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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 8

This is Journeyman Electrician Practice Test 8 — a free, exam-style practice test based on the 2023 NEC. The 30 questions follow the PSI journeyman exam outline: high-impedance grounding, EGC continuity in boxes, the existing-dwelling load calculation, neutral current, conduit fill with mixed sizes, PV circuit sizing, multimotor branch circuits, pool pump GFCI, fan boxes and transformers in hollow spaces. You need 70% or higher to pass. Every question includes the NEC reference and a step-by-step explanation.

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
Full explanation with NEC reference shown after you submit

What This Test Covers

Hazardous location seal fill limit (NEC 501.15)
Low voltage circuit lamp holder rating (NEC 720.5)
Outline lighting clearance above vehicles (NEC 600.9)
Solidly grounded system definition (NEC 100)
Cabinet airspace requirements (NEC 312.11)
Feeder voltage drop recommendation (NEC 215.2)
Conductor sizing for 35A circuit (NEC 110.14)
Motor overload fuse placement (NEC 430.36)
Overhead service clearance above roof (NEC 230.24)
Minimum 3-wire service for small residence (NEC 230.79)
Service entrance minimum conductor size (NEC 230.31)
Multiple motor fuse sizing (NEC 430.52)
Open circuit indication
Transformer theory: step-up transformers
Inductive and capacitive loads in AC circuits
Class III hazardous location definition (NEC 503)
Swimming pool receptacle location (NEC 680.22)
Multiple motor feeder sizing (NEC 430.17)

Tip: Pay attention to True/False questions — read them carefully before choosing.

Questions

75 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

Student Reviews 5.0 / 5 · 1 review

Bobby Crane

Pretty close to the real thing. I took my test in Texas and a handful of questions were almost word for word. Not saying they're the exact same obviously but the topics and difficulty felt right. Five stars.

Journeyman Electrician Practice Test 8 — Question List

Question 1: A high-impedance grounded neutral system is permitted for 3-phase AC systems of 480 V to 1,000 V only where several conditions are met. Which is one of those conditions?

Ground detectors are installed on the system
The system is installed in a dwelling unit
Line-to-neutral loads are served from the system
The impedance device is installed in the neutral at each panel

NEC Reference: NEC 250.36

Question 2: In a dwelling, which cord-and-plug-connected appliance is NOT required to have its exposed metal parts connected to an equipment grounding conductor?

A clothes washer in the laundry
A refrigerator in the kitchen
A sump pump in the basement
A listed double-insulated hand tool

NEC Reference: NEC 250.114

Question 3: In a metal box where several equipment grounding conductors are spliced, how must the grounding connections be arranged?

So removing a device does not break grounding continuity
Each EGC landed on a separate terminal of the device
With all EGCs terminated only on the receptacle screw
Left unconnected, because the metal box bonds them

NEC Reference: NEC 250.148(B)

Question 4: On the load side of the service disconnecting means, may the grounded (neutral) conductor be used to ground the metal frame of new equipment?

Yes, in any occupancy, provided the neutral is fully insulated
Yes, provided the neutral conductor is 10 AWG or larger
Yes, but only for equipment located inside a dwelling unit
No, except limited cases like existing range and dryer circuits

NEC Reference: NEC 250.142(B)

Question 5: What is the minimum copper grounding electrode conductor for a service with 1/0 AWG copper service-entrance conductors (water pipe and concrete-encased electrodes)?

8 AWG
6 AWG
4 AWG
2 AWG

NEC Reference: NEC Table 250.66

Question 6: A balanced 3-phase, 480-volt load uses 50 kW at a power factor of 0.90. What is the line current?

55.1 A
60.1 A
66.8 A
104.2 A

Question 7: On a 120/240-volt, 3-wire circuit, the 120-volt loads draw 40 A on line 1 and 25 A on line 2. How much current flows in the neutral?

65 A
40 A
25 A
15 A

Question 8: An existing dwelling has 24 kVA of existing loads (no heating or A/C). A new 5 kVA air conditioner is being added. Using 220.83(B), what is the calculated load?

29.0 kVA
19.4 kVA
14.4 kVA
13.6 kVA

NEC Reference: NEC 220.83(B)

Question 9: In a dwelling laundry room, a 125-volt receptacle is located 4 ft from a utility sink. GFCI protection is required when the receptacle is within what distance of the top inside edge of the sink bowl?

3 ft
4 ft
6 ft
10 ft

NEC Reference: NEC 210.8(A)(7)

Question 10: A dwelling deck is accessible from inside the house and has 120 sq ft of floor area. What does the NEC require?

One receptacle, but only if the deck has a permanent roof
One receptacle for every 12 ft along the deck's outer edge
None; receptacles are not required on decks or porches
One receptacle reachable from the deck, max 6½ ft above it

NEC Reference: NEC 210.52(E)(3)

Question 11: The disconnecting means for a separate building supplied by a feeder must be installed:

Outside, or inside nearest the point where conductors enter
Anywhere inside the separate building that is convenient
At the main building panelboard only, not at the garage
On the nearest utility pole that serves the property

NEC Reference: NEC 225.32

Question 12: Where a terminal tightening torque value is indicated on equipment or in its installation instructions, how must the connection be tightened?

With a calibrated torque tool (unless another method is given)
With any power driver set to its highest clutch setting
Any method; listed torque values are only recommendations
By hand with a screwdriver until the screw feels snug

NEC Reference: NEC 110.14(D)

Question 13: How does 90.3 describe the relationship between NEC Chapters 1–4 and Chapters 5–7?

Chapters 5–7 apply only to one- and two-family dwellings
Chapters 1–4 apply only to communications and data systems
Chapters 5–7 completely replace Chapters 1–4 when used
Chapters 1–4 apply generally; 5–7 supplement or modify them

NEC Reference: NEC 90.3

Question 14: A transformer has a 480-volt primary and a 120-volt secondary. The secondary load current is 40 A. Neglecting losses, what is the primary current?

4 A
10 A
40 A
160 A

Question 15: A 6 AWG THWN copper conductor (75 °C) is installed where the ambient temperature is 20 °C. What is its corrected ampacity?

58.5 A
65.0 A
72.2 A
81.0 A

NEC Reference: NEC Table 310.15(B)(1)(1)

Question 16: A 3/4 in. EMT raceway (40% area = 0.213 sq in.) will contain four 12 AWG THHN (0.0133 sq in. each) and two 10 AWG THHN (0.0211 sq in. each). What is the total conductor area, and does it fit?

0.0532 sq in.; it fits
0.0954 sq in.; it fits
0.1266 sq in.; it fits
0.2130 sq in.; it does not fit

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

Question 17: Type NM cable is NOT permitted to be installed:

In wet or damp locations
Concealed in wood-frame walls
Through bored holes in floor joists
In a dry attic of a one-family dwelling

NEC Reference: NEC 334.12(B)(4)

Question 18: A condensing unit nameplate shows a maximum overcurrent protection of 30 A, and the manufacturer's minimum circuit ampacity allows 12 AWG copper. May 12 AWG be protected by a 30 A breaker?

Only if the breaker is a GFCI type rated for the unit
No; 12 AWG copper is always limited to a 20 A device
Only if the conductors are aluminum instead of copper
Yes; 240.4(G) sends A/C circuits to the Article 440 rules

NEC Reference: NEC 240.4(G)

Question 19: An adjustable-trip circuit breaker has a maximum possible setting of 400 A but is set at 300 A. It is not covered by restricted-access means. What is its rating for code purposes?

400 A
The average of the two settings
350 A
300 A

NEC Reference: NEC 240.6(B)

Question 20: Several motors, each 1 hp or less, are to share one 120-volt branch circuit. Which condition must be met?

Each motor is 2 hp or less and the circuit is rated 30 A
None of the motors needs individual overload protection
All of the motors are 3-phase and have the same rating
Each motor FLC is 6 A or less; circuit protected at 20 A max

NEC Reference: NEC 430.53(A)

Question 21: What is the minimum size THWN copper branch-circuit conductor (75 °C terminals) for a 15 hp, 208-volt, 3-phase induction motor?

8 AWG
6 AWG
4 AWG
3 AWG

NEC Reference: NEC 430.22 and Table 430.250

Question 22: A PV source circuit has a module short-circuit current (Isc) of 10 A. What minimum ampacity must the circuit conductors have, before any correction or adjustment?

10.0 A
12.5 A
15.6 A
20.0 A

NEC Reference: NEC 690.8(A) and (B)

Question 23: Outlets supplying swimming pool pump motors on branch circuits rated 150 V or less to ground and 60 A or less must have:

Arc-fault circuit-interrupter protection on the circuit
GFCI protection, whether cord-and-plug or direct wired
No added protection if the motor frame is grounded
GFCI only when the pump is cord-and-plug connected

NEC Reference: NEC 680.21

Question 24: A location where flammable liquids are handled in closed containers and can escape only through accidental rupture or abnormal operation is classified as:

Class I, Division 1
Class II, Division 1
Class I, Division 2
Unclassified

NEC Reference: NEC 500.5(B)(2)

Question 25: Unless the equipment is serviced by qualified personnel under engineering supervision, pier power distribution systems at a marina must not exceed what voltage, phase to phase?

120 V
250 V
480 V
600 V

NEC Reference: NEC 555.5

Question 26: A receptacle in a dwelling bedroom (an area requiring AFCI protection) is being replaced. Which replacement complies?

Any standard receptacle, since replacements are exempt
A GFCI receptacle, with no arc-fault protection needed
A tamper-resistant receptacle with no other protection
An outlet branch-circuit AFCI receptacle, or AFCI-protected one

NEC Reference: NEC 406.4(D)(4)

Question 27: Switches may not be installed within tub or shower spaces unless:

They are part of a listed tub or shower assembly
They are GFCI protected and mounted above the tub
They are mounted at least 5 ft above the tub rim
They are rated 20 A or more and are weatherproof

NEC Reference: NEC 404.4(C)

Question 28: An outlet box listed for ceiling-suspended (paddle) fan support may be the sole support of a fan weighing up to:

35 lb, and no weight marking is ever needed
50 lb, the same limit as a luminaire box
70 lb; boxes for fans over 35 lb show the max weight
100 lb, provided two support screws are used

NEC Reference: NEC 314.27(C)

Question 29: What is the maximum spacing between supports for 2 in. rigid PVC conduit?

3 ft
5 ft
6 ft
8 ft

NEC Reference: NEC Table 352.30

Question 30: Dry-type transformers of 1,000 V or less are permitted in hollow spaces of buildings that are not permanently closed in by structure if they are rated not over:

15 kVA
37.5 kVA
50 kVA
112.5 kVA

NEC Reference: NEC 450.13(B)

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 8

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Journeyman Electrician Practice Test 8

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Journeyman Electrician Practice Test 8 — Question List

Question 1: A high-impedance grounded neutral system is permitted for 3-phase AC systems of 480 V to 1,000 V only where several conditions are met. Which is one of those conditions?

Question 2: In a dwelling, which cord-and-plug-connected appliance is NOT required to have its exposed metal parts connected to an equipment grounding conductor?

Question 3: In a metal box where several equipment grounding conductors are spliced, how must the grounding connections be arranged?

Question 4: On the load side of the service disconnecting means, may the grounded (neutral) conductor be used to ground the metal frame of new equipment?

Question 5: What is the minimum copper grounding electrode conductor for a service with 1/0 AWG copper service-entrance conductors (water pipe and concrete-encased electrodes)?

Question 6: A balanced 3-phase, 480-volt load uses 50 kW at a power factor of 0.90. What is the line current?

Question 7: On a 120/240-volt, 3-wire circuit, the 120-volt loads draw 40 A on line 1 and 25 A on line 2. How much current flows in the neutral?

Question 8: An existing dwelling has 24 kVA of existing loads (no heating or A/C). A new 5 kVA air conditioner is being added. Using 220.83(B), what is the calculated load?

Question 9: In a dwelling laundry room, a 125-volt receptacle is located 4 ft from a utility sink. GFCI protection is required when the receptacle is within what distance of the top inside edge of the sink bowl?

Question 10: A dwelling deck is accessible from inside the house and has 120 sq ft of floor area. What does the NEC require?

Question 11: The disconnecting means for a separate building supplied by a feeder must be installed:

Question 12: Where a terminal tightening torque value is indicated on equipment or in its installation instructions, how must the connection be tightened?

Question 13: How does 90.3 describe the relationship between NEC Chapters 1–4 and Chapters 5–7?

Question 14: A transformer has a 480-volt primary and a 120-volt secondary. The secondary load current is 40 A. Neglecting losses, what is the primary current?

Question 15: A 6 AWG THWN copper conductor (75 °C) is installed where the ambient temperature is 20 °C. What is its corrected ampacity?

Question 16: A 3/4 in. EMT raceway (40% area = 0.213 sq in.) will contain four 12 AWG THHN (0.0133 sq in. each) and two 10 AWG THHN (0.0211 sq in. each). What is the total conductor area, and does it fit?

Question 17: Type NM cable is NOT permitted to be installed:

Question 18: A condensing unit nameplate shows a maximum overcurrent protection of 30 A, and the manufacturer's minimum circuit ampacity allows 12 AWG copper. May 12 AWG be protected by a 30 A breaker?

Question 19: An adjustable-trip circuit breaker has a maximum possible setting of 400 A but is set at 300 A. It is not covered by restricted-access means. What is its rating for code purposes?

Question 20: Several motors, each 1 hp or less, are to share one 120-volt branch circuit. Which condition must be met?

Question 21: What is the minimum size THWN copper branch-circuit conductor (75 °C terminals) for a 15 hp, 208-volt, 3-phase induction motor?

Question 22: A PV source circuit has a module short-circuit current (Isc) of 10 A. What minimum ampacity must the circuit conductors have, before any correction or adjustment?

Question 23: Outlets supplying swimming pool pump motors on branch circuits rated 150 V or less to ground and 60 A or less must have:

Question 24: A location where flammable liquids are handled in closed containers and can escape only through accidental rupture or abnormal operation is classified as:

Question 25: Unless the equipment is serviced by qualified personnel under engineering supervision, pier power distribution systems at a marina must not exceed what voltage, phase to phase?

Question 26: A receptacle in a dwelling bedroom (an area requiring AFCI protection) is being replaced. Which replacement complies?

Question 27: Switches may not be installed within tub or shower spaces unless:

Question 28: An outlet box listed for ceiling-suspended (paddle) fan support may be the sole support of a fan weighing up to:

Question 29: What is the maximum spacing between supports for 2 in. rigid PVC conduit?

Question 30: Dry-type transformers of 1,000 V or less are permitted in hollow spaces of buildings that are not permanently closed in by structure if they are rated not over:

Key NEC References for This Test

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