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Oregon Journeyman Electrician Practice Test - Full-Length Test 1

A full-length, 52-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.

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180 min

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TOPICS COVERED

Wiring and Protection Motor Circuits Load Calculations Special Occupancies Equipment for General Use Wiring Methods and Materials Special Equipment General Requirements

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52 questions in 180 minutes, sized and paced like the Oregon journeyman exam.

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How to Use This Practice Test

This Oregon Journeyman Electrician Practice Test - Full-Length Test 1 has 52 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: 52 multiple-choice, one correct answer each

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

Question 1: A 400 A breaker protects 450 kcmil copper feeder conductors. A 10-foot tap from this feeder supplies a disconnect with a 25 A overcurrent device. What is the minimum size copper tap conductor?

8 AWG
6 AWG
4 AWG
10 AWG

NEC Reference: NEC 240.21(B)(1), Table 310.16

Question 2: Branch-circuit conductors between the controller and a multispeed motor must have an ampacity of not less than what percent of the highest winding full-load current?

NEC Reference: NEC 430.22(B)

Question 3: What size copper feeder conductor (75°C terminals) is needed for a 15 HP and a 10 HP motor, both 460 V, 3-phase?

8 AWG
6 AWG
10 AWG
12 AWG

NEC Reference: NEC 430.250

Question 4: A 1½-inch metal gas piping system in a building must 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: A 230-volt dwelling unit has an air-conditioning unit with a full-load current of 30 amperes and three 3 kW heating circuits. What load is used for the feeder demand?

9,000 watts
6,900 volt-amperes
15,900 volt-amperes
12,000 volt-amperes

NEC Reference: NEC 220.60

Question 7: The thickness of the sealing compound in a completed conduit seal must not be less than the trade size of the fitting, and in no case less than ____ mm.

NEC Reference: NEC 501.15

Question 8: What is the maximum overcurrent device rating used to protect instrument circuits on a switchboard?

15 amperes
30 amperes
200 amperes
150 amperes

NEC Reference: NEC 408.52

Question 9: Which device is required to protect against arc faults on 120-V, 15- and 20-ampere branch circuits supplying outlets in dwelling unit bedrooms and living areas?

AFCI
GFCI
SPD
GFPE

NEC Reference: NEC 210.12(B)

Question 10: What is the calculated load on a branch circuit for ten 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: What is the largest trade size of FMC permitted?

2 inches
4 inches
6 inches
1/2 inch

NEC Reference: NEC 348.20(b)

Question 13: What is the minimum cover for direct-buried PVC conduit in a general location?

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 320.108, 250.118

Question 15: Overcurrent devices are normally located at the point where conductors deliver energy to the load.

True
False

NEC Reference: NEC 240.21

Question 16: For a single-family dwelling unit, what is the minimum allowable rating of 3-wire service-entrance conductors?

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 C57.110 / UL 1561 (K-factor rating; not an NEC rule)

Question 19: All 125-volt, 15- and 20-ampere receptacles installed in dwelling unit bathrooms require:

Weatherproof receptacles
Protective guards
GFCI protection
An overcurrent device in the box

NEC Reference: NEC 210.8(A)(1)

Question 20: A 45 kVA single-phase transformer has a rated primary current of 93.75 A and primary-only protection (no secondary overcurrent device). What is the maximum primary overcurrent device size?

100A
125A
150A
250A

NEC Reference: NEC 450.3(B)

Question 21: In an electric sign, the minimum spacing between wood or other combustible material and an incandescent or halogen lamp or lampholder is ____ inches.

1
1 1/2
2
2 1/2

NEC Reference: NEC 600.9

Question 22: What is the maximum total of bends in a run of FMC between pull points?

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 the recommended maximum voltage drop for a feeder to the farthest outlet of power, heating and lighting loads?

NEC Reference: NEC 215.2(A) Informational Note

Question 26: In a single-phase system, the largest ungrounded aluminum service-entrance conductor is 1/0 AWG. What is the minimum size grounding electrode 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 multifamily building has five household electric dryers, each rated 5 kW. What demand factor from Table 220.54 applies?

100%
85%
75%
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: A busway or conductor has an allowable ampacity of 48 amperes. What is the maximum overcurrent device rating that may protect it?

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 general lighting load of a 180,000 sq ft school?

270 kVA
320 kVA
540 kVA
480 kVA

NEC Reference: NEC Table 220.42(A)

Question 32: What is the minimum clearance of service-drop conductors (300 volts or less to ground) over commercial areas not subject to truck traffic?

10 ft
12 ft
15 ft
18 ft

NEC Reference: NEC 230.24(B)(2)

Question 33: What is the maximum fuse size to protect a 10 AWG copper conductor?

30 amperes
20 amperes
15 amperes
25 amperes

NEC Reference: NEC 240.4(D)(7)

Question 34: A feeder assembly is not required for a manufactured home built with a power-supply cord attached to the distribution panelboard.

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: What is the minimum working space depth in front of enclosed equipment operating at 240 volts (120 volts to ground), Condition 1?

NEC Reference: NEC Table 110.26(A)(1)

Question 38: Feeder and branch-circuit conductors on marina docking facilities must have ground-fault protection not exceeding:

100 mA
150 mA
120 mA
80 mA

NEC Reference: NEC 555.35

Question 39: The nameplate rated-load current of a hermetic motor-compressor is 40 A. What is the minimum ampere rating of its disconnecting means?

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 headroom required in the working space for switchboards and panelboards?

6½ feet
8½ feet
4½ feet
2½ feet

NEC Reference: NEC 110.26(A)(3)

Question 42: Up to how many sets of 3-wire feeders may use 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: When 5 current-carrying conductors are grouped in a flexible cord, what is the ampacity adjustment factor?

90 %
80 %
70%
85%

NEC Reference: NEC 400.5(A)(3)

Question 45: A ground ring electrode must be buried at a depth of not less than:

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

NEC Reference: NEC 250.53(F)

Question 46: The output of a power supply for an Article 411 lighting system operating at 30 volts or less must not exceed:

30 Amperes
20 Amperes
25 Amperes
35 Amperes

NEC Reference: NEC 411.4

Question 47: 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 48: What size copper THWN conductor is required for a 35 A circuit with 60°C terminations?

8 AWG
6 AWG
10 AWG
12 AWG

NEC Reference: NEC 110.14

Question 49: A Florida dwelling has five fastened-in-place appliances (excluding range, dryer, and HVAC) totaling 12,000 VA of nameplate load. Per 220.53, what demand load applies?

6,000 VA
9,000 VA
10,800 VA
12,000 VA

NEC Reference: NEC 220.53

Question 50: Rigid nonmetallic conduit (PVC) is direct-buried under a Michigan yard, not under a building or driveway. What minimum cover does Table 300.5 require?

12 inches
18 inches
24 inches
30 inches

NEC Reference: NEC Table 300.5

Question 51: A dwelling has a family room. Per 210.12(B), does this room require AFCI protection?

Yes, family rooms are included in the list of areas requiring AFCI protection
No, family rooms are always exempt from AFCI
AFCI protection has never applied to family rooms
AFCI is only required if the room exceeds 400 square feet

NEC Reference: NEC 210.12(B)

Question 52: Inside a panelboard, does each ungrounded conductor need its own individually mounted overcurrent device?

Yes, each ungrounded conductor needs its own individual overcurrent device
No, several circuits can always share a single breaker
Only the neutral requires individual protection
It depends only on the panel manufacturer

NEC Reference: NEC Art. 408

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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Oregon Journeyman Electrician Practice Test - Full-Length Test 1

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

Question 1: A 400 A breaker protects 450 kcmil copper feeder conductors. A 10-foot tap from this feeder supplies a disconnect with a 25 A overcurrent device. What is the minimum size copper tap conductor?

Question 2: Branch-circuit conductors between the controller and a multispeed motor must have an ampacity of not less than what percent of the highest winding full-load current?

Question 3: What size copper feeder conductor (75°C terminals) is needed for a 15 HP and a 10 HP motor, both 460 V, 3-phase?

Question 4: A 1½-inch metal gas piping system in a building must be bonded per 250.104(B). The bonding conductor is sized using:

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

Question 6: A 230-volt dwelling unit has an air-conditioning unit with a full-load current of 30 amperes and three 3 kW heating circuits. What load is used for the feeder demand?

Question 7: The thickness of the sealing compound in a completed conduit seal must not be less than the trade size of the fitting, and in no case less than ____ mm.

Question 8: What is the maximum overcurrent device rating used to protect instrument circuits on a switchboard?

Question 9: Which device is required to protect against arc faults on 120-V, 15- and 20-ampere branch circuits supplying outlets in dwelling unit bedrooms and living areas?

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

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

Question 12: What is the largest trade size of FMC permitted?

Question 13: What is the minimum cover for direct-buried PVC conduit in a general location?

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

Question 15: Overcurrent devices are normally located at the point where conductors deliver energy to the load.

Question 16: For a single-family dwelling unit, what is the minimum allowable rating of 3-wire service-entrance conductors?

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:

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

Question 19: All 125-volt, 15- and 20-ampere receptacles installed in dwelling unit bathrooms require:

Question 20: A 45 kVA single-phase transformer has a rated primary current of 93.75 A and primary-only protection (no secondary overcurrent device). What is the maximum primary overcurrent device size?

Question 21: In an electric sign, the minimum spacing between wood or other combustible material and an incandescent or halogen lamp or lampholder is ____ inches.

Question 22: What is the maximum total of bends in a run of FMC between pull points?

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:

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?

Question 25: What is the recommended maximum voltage drop for a feeder to the farthest outlet of power, heating and lighting loads?

Question 26: In a single-phase system, the largest ungrounded aluminum service-entrance conductor is 1/0 AWG. What is the minimum size grounding electrode conductor?

Question 27: A multifamily building has five household electric dryers, each rated 5 kW. What demand factor from Table 220.54 applies?

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

Question 29: A busway or conductor has an allowable ampacity of 48 amperes. What is the maximum overcurrent device rating that may protect it?

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?

Question 31: What is the minimum general lighting load of a 180,000 sq ft school?

Question 32: What is the minimum clearance of service-drop conductors (300 volts or less to ground) over commercial areas not subject to truck traffic?

Question 33: What is the maximum fuse size to protect a 10 AWG copper conductor?

Question 34: A feeder assembly is not required for a manufactured home built with a power-supply cord attached to the distribution panelboard.

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?

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

Question 37: What is the minimum working space depth in front of enclosed equipment operating at 240 volts (120 volts to ground), Condition 1?

Question 38: Feeder and branch-circuit conductors on marina docking facilities must have ground-fault protection not exceeding:

Question 39: The nameplate rated-load current of a hermetic motor-compressor is 40 A. What is the minimum ampere rating of its disconnecting means?

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?

Question 41: What is the minimum headroom required in the working space for switchboards and panelboards?

Question 42: Up to how many sets of 3-wire feeders may use a common neutral?

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

Question 44: When 5 current-carrying conductors are grouped in a flexible cord, what is the ampacity adjustment factor?

Question 45: A ground ring electrode must be buried at a depth of not less than:

Question 46: The output of a power supply for an Article 411 lighting system operating at 30 volts or less must not exceed:

Question 47: The grounding electrode conductor connection to a grounding electrode must be made using what type of fitting or connector?

Question 48: What size copper THWN conductor is required for a 35 A circuit with 60°C terminations?

Question 49: A Florida dwelling has five fastened-in-place appliances (excluding range, dryer, and HVAC) totaling 12,000 VA of nameplate load. Per 220.53, what demand load applies?

Question 50: Rigid nonmetallic conduit (PVC) is direct-buried under a Michigan yard, not under a building or driveway. What minimum cover does Table 300.5 require?

Question 51: A dwelling has a family room. Per 210.12(B), does this room require AFCI protection?

Question 52: Inside a panelboard, does each ungrounded conductor need its own individually mounted overcurrent device?

Key NEC References for This Test

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