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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 38

Free Online Journeyman Electrician Exam Practice Test — 38This free 30-question practice test covers journeyman electrician exam topics based on the 2023 NEC, including mobile home power supply (NEC 550), pool pump GFCI (NEC 680), parallel conductor minimum size (NEC 310), plug fuse voltage rating (NEC 240), service drop clearances (NEC 230), ammeter connections, transformer secondary current calculations, central heating individual branch circuits (NEC 422), small appliance circuits (NEC 210), and shared circuit appliance load limits.

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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.

Key rules: Mobile home power supply = 50A (NEC 550.10(A)). Pool pump motors must have GFCI protection (NEC 680.21(C)). Parallel conductors minimum 1/0 AWG (NEC 310.10(H)(1)). Plug fuses max 125V (NEC 240.50(A)). Service drop above general grade = 10 ft minimum (NEC 230.24(B)). Central heating must be on an individual branch circuit — not a multi-wire circuit (NEC 422.12). Two 20A small appliance circuits required in kitchens (NEC 210.11(C)(1)). When a branch circuit has both lighting and a fastened-in-place appliance, the appliance load shall not exceed 50% of circuit rating (NEC 210.23(A)(2)).

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45 min

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Journeyman Electrician Practice Test 38 — Question List

Question 1: What is the maximum ampere rating of a power supply feeder of mobile homes?

30 amperes
50 amperes
20 amperes
15 amperes

NEC Reference: NEC 550.10(A)

Question 2: Whether by receptacle or direct connection, the outlets supplying pool pump motors shall be provided with _____ protection.

GFCI
over current
over voltage

NEC Reference: NEC 680.21(C)

Question 3: To use as parallel feeder or service what is the minimum size of the conductor?

1/0 AWG
2/0 AWG
8 AWG
14 AWG

NEC Reference: NEC 310.10(H)(1)

Question 4: What is the maximum voltage rating of a plug fuse?

125 volts
240 volts
120 volts
480 volts

NEC Reference: NEC 240.50(A)

Question 5: What is the minimum height of service drop at the electrical entrance of the building?

10 feet
8 feet
12 feet
15 feet

NEC Reference: NEC 230.24(B)

Question 6: Which of the following way the ammeter is connected in a circuit?

In series with circuit elements
In parallel with circuit elements

Question 7: The primary of transformer draws 5 amperes at 480 volts. The voltmeter reading at secondary is 240 volts. What is its ammeter reading at secondary?

Question 8: As per NEC central heating equipment can be supplied by a multi-wire branch circuit?

False
True

NEC Reference: NEC 422.12

Question 9: How many minimum number of 20-ampere branch circuits are required for dwelling unit countertop receptacles?

NEC Reference: NEC 210.11(C)(1)

Question 10: A lighting unit is connected on a 20 ampere branch circuit on which a fastened-in place appliance is located. What is the maximum percentage branch circuit rating is permitted on the appliance?

80 %
70 %
50 %
60 %

NEC Reference: NEC 210.23(A)(2)

Question 11: Per NEC 406.12, all nonlocking-type, 125-volt, 15- and 20-ampere receptacles installed in the locations specified in NEC 210.52 (standard dwelling unit receptacle locations) shall be _____ .

Listed tamper-resistant receptacles
GFCI-type receptacles only
20-ampere rated duplex receptacles only
Standard receptacles — no special requirement

NEC Reference: NEC 406.12

Question 12: Per NEC 410.10(A), a luminaire (light fixture) installed in a wet location shall be marked as suitable for _____ .

Suitable for damp locations only
Suitable for wet locations
Suitable for dry locations only
Any outdoor fixture — no marking needed

NEC Reference: NEC 410.10(A)

Question 13: Per NEC 430.32(A)(1), the overload protective device for a motor with no marked service factor rating and no marked temperature rise rating shall be selected to trip or be rated at not more than _____ percent of the motor's nameplate full-load amperes (FLA).

100%
115%
125%
175%

NEC Reference: NEC 430.32(A)(1)

Question 14: Per NEC 440.14, the disconnecting means for air-conditioning or refrigeration equipment shall be located _____ .

At the main electrical panel only
Within sight from and readily accessible from the A/C equipment
At least 25 feet from the A/C unit for safety
Only at the outdoor disconnect — indoor units need none

NEC Reference: NEC 440.14

Question 15: Per NEC 445.13(A), the ampacity of the conductors from a generator terminal shall not be less than _____ percent of the nameplate current rating of the generator.

100%
115%
125%
150%

NEC Reference: NEC 445.13(A)

Question 16: A 480V transformer has a rated primary current of 20 amperes and has overcurrent protection on the secondary side. Per NEC 450.3(B), the maximum rating of the primary overcurrent protective device shall be _____ amperes.

20 amperes (100% of rated current)
25 amperes (125% of rated current)
30 amperes
40 amperes (200% of rated current)

NEC Reference: NEC 450.3(B)

Question 17: Per NEC 400.8(1), flexible cords and cables shall NOT be used as _____ .

A temporary connection for portable tools (which is permitted)
A substitute for the fixed wiring of a structure
A supply cord for appliances (which is permitted)
A connection for portable lighting (which is permitted)

NEC Reference: NEC 400.8(1)

Question 18: Per NEC 350.30(A), liquidtight flexible metal conduit (LFMC) shall be secured within _____ of each outlet box, device box, conduit body, or other conduit termination.

6 inches
12 inches
18 inches
24 inches

NEC Reference: NEC 350.30(A)

Question 19: Per NEC 358.30(A), electrical metallic tubing (EMT) shall be securely fastened at intervals not exceeding _____ feet and within 3 feet of each outlet box, junction box, device box, or other conduit termination.

3 feet
6 feet
10 feet
15 feet

NEC Reference: NEC 358.30(A)

Question 20: Per NEC 230.95(A), ground-fault protection of equipment (GFP) is required for solidly grounded wye electrical services of more than 150 volts to ground but not exceeding 600 volts phase-to-phase, where the service disconnect is rated _____ amperes or more.

200 amperes
400 amperes
800 amperes
1,000 amperes

NEC Reference: NEC 230.95(A)

Question 21: Per NEC 220.14(K), the load for a commercial show window shall be calculated at not less than _____ per linear foot of show window.

100 VA per linear foot
150 VA per linear foot
180 VA per linear foot
200 VA per linear foot

NEC Reference: NEC 220.14(K)

Question 22: Per NEC 424.3(A), fixed electric space-heating equipment (such as electric baseboard heaters) shall be supplied by _____ .

Any available branch circuit
An individual branch circuit
A multi-wire branch circuit (shared neutral)
The same circuit as the furnace

NEC Reference: NEC 424.3(A)

Question 23: Per NEC 250.52(A)(5), rod and pipe electrodes (ground rods) shall be at least _____ in length and shall be of approved materials.

4 feet
6 feet
8 feet
10 feet

NEC Reference: NEC 250.52(A)(5)

Question 24: Per NEC 240.24(A), overcurrent protective devices (circuit breakers and fuses) shall be _____ .

Locked at all times to prevent tampering
Readily accessible
Located within 3 feet of the load they protect
Mounted on the exterior of the building only

NEC Reference: NEC 240.24(A)

Question 25: Per NEC 210.52(E)(1), a one-family dwelling shall have at least one outdoor receptacle outlet accessible at grade level at the _____ of the dwelling.

Front only
Back only
Front and back of the dwelling
No outdoor receptacles are required by the NEC

NEC Reference: NEC 210.52(E)(1)

Question 26: Per NEC 210.52(F), at least one receptacle outlet shall be installed on an outdoor balcony, deck, or porch of a dwelling unit that is accessible from inside the dwelling AND has a floor area of _____ square feet or greater.

10 square feet
15 square feet
20 square feet
25 square feet

NEC Reference: NEC 210.52(F)

Question 27: Per NEC 210.8(A)(7), in dwelling units, GFCI protection is required for all 125-volt, 15- and 20-ampere receptacles installed within _____ of the outside edge of a sink (in areas other than kitchens).

3 feet
6 feet
8 feet
10 feet

NEC Reference: NEC 210.8(A)(7)

Question 28: Per NEC 600.6(A), the disconnecting means for an electric sign shall be located within _____ .

The main service panel only
Within sight of the sign it controls
At least 50 feet away from the sign
Inside the sign housing only

NEC Reference: NEC 600.6(A)

Question 29: In an AC circuit containing a capacitor, the capacitive reactance (XC) will _____ if the frequency of the supply voltage is increased.

Increase
Decrease
Stay the same
Drop to zero immediately

Question 30: Per NEC 408.4(B), every circuit in a panelboard shall be legibly identified as to its clear, evident, and specific _____ . This identification shall be kept accurate and current at all times.

Ampere rating and wire gauge
Purpose or use, specific enough for safe maintenance
Date of installation only
Nothing — circuit directories are optional

NEC Reference: NEC 408.4(B)

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 38

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Key NEC References for This Test

Journeyman Electrician Practice Test 38

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Journeyman Electrician Practice Test 38 — Question List

Question 1: What is the maximum ampere rating of a power supply feeder of mobile homes?

Question 2: Whether by receptacle or direct connection, the outlets supplying pool pump motors shall be provided with _____ protection.

Question 3: To use as parallel feeder or service what is the minimum size of the conductor?

Question 4: What is the maximum voltage rating of a plug fuse?

Question 5: What is the minimum height of service drop at the electrical entrance of the building?

Question 6: Which of the following way the ammeter is connected in a circuit?

Question 7: The primary of transformer draws 5 amperes at 480 volts. The voltmeter reading at secondary is 240 volts. What is its ammeter reading at secondary?

Question 8: As per NEC central heating equipment can be supplied by a multi-wire branch circuit?

Question 9: How many minimum number of 20-ampere branch circuits are required for dwelling unit countertop receptacles?

Question 10: A lighting unit is connected on a 20 ampere branch circuit on which a fastened-in place appliance is located. What is the maximum percentage branch circuit rating is permitted on the appliance?

Question 11: Per NEC 406.12, all nonlocking-type, 125-volt, 15- and 20-ampere receptacles installed in the locations specified in NEC 210.52 (standard dwelling unit receptacle locations) shall be _____ .

Question 12: Per NEC 410.10(A), a luminaire (light fixture) installed in a wet location shall be marked as suitable for _____ .

Question 13: Per NEC 430.32(A)(1), the overload protective device for a motor with no marked service factor rating and no marked temperature rise rating shall be selected to trip or be rated at not more than _____ percent of the motor's nameplate full-load amperes (FLA).

Question 14: Per NEC 440.14, the disconnecting means for air-conditioning or refrigeration equipment shall be located _____ .

Question 15: Per NEC 445.13(A), the ampacity of the conductors from a generator terminal shall not be less than _____ percent of the nameplate current rating of the generator.

Question 16: A 480V transformer has a rated primary current of 20 amperes and has overcurrent protection on the secondary side. Per NEC 450.3(B), the maximum rating of the primary overcurrent protective device shall be _____ amperes.

Question 17: Per NEC 400.8(1), flexible cords and cables shall NOT be used as _____ .

Question 18: Per NEC 350.30(A), liquidtight flexible metal conduit (LFMC) shall be secured within _____ of each outlet box, device box, conduit body, or other conduit termination.

Question 19: Per NEC 358.30(A), electrical metallic tubing (EMT) shall be securely fastened at intervals not exceeding _____ feet and within 3 feet of each outlet box, junction box, device box, or other conduit termination.

Question 20: Per NEC 230.95(A), ground-fault protection of equipment (GFP) is required for solidly grounded wye electrical services of more than 150 volts to ground but not exceeding 600 volts phase-to-phase, where the service disconnect is rated _____ amperes or more.

Question 21: Per NEC 220.14(K), the load for a commercial show window shall be calculated at not less than _____ per linear foot of show window.

Question 22: Per NEC 424.3(A), fixed electric space-heating equipment (such as electric baseboard heaters) shall be supplied by _____ .

Question 23: Per NEC 250.52(A)(5), rod and pipe electrodes (ground rods) shall be at least _____ in length and shall be of approved materials.

Question 24: Per NEC 240.24(A), overcurrent protective devices (circuit breakers and fuses) shall be _____ .

Question 25: Per NEC 210.52(E)(1), a one-family dwelling shall have at least one outdoor receptacle outlet accessible at grade level at the _____ of the dwelling.

Question 26: Per NEC 210.52(F), at least one receptacle outlet shall be installed on an outdoor balcony, deck, or porch of a dwelling unit that is accessible from inside the dwelling AND has a floor area of _____ square feet or greater.

Question 27: Per NEC 210.8(A)(7), in dwelling units, GFCI protection is required for all 125-volt, 15- and 20-ampere receptacles installed within _____ of the outside edge of a sink (in areas other than kitchens).

Question 28: Per NEC 600.6(A), the disconnecting means for an electric sign shall be located within _____ .

Question 29: In an AC circuit containing a capacitor, the capacitive reactance (XC) will _____ if the frequency of the supply voltage is increased.

Question 30: Per NEC 408.4(B), every circuit in a panelboard shall be legibly identified as to its clear, evident, and specific _____ . This identification shall be kept accurate and current at all times.

Key NEC References for This Test

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