branch circuit conductor ampacity shall be not less than _____ percent of the continuous load plus 100 percent of the noncontinuous load.

Question 12: Per NEC 230.79(C), the service disconnecting means installed for a one-family dwelling shall have a rating of not less than _____ amperes, 3-wire.

Question 13: Per NEC 334.30, Type NM (nonmetallic-sheathed) cable shall be secured at intervals not exceeding _____ feet and within 12 inches of each outlet box, junction box, or other cable termination.

Question 14: Per NEC 300.20(A), when AC conductors are run in a metal raceway, all conductors of the same circuit — including all phase conductors, the neutral, and the equipment grounding conductor — must be _____ to prevent inductive heating of the metal raceway.

Question 15: Per NEC Table 300.5, the minimum cover (depth of burial) for direct-buried cables and conductors (not in conduit) in a general location not subject to vehicle traffic is _____ inches.

Question 16: Per NEC 404.2(A), a general-use snap switch shall not be used to disconnect the _____ conductor of a circuit.

Question 17: Per NEC 250.68(A), the connection of the grounding electrode conductor (GEC) to the grounding electrode shall be _____ .

Question 18: Per NEC 352.44, expansion fittings shall be provided for rigid PVC conduit where the total expected change in length from thermal expansion is _____ or greater.

Question 19: Per NEC 430.102(A), the disconnecting means for a motor shall be located within sight from the motor controller. If the disconnect is NOT within sight from the controller, the disconnecting means shall be _____ .

Question 20: A recessed luminaire (light fixture) that is NOT listed as Type IC (insulation-contact rated) shall maintain a minimum clearance of _____ from thermal insulation in the ceiling.

Question 21: Per NEC 344.30(B)(2), rigid metal conduit (RMC) shall be secured at intervals not exceeding _____ feet and within 3 feet of each outlet box, junction box, conduit body, or other conduit termination.

Question 22: Per NEC 210.52(A)(1), in dwelling units, receptacle outlets shall be installed so that no point measured horizontally along the floor line of any wall space is more than _____ from a receptacle outlet.

Question 23: Per NEC 210.21(B)(1), a single receptacle installed on an individual branch circuit shall have an ampere rating not less than the _____ of that branch circuit.

Question 24: Per NEC 250.24(A)(1), the grounded service conductor (neutral) of an AC system shall be connected to the grounding electrode conductor (GEC) at the _____ .

Question 25: Per NEC Table 110.26(A)(1), the minimum depth of working space required in front of electrical equipment operating at 0 to 150 volts to ground (such as a 120/240V residential panel) is _____ feet.

Question 26: Per NEC 220.50, motor loads included in feeder and service load calculations shall be determined in accordance with _____ .

Question 27: Kirchhoff's Current Law (KCL) states that at any junction (node) in a circuit, the sum of all currents entering the node must equal the sum of all currents _____ the node.

Question 28: Per NEC 110.26(F)(1), in indoor locations, the dedicated space above a switchboard or panelboard shall extend from the top of the equipment to a height of _____ feet above the equipment (or to the structural ceiling, whichever is lower).

Question 29: Per NEC 250.28(D)(1), when the main bonding jumper in a service panel is a screw, the screw shall be identified with a _____ finish that is visible with the screw installed.

Question 30: Per NEC 240.24(E), in dwelling units, overcurrent protective devices (circuit breakers, fuses) shall NOT be located in _____ .

Key NEC References for This Test

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