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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 10

This is Journeyman Electrician Practice Test 10 — a free, exam-style practice test based on the 2023 NEC. The 30 questions follow the PSI journeyman exam outline: GEC taps and bonding jumpers, a full dwelling service calculation, fixed-appliance demand, SE cable support, plenum wiring, multiwire neutral continuity, fuse disconnects, PV backfeed (120% rule), dispenser emergency shutoffs and device box fill. You need 70% or higher to pass. Every question includes the NEC reference and a step-by-step explanation.

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Read each question carefully

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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

Motor overload device sizing with service factor 1.1 (NEC 430.32)
Minimum voltage at end of a circuit (5% VD rule)
Mixed series-parallel circuit resistance
Lamp resistance from power and voltage (R = V²/P)
Parallel circuit — voltage is the same across all branches
1000-ft conductor current from Ohm's Law
Power factor definition (True vs False)
Voltage drop across motor terminals
3-phase power factor calculation
Raceway definition (NEC 100)
Lighting outlet near HVAC equipment (NEC 210.70)
Hermetic compressor overcurrent protection (NEC 440.12)
Motor disconnect locked in open position (NEC 430.227)
Class II Division 1 rotating machinery (NEC 502.125)
Transformer accessibility (NEC 450.13)
Motor conductor sizing from NEC table (NEC 430.6)
Concrete-encased grounding electrode (NEC 250.52)
Appliance disconnect requirements (NEC 422.30)
Impedance in AC circuits
GFCI in outdoor commercial areas (NEC 210.8(B))

Tip: Keep a calculator handy. Several questions involve calculating overload ratings, resistance, and power factor.

Questions

75 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

Student Reviews 4.0 / 5 · 1 review

Sasha P.

The calculation questions are where I needed the most help and this site covers them well. I still got a few wrong on the real exam but way fewer than I would have without practicing here. Solid resource, would recomend.

Journeyman Electrician Practice Test 10 — Question List

Question 1: A bonding jumper connects a ground rod to the metal water pipe electrode. How is this jumper sized?

From Table 250.122, by the main breaker rating
Always 10 AWG copper, regardless of service
Always the same size as the service neutral
From Table 250.66; 6 AWG Cu max to the rod

NEC Reference: NEC 250.53(C)

Question 2: A detached shed is supplied by a single 20-ampere, 120-volt branch circuit with an EGC. Is a grounding electrode required at the shed?

Yes, unless the branch circuit is GFCI protected
No, but the neutral must be bonded to the shed panel
Yes, every separate building always needs one
No; a single branch circuit (even multiwire) is exempt

NEC Reference: NEC 250.32(A)

Question 3: A service has six disconnects in separate enclosures, and a common GEC with taps is used. How is each GEC tap sized?

Table 250.66, by the largest conductor in that enclosure
Table 250.122, by the rating of each disconnect
All taps are the same size as the common GEC
Every tap is exactly 8 AWG copper, no larger

NEC Reference: NEC 250.64(D)(1)

Question 4: An equipment bonding jumper is installed on the outside of a flexible raceway. What limits apply?

No more than 6 ft long and routed with the raceway
No more than 10 ft long, routed anywhere
No limit, if the jumper is green insulated
Not permitted; jumpers must be inside raceways

NEC Reference: NEC 250.102(E)(2)

Question 5: Where may the grounding electrode conductor be connected to the grounded service conductor?

Only at the first subpanel after the service
At any panelboard inside the building
Only at the serving utility transformer
Service drop or lateral end, up to the disconnect neutral bus

NEC Reference: NEC 250.24(A)(1)

Question 6: A 1,500 sq ft dwelling has the two required small-appliance circuits, one laundry circuit, a 12 kW range and a 5 kW dryer. Using the standard method, what is the service load in amperes at 240 V (no other loads)?

63.1 A
75.4 A
89.6 A
104.2 A

NEC Reference: NEC 220.41, 220.52, Table 220.45, 220.54 and Table 220.55

Question 7: A dwelling has four fastened-in-place appliances: a 4,500 VA water heater, a 1,200 VA dishwasher, a 900 VA disposal and an 800 VA trash compactor. What is the demand load for these appliances?

5,550 VA
6,660 VA
7,400 VA
9,250 VA

NEC Reference: NEC 220.53

Question 8: What is the resistance of a 4,800-watt, 240-volt water heater element?

50 Ω
20 Ω
12 Ω
6 Ω

Question 9: Service-entrance cable run on the outside of a building must be supported within 12 in. of the service head and at intervals not exceeding:

24 in.
30 in.
4½ ft
6 ft

NEC Reference: NEC 230.51(A)

Question 10: A dwelling foyer that is not part of a hallway has an area of 80 sq ft. What is required?

None; receptacles are not required in foyers
A receptacle every 12 ft around the room
One receptacle beside the entry door only
A receptacle in each wall space 3 ft or wider

NEC Reference: NEC 210.52(I)

Question 11: In a one-family dwelling with an attached garage, what branch circuit must supply the garage receptacle outlets?

At least one 120 V, 20 A circuit, no other outlets
A dedicated 240 V, 30 A branch circuit
The kitchen small-appliance branch circuit
Any 15 A general-purpose branch circuit

NEC Reference: NEC 210.11(C)(4)

Question 12: Article 100 defines "overload" as:

Any ground fault, regardless of the current level
Operation above full-load rating that causes damage if it persists
The voltage drop caused by a very long circuit run
A short circuit between two phase conductors

NEC Reference: NEC Article 100

Question 13: A panelboard has a short-circuit current rating of 10,000 A. The available fault current at its line terminals is 18,000 A. What does 110.10 require?

A ground-fault protection relay ahead of the panelboard
A main breaker sized 10% larger than the panelboard rating
Nothing; only the breakers need an interrupting rating
Equipment with an SCCR at least equal to available fault current

NEC Reference: NEC 110.10

Question 14: A 6-pole, 60 Hz induction motor runs at 1,140 rpm at full load. What is its slip?

Question 15: A conduit holds fifteen current-carrying 8 AWG THHN copper conductors (ambient 30 °C). After the bundling adjustment of Table 310.15(C)(1), each conductor may carry:

22.0 A
27.5 A
38.5 A
44.0 A

NEC Reference: NEC 310.15(C)(1)

Question 16: Which wiring method is NOT permitted in the space above a suspended ceiling that is used for environmental air (a plenum)?

Type MC cable without a nonmetallic outer covering
Rigid metal conduit
Type NM cable
EMT

NEC Reference: NEC 300.22(C)(1)

Question 17: On a multiwire branch circuit, how must the grounded (neutral) conductor be connected at a receptacle?

Neutrals spliced with a pigtail to the device
Left unconnected when the loads are balanced
Connected to the metal box with a green screw
Through the two neutral screws on the receptacle

NEC Reference: NEC 300.13(B)

Question 18: Cartridge fuses accessible to unqualified persons, and all fuses in circuits over 150 V to ground, must have:

A disconnecting means on the supply side
Time-delay ratings of at least 175%
A GFCI device installed ahead of them
A spare fuse stored inside the enclosure

NEC Reference: NEC 240.40

Question 19: A feeder is protected by a 1,200-ampere breaker. What is required of the feeder conductors?

Ampacity of at least 80% of the rating
Ampacity at least equal to the 1,200 A rating
Any ampacity, if the load is under 1,000 A
Ampacity of at least 1,000 A (next size down)

NEC Reference: NEC 240.4(C)

Question 20: For a portable motor rated 1/3 hp or less, what may serve as the controller?

Nothing; every motor needs a magnetic starter
Only a horsepower-rated toggle switch
Only the branch-circuit breaker in the panel
The attachment plug and the receptacle

NEC Reference: NEC 430.81(B)

Question 21: A motor controller generally must have a horsepower rating that is:

Equal to the motor full-load current rating
At least twice the motor horsepower rating
Not lower than the motor horsepower rating
Not required on any motor controller

NEC Reference: NEC 430.83(A)(1)

Question 22: A wet-niche underwater pool luminaire is mounted in the pool wall. Unless listed for less depth, the top of the lens must be at least how far below the normal water level?

4 in.
12 in.
18 in.
24 in.

NEC Reference: NEC 680.23(A)(5)

Question 23: A 200 A panelboard busbar is protected by a 200 A main breaker. The PV inverter breaker is installed at the opposite end of the busbar from the main. Under the 120% rule, what is the maximum value of 125% of the inverter output current?

20 A
40 A
50 A
60 A

NEC Reference: NEC 705.12(B)(3)(2)

Question 24: At a self-service motor fuel dispensing facility, the emergency electrical disconnects that shut off power to the dispensers must be located:

More than 100 ft from every dispenser
At the main service, wherever it is located
From 20 ft to 100 ft from the dispensers
Within 10 ft of each dispenser island

NEC Reference: NEC 514.11

Question 25: The service equipment for a mobile home must be rated at not less than:

50 A
60 A
100 A
200 A

NEC Reference: NEC 550.32(C)

Question 26: A single non-motor-operated appliance is rated 16 A. What is the maximum branch-circuit overcurrent device rating if none is marked on the appliance?

20 A
25 A
30 A
40 A

NEC Reference: NEC 422.11(E)(3)

Question 27: May a receptacle be installed face-up in a kitchen countertop?

Yes, if it is a 20 A receptacle
Yes, provided it is GFCI protected
Yes; any duplex receptacle may be used
Only if listed for countertop use

NEC Reference: NEC 406.5(E)

Question 28: A 3 in. × 2 in. × 3½ in. device box (18.0 cu in.) contains one switch and two equipment grounding conductors, all 14 AWG, and no internal clamps. How many 14 AWG circuit conductors may be added?

NEC Reference: NEC 314.16(A) and (B)

Question 29: May cables in the cavity above a fire-rated suspended ceiling be supported by the ceiling support wires?

Only Class 2 cables may use the ceiling wires
No; independent, identifiable supports are needed
Yes; any ceiling support wire may be used
Yes, if the cables are tie-wrapped every 3 ft

NEC Reference: NEC 300.11(B)

Question 30: What does 450.9 require for transformer ventilation?

Openings must not be blocked by walls or obstructions
Installation only in rooms with operable windows
At least 36 in. of clearance on all four sides
A dedicated exhaust fan is needed for every unit

NEC Reference: NEC 450.9

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 10

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Key NEC References for This Test

Journeyman Electrician Practice Test 10

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Before You Start

What This Test Covers

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Journeyman Electrician Practice Test 10 — Question List

Question 1: A bonding jumper connects a ground rod to the metal water pipe electrode. How is this jumper sized?

Question 2: A detached shed is supplied by a single 20-ampere, 120-volt branch circuit with an EGC. Is a grounding electrode required at the shed?

Question 3: A service has six disconnects in separate enclosures, and a common GEC with taps is used. How is each GEC tap sized?

Question 4: An equipment bonding jumper is installed on the outside of a flexible raceway. What limits apply?

Question 5: Where may the grounding electrode conductor be connected to the grounded service conductor?

Question 6: A 1,500 sq ft dwelling has the two required small-appliance circuits, one laundry circuit, a 12 kW range and a 5 kW dryer. Using the standard method, what is the service load in amperes at 240 V (no other loads)?

Question 7: A dwelling has four fastened-in-place appliances: a 4,500 VA water heater, a 1,200 VA dishwasher, a 900 VA disposal and an 800 VA trash compactor. What is the demand load for these appliances?

Question 8: What is the resistance of a 4,800-watt, 240-volt water heater element?

Question 9: Service-entrance cable run on the outside of a building must be supported within 12 in. of the service head and at intervals not exceeding:

Question 10: A dwelling foyer that is not part of a hallway has an area of 80 sq ft. What is required?

Question 11: In a one-family dwelling with an attached garage, what branch circuit must supply the garage receptacle outlets?

Question 12: Article 100 defines "overload" as:

Question 13: A panelboard has a short-circuit current rating of 10,000 A. The available fault current at its line terminals is 18,000 A. What does 110.10 require?

Question 14: A 6-pole, 60 Hz induction motor runs at 1,140 rpm at full load. What is its slip?

Question 15: A conduit holds fifteen current-carrying 8 AWG THHN copper conductors (ambient 30 °C). After the bundling adjustment of Table 310.15(C)(1), each conductor may carry:

Question 16: Which wiring method is NOT permitted in the space above a suspended ceiling that is used for environmental air (a plenum)?

Question 17: On a multiwire branch circuit, how must the grounded (neutral) conductor be connected at a receptacle?

Question 18: Cartridge fuses accessible to unqualified persons, and all fuses in circuits over 150 V to ground, must have:

Question 19: A feeder is protected by a 1,200-ampere breaker. What is required of the feeder conductors?

Question 20: For a portable motor rated 1/3 hp or less, what may serve as the controller?

Question 21: A motor controller generally must have a horsepower rating that is:

Question 22: A wet-niche underwater pool luminaire is mounted in the pool wall. Unless listed for less depth, the top of the lens must be at least how far below the normal water level?

Question 23: A 200 A panelboard busbar is protected by a 200 A main breaker. The PV inverter breaker is installed at the opposite end of the busbar from the main. Under the 120% rule, what is the maximum value of 125% of the inverter output current?

Question 24: At a self-service motor fuel dispensing facility, the emergency electrical disconnects that shut off power to the dispensers must be located:

Question 25: The service equipment for a mobile home must be rated at not less than:

Question 26: A single non-motor-operated appliance is rated 16 A. What is the maximum branch-circuit overcurrent device rating if none is marked on the appliance?

Question 27: May a receptacle be installed face-up in a kitchen countertop?

Question 28: A 3 in. × 2 in. × 3½ in. device box (18.0 cu in.) contains one switch and two equipment grounding conductors, all 14 AWG, and no internal clamps. How many 14 AWG circuit conductors may be added?

Question 29: May cables in the cavity above a fire-rated suspended ceiling be supported by the ceiling support wires?

Question 30: What does 450.9 require for transformer ventilation?

Key NEC References for This Test

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