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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 15

This is Journeyman Electrician Practice Test 15 — a free, exam-style practice test based on the 2023 NEC. The 30 questions follow the PSI journeyman exam outline: common GECs for multiple transformers, isolated-ground receptacles, dwelling demand loads, power factor kVAR, service GFPE settings, SE cable limits, next-size-up protection, motor thermal protectors, EV receptacles, emergency coordination, marina EGCs, conduit fill and small transformer fuses. You need 70% or higher to pass. Every question includes the NEC reference and a step-by-step explanation.

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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.

This test covers grounding, motor protection, and basic electrical theory. Remember the wire color rule: GREEN or bare = equipment grounding conductor. WHITE or gray = neutral. Review NEC 250.66 (GEC sizing for ground rods), NEC 350.20 (LFMC), and NEC 240.51 (plug fuses) before you start.

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75 min

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Journeyman Electrician Practice Test 15 — Question List

Question 1: Several separately derived systems in a building share one common grounding electrode conductor. What is the minimum size of that common copper GEC?

250 kcmil
3/0 AWG
1/0 AWG
2 AWG

NEC Reference: NEC 250.30(A)(6)(a)

Question 2: A painted metal enclosure is to be bonded. What must be done with the paint at the contact points?

Leave it; paint does not affect the bond
Add a second coat of conductive paint over it
Cover the contact area with electrical tape
Remove it, or use fittings that cut through it

NEC Reference: NEC 250.12

Question 3: Which of these is NOT permitted to serve as an equipment grounding conductor?

Electrical nonmetallic tubing (ENT)
Electrical metallic tubing (EMT)
Intermediate metal conduit
Rigid metal conduit

NEC Reference: NEC 250.118

Question 4: May an equipment grounding conductor also serve as a grounding electrode conductor?

Yes, provided the EGC is a metal raceway
Yes; any EGC may also be used as a GEC
Only within dwelling units, never elsewhere
Only a wire-type EGC meeting both sets of rules

NEC Reference: NEC 250.121(A)

Question 5: For an isolated ground receptacle, the insulated equipment grounding conductor may pass through a subpanel without connecting to its ground bar. Where may it terminate?

At the service or derived-system EGC terminal
At any metal water pipe nearby
At the neutral bar of the nearest subpanel
At a ground rod beside the receptacle

NEC Reference: NEC 250.146(D)

Question 6: Using the standard method, a 3,000 sq ft dwelling with two small-appliance circuits and one laundry circuit has what demand load for these three loads?

4,725 VA
6,675 VA
8,250 VA
13,500 VA

NEC Reference: NEC 220.41, 220.52 and Table 220.45

Question 7: A 24 kW, 3-phase resistance heater is supplied at 240 volts. What is the line current?

173 A
100 A
57.7 A
33.3 A

Question 8: A 2-wire branch circuit of 12 AWG copper runs 250 ft one way. Using 1.98 ohms per 1,000 ft, what is the total resistance of the two conductors?

0.50 Ω
0.99 Ω
1.98 Ω
4.95 Ω

NEC Reference: NEC Chapter 9, Table 8

Question 9: In a multifamily building, the branch circuit for the common-area hallway lighting may NOT be supplied from:

A house panel that serves only common areas
Equipment owned by the building management
A separately metered panel for common loads
A panelboard that serves a dwelling unit

NEC Reference: NEC 210.25(B)

Question 10: The dwelling laundry receptacle outlet(s) must be supplied by at least one branch circuit rated:

50 A
30 A
20 A
15 A

NEC Reference: NEC 210.11(C)(2)

Question 11: Ground-fault protection of equipment is required on a 2,000 A, 480Y/277-volt service disconnect. What is the maximum ground-fault trip setting?

30 mA
100 A
1,200 A
3,000 A

NEC Reference: NEC 230.95(A)

Question 12: The required working space in front of a panelboard may be used for:

Nothing; it must be kept clear
A small desk, if it can be moved
Storage of tools and materials
Pipes, provided they are insulated

NEC Reference: NEC 110.26(B)

Question 13: Article 100 defines "utilization equipment" as equipment that:

Generates electric power for the building
Measures the electric energy used by a customer
Carries or controls electric energy as its main function
Uses electric energy for heating, lighting or similar purposes

NEC Reference: NEC Article 100

Question 14: A plant load is 100 kW at a power factor of 0.80 lagging. How much reactive power does it draw?

125 kVAR
75 kVAR
60 kVAR
20 kVAR

Question 15: May XHHW (not XHHW-2) conductors be installed in a wet location?

Yes, at its 75 °C wet rating
Only inside a raceway sealed at both ends
No; only THWN is permitted in wet locations
Only for conductors 1/0 AWG and larger

NEC Reference: NEC 310.10(C)

Question 16: Type SE (service-entrance) cable is NOT permitted to be installed:

Underground, with or without a raceway
On the outside of a building as service-entrance conductors
Where protected from physical damage
As interior branch-circuit wiring following Part II of Article 334

NEC Reference: NEC 338.12(A)

Question 17: A feeder uses 4/0 AWG aluminum conductors (75 °C terminations) supplying a panelboard. What is the largest standard breaker permitted to protect it?

175 A
180 A
200 A
225 A

NEC Reference: NEC 240.4(B) and Table 310.16

Question 18: How are plug fuses rated 15 A or less identified?

By a red-colored cap
By a square brass base
By a blue label only
By a hexagonal window or cap

NEC Reference: NEC 240.50(C)

Question 19: An adjustable-trip breaker has a maximum setting of 600 A but is set at 400 A. Its settings are behind a sealable cover accessible only to qualified persons. What rating may be used?

400 A, the adjusted setting
500 A, the average of the two
600 A, the maximum setting
800 A, the next frame size

NEC Reference: NEC 240.6(C)

Question 20: A motor has an integral thermal protector. Its full-load current is 12 A. What is the maximum trip current permitted for the thermal protector?

20.4 A
18.7 A
15.0 A
13.8 A

NEC Reference: NEC 430.32(A)(2)

Question 21: What is the minimum size copper branch-circuit conductor for a 15 hp, 460-volt, 3-phase motor (60 °C terminals)?

14 AWG
12 AWG
10 AWG
8 AWG

NEC Reference: NEC 430.22 and Table 430.250

Question 22: Which receptacles installed for electric vehicle charging must have GFCI protection for personnel?

None, EVSE has built-in protection
Only those outdoors
Only 15 A and 20 A ones
All of them

NEC Reference: NEC 625.54

Question 23: What does 700.32 require of the overcurrent devices in an emergency system?

Selective coordination with supply-side devices
They must all be current-limiting fuses
They must be rated 200% of the load served
They must all be GFCI-type devices

NEC Reference: NEC 700.32

Question 24: A textile mill where easily ignitible fibers are handled or processed is classified as:

Class III
Class II
Unclassified
Class I

NEC Reference: NEC 500.5(D)

Question 25: At a marina, what is the minimum size of the insulated copper equipment grounding conductor for branch circuits?

14 AWG
12 AWG
10 AWG
8 AWG

NEC Reference: NEC 555.37

Question 26: An outdoor receptacle in a wet location (where weather-resistant receptacles are required) is replaced. What type must the replacement be?

A hospital-grade type
Any standard receptacle
A weather-resistant type
An isolated ground type

NEC Reference: NEC 406.4(D)(6)

Question 27: An older cord-and-plug-connected vending machine has no built-in GFCI. How must it be protected?

An AFCI circuit breaker
A GFCI-protected outlet
A plug-in surge strip
No protection is needed

NEC Reference: NEC 422.51

Question 28: How many 3/0 AWG THHN copper conductors may be installed in 2 in. EMT? (40% area = 1.342 sq in.; one 3/0 THHN = 0.2679 sq in.)

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

Question 29: Boxes and conduit bodies must be installed so the wiring in them can be made accessible:

Only by cutting an access hole
Only by working from the attic
By removing a ceiling tile or drywall
Without removing any building part

NEC Reference: NEC 314.29(A)

Question 30: Three 50 kVA single-phase transformers are connected delta-delta. One unit fails and is removed, leaving an open-delta bank. What is the maximum 3-phase load the remaining two units can supply?

150 kVA
100 kVA
86.6 kVA
57.7 kVA

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 15

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Key NEC References for This Test

Journeyman Electrician Practice Test 15

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Journeyman Electrician Practice Test 15 — Question List

Question 1: Several separately derived systems in a building share one common grounding electrode conductor. What is the minimum size of that common copper GEC?

Question 2: A painted metal enclosure is to be bonded. What must be done with the paint at the contact points?

Question 3: Which of these is NOT permitted to serve as an equipment grounding conductor?

Question 4: May an equipment grounding conductor also serve as a grounding electrode conductor?

Question 5: For an isolated ground receptacle, the insulated equipment grounding conductor may pass through a subpanel without connecting to its ground bar. Where may it terminate?

Question 6: Using the standard method, a 3,000 sq ft dwelling with two small-appliance circuits and one laundry circuit has what demand load for these three loads?

Question 7: A 24 kW, 3-phase resistance heater is supplied at 240 volts. What is the line current?

Question 8: A 2-wire branch circuit of 12 AWG copper runs 250 ft one way. Using 1.98 ohms per 1,000 ft, what is the total resistance of the two conductors?

Question 9: In a multifamily building, the branch circuit for the common-area hallway lighting may NOT be supplied from:

Question 10: The dwelling laundry receptacle outlet(s) must be supplied by at least one branch circuit rated:

Question 11: Ground-fault protection of equipment is required on a 2,000 A, 480Y/277-volt service disconnect. What is the maximum ground-fault trip setting?

Question 12: The required working space in front of a panelboard may be used for:

Question 13: Article 100 defines "utilization equipment" as equipment that:

Question 14: A plant load is 100 kW at a power factor of 0.80 lagging. How much reactive power does it draw?

Question 15: May XHHW (not XHHW-2) conductors be installed in a wet location?

Question 16: Type SE (service-entrance) cable is NOT permitted to be installed:

Question 17: A feeder uses 4/0 AWG aluminum conductors (75 °C terminations) supplying a panelboard. What is the largest standard breaker permitted to protect it?

Question 18: How are plug fuses rated 15 A or less identified?

Question 19: An adjustable-trip breaker has a maximum setting of 600 A but is set at 400 A. Its settings are behind a sealable cover accessible only to qualified persons. What rating may be used?

Question 20: A motor has an integral thermal protector. Its full-load current is 12 A. What is the maximum trip current permitted for the thermal protector?

Question 21: What is the minimum size copper branch-circuit conductor for a 15 hp, 460-volt, 3-phase motor (60 °C terminals)?

Question 22: Which receptacles installed for electric vehicle charging must have GFCI protection for personnel?

Question 23: What does 700.32 require of the overcurrent devices in an emergency system?

Question 24: A textile mill where easily ignitible fibers are handled or processed is classified as:

Question 25: At a marina, what is the minimum size of the insulated copper equipment grounding conductor for branch circuits?

Question 26: An outdoor receptacle in a wet location (where weather-resistant receptacles are required) is replaced. What type must the replacement be?

Question 27: An older cord-and-plug-connected vending machine has no built-in GFCI. How must it be protected?

Question 28: How many 3/0 AWG THHN copper conductors may be installed in 2 in. EMT? (40% area = 1.342 sq in.; one 3/0 THHN = 0.2679 sq in.)

Question 29: Boxes and conduit bodies must be installed so the wiring in them can be made accessible:

Question 30: Three 50 kVA single-phase transformers are connected delta-delta. One unit fails and is removed, leaving an open-delta bank. What is the maximum 3-phase load the remaining two units can supply?

Key NEC References for This Test

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