Previous Journeyman Electrician Practice Test 39

JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 40

Free Online Journeyman Electrician Exam Practice Test — 40This free 30-question practice test covers journeyman exam topics based on the 2023 NEC, including minimum service size for dwellings (NEC 230.79), receptacle load demand factors (NEC 220.44), feeder voltage drop (NEC 215.2), emergency storage battery voltage (NEC 700.12), low-voltage lighting systems (NEC 411), branch circuit calculations, grounding-type receptacles (NEC 406.4), ITC cable limits (NEC 727.4), service drop clearances (NEC 230.24), and energy cost calculations.

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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.

Key rules: One-family dwelling minimum service = 100A 3-wire (NEC 230.79(C)). Non-dwelling receptacle demand: first 10 kVA at 100%, remainder at 50% (NEC Table 220.44). Feeder voltage drop recommendation ≤3% (NEC 215.2(A)(1) Informational Note). Emergency battery must maintain ≥87.5% of system voltage (NEC 700.12(A)). Low-voltage lighting = ≤30V (NEC 411.1). ITC cable ≤5A at 150V (NEC 727.4). Service drops over 300V require 15 ft minimum clearance (NEC 230.24(B)(3)).

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Journeyman Electrician Practice Test 40 — Question List

Question 1: A residence has six 2-wire branch circuits what is the minimum size service is required for this residence?

100 ampere for a 3 wire service
140 ampere for a 2 wire service
50 ampere for a 3 wire service
80 ampere for a 2 wire service

NEC Reference: NEC 230.79(C)

Question 2: What is the demand factor in percentage for a non-dwelling unit with a receptacle load of 15 kVA?

NEC Reference: NEC 220.44

Question 3: 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)(1)

Question 4: What is the minimum percentage rated voltage that a storage battery should supply the emergency load?

80 %
85 %
82 1/2 %
87 1/2 %

NEC Reference: NEC 700.12(A)

Question 5: What is the maximum operating voltage of a low voltage lighting system?

30 volts
25 volts
40 volts
35 volts

NEC Reference: NEC 411.1

Question 6: How many number of branch circuits required for a 1600 square foot house?

Two 20-amperes branch circuits
one 30-ampere branch circuits
two 15 ampere branch circuits
three 20 ampere branch circuits

NEC Reference: NEC 210.11(A)

Question 7: Receptacles installed on 20 ampere branch circuit shall be grounding type.

True
False

NEC Reference: NEC 406.4(B)

Question 8: Type ITC (Instrumentation Tray Cable) shall not be used in circuits operating at more than __________ amperes at 150 volts.

10 amperes
5 amperes
15 amperes
20 amperes

NEC Reference: NEC 727.4

Question 9: What is the minimum clearance of service drops of 600 volts over residential property?

10 feet
15 feet
8 feet
12 feet

NEC Reference: NEC 230.24(B)(3)

Question 10: What is the operating cost of 1 watt electric clock for two years at 2 cents per kwh?

30 cents
70 cents
35 cents
55 cents

Question 11: Per NEC 240.4(D), the maximum overcurrent protective device (OCPD) rating for No. 12 AWG copper branch circuit conductors is _____ amperes.

15 amperes
20 amperes
25 amperes
30 amperes

NEC Reference: NEC 240.4(D)

Question 12: Per NEC 300.4(A)(1), where NM cable passes through bored holes in wood framing members and the edge of the hole is less than _____ from the nearest edge of the wood member, a steel plate shall be installed to protect the cable.

3/4 inch
1 inch
1¼ inches
1½ inches

NEC Reference: NEC 300.4(A)(1)

Question 13: Per NEC 225.30, where more than one building or structure is on the same property under single management, each separate building shall normally be supplied by _____ feeder or branch circuit.

Two — one for power and one for lighting
One
As many as needed without restriction
Three — one per phase of a 3-phase system

NEC Reference: NEC 225.30

Question 14: Per NEC Table 430.52, the maximum rating of an inverse time circuit breaker used as the branch-circuit short-circuit and ground-fault protective device for a single-phase motor shall not exceed _____ percent of the motor's full-load current (FLC).

125%
175%
250%
300%

NEC Reference: NEC Table 430.52

Question 15: Per NEC 110.14(C)(1), for equipment rated 100 amperes or less with conductors No. 14 AWG through No. 1 AWG, the temperature rating used for conductor ampacity at terminal connections shall be _____ unless the equipment is listed and marked for a higher temperature.

45°C
60°C
75°C
90°C

NEC Reference: NEC 110.14(C)(1)

Question 16: When a feeder is run from a main building to a separate structure (such as a detached garage), per NEC 250.32(B)(1), the disconnecting means in the separate structure shall _____ .

Bond the neutral bar to the panel enclosure (same as the main panel)
Keep the neutral isolated from the panel enclosure — no neutral-to-ground bond
Connect the neutral directly to a local ground rod only
Use a 2-wire feeder with no EGC to the separate structure

NEC Reference: NEC 250.32(B)(1)

Question 17: Per NEC 250.122(F)(1), when circuit conductors are run in parallel through separate raceways, the equipment grounding conductor (EGC) shall be _____ .

Combined into a single large EGC in one of the raceways
Run in parallel — one EGC installed in each raceway
Omitted — parallel conductors do not require an EGC
Run as a single EGC outside all the raceways

NEC Reference: NEC 250.122(F)(1)

Question 18: Per NEC Table 314.16(B), the volume allowance for each No. 12 AWG conductor entering or originating in an outlet box is _____ cubic inches.

2.00 cubic inches
2.25 cubic inches
2.50 cubic inches
3.00 cubic inches

NEC Reference: NEC Table 314.16(B)

Question 19: Per NEC 220.14(F), each sign or outline lighting outlet (required by NEC 600.5) shall be calculated at a minimum load of _____ volt-amperes for load calculation purposes.

600 volt-amperes
1,000 volt-amperes
1,200 volt-amperes
1,500 volt-amperes

NEC Reference: NEC 220.14(F)

Question 20: Per NEC 230.23(A), individual overhead service-drop conductors shall not be smaller than _____ for copper conductors.

No. 12 AWG
No. 10 AWG
No. 8 AWG
No. 6 AWG

NEC Reference: NEC 230.23(A)

Question 21: Per NEC 250.104(B), the bonding jumper used to bond exposed metal gas piping shall be not smaller than _____ AWG copper.

No. 14 AWG
No. 12 AWG
No. 10 AWG
No. 8 AWG

NEC Reference: NEC 250.104(B)

Question 22: Per NEC 110.12, electrical equipment shall be installed in a _____ manner.

Temporary
Neat and workmanlike
Minimum cost
Self-supporting without fasteners

NEC Reference: NEC 110.12

Question 23: Per NEC 210.52(C)(2), at least one receptacle outlet shall be installed for a kitchen island countertop that has a long dimension of _____ inches or greater and a short dimension of 12 inches or greater.

12 inches
18 inches
24 inches
36 inches

NEC Reference: NEC 210.52(C)(2)

Question 24: Per NEC 250.30(A)(3), the grounding electrode conductor (GEC) for a separately derived system (such as a transformer secondary) shall be connected at the _____ .

The first downstream distribution panel
The same point as the system bonding jumper at the transformer secondary
The nearest water pipe electrode only
The main service panel of the building

NEC Reference: NEC 250.30(A)(3)

Question 25: Per NEC Table 310.15(C)(3), when conduit containing conductors is installed on a rooftop within ½ inch (13 mm) of the roof surface and exposed to direct sunlight, an additional _____ °C shall be added to the ambient temperature when calculating temperature correction factors.

14°C
22°C
33°C
44°C

NEC Reference: NEC Table 310.15(C)(3)

Question 26: Per NEC 314.27(A)(1), a standard outlet box used as the sole support for a luminaire (light fixture) shall be capable of supporting a luminaire weighing not more than _____ pounds.

25 pounds
35 pounds
50 pounds
75 pounds

NEC Reference: NEC 314.27(A)(1)

Question 27: Per NEC 330.10, Type MC (metal-clad) cable is permitted to be installed in which of the following locations that Type NM cable is NOT permitted?

Dry interior walls only
Wet locations (where listed for wet use)
Class I Division 1 hazardous locations without special fittings
Embedded directly in concrete slabs

NEC Reference: NEC 330.10

Question 28: Per NEC 480.9(A), rooms or enclosures containing vented storage batteries shall be provided with adequate _____ to prevent the accumulation of an explosive mixture of gases.

Lighting
Ventilation
Heating
Fire suppression

NEC Reference: NEC 480.9(A)

Question 29: Per NEC 210.3, the recognized standard ampere ratings for multi-outlet branch circuits (other than individual branch circuits) are _____ .

15, 20, 25, 30, and 40 amperes
15, 20, 30, 40, and 50 amperes
15, 20, 30, 45, and 60 amperes
Any rating that matches the load

NEC Reference: NEC 210.3

Question 30: Per NEC 210.20(A), the rating of a branch circuit overcurrent protective device (OCPD) shall not be less than _____ percent of the continuous load plus 100 percent of the noncontinuous load.

100%
115%
125%
150%

NEC Reference: NEC 210.20(A)

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 40

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Key NEC References for This Test

Journeyman Electrician Practice Test 40

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Journeyman Electrician Practice Test 40 — Question List

Question 1: A residence has six 2-wire branch circuits what is the minimum size service is required for this residence?

Question 2: What is the demand factor in percentage for a non-dwelling unit with a receptacle load of 15 kVA?

Question 3: What is permissible voltage drop in percentage for feeders at the farthest outlet of power heating and lighting loads?

Question 4: What is the minimum percentage rated voltage that a storage battery should supply the emergency load?

Question 5: What is the maximum operating voltage of a low voltage lighting system?

Question 6: How many number of branch circuits required for a 1600 square foot house?

Question 7: Receptacles installed on 20 ampere branch circuit shall be grounding type.

Question 8: Type ITC (Instrumentation Tray Cable) shall not be used in circuits operating at more than __________ amperes at 150 volts.

Question 9: What is the minimum clearance of service drops of 600 volts over residential property?

Question 10: What is the operating cost of 1 watt electric clock for two years at 2 cents per kwh?

Question 11: Per NEC 240.4(D), the maximum overcurrent protective device (OCPD) rating for No. 12 AWG copper branch circuit conductors is _____ amperes.

Question 12: Per NEC 300.4(A)(1), where NM cable passes through bored holes in wood framing members and the edge of the hole is less than _____ from the nearest edge of the wood member, a steel plate shall be installed to protect the cable.

Question 13: Per NEC 225.30, where more than one building or structure is on the same property under single management, each separate building shall normally be supplied by _____ feeder or branch circuit.

Question 14: Per NEC Table 430.52, the maximum rating of an inverse time circuit breaker used as the branch-circuit short-circuit and ground-fault protective device for a single-phase motor shall not exceed _____ percent of the motor's full-load current (FLC).

Question 15: Per NEC 110.14(C)(1), for equipment rated 100 amperes or less with conductors No. 14 AWG through No. 1 AWG, the temperature rating used for conductor ampacity at terminal connections shall be _____ unless the equipment is listed and marked for a higher temperature.

Question 16: When a feeder is run from a main building to a separate structure (such as a detached garage), per NEC 250.32(B)(1), the disconnecting means in the separate structure shall _____ .

Question 17: Per NEC 250.122(F)(1), when circuit conductors are run in parallel through separate raceways, the equipment grounding conductor (EGC) shall be _____ .

Question 18: Per NEC Table 314.16(B), the volume allowance for each No. 12 AWG conductor entering or originating in an outlet box is _____ cubic inches.

Question 19: Per NEC 220.14(F), each sign or outline lighting outlet (required by NEC 600.5) shall be calculated at a minimum load of _____ volt-amperes for load calculation purposes.

Question 20: Per NEC 230.23(A), individual overhead service-drop conductors shall not be smaller than _____ for copper conductors.

Question 21: Per NEC 250.104(B), the bonding jumper used to bond exposed metal gas piping shall be not smaller than _____ AWG copper.

Question 22: Per NEC 110.12, electrical equipment shall be installed in a _____ manner.

Question 23: Per NEC 210.52(C)(2), at least one receptacle outlet shall be installed for a kitchen island countertop that has a long dimension of _____ inches or greater and a short dimension of 12 inches or greater.

Question 24: Per NEC 250.30(A)(3), the grounding electrode conductor (GEC) for a separately derived system (such as a transformer secondary) shall be connected at the _____ .

Question 25: Per NEC Table 310.15(C)(3), when conduit containing conductors is installed on a rooftop within ½ inch (13 mm) of the roof surface and exposed to direct sunlight, an additional _____ °C shall be added to the ambient temperature when calculating temperature correction factors.

Question 26: Per NEC 314.27(A)(1), a standard outlet box used as the sole support for a luminaire (light fixture) shall be capable of supporting a luminaire weighing not more than _____ pounds.

Question 27: Per NEC 330.10, Type MC (metal-clad) cable is permitted to be installed in which of the following locations that Type NM cable is NOT permitted?

Question 28: Per NEC 480.9(A), rooms or enclosures containing vented storage batteries shall be provided with adequate _____ to prevent the accumulation of an explosive mixture of gases.

Question 29: Per NEC 210.3, the recognized standard ampere ratings for multi-outlet branch circuits (other than individual branch circuits) are _____ .

Question 30: Per NEC 210.20(A), the rating of a branch circuit overcurrent protective device (OCPD) shall not be less than _____ percent of the continuous load plus 100 percent of the noncontinuous load.

Key NEC References for This Test

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