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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 38

Free Online Journeyman Electrician Exam Practice Test — 38This free 30-question practice test covers journeyman electrician exam topics based on the 2023 NEC, including mobile home power supply (NEC 550), pool pump GFCI (NEC 680), parallel conductor minimum size (NEC 310), plug fuse voltage rating (NEC 240), service drop clearances (NEC 230), ammeter connections, transformer secondary current calculations, central heating individual branch circuits (NEC 422), small appliance circuits (NEC 210), and shared circuit appliance load limits.

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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: Mobile home power supply = 50A (NEC 550.10(A)). Pool pump motors must have GFCI protection (NEC 680.21(C)). Parallel conductors minimum 1/0 AWG (NEC 310.10(H)(1)). Plug fuses max 125V (NEC 240.50(A)). Service drop above general grade = 10 ft minimum (NEC 230.24(B)). Central heating must be on an individual branch circuit — not a multi-wire circuit (NEC 422.12). Two 20A small appliance circuits required in kitchens (NEC 210.11(C)(1)). When a branch circuit has both lighting and a fastened-in-place appliance, the appliance load shall not exceed 50% of circuit rating (NEC 210.23(A)(2)).

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Journeyman Electrician Practice Test 38 — Question List

Question 1: What is the maximum load a mobile home may be supplied with through a power-supply cord (above which a permanent feeder is required)?

100 A
50 A
40 A
30 A

NEC Reference: NEC 550.10(A)

Question 2: An electric pool water heater draws 60 A. What does 680.10 require for its heating elements?

Subdivided into 48 A loads, 60 A protection
Only GFCI protection
A single 80 A breaker
Nothing special is required

NEC Reference: NEC 680.10

Question 3: Conductors smaller than 1/0 AWG are generally not permitted in parallel. For which use does the exception permit smaller parallel conductors?

Service-entrance conductors
Dwelling feeders over 100 A
General-purpose branch circuits
Control power to relays and instruments

NEC Reference: NEC 310.10(G)(1) Exception

Question 4: Where may 300-volt-type cartridge fuses be used?

Up to 300 V, incl. 277 V from a wye
On any 480-volt circuit
Only on DC circuits
Only in circuits up to 125 V

NEC Reference: NEC 240.60(A)(1)

Question 5: Overhead service conductors operating at more than 300 V to ground pass over a residential driveway. What is the minimum clearance?

10 ft
12 ft
15 ft
18 ft

NEC Reference: NEC 230.24(B)(3)

Question 6: Why does a voltmeter have a very high internal resistance?

So it barely loads the circuit
So it can carry the full load current
To protect it from short circuits
So it can be connected in series

Question 7: The primary of transformer draws 5 amperes at 480 volts. The voltmeter reading at secondary is 240 volts. What is its ammeter reading at secondary?

Question 8: When may a line-voltage thermostat serve as both the controller and the disconnecting means for electric space heating?

Whenever the thermostat is listed
Only on 120-volt heaters
Never; a separate switch is needed
With a marked OFF that opens all hot legs

NEC Reference: NEC 424.20(A)

Question 9: In a dwelling dining room, may a switch-controlled receptacle (used instead of a lighting outlet) be supplied from a general-purpose 15-ampere circuit?

No; all must be on small-appliance circuits
Yes, as an extra switched receptacle
Only if it is GFCI protected
Only in the kitchen itself

NEC Reference: NEC 210.52(B)(1) Exception No. 1

Question 10: A lighting unit is connected on a 20 ampere branch circuit on which a fastened-in place appliance is located. What is the maximum percentage branch circuit rating is permitted on the appliance?

80 %
70 %
50 %
60 %

NEC Reference: NEC 210.23(A)(2)

Question 11: Per NEC 406.12, all nonlocking-type, 125-volt, 15- and 20-ampere receptacles installed in the locations specified in NEC 210.52 (standard dwelling unit receptacle locations) shall be _____ .

Listed tamper-resistant receptacles
GFCI-type receptacles only
20-ampere rated duplex receptacles only
Standard receptacles — no special requirement

NEC Reference: NEC 406.12

Question 12: A luminaire is installed in or under metal roof decking. What clearance must it maintain from the lowest surface of the decking?

3 in.
1½ in.
½ in.
¼ in.

NEC Reference: NEC 410.10(F)

Question 13: May a motor controller also serve as the motor overload device?

No, never
Only if it is a manual starter
Yes, if it meets Table 430.37
Only for DC motors

NEC Reference: NEC 430.39

Question 14: Rooftop air-conditioning equipment is supplied through EMT with non-threaded (set-screw or compression) fittings outdoors. What does 440.9 require?

A ground rod on the roof
A wire-type EGC outdoors
Threaded rigid conduit only
Nothing; the EMT is the EGC

NEC Reference: NEC 440.9

Question 15: How must a constant-voltage generator be protected from overload?

Only by a GFCI device
Only by the serving utility
It needs no protection
Inherent design, breakers or fuses

NEC Reference: NEC 445.12(A)

Question 16: A 480-volt transformer has a rated primary current of 20 A. Secondary protection is provided at not more than 125%. What is the maximum primary overcurrent device rating?

25 A
30 A
40 A
50 A

NEC Reference: NEC 450.3(B) and Table 450.3(B)

Question 17: How must flexible cords be connected to devices and fittings?

So no tension reaches the terminals
With tape wrapped at the entry
With a knot tied inside the device
With tension carried by the terminal screws

NEC Reference: NEC 400.14

Question 18: May liquidtight flexible metal conduit (LFMC) be direct buried?

Only under buildings
Only if encased in concrete
Yes, if listed and marked for it
No, never

NEC Reference: NEC 350.10

Question 19: May EMT be threaded in the field?

No, it shall not be threaded
Yes, the same as rigid conduit
Only when installed outdoors
Only the ½ in. trade size

NEC Reference: NEC 358.28(B)

Question 20: A 1,600 A, 480Y/277-volt service supplies a continuous industrial process where a sudden shutdown would create additional hazards. Is ground-fault protection of equipment required on the service disconnect?

Yes, GFPE is always required
Only if the process is outdoors
Only for fire pump loads
No; the exception applies to it

NEC Reference: NEC 230.95 Exception

Question 21: In a load calculation, what minimum load is used for each outlet supplying a heavy-duty lampholder?

180 VA
300 VA
600 VA
1,200 VA

NEC Reference: NEC 220.14(E)

Question 22: How may branch circuits for fixed electric space-heating equipment be arranged?

Only individual branch circuits
Individual, or 15–30 A multioutlet
Only 40 A multioutlet circuits
Only on the furnace circuit

NEC Reference: NEC 424.3(A)

Question 23: Of what material may a bonding jumper be made?

Any grade of steel
Cu, Al, Cu-clad Al or similar
Copper only
Aluminum only

NEC Reference: NEC 250.102(A)

Question 24: Overcurrent devices must generally be readily accessible. Which of these is permitted to be reached by portable means (such as a ladder)?

The service main breaker
Dwelling panelboards
One next to the equipment it supplies
Any branch-circuit breaker

NEC Reference: NEC 240.24(A)

Question 25: In a dwelling living room, which of these counts as "wall space" for receptacle spacing?

A fireplace opening
The sliding panel of a glass door
A doorway
A fixed glass-door panel

NEC Reference: NEC 210.52(A)(2)

Question 26: Which dwelling area must have at least one wall switch-controlled lighting outlet?

Hallways, stairs, garages
Laundry chutes
Clothes closets
Pantries only

NEC Reference: NEC 210.70(A)(2)(1)

Question 27: In a dwelling crawl space, which lighting outlets require GFCI protection?

None
120 V or less lighting outlets
Only LED lighting
Only those on 20 A circuits

NEC Reference: NEC 210.8(C)

Question 28: What does 600.3 require of electric signs and outline lighting systems?

Nothing; site-built signs need no listing
Only GFCI protection
They must be painted
Listed, labeled and installed per listing

NEC Reference: NEC 600.3

Question 29: A circuit draws current but its true power (watts) is zero. What kind of load is it?

A short circuit
Purely resistive
Purely reactive
An open circuit

Question 30: A panelboard has an installed breaker that is not connected to any circuit. How must it be identified in the circuit directory?

Described as spare (unused)
Marked with the date installed
Removed from the directory
Left blank

NEC Reference: NEC 408.4(A)

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 38

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Journeyman Electrician Practice Test 38 — Question List

Question 1: What is the maximum load a mobile home may be supplied with through a power-supply cord (above which a permanent feeder is required)?

Question 2: An electric pool water heater draws 60 A. What does 680.10 require for its heating elements?

Question 3: Conductors smaller than 1/0 AWG are generally not permitted in parallel. For which use does the exception permit smaller parallel conductors?

Question 4: Where may 300-volt-type cartridge fuses be used?

Question 5: Overhead service conductors operating at more than 300 V to ground pass over a residential driveway. What is the minimum clearance?

Question 6: Why does a voltmeter have a very high internal resistance?

Question 7: The primary of transformer draws 5 amperes at 480 volts. The voltmeter reading at secondary is 240 volts. What is its ammeter reading at secondary?

Question 8: When may a line-voltage thermostat serve as both the controller and the disconnecting means for electric space heating?

Question 9: In a dwelling dining room, may a switch-controlled receptacle (used instead of a lighting outlet) be supplied from a general-purpose 15-ampere circuit?

Question 10: A lighting unit is connected on a 20 ampere branch circuit on which a fastened-in place appliance is located. What is the maximum percentage branch circuit rating is permitted on the appliance?

Question 11: Per NEC 406.12, all nonlocking-type, 125-volt, 15- and 20-ampere receptacles installed in the locations specified in NEC 210.52 (standard dwelling unit receptacle locations) shall be _____ .

Question 12: A luminaire is installed in or under metal roof decking. What clearance must it maintain from the lowest surface of the decking?

Question 13: May a motor controller also serve as the motor overload device?

Question 14: Rooftop air-conditioning equipment is supplied through EMT with non-threaded (set-screw or compression) fittings outdoors. What does 440.9 require?

Question 15: How must a constant-voltage generator be protected from overload?

Question 16: A 480-volt transformer has a rated primary current of 20 A. Secondary protection is provided at not more than 125%. What is the maximum primary overcurrent device rating?

Question 17: How must flexible cords be connected to devices and fittings?

Question 18: May liquidtight flexible metal conduit (LFMC) be direct buried?

Question 19: May EMT be threaded in the field?

Question 20: A 1,600 A, 480Y/277-volt service supplies a continuous industrial process where a sudden shutdown would create additional hazards. Is ground-fault protection of equipment required on the service disconnect?

Question 21: In a load calculation, what minimum load is used for each outlet supplying a heavy-duty lampholder?

Question 22: How may branch circuits for fixed electric space-heating equipment be arranged?

Question 23: Of what material may a bonding jumper be made?

Question 24: Overcurrent devices must generally be readily accessible. Which of these is permitted to be reached by portable means (such as a ladder)?

Question 25: In a dwelling living room, which of these counts as "wall space" for receptacle spacing?

Question 26: Which dwelling area must have at least one wall switch-controlled lighting outlet?

Question 27: In a dwelling crawl space, which lighting outlets require GFCI protection?

Question 28: What does 600.3 require of electric signs and outline lighting systems?

Question 29: A circuit draws current but its true power (watts) is zero. What kind of load is it?

Question 30: A panelboard has an installed breaker that is not connected to any circuit. How must it be identified in the circuit directory?

Key NEC References for This Test

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