JOURNEYMAN NEC 2023 FULL-LENGTH PRO

Oregon Journeyman Electrician Practice Test - Full-Length Test 1

A full-length, 49-question practice exam covering all 8 core NEC topic areas, weighted the same way the real exam is. Modeled on Oregon's real licensing exam format. Premium — part of Full-Length Pro.

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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.

How to Use This Practice Test

This Oregon Journeyman Electrician Practice Test - Full-Length Test 1 has 49 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: This is an open-book exam — tab your NEC index and Articles 210, 250, and 430 before you start.

Topics covered: Branch circuits, grounding, wiring methods, load calculations, and motors.
Passing score: 70–75% (most states). Aim for 80% on practice tests so the real exam feels easy.
Questions: 49 multiple-choice, one correct answer each

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180 min

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Oregon Journeyman Electrician Practice Test - Full-Length Test 1 — Question List

Question 1: A 400 breaker protects a set of 450 kcmil feeder conductors. A feeder fed from 450 kcmil feeder that supply disconnects with 25 A over current device. What is the minimum size conductor for these tap?

8 AWG
6 AWG
4 AWG
16 AWG

NEC Reference: NEC 310.15(B)(16)

Question 2: The ampacity of branch circuit conductors between the controller and multi speed motor shall not be less than .............. percent of the current rating of the windings.

NEC Reference: NEC 430.21

Question 3: What size feeder conductor can be used for the following motors operating at 75⁰ C?

15 HP , 460 V Three phase motor

10 HP, 460 V Three phase motor

8 AWG
6 AWG
10 AWG
12 AWG

NEC Reference: NEC 430.250

Question 4: A 1 — " metal gas piping system in a building is required to be bonded per 250.104(B). The bonding conductor is sized using:

Table 250.66
Table 250.122 (rating of circuit likely to energize the piping)
Same size as the largest service conductor
Same size as the GEC

NEC Reference: NEC 250.104(B)

Question 5: A motor nameplate is stamped "Thermally Protected." What does this mean for external overload protection?

The motor still needs an external overload relay regardless
The motor has a built-in protector — no separate overload relay is required
Only GFCI protection is required instead of an overload relay
The thermal protection only covers short circuits, not overloads

NEC Reference: NEC 430.32(A)(2)(a)

Question 6: Determine the feeder demand for a 230 volts dwelling unit consists of Air-conditioning unit FLC (full load current) of 30 amperes and 3 heat circuit of — each 3KW ?

9000 watts
6900 volt-amperes
15900 volt-amperes

NEC Reference: NEC 220.82(C)

Question 7: The minimum thickness of the sealing compound of completed seal conduit, except where it is used in cables shall not be less than ............ mm

NEC Reference: NEC 501.15

Question 8: What is the maximum standard over current device rating used to protect instrument circuits located in a panel board?

15 amperes
30 amperes
200 amperes
150 amperes

NEC Reference: NEC 408.52

Question 9: Which of the following device is required to detect and protect against arcing in 15- and 20-amp branch circuits supplying outlets installed in dwelling units?

AFCI
GFCI
AFI
GFFC

NEC Reference: NEC 210.12(A)

Question 10: What is the calculated load on — branch circuit for 10 15 ampere receptacles in a retail store?

1800 volt-ampere
1600 volt-ampere
2400 volt-ampere
1400 volt-ampere

NEC Reference: NEC 220.14(I)

Question 11: Per 230.2, how many utility services (service drops or service laterals) are normally permitted for a single building or structure?

No limit — the owner decides how many services to install
One service, unless a listed exception applies
Two services — one for normal, one for emergency
Three services — one per phase of the electrical system

NEC Reference: NEC 230.2

Question 12: The maximum size of FMC that can be used is which of the following?

2 inches
4 inches
6 inches
1/2 inch

NEC Reference: NEC 348.20(b)

Question 13: What is the minimum cover depth that a direct buried PVC Cable must have?

18 inch
6 inch
12 inch
24 inch

NEC Reference: NEC 300.5

Question 14: Type AC cable (armored cable, BX) uses its metal armor as which part of the grounding system?

The armor is only for physical protection and does not ground anything
The armor serves as the equipment grounding conductor (EGC)
The armor bonds to the grounding electrode, replacing the GEC
The armor reduces electrical noise but does not ground the circuit

NEC Reference: NEC 330.108

Question 15: Normally over current devices are located in ungrounded conductors at a point where the conductors deliver the energy to the load.

True
False

NEC Reference: NEC 240.21

Question 16: for — single family dwelling unit what is the minimum allowable rating of a 3 wire service entrance conductor?

125 amperes
100 amperes
150 amperes
175 amperes

NEC Reference: NEC 230.42(B)

Question 17: The motor branch-circuit one-line shows the motor at 28A FLC. If a second motor of 14A FLC is added on the same feeder, minimum feeder conductor ampacity per 430.24 is:

NEC Reference: NEC 430.24

Question 18: A K-rated transformer is selected when the served load is:

A heavy non-linear (harmonic) load
Single-phase resistance heating only
A motor load of constant FLC
A power-factor-corrected load below 0.7 PF

NEC Reference: IEEE / NEC 450 / harmonics

Question 19: All 15,20 amperes receptacle outlets installed in bathrooms of dwelling units shall always require ...........................................

water proof receptacles
protective guards
Ground fault circuit interceptor
over current protection device

NEC Reference: NEC 210.8(A)(1)

Question 20: Same 45 kVA transformer (primary current = 93.75A), but now you use primary-only protection with no secondary OCPD. What is the maximum primary OCPD size?

100A
125A
150A
250A

NEC Reference: NEC 450.3(B)

Question 21: The minimum spacing between wood or other combustible materials and an incandescent lamp shall be ........ inches

1
1 1/2
2
2 1/2

NEC Reference: NEC 600.9

Question 22: The total maximum bend of a FMC — between two pull points is which of the following?

90 degrees
240 degrees
360 degrees
180 degrees

NEC Reference: NEC 348.26

Question 23: In the 200A residential panel shown, the 50A two-pole EV charger is a continuous load. Conductor and OCPD must be sized at:

100% of EVSE rating
125% of EVSE rating
150% of EVSE rating
80% of breaker rating

NEC Reference: NEC 625.41

Question 24: A long outdoor PVC conduit run is exposed to wide temperature swings between summer and winter. What installation fitting is required to prevent damage to the conduit?

Extra cemented couplings every 10 feet
Expansion fittings to handle the thermal movement
Flexible metal conduit sections at each end
No special fittings — PVC can handle temperature changes on its own

NEC Reference: NEC 352.44

Question 25: What is permissible voltage drop in percentage for feeders at the farthest outlet of power heating and lighting loads?

NEC Reference: NEC 215.2(A)(4)

Question 26: In a single phase electrical system the size of the largest ungrounded service entrance aluminum conductor is 1/0 AWG, which of the following is the size of the grounding conductor?

Aluminum No 6 AWG
Aluminum No 4 AWG
Copper No 2 AWG
Copper No 6 AWG

NEC Reference: NEC 250.66

Question 27: A commercial laundry has five electric dryers each rated at 5 kW. What demand factor from Table 220.54 applies to the group of five dryers?

100%
80%
65%
50%

NEC Reference: NEC Table 220.54

Question 28: What is the minimum size equipment grounding conductor (EGC) for a circuit protected by a 20A overcurrent device?

14 AWG copper
12 AWG copper
10 AWG copper
8 AWG copper

NEC Reference: NEC Table 250.122

Question 29: The allowable ampere rating of bus conductor is 48 amperes. What is the maximum allowable rating of over current device?

50 amperes
40 amperes
60 amperes
70 amperes

NEC Reference: NEC 240.4(B)

Question 30: You are picking a breaker for a 230V, single-phase motor with 20A full-load current. Using an inverse-time breaker and Table 430.52, what is the biggest breaker you can use?

NEC Reference: NEC Table 430.52

Question 31: What is the minimum volt ampere rating of a 180,000 square foot school?

540 KVA
320 KVA
720 KVA
480 KVA

NEC Reference: NEC 220.12

Question 32: What is the minimum distance that a service drop wires should maintain if it is placed above commercial places?

10 ft
12 ft
15 ft
18 ft

NEC Reference: NEC 230.24

Question 33: What should be electrical fuse size to protect 10 AWG conductor?

30 amperes
20 amperes
15 amperes
25 amperes

NEC Reference: NEC 240.4

Question 34: A feeder assembly shall not be required for — manufactured homes constructed with power supply cord attached with the distribution panel board.

True
False

NEC Reference: NEC 550.10

Question 35: If a single family unit consists of one air conditioner rated at 3 kW and fixed heating equipment rated at 2.5 kw? What is the total dwelling calculated load for both?

3 kW
2.5 kW
5.5 kW
1.5 kW

NEC Reference: NEC 220.60

Question 36: Which of the following is an allowable ampacity of an 10 AWG fixture wire?

23 amp
17 amp
28 amp
30 amp

NEC Reference: NEC 402.5

Question 37: The Minimum working clear distance in front of the enclosed equipment operating at a voltage 240 volts is ................ feet

NEC Reference: NEC 110.26

Question 38: The over current device — that feeds the marina shall have a ground fault protection not exceeding ......................

100 mA
150 mA
120 mA
80 mA

NEC Reference: NEC 555.3

Question 39: The nameplate rated load current of a hermitic motor compressor is 40 amperes, what is the rating of the over current protective device for a circuit supplying the motor?

46 amperes
40 amperes
50 amperes
48 amperes

NEC Reference: NEC 440.12(A)(1)

Question 40: The optional calculation method for a one-family dwelling (220.82) applies 100% demand to the first 10 kVA of the total load, and what percentage to everything above 10 kVA?

NEC Reference: NEC 220.82(B) — (C)

Question 41: What is the minimum working space that should be provided for switch boards and panel boards?

6 1/2 feet
8 1/2 feet
4 1/2 feet
2 1/2 feet

NEC Reference: NEC 110.26(A)(3)

Question 42: How many sets of 3 wire feeders shall be permitted to utilize a common neutral?

NEC Reference: NEC 215.4

Question 43: The branch circuit supplying the pump motor for a permanently installed swimming pool must include:

AFCI protection
GFCI protection
A dedicated 30A circuit with no other loads
A time clock with GFPE at the panel

NEC Reference: NEC 680.21(C)

Question 44: A 120/240 single family dwelling unit has a calculated demand load of 120 amperes, what is the minimum type of THW copper conductor size allowed?

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

NEC Reference: NEC 310.15(B)

Question 45: When 5 current carrying conductors grouped in a flexible card, what is conductor ampacity adjustment value?

90 %
80 %
70%
85%

NEC Reference: NEC 400.5(A)(3)

Question 46: The guard ring must be in contact to the earth and shall be buried at a depth from the earth's surface not less than ......................

3 feet
2 feet
1 1/2 feet
2 1/2 feet

NEC Reference: NEC 250.53(F)

Question 47: What is the minimum rated ampacity of each power supply circuit that supplies 30 volts lighting circuit?

30 Amperes
20 Amperes
25 Amperes
35 Amperes

NEC Reference: NEC 411.2

Question 48: The grounding electrode conductor connection to a grounding electrode must be made using what type of fitting or connector?

Any weatherproof wire connector is acceptable
A listed ground clamp or fitting listed for the type of electrode
The conductor must be soldered directly to the electrode
A standard plastic wire nut sealed with tape

NEC Reference: NEC 250.70

Question 49: What size THWN conductor is required for a 35A circuit?

8 AWG
6 AWG
10 AWG
12 AWG

NEC Reference: NEC 110.14

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.

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