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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 40

Free Online Journeyman Electrician Exam Practice Test — 40This free 30-question practice test covers journeyman exam topics based on the 2023 NEC, including minimum service size for dwellings (NEC 230.79), receptacle load demand factors (NEC 220.44), feeder voltage drop (NEC 215.2), emergency storage battery voltage (NEC 700.12), low-voltage lighting systems (NEC 411), branch circuit calculations, grounding-type receptacles (NEC 406.4), ITC cable limits (NEC 727.4), service drop clearances (NEC 230.24), and energy cost 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: One-family dwelling minimum service = 100A 3-wire (NEC 230.79(C)). Non-dwelling receptacle demand: first 10 kVA at 100%, remainder at 50% (NEC Table 220.44). Feeder voltage drop recommendation ≤3% (NEC 215.2(A)(1) Informational Note). Emergency battery must maintain ≥87.5% of system voltage (NEC 700.12(A)). Low-voltage lighting = ≤30V (NEC 411.1). ITC cable ≤5A at 150V (NEC 727.4). Service drops over 300V require 15 ft minimum clearance (NEC 230.24(B)(3)).

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75 min

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Journeyman Electrician Practice Test 40 — Question List

Question 1: A small building is served by a service supplying only two 2-wire branch circuits. What is the minimum rating of the service disconnect?

100 A
60 A
30 A
15 A

NEC Reference: NEC 230.79(B)

Question 2: Under the 2023 NEC, how is an EV supply equipment (EVSE) load calculated for a feeder or service?

It is not included at all
At 180 VA per outlet
At 50% of the nameplate
7,200 VA or nameplate, if larger

NEC Reference: NEC 220.57

Question 3: Before feeders are installed, what may the authority having jurisdiction require?

Nothing beyond the permit
A diagram showing feeder details
A letter from the serving utility
A photograph of the panel

NEC Reference: NEC 215.5

Question 4: Who must conduct or witness a test of a complete emergency system when it is installed?

The building owner only
The serving utility
The authority having jurisdiction
No test is required

NEC Reference: NEC 700.3(A)

Question 5: An LED luminaire is surface mounted over a concealed junction box and is not designed to be supported solely by the box. What must it have?

Nothing special
A GFCI device
A separate disconnect
Back openings for access to the box

NEC Reference: NEC 410.24(B)

Question 6: In dwelling units, what is the maximum voltage between conductors supplying the terminals of luminaires and cord-and-plug loads of 1,440 VA or less?

120 V
150 V
240 V
277 V

NEC Reference: NEC 210.6(A)

Question 7: How far must a receptacle face project from a metal faceplate after installation?

At least 0.015 in.
Flush only
At least ¼ in.
It must be recessed

NEC Reference: NEC 406.5(D)

Question 8: At a one-family dwelling, what is the maximum length of the bonding conductor from a communications primary protector to the intersystem bonding termination?

6 ft
10 ft
20 ft
50 ft

NEC Reference: NEC 800.100(A)

Question 9: What is required of a raceway-type service mast that supports the service drop?

Nothing beyond the meter base
Adequate strength; identified fittings
It must be PVC conduit
It must be at least 10 ft tall

NEC Reference: NEC 230.28(A)

Question 10: What is the operating cost of 1 watt electric clock for two years at 2 cents per kwh?

30 cents
70 cents
35 cents
55 cents

Question 11: How is a flexible cord protected against overcurrent?

Always at 15 A
It needs no overcurrent protection
Per its Table 400.5 ampacity (or 240.5(B))
Only by the appliance switch

NEC Reference: NEC 240.5(A)

Question 12: NM cable is laid in a notch cut in a wood stud. What is required?

Nothing is required
A 1/16 in. steel plate over the notch
A plastic grommet in the notch
Electrical tape over the cable

NEC Reference: NEC 300.4(A)(2)

Question 13: Generally, how many feeders or branch circuits may supply a separate building on the same property?

One per floor
As many as needed
Two
One, unless an exception applies

NEC Reference: NEC 225.30

Question 14: What is the maximum rating of an inverse time circuit breaker protecting a wound-rotor motor, as a percentage of full-load current (Table 430.52)?

300%
250%
175%
150%

NEC Reference: NEC 430.52 and Table 430.52

Question 15: May lighting and power circuits be connected to a system containing trolley wires with a ground return?

No, except in railway car houses and stations
Yes, always
Only below 300 V
Only with GFCI protection

NEC Reference: NEC 110.19

Question 16: How is the grounding electrode conductor sized at a separate building supplied by a feeder?

Same as the main building GEC
Always 6 AWG copper
From Table 250.122
Table 250.66, largest feeder conductor

NEC Reference: NEC 250.32(E)

Question 17: What is the minimum EGC size in a flexible cord whose largest circuit conductor is 14 AWG?

Any size at all
Always 10 AWG
At least 18 AWG and the circuit size
Always 8 AWG

NEC Reference: NEC 250.122(E)

Question 18: A nonmetallic box (not listed in Table 314.16(A)) is used. How is its volume determined?

From its marked volume
By measuring its outside dimensions
By using 18 cu in. for all such boxes
It does not matter for nonmetallic boxes

NEC Reference: NEC 314.16(A)

Question 19: How are loads for motor outlets calculated in a branch-circuit or feeder load calculation?

At 180 VA each
Per 430.22, 430.24 and 440.6
At the breaker rating
At 1,500 VA each

NEC Reference: NEC 220.14(C)

Question 20: What two things must overhead service conductors have?

Green insulation and a drip loop
A 3-hour fire rating
Enough ampacity and mechanical strength
Aluminum construction

NEC Reference: NEC 230.23(A)

Question 21: A submersible pump is installed in a metal well casing. What does 250.112(M) require?

A separate ground rod beside the well
Bond the casing to the pump EGC
Nothing
Insulating the casing

NEC Reference: NEC 250.112(M)

Question 22: Per NEC 110.12, electrical equipment shall be installed in a _____ manner.

Temporary
Neat and workmanlike
Minimum cost
Self-supporting without fasteners

NEC Reference: NEC 110.12

Question 23: Under the 2023 NEC, the receptacle required near HVAC equipment (210.63) must have:

GFCI protection
AFCI protection
A weatherproof cover only
A 30 A rating

NEC Reference: NEC 210.8(E)

Question 24: Where must the grounding electrode conductor for a single separately derived system connect to the derived system?

At the main service panel
At the nearest water pipe only
At the first downstream panelboard
Where the system bonding jumper connects

NEC Reference: NEC 250.30(A)(5)

Question 25: A 200 A feeder supplies the entire load of an individual dwelling unit. Using the 83% rule of 310.12, what minimum ampacity may the feeder conductors have?

166 A
183 A
200 A
250 A

NEC Reference: NEC 310.12

Question 26: An outlet box is fitted with a listed locking support and mounting receptacle (a separable attachment fitting). What may it support?

Only a smoke alarm
A fixture using a compatible listed fitting
Nothing; it is not permitted
Any appliance plugged into it

NEC Reference: NEC 314.27(E)

Question 27: Per NEC 330.10, Type MC (metal-clad) cable is permitted to be installed in which of the following locations that Type NM cable is NOT permitted?

Dry interior walls only
Wet locations (where listed for wet use)
Class I Division 1 hazardous locations without special fittings
Embedded directly in concrete slabs

NEC Reference: NEC 330.10

Question 28: Rooms or enclosures containing vented storage batteries must be provided with what?

Ventilation against explosive gas
Extra lighting
Heating
A sprinkler system

NEC Reference: NEC 480.10(A)

Question 29: What may a branch circuit rated larger than 50 A supply?

General-purpose receptacles
Lighting outlets
Only nonlighting outlet loads
Any load

NEC Reference: NEC 210.23(D)

Question 30: What is the requirement for the ampere rating of outlet devices (such as receptacles and lampholders)?

It must equal the branch-circuit rating
Always 20 A
Always 15 A
Not less than the load to be served

NEC Reference: NEC 210.20(D)

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 40

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Journeyman Electrician Practice Test 40 — Question List

Question 1: A small building is served by a service supplying only two 2-wire branch circuits. What is the minimum rating of the service disconnect?

Question 2: Under the 2023 NEC, how is an EV supply equipment (EVSE) load calculated for a feeder or service?

Question 3: Before feeders are installed, what may the authority having jurisdiction require?

Question 4: Who must conduct or witness a test of a complete emergency system when it is installed?

Question 5: An LED luminaire is surface mounted over a concealed junction box and is not designed to be supported solely by the box. What must it have?

Question 6: In dwelling units, what is the maximum voltage between conductors supplying the terminals of luminaires and cord-and-plug loads of 1,440 VA or less?

Question 7: How far must a receptacle face project from a metal faceplate after installation?

Question 8: At a one-family dwelling, what is the maximum length of the bonding conductor from a communications primary protector to the intersystem bonding termination?

Question 9: What is required of a raceway-type service mast that supports the service drop?

Question 10: What is the operating cost of 1 watt electric clock for two years at 2 cents per kwh?

Question 11: How is a flexible cord protected against overcurrent?

Question 12: NM cable is laid in a notch cut in a wood stud. What is required?

Question 13: Generally, how many feeders or branch circuits may supply a separate building on the same property?

Question 14: What is the maximum rating of an inverse time circuit breaker protecting a wound-rotor motor, as a percentage of full-load current (Table 430.52)?

Question 15: May lighting and power circuits be connected to a system containing trolley wires with a ground return?

Question 16: How is the grounding electrode conductor sized at a separate building supplied by a feeder?

Question 17: What is the minimum EGC size in a flexible cord whose largest circuit conductor is 14 AWG?

Question 18: A nonmetallic box (not listed in Table 314.16(A)) is used. How is its volume determined?

Question 19: How are loads for motor outlets calculated in a branch-circuit or feeder load calculation?

Question 20: What two things must overhead service conductors have?

Question 21: A submersible pump is installed in a metal well casing. What does 250.112(M) require?

Question 22: Per NEC 110.12, electrical equipment shall be installed in a _____ manner.

Question 23: Under the 2023 NEC, the receptacle required near HVAC equipment (210.63) must have:

Question 24: Where must the grounding electrode conductor for a single separately derived system connect to the derived system?

Question 25: A 200 A feeder supplies the entire load of an individual dwelling unit. Using the 83% rule of 310.12, what minimum ampacity may the feeder conductors have?

Question 26: An outlet box is fitted with a listed locking support and mounting receptacle (a separable attachment fitting). What may it support?

Question 27: Per NEC 330.10, Type MC (metal-clad) cable is permitted to be installed in which of the following locations that Type NM cable is NOT permitted?

Question 28: Rooms or enclosures containing vented storage batteries must be provided with what?

Question 29: What may a branch circuit rated larger than 50 A supply?

Question 30: What is the requirement for the ampere rating of outlet devices (such as receptacles and lampholders)?

Key NEC References for This Test

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