Next Journeyman Electrician Practice Test 2

JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 1

This is Journeyman Electrician Practice Test 1 — a free, exam-style practice test based on the 2023 NEC. The 30 multiple-choice questions follow the PSI journeyman exam outline: grounding and bonding, load and voltage-drop calculations, services and feeders, conductor ampacity with correction and adjustment factors, overcurrent protection, motors, transformers, hazardous locations and special equipment. You need 70% or higher to pass. Every question includes the NEC reference and a step-by-step explanation.

TOPICS COVERED

journeyman electrician

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 (timer starts when you begin)
Pass score is 70% — you need at least 21 correct answers
Full explanation shown for every question after you submit

Topics in This Test

Ohm's Law and basic electrical calculations (voltage, current, resistance)
Motor disconnecting means — how to size them correctly (115% rule)
Conductor sizing for motors and transformers
Panelboard overcurrent protection rules (NEC 408.36)
GFCI requirements in bathrooms (NEC 210.8)
Grounding electrodes — allowed and not allowed materials (NEC 250.52)
Overhead conductor minimum sizes for outside branch circuits (NEC 225.6)
Metal wireway fill and support spacing (NEC 376)
Voltage drop calculations — NEC 5% rule
Equipment grounding conductor sizing (NEC 250.122)

Tip: If you are unsure about a question, make your best guess and keep moving. Go back and review the explanations after you finish — that is where the real learning happens.

Questions

75 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

Student Reviews 5.0 / 5 · 1 review

Marcus T.

Passed my journeyman exam last Tuesday and honestly these tests played a big part in it. The wording on the questions is very similiar to what I saw on the actual exam. Definitly worth doing all of them before your test date.

Journeyman Electrician Practice Test 1 — Question List

Question 1: For swimming pools and similar installations, what is the "low voltage contact limit" for sinusoidal AC?

15 volts (RMS)
21.2 volts (RMS)
30 volts (RMS)
42.4 volts (RMS)

NEC Reference: NEC Article 100

Question 2: A service has two parallel sets of 3/0 AWG copper conductors per phase. What is the minimum size copper grounding electrode conductor run to the metal underground water pipe electrode, per Table 250.66?

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

NEC Reference: NEC Table 250.66

Question 3: Which of the following is NOT permitted to be used as a grounding electrode?

Metal underground gas piping system
20 ft of 1/2 in. rebar in a footing in direct contact with the earth
A ground ring of 2 AWG bare copper, 20 ft long
An 8 ft copper-clad steel ground rod

NEC Reference: NEC 250.52(B)

Question 4: Flexible cords and flexible cables are specifically NOT permitted to be used:

For pendants
For connection of portable appliances
For wiring of luminaires
As a substitute for the fixed wiring of a structure

NEC Reference: NEC 400.12(1)

Question 5: Metal wireways installed horizontally must be supported at intervals not exceeding:

15 ft
10 ft
5 ft
3 ft

NEC Reference: NEC 376.30(A)

Question 6: At a bulk storage plant (Article 515), rigid PVC conduit is permitted for underground wiring only where it is buried under at least how much cover?

6 in.
12 in.
18 in.
2 ft

NEC Reference: NEC 515.8(A)

Question 7: A 5 hp, 208-volt, single-phase motor is protected by an inverse time circuit breaker. What is the maximum breaker rating permitted using 430.52 and its first exception?

70 A
80 A
90 A
100 A

NEC Reference: NEC 430.52(C)(1)

Question 8: A panelboard is rated 225 amperes. What is the maximum rating of the overcurrent device that may protect it?

300 A
250 A
225 A
200 A

NEC Reference: NEC 408.36

Question 9: Open individual copper conductors (not supported by a messenger) run overhead as a 40 ft span between two buildings must be at least what size?

12 AWG
10 AWG
8 AWG
6 AWG

NEC Reference: NEC 225.6(A)(1)

Question 10: Under the 2023 NEC, which of these dwelling unit locations requires GFCI protection for 125-volt, 15- and 20-ampere receptacles?

Hallway
Bedroom
Living room
A finished basement used as a family room

NEC Reference: NEC 210.8(A)(5)

Question 11: A cord-and-attachment-plug-connected room air conditioner may be treated as a single motor unit when it is single-phase and rated not more than:

20 A and 125 V
30 A and 250 V
40 A and 250 V
50 A and 250 V

NEC Reference: NEC 440.62(A)

Question 12: A restaurant kitchen has five pieces of thermostatically controlled cooking equipment rated 12 kW, 10 kW, 8 kW, 5 kW and 3 kW. What is the feeder demand load using Table 220.56?

22.0 kW
26.6 kW
30.4 kW
38.0 kW

NEC Reference: NEC Table 220.56

Question 13: A 45 kVA, 3-phase transformer has a 480-volt primary and is protected on the primary side only. What is the maximum standard primary overcurrent device rating?

125 A
90 A
70 A
60 A

NEC Reference: NEC Table 450.3(B)

Question 14: A 20-ampere branch circuit normally wired with 12 AWG copper is increased to 10 AWG copper ungrounded conductors to limit voltage drop. What is the minimum copper equipment grounding conductor?

14 AWG
12 AWG
10 AWG
8 AWG

NEC Reference: NEC 250.122(B)

Question 15: Which condition would make a disconnecting means NOT "readily accessible" as defined in Article 100?

A portable ladder is needed to reach it
Its handle is 5 ft above the floor
It is in a basement mechanical room
It is behind a locked door, and the key is kept on site by maintenance staff

NEC Reference: NEC Article 100

Question 16: A balanced 15 kVA, 3-phase load is supplied at 208 volts. What is the line current?

72.1 A
41.6 A
36.1 A
24.0 A

Question 17: A 240-volt, single-phase load draws 40 A at a distance of 150 ft (one way) from the panel. The conductors are 8 AWG copper (16,510 cmil, K = 12.9). What is the voltage drop?

2.4 V
4.7 V
9.4 V
12.4 V

NEC Reference: NEC Chapter 9, Table 8

Question 18: A one-family dwelling has a 200-ampere, 120/240-volt, single-phase service. Using Table 310.12, what is the minimum size copper service-entrance conductor?

1/0 AWG
2/0 AWG
3/0 AWG
4/0 AWG

NEC Reference: NEC Table 310.12

Question 19: What is the minimum size copper equipment grounding conductor for a feeder protected by a 300-ampere circuit breaker?

6 AWG
4 AWG
3 AWG
2 AWG

NEC Reference: NEC Table 250.122

Question 20: Four current-carrying 3 AWG THWN-2 copper conductors are installed in one raceway where the ambient temperature is 40 °C. What is the adjusted ampacity of each conductor?

104.7 A
92.0 A
83.7 A
70.4 A

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

Question 21: Switches and circuit breakers used as switches must be installed so the center of the grip of the operating handle, in its highest position, is not more than how high above the floor or working platform?

5 ft 6 in.
6 ft
6 ft 7 in.
7 ft

NEC Reference: NEC 404.8(A)

Question 22: A feeder to a panelboard uses 2 AWG THWN copper conductors with an allowable ampacity of 115 A. What is the largest standard overcurrent device permitted to protect this feeder?

150 A
125 A
115 A
110 A

NEC Reference: NEC 240.4(B)

Question 23: A single ground rod does not have a resistance to earth of 25 ohms or less, so a supplemental electrode is installed. How far apart must the two rod electrodes be?

At least 6 ft
At least 8 ft
At least 4 ft
At least 10 ft

NEC Reference: NEC 250.53(A)(3)

Question 24: What is the minimum cover for Type UF cable buried directly under the driveway of a one-family dwelling (driveway used only for dwelling-related purposes)?

12 in.
18 in.
24 in.
30 in.

NEC Reference: NEC Table 300.5

Question 25: How must each outlet installed for charging electric vehicles be supplied?

By a multiwire branch circuit shared with the garage receptacles
By any 20 A general-purpose branch circuit
From the load side of a GFCI receptacle in the garage
By an individual branch circuit with no other outlets

NEC Reference: NEC 625.40

Question 26: In the NEC, the phrases "shall be permitted" and "shall not be required" identify:

Informational notes that are not enforceable
Mandatory rules
Requirements taken from another NFPA standard
Permissive rules

NEC Reference: NEC 90.5(B)

Question 27: In a Class I, Division 1 location, a conduit seal is required where conduit enters an explosionproof enclosure containing arcing devices. The seal must be within what distance of the enclosure?

36 in.
24 in.
18 in.
12 in.

NEC Reference: NEC 501.15(A)(1)

Question 28: How must an insulated grounded (neutral) conductor of size 10 AWG be identified?

By a continuous white or gray outer finish, or three continuous white or gray stripes on other than green insulation
By black insulation with white tape applied at each termination
By any color, provided it is marked at the panelboard directory
By green insulation with white stripes

NEC Reference: NEC 200.6(A)

Question 29: Service equipment in other than dwelling units must be field-marked with which information?

The maximum available fault current and the date the calculation was performed
The nominal voltage and the installer's license number
The arc-flash boundary and required PPE category
The service conductor size and length

NEC Reference: NEC 110.24(A)

Question 30: A non-grounding-type receptacle is replaced where no equipment grounding conductor exists in the box. A grounding-type receptacle is permitted if it is:

Bonded to the box with a short green jumper
Connected to a cold water pipe with a 14 AWG conductor
Connected to the grounded conductor at the receptacle
Supplied through a GFCI and marked "GFCI Protected" and "No Equipment Ground"

NEC Reference: NEC 406.4(D)(2)(c)

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 1

How this test works

Frequently Asked Questions

Before You Start

Topics in This Test

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Key NEC References for This Test

Journeyman Electrician Practice Test 1

How this test works

Frequently Asked Questions

Is this Journeyman Electrician Practice Test 1 free?

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What NEC edition is this test based on?

Before You Start

Topics in This Test

Student Reviews 5.0 / 5 · 1 review

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Journeyman Electrician Practice Test 1 — Question List

Question 1: For swimming pools and similar installations, what is the "low voltage contact limit" for sinusoidal AC?

Question 2: A service has two parallel sets of 3/0 AWG copper conductors per phase. What is the minimum size copper grounding electrode conductor run to the metal underground water pipe electrode, per Table 250.66?

Question 3: Which of the following is NOT permitted to be used as a grounding electrode?

Question 4: Flexible cords and flexible cables are specifically NOT permitted to be used:

Question 5: Metal wireways installed horizontally must be supported at intervals not exceeding:

Question 6: At a bulk storage plant (Article 515), rigid PVC conduit is permitted for underground wiring only where it is buried under at least how much cover?

Question 7: A 5 hp, 208-volt, single-phase motor is protected by an inverse time circuit breaker. What is the maximum breaker rating permitted using 430.52 and its first exception?

Question 8: A panelboard is rated 225 amperes. What is the maximum rating of the overcurrent device that may protect it?

Question 9: Open individual copper conductors (not supported by a messenger) run overhead as a 40 ft span between two buildings must be at least what size?

Question 10: Under the 2023 NEC, which of these dwelling unit locations requires GFCI protection for 125-volt, 15- and 20-ampere receptacles?

Question 11: A cord-and-attachment-plug-connected room air conditioner may be treated as a single motor unit when it is single-phase and rated not more than:

Question 12: A restaurant kitchen has five pieces of thermostatically controlled cooking equipment rated 12 kW, 10 kW, 8 kW, 5 kW and 3 kW. What is the feeder demand load using Table 220.56?

Question 13: A 45 kVA, 3-phase transformer has a 480-volt primary and is protected on the primary side only. What is the maximum standard primary overcurrent device rating?

Question 14: A 20-ampere branch circuit normally wired with 12 AWG copper is increased to 10 AWG copper ungrounded conductors to limit voltage drop. What is the minimum copper equipment grounding conductor?

Question 15: Which condition would make a disconnecting means NOT "readily accessible" as defined in Article 100?

Question 16: A balanced 15 kVA, 3-phase load is supplied at 208 volts. What is the line current?

Question 17: A 240-volt, single-phase load draws 40 A at a distance of 150 ft (one way) from the panel. The conductors are 8 AWG copper (16,510 cmil, K = 12.9). What is the voltage drop?

Question 18: A one-family dwelling has a 200-ampere, 120/240-volt, single-phase service. Using Table 310.12, what is the minimum size copper service-entrance conductor?

Question 19: What is the minimum size copper equipment grounding conductor for a feeder protected by a 300-ampere circuit breaker?

Question 20: Four current-carrying 3 AWG THWN-2 copper conductors are installed in one raceway where the ambient temperature is 40 °C. What is the adjusted ampacity of each conductor?

Question 21: Switches and circuit breakers used as switches must be installed so the center of the grip of the operating handle, in its highest position, is not more than how high above the floor or working platform?

Question 22: A feeder to a panelboard uses 2 AWG THWN copper conductors with an allowable ampacity of 115 A. What is the largest standard overcurrent device permitted to protect this feeder?

Question 23: A single ground rod does not have a resistance to earth of 25 ohms or less, so a supplemental electrode is installed. How far apart must the two rod electrodes be?

Question 24: What is the minimum cover for Type UF cable buried directly under the driveway of a one-family dwelling (driveway used only for dwelling-related purposes)?

Question 25: How must each outlet installed for charging electric vehicles be supplied?

Question 26: In the NEC, the phrases "shall be permitted" and "shall not be required" identify:

Question 27: In a Class I, Division 1 location, a conduit seal is required where conduit enters an explosionproof enclosure containing arcing devices. The seal must be within what distance of the enclosure?

Question 28: How must an insulated grounded (neutral) conductor of size 10 AWG be identified?

Question 29: Service equipment in other than dwelling units must be field-marked with which information?

Question 30: A non-grounding-type receptacle is replaced where no equipment grounding conductor exists in the box. A grounding-type receptacle is permitted if it is:

Key NEC References for This Test

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