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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 37

Free Online Journeyman Electrician Exam Practice Test — 37This free 30-question practice test covers journeyman electrician exam topics based on the 2023 NEC, including nominal system voltages for load calculations (NEC 220.5), voltage drop, demand for cooking appliances (Table 220.55), parallel circuit calculations, ambient temperature correction factors for conductor ampacity, hazardous location classifications (NEC 515), inverter vs rectifier fundamentals, conductor derating thresholds, and ITC cable ratings.

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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.

Key rules: Use only the nominal voltages listed in NEC 220.5(A) for load calculations (120, 120/240, 208Y/120, 240, 480Y/277, 480, etc. — "208Y/240" is not valid). For four household cooking appliances over 1¾ kW, use 17 kW from NEC Table 220.55 Column C. THWN-2 (90°C) from NEC Table 310.16 = 195A for 2/0 AWG — use the 0.87 correction factor at 45°C. Conductor derating does NOT apply to conduit nipples of 24 inches or less. ITC cable is limited to 150V and 5A. Tank storage below grade inside buildings = Class I Zone 1.

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Journeyman Electrician Practice Test 37 — Question List

Question 1: Which of the following is not a nominal system voltage that should be used to compute branch circuit, feeder and service calculations?

120
120/240
208Y/240
208Y/120

NEC Reference: NEC 220.5(A)

Question 2: A 75 feet service is connected between 120/240 volts single phase feeder and a panel board. What is the voltage at panel board if the operating current of service is 60 amperes and resistance of service conductor is 0.2 ohms per 1000 feet?

239.1 volts
240 volts
238.5 volts
238 volts

Question 3: What is the maximum demand for four wall-mounted ovens, household electric ranges, and other household cooking appliances rated at over 1¾ kW each?

17 KW
15 KW
10 KW
25 KW

NEC Reference: NEC 220.55

Question 4: A 12 volts battery is connected group of four parallel resistors each with 4 ohms. How much current does the circuit draws from the battery?

12 Amperes
3 Amperes
8 Amperes
24 Amperes

Question 5: A lamp with wattage of 20 watt draws 0.5 ampere current. What is its operating voltage?

40 volts
10 volts
20 volts
80 volts

Question 6: What is the corrected ampacity of a 2/0 AWG THWN-2 conductor installed in a conduit in a dry location, if the ambient temperature at that location is 45°C?

170 Amperes
188 Amperes
139 Amperes
160 Amperes

NEC Reference: NEC Table 310.16

Question 7: Tank storage installations inside buildings below grade level are classified as _____.

Class I Zone 1
Class II Zone 1
Class I Division 1
Class I Zone 2

NEC Reference: NEC Table 515.3

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

Inverter
Rectifier

Question 9: Which of the following is the minimum length of raceway that the conductor ampacity adjustment factors can be applied?

24 inch
28 inch
18 inch
20 inch

NEC Reference: NEC 310.15(C)(1)

Question 10: Type ITC cables cannot be used in the circuits operating more than ………….. amperes at 150 volts?

NEC Reference: NEC 727.4

Question 11: Per NEC 220.5(A), which of the following is a valid nominal system voltage to be used for branch circuit, feeder, and service calculations?

208Y/240 volts
500 volts
480Y/277 volts
277 volts

NEC Reference: NEC 220.5(A)

Question 12: Per NEC 220.5(A), which of the following is a valid nominal system voltage to be used for branch circuit, feeder, and service calculations?

208Y/240 volts
500 volts
480Y/277 volts
277 volts

NEC Reference: NEC 220.5(A)

Question 13: Per NEC 230.24(B)(5), the minimum clearance of service drop conductors above the final grade of a residential yard — where the area is not subject to pedestrian or vehicle traffic — is _____ feet.

8 feet
10 feet
12 feet
15 feet

NEC Reference: NEC 230.24(B)

Question 14: Per NEC 230.24(B)(5), the minimum clearance of service drop conductors above the final grade of a residential yard — where the area is not subject to pedestrian or vehicle traffic — is _____ feet.

8 feet
10 feet
12 feet
15 feet

NEC Reference: NEC 230.24(B)

Question 15: Per NEC 250.52(A)(2), a metal underground water pipe may be used as a grounding electrode if the pipe has at least _____ of direct contact with the earth.

5 feet
8 feet
10 feet
20 feet

NEC Reference: NEC 250.52(A)(2)

Question 16: Per NEC 250.52(A)(2), a metal underground water pipe may be used as a grounding electrode if the pipe has at least _____ of direct contact with the earth.

5 feet
8 feet
10 feet
20 feet

NEC Reference: NEC 250.52(A)(2)

Question 17: A feeder supplies two motors: Motor A has a full-load current (FLC) of 20 amperes and Motor B has an FLC of 10 amperes. Per NEC 430.24, the minimum feeder conductor ampacity is _____ amperes.

30 amperes
35 amperes
37.5 amperes
40 amperes

NEC Reference: NEC 430.24

Question 18: A feeder supplies two motors: Motor A has a full-load current (FLC) of 20 amperes and Motor B has an FLC of 10 amperes. Per NEC 430.24, the minimum feeder conductor ampacity is _____ amperes.

30 amperes
35 amperes
37.5 amperes
40 amperes

NEC Reference: NEC 430.24

Question 19: Per NEC 220.61(B)(1), when calculating the feeder or service neutral load, the demand factor of 70% may be applied to the portion of the neutral load that exceeds _____ amperes.

100 amperes
150 amperes
200 amperes
250 amperes

NEC Reference: NEC 220.61(B)(1)

Question 20: Per NEC 220.61(B)(1), when calculating the feeder or service neutral load, the demand factor of 70% may be applied to the portion of the neutral load that exceeds _____ amperes.

100 amperes
150 amperes
200 amperes
250 amperes

NEC Reference: NEC 220.61(B)(1)

Question 21: Per NEC 110.27(A), live parts of electrical equipment operating at _____ volts or more shall be guarded against accidental contact by approved enclosures or by other approved means.

15 volts
30 volts
50 volts
120 volts

NEC Reference: NEC 110.27(A)

Question 22: Per NEC 110.27(A), live parts of electrical equipment operating at _____ volts or more shall be guarded against accidental contact by approved enclosures or by other approved means.

15 volts
30 volts
50 volts
120 volts

NEC Reference: NEC 110.27(A)

Question 23: Per NEC 501.15(A)(1), in a Class I, Division 1 hazardous location, a conduit seal shall be installed within _____ of each conduit entry into an explosion-proof enclosure.

6 inches
12 inches
18 inches
24 inches

NEC Reference: NEC 501.15(A)(1)

Question 24: Per NEC 501.15(A)(1), in a Class I, Division 1 hazardous location, a conduit seal shall be installed within _____ of each conduit entry into an explosion-proof enclosure.

6 inches
12 inches
18 inches
24 inches

NEC Reference: NEC 501.15(A)(1)

Question 25: What is the synchronous speed of a 4-pole, AC induction motor operating on a 60 Hz power supply?

3,600 RPM
1,800 RPM
1,200 RPM
900 RPM

Question 26: What is the synchronous speed of a 4-pole, AC induction motor operating on a 60 Hz power supply?

3,600 RPM
1,800 RPM
1,200 RPM
900 RPM

Question 27: A single-phase load draws 12 kilowatts of true power at a power factor of 0.80. What is the apparent power (kVA)?

9.6 kVA
12 kVA
15 kVA
16 kVA

Question 28: A single-phase load draws 12 kilowatts of true power at a power factor of 0.80. What is the apparent power (kVA)?

9.6 kVA
12 kVA
15 kVA
16 kVA

Question 29: The secondary of an isolation transformer is a separately derived system. Per NEC 250.30(A)(1), what is required to establish a grounding connection at the transformer secondary?

Main breaker at the secondary panelboard
System bonding jumper at the transformer
Nothing — isolated systems do not need to be grounded
A grounding resistor only

NEC Reference: NEC 250.30(A)(1)

Question 30: The secondary of an isolation transformer is a separately derived system. Per NEC 250.30(A)(1), what is required to establish a grounding connection at the transformer secondary?

NEC Reference: NEC 250.30(A)(1)

Question 31: Per NEC 215.12(B)(1), where feeders with different system voltages are installed in the same building, the ungrounded conductors of each system shall be identified to indicate the _____ .

Phase only
Phase and system voltage
Conductor ampacity and material
Nothing — identification is optional for feeders

NEC Reference: NEC 215.12(B)(1)

Question 32: Per NEC 240.15(B)(1), a circuit breaker used as a switch to control a fluorescent luminaire shall be marked with which designation?

"GFCI" — ground fault protection required
"SWD" — switching duty rated
"AFCI" — arc fault protection required
No special marking is required

NEC Reference: NEC 240.15(B)(1)

Question 33: Per NEC 250.20(B)(1), which of the following AC systems is required to be solidly grounded?

480V ungrounded delta, 3-phase, 3-wire
120/240V single-phase, 3-wire
2,400V ungrounded delta, 3-phase
DC 120V photovoltaic system

NEC Reference: NEC 250.20(B)(1)

Question 34: Per NEC 220.53, when calculating the load for four or more fixed appliances (not ranges, dryers, HVAC, or motors) served by the same feeder in a dwelling unit, the total nameplate load may be multiplied by _____ percent.

50%
60%
75%
100%

NEC Reference: NEC 220.53

Question 35: A No. 4 AWG THWN-2 conductor is installed in a conduit inside a boiler room where the ambient temperature is 50°C. The base ampacity from NEC Table 310.16 (90°C column) is 95 amperes. Using the correction factor of 0.82 from NEC Table 310.15(B) for 50°C at 90°C-rated insulation, what is the corrected ampacity?

95 amperes (no correction needed)
78 amperes
68 amperes
82 amperes

NEC Reference: NEC Table 310.16

Question 36: Per NEC 314.27(A)(2), the outlet box used to support a ceiling (paddle) fan shall be _____ .

Any standard metallic outlet box
Listed and identified for ceiling (paddle) fan support
A PVC box with metal backing plate
A single-gang device box mounted horizontally

NEC Reference: NEC 314.27(A)(2)

Question 37: Per NEC 422.16(B)(1), a cord-and-plug connected household electric range shall have a flexible cord that is not less than _ and not more than _ in length.

Not less than 2 ft and not more than 4 ft
Not less than 4 ft and not more than 6 ft
Not less than 6 ft and not more than 8 ft
Not less than 3 ft and not more than 36 inches

NEC Reference: NEC 422.16(B)(1)

Question 38: Per NEC 680.71, all 125-volt, single-phase receptacle outlets located within _____ of the inside walls of a hydromassage bathtub (whirlpool tub) shall have GFCI protection.

3 feet
5 feet
6 feet
10 feet

NEC Reference: NEC 680.71

Question 39: Per NEC 250.104(A)(1), the metal water piping system of a building shall be bonded to the service equipment enclosure. The bonding conductor shall be sized in accordance with _____ .

NEC Table 250.122 (based on the branch circuit OCPD)
NEC Table 250.66 (based on service entrance conductor size)
NEC Table 310.16 (conductor ampacity table)
Any copper conductor not smaller than No. 8 AWG

NEC Reference: NEC 250.104(A)(1)

Question 40: Per NEC 340.10, Type USE (Underground Service Entrance) cable is specifically listed for use as _____ .

Interior branch circuit wiring in homes
Underground service entrance and direct burial conductors
Interior wiring in walls only
Exposed wiring on the exterior of buildings

NEC Reference: NEC 340.10

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 37

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Journeyman Electrician Practice Test 37

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Journeyman Electrician Practice Test 37 — Question List

Question 1: Which of the following is not a nominal system voltage that should be used to compute branch circuit, feeder and service calculations?

Question 2: A 75 feet service is connected between 120/240 volts single phase feeder and a panel board. What is the voltage at panel board if the operating current of service is 60 amperes and resistance of service conductor is 0.2 ohms per 1000 feet?

Question 3: What is the maximum demand for four wall-mounted ovens, household electric ranges, and other household cooking appliances rated at over 1¾ kW each?

Question 4: A 12 volts battery is connected group of four parallel resistors each with 4 ohms. How much current does the circuit draws from the battery?

Question 5: A lamp with wattage of 20 watt draws 0.5 ampere current. What is its operating voltage?

Question 6: What is the corrected ampacity of a 2/0 AWG THWN-2 conductor installed in a conduit in a dry location, if the ambient temperature at that location is 45°C?

Question 7: Tank storage installations inside buildings below grade level are classified as _____.

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

Question 9: Which of the following is the minimum length of raceway that the conductor ampacity adjustment factors can be applied?

Question 10: Type ITC cables cannot be used in the circuits operating more than ………….. amperes at 150 volts?

Question 11: Per NEC 220.5(A), which of the following is a valid nominal system voltage to be used for branch circuit, feeder, and service calculations?

Question 12: Per NEC 220.5(A), which of the following is a valid nominal system voltage to be used for branch circuit, feeder, and service calculations?

Question 13: Per NEC 230.24(B)(5), the minimum clearance of service drop conductors above the final grade of a residential yard — where the area is not subject to pedestrian or vehicle traffic — is _____ feet.

Question 14: Per NEC 230.24(B)(5), the minimum clearance of service drop conductors above the final grade of a residential yard — where the area is not subject to pedestrian or vehicle traffic — is _____ feet.

Question 15: Per NEC 250.52(A)(2), a metal underground water pipe may be used as a grounding electrode if the pipe has at least _____ of direct contact with the earth.

Question 16: Per NEC 250.52(A)(2), a metal underground water pipe may be used as a grounding electrode if the pipe has at least _____ of direct contact with the earth.

Question 17: A feeder supplies two motors: Motor A has a full-load current (FLC) of 20 amperes and Motor B has an FLC of 10 amperes. Per NEC 430.24, the minimum feeder conductor ampacity is _____ amperes.

Question 18: A feeder supplies two motors: Motor A has a full-load current (FLC) of 20 amperes and Motor B has an FLC of 10 amperes. Per NEC 430.24, the minimum feeder conductor ampacity is _____ amperes.

Question 19: Per NEC 220.61(B)(1), when calculating the feeder or service neutral load, the demand factor of 70% may be applied to the portion of the neutral load that exceeds _____ amperes.

Question 20: Per NEC 220.61(B)(1), when calculating the feeder or service neutral load, the demand factor of 70% may be applied to the portion of the neutral load that exceeds _____ amperes.

Question 21: Per NEC 110.27(A), live parts of electrical equipment operating at _____ volts or more shall be guarded against accidental contact by approved enclosures or by other approved means.

Question 22: Per NEC 110.27(A), live parts of electrical equipment operating at _____ volts or more shall be guarded against accidental contact by approved enclosures or by other approved means.

Question 23: Per NEC 501.15(A)(1), in a Class I, Division 1 hazardous location, a conduit seal shall be installed within _____ of each conduit entry into an explosion-proof enclosure.

Question 24: Per NEC 501.15(A)(1), in a Class I, Division 1 hazardous location, a conduit seal shall be installed within _____ of each conduit entry into an explosion-proof enclosure.

Question 25: What is the synchronous speed of a 4-pole, AC induction motor operating on a 60 Hz power supply?

Question 26: What is the synchronous speed of a 4-pole, AC induction motor operating on a 60 Hz power supply?

Question 27: A single-phase load draws 12 kilowatts of true power at a power factor of 0.80. What is the apparent power (kVA)?

Question 28: A single-phase load draws 12 kilowatts of true power at a power factor of 0.80. What is the apparent power (kVA)?

Question 29: The secondary of an isolation transformer is a separately derived system. Per NEC 250.30(A)(1), what is required to establish a grounding connection at the transformer secondary?

Question 30: The secondary of an isolation transformer is a separately derived system. Per NEC 250.30(A)(1), what is required to establish a grounding connection at the transformer secondary?

Question 31: Per NEC 215.12(B)(1), where feeders with different system voltages are installed in the same building, the ungrounded conductors of each system shall be identified to indicate the _____ .

Question 32: Per NEC 240.15(B)(1), a circuit breaker used as a switch to control a fluorescent luminaire shall be marked with which designation?

Question 33: Per NEC 250.20(B)(1), which of the following AC systems is required to be solidly grounded?

Question 34: Per NEC 220.53, when calculating the load for four or more fixed appliances (not ranges, dryers, HVAC, or motors) served by the same feeder in a dwelling unit, the total nameplate load may be multiplied by _____ percent.

Question 36: Per NEC 314.27(A)(2), the outlet box used to support a ceiling (paddle) fan shall be _____ .

Question 37: Per NEC 422.16(B)(1), a cord-and-plug connected household electric range shall have a flexible cord that is not less than _____ and not more than _____ in length.

Question 38: Per NEC 680.71, all 125-volt, single-phase receptacle outlets located within _____ of the inside walls of a hydromassage bathtub (whirlpool tub) shall have GFCI protection.

Question 39: Per NEC 250.104(A)(1), the metal water piping system of a building shall be bonded to the service equipment enclosure. The bonding conductor shall be sized in accordance with _____ .

Question 40: Per NEC 340.10, Type USE (Underground Service Entrance) cable is specifically listed for use as _____ .

Key NEC References for This Test

Related Practice Tests

Question 37: Per NEC 422.16(B)(1), a cord-and-plug connected household electric range shall have a flexible cord that is not less than _ and not more than _ in length.