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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 3

This is Journeyman Electrician Practice Test 3 — a free, exam-style practice test based on the 2023 NEC. The 30 questions follow the PSI journeyman exam outline: ground rods and bonding jumpers, range and dryer demand loads, voltage-drop conductor sizing, aluminum ampacity derating, motor conductors, conduit fill, health care and temporary wiring, PV rapid shutdown and transformer disconnects. You need 70% or higher to pass. Every question includes the NEC reference and a step-by-step explanation.

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How this test works

Read each question carefully

Look for absolute words like always / never — they often distinguish the right answer.

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Frequently Asked Questions

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.

Before You Start

30 questions — multiple choice
45 minutes to finish
Pass score is 70% — you need 21 or more correct answers
You will see the full answer and NEC reference after you submit

What This Test Covers

Basic electrical theory — resistance, current, and power (Ohm's Law)
Conductor ampacity from NEC tables (NEC 310.16)
Why circuits are grounded, and grounding electrode rules
EMT conduit — how often it must be fastened (NEC 358.30)
Panelboard busbar mounting rules (NEC 408.51)
Plug fuse voltage rating (NEC 240.5)
Parallel conductor requirements — same length, material, and insulation
Multi-speed motor branch circuit sizing — 125% rule (NEC 430.21)
Motor disconnect switch rating
Emergency transfer switch rating (NEC 700.5)
Demand load calculations for a dwelling unit (NEC 220)
Power, current, and transformer efficiency calculations

Tip: Some questions use a code table to find the answer. If your NEC codebook is nearby, use it. That is exactly what real exams let you do.

Questions

75 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

Student Reviews 5.0 / 5 · 1 review

Priya M.

I've been studing for my journeyman for about 3 months and started using this site maybe 6 weeks ago. Big difference in how confident I feel going into the exam. The explainations after each question are really what sold me on it.

Journeyman Electrician Practice Test 3 — Question List

Question 1: While driving an 8 ft ground rod, rock bottom is reached at 4 ft. What does the NEC permit?

Replace it with two 4 ft rods spaced 6 ft apart and bonded together
Lay the full rod horizontally in a trench at least 12 in. below finished grade
Cut the rod off at grade so that the 4 ft driven portion remains in contact with the soil
Drive it at an angle not exceeding 45° from vertical, or bury it in a trench at least 30 in. deep

NEC Reference: NEC 250.53(A)(4)

Question 2: Interior metal water piping may be used to interconnect grounding electrodes only if it is located within what distance of the point where the piping enters the building?

20 ft
10 ft
5 ft
2 ft

NEC Reference: NEC 250.68(C)(1)

Question 3: A service has 350 kcmil copper ungrounded conductors. What is the minimum size copper main bonding jumper?

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

NEC Reference: NEC 250.28(D)(1) and Table 250.102(C)(1)

Question 4: The bonding jumper that bonds an interior metal water piping system (not used as an electrode) to the service equipment is sized using:

Table 250.122, based on the largest branch-circuit breaker
Table 250.66 only when copper pipe is used
A fixed 6 AWG copper conductor in every case
Table 250.102(C)(1), based on the service-entrance conductor size

NEC Reference: NEC 250.104(A)(1)

Question 5: Listed flexible metal conduit (FMC) with listed fittings may serve as the equipment grounding conductor only where its total length in the ground return path does not exceed 6 ft and the circuit conductors are protected by overcurrent devices rated at not more than:

60 A
30 A
20 A
15 A

NEC Reference: NEC 250.118

Question 6: What is the demand load for one 14 kW household electric range?

8 kW
8.8 kW
11.2 kW
14 kW

NEC Reference: NEC Table 220.55, Note 1

Question 7: A dwelling has one 4,500-watt electric clothes dryer. What load must be used for the dryer in the standard load calculation?

6,000 VA
5,625 VA
5,000 VA
4,500 VA

NEC Reference: NEC 220.54

Question 8: A 480-volt, 3-phase feeder carries 100 A to a load 300 ft away. Using K = 12.9 for copper, what is the smallest copper conductor that keeps voltage drop at or below 3%?

4 AWG
3 AWG
2 AWG
1 AWG

NEC Reference: NEC Chapter 9, Table 8

Question 9: Along a dwelling kitchen wall countertop, receptacles must be installed so that no point along the wall line is more than what distance, measured horizontally, from a receptacle outlet in that space?

12 in.
18 in.
24 in.
48 in.

NEC Reference: NEC 210.52(C)(1)

Question 10: For an installation other than a one-family dwelling or a limited-load installation, the service disconnecting means must have a rating of not less than:

30 A
60 A
100 A
200 A

NEC Reference: NEC 230.79(D)

Question 11: A branch circuit supplies a 16 A continuous load and a 3 A noncontinuous load. The terminals are rated 60 °C. What is the minimum size copper branch-circuit conductor?

14 AWG
12 AWG
10 AWG
8 AWG

NEC Reference: NEC 210.19(A)(1) and 110.14(C)(1)(a)

Question 12: The working space in front of a panelboard must have a minimum height (headroom) of:

6 ft
6½ ft
7 ft
8 ft

NEC Reference: NEC 110.26(A)(3)

Question 13: Which equipment must be marked with a warning label about potential electric arc-flash hazards?

A panelboard in a commercial building that is likely to be examined or serviced while energized
A luminaire in a warehouse
A 15 A receptacle in an office
A panelboard in a one-family dwelling

NEC Reference: NEC 110.16(A)

Question 14: Three resistors of 6 Ω, 12 Ω and 12 Ω are connected in parallel across 120 volts. What is the total current?

4 A
10 A
20 A
40 A

Question 15: Which of these conductor insulation types is permitted in a wet location?

THWN
THHN
XHH
TFFN

NEC Reference: NEC Table 310.4(1)

Question 16: In a 45 °C boiler room, an aluminum feeder raceway holds four current-carrying 2/0 AWG XHHW-2 conductors. After applying both the temperature correction and the bundling adjustment, what ampacity may be used for each aluminum conductor?

130.5 A
120 A
104.4 A
88.6 A

NEC Reference: NEC 310.15(B)(1)(1) and 310.15(C)(1)

Question 17: Type MC cable with four or fewer conductors, 10 AWG and smaller, must be secured at intervals not exceeding what distance?

3 ft
4½ ft
6 ft
10 ft

NEC Reference: NEC 330.30(B)

Question 18: Which of the following is a standard ampere rating for fuses and inverse time circuit breakers?

110 A
115 A
140 A
160 A

NEC Reference: NEC 240.6(A)

Question 19: Circuit breakers used as switches in 120-volt and 277-volt fluorescent lighting circuits must be listed and marked:

HACR
GFPE
CO/ALR
SWD or HID

NEC Reference: NEC 240.83(D)

Question 20: What is the minimum size THWN copper branch-circuit conductor for a 7.5 hp, 230-volt, single-phase motor? All terminations are rated 75 °C.

10 AWG
8 AWG
6 AWG
4 AWG

NEC Reference: NEC 430.22 and Table 430.248

Question 21: A motor controller has a disconnecting means that is in sight from both the controller and the motor and its driven machinery. Is a second, separate disconnect required at the motor?

No, the controller disconnecting means may also serve as the motor disconnecting means
Only if the motor is over 2 hp
Yes, every motor needs its own disconnect at the motor
Only if the motor is 3-phase

NEC Reference: NEC 430.102(B)(2)

Question 22: The equipotential bonding grid conductor for a permanently installed swimming pool must be at least:

10 AWG stranded copper
8 AWG solid copper
6 AWG stranded aluminum
4 AWG bare stranded copper only

NEC Reference: NEC 680.26(B)

Question 23: For PV rapid shutdown, controlled conductors located outside the array boundary must be limited to what voltage within 30 seconds of rapid shutdown initiation?

600 V
80 V
30 V
15 V

NEC Reference: NEC 690.12(B)(1)

Question 24: Branch circuits serving patient care spaces in a health care facility must be installed with:

Any listed cable assembly, provided every receptacle in the space is GFCI protected
Type NM cable containing a full-size bare copper equipment grounding conductor
Schedule 80 PVC conduit containing a green insulated copper equipment grounding conductor
A metal wiring method that qualifies as an EGC under 250.118, plus an insulated copper EGC

NEC Reference: NEC 517.13

Question 25: On a construction site, which temporary receptacle outlets (not part of the permanent wiring) must have GFCI protection for personnel?

All 125-volt, single-phase 15-, 20- and 30-ampere receptacle outlets
Only receptacles supplied from a portable generator rather than the utility
Only receptacles installed within 6 ft of standing water or a wet location
Only 15-ampere, 125-volt receptacles that are used for portable hand tools

NEC Reference: NEC 590.6(A)(1)

Question 26: A 20-ampere branch circuit supplies two or more receptacles. What receptacle ratings are permitted?

15 A only
20 A only
15 A or 20 A
20 A or 30 A

NEC Reference: NEC Table 210.21(B)(3)

Question 27: Tap conductors run in a raceway from a luminaire outlet box to a recessed luminaire must be at least 18 in. long and not more than:

10 ft
6 ft
4 ft
3 ft

NEC Reference: NEC 410.117(C)

Question 28: How many 12 AWG THHN copper conductors may be installed in a 3/4 in. EMT raceway? (40% fill area = 0.213 sq in.; one 12 AWG THHN = 0.0133 sq in.)

NEC Reference: NEC Chapter 9, Table 1, Table 4 and Table 5

Question 29: For a straight pull of 4 AWG or larger conductors, the length of a pull box must be at least how many times the trade size of the largest raceway?

10 times
8 times
6 times
4 times

NEC Reference: NEC 314.28(A)(1)

Question 30: A transformer disconnecting means is installed out of sight of the transformer. What is required?

It must be located within 100 ft of the transformer and labeled at the panelboard
A second disconnecting means must always be installed at the transformer
Nothing additional, provided the disconnect is located in the same building
It must be lockable open, and its location must be field-marked on the transformer

NEC Reference: NEC 450.14

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 3

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Key NEC References for This Test

Journeyman Electrician Practice Test 3

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Before You Start

What This Test Covers

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Journeyman Electrician Practice Test 3 — Question List

Question 1: While driving an 8 ft ground rod, rock bottom is reached at 4 ft. What does the NEC permit?

Question 2: Interior metal water piping may be used to interconnect grounding electrodes only if it is located within what distance of the point where the piping enters the building?

Question 3: A service has 350 kcmil copper ungrounded conductors. What is the minimum size copper main bonding jumper?

Question 4: The bonding jumper that bonds an interior metal water piping system (not used as an electrode) to the service equipment is sized using:

Question 5: Listed flexible metal conduit (FMC) with listed fittings may serve as the equipment grounding conductor only where its total length in the ground return path does not exceed 6 ft and the circuit conductors are protected by overcurrent devices rated at not more than:

Question 6: What is the demand load for one 14 kW household electric range?

Question 7: A dwelling has one 4,500-watt electric clothes dryer. What load must be used for the dryer in the standard load calculation?

Question 8: A 480-volt, 3-phase feeder carries 100 A to a load 300 ft away. Using K = 12.9 for copper, what is the smallest copper conductor that keeps voltage drop at or below 3%?

Question 9: Along a dwelling kitchen wall countertop, receptacles must be installed so that no point along the wall line is more than what distance, measured horizontally, from a receptacle outlet in that space?

Question 10: For an installation other than a one-family dwelling or a limited-load installation, the service disconnecting means must have a rating of not less than:

Question 11: A branch circuit supplies a 16 A continuous load and a 3 A noncontinuous load. The terminals are rated 60 °C. What is the minimum size copper branch-circuit conductor?

Question 12: The working space in front of a panelboard must have a minimum height (headroom) of:

Question 13: Which equipment must be marked with a warning label about potential electric arc-flash hazards?

Question 14: Three resistors of 6 Ω, 12 Ω and 12 Ω are connected in parallel across 120 volts. What is the total current?

Question 15: Which of these conductor insulation types is permitted in a wet location?

Question 16: In a 45 °C boiler room, an aluminum feeder raceway holds four current-carrying 2/0 AWG XHHW-2 conductors. After applying both the temperature correction and the bundling adjustment, what ampacity may be used for each aluminum conductor?

Question 17: Type MC cable with four or fewer conductors, 10 AWG and smaller, must be secured at intervals not exceeding what distance?

Question 18: Which of the following is a standard ampere rating for fuses and inverse time circuit breakers?

Question 19: Circuit breakers used as switches in 120-volt and 277-volt fluorescent lighting circuits must be listed and marked:

Question 20: What is the minimum size THWN copper branch-circuit conductor for a 7.5 hp, 230-volt, single-phase motor? All terminations are rated 75 °C.

Question 21: A motor controller has a disconnecting means that is in sight from both the controller and the motor and its driven machinery. Is a second, separate disconnect required at the motor?

Question 22: The equipotential bonding grid conductor for a permanently installed swimming pool must be at least:

Question 23: For PV rapid shutdown, controlled conductors located outside the array boundary must be limited to what voltage within 30 seconds of rapid shutdown initiation?

Question 24: Branch circuits serving patient care spaces in a health care facility must be installed with:

Question 25: On a construction site, which temporary receptacle outlets (not part of the permanent wiring) must have GFCI protection for personnel?

Question 26: A 20-ampere branch circuit supplies two or more receptacles. What receptacle ratings are permitted?

Question 27: Tap conductors run in a raceway from a luminaire outlet box to a recessed luminaire must be at least 18 in. long and not more than:

Question 28: How many 12 AWG THHN copper conductors may be installed in a 3/4 in. EMT raceway? (40% fill area = 0.213 sq in.; one 12 AWG THHN = 0.0133 sq in.)

Question 29: For a straight pull of 4 AWG or larger conductors, the length of a pull box must be at least how many times the trade size of the largest raceway?

Question 30: A transformer disconnecting means is installed out of sight of the transformer. What is required?

Key NEC References for This Test

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