2023 Edition

Electrician Practice Test

Take a free Electrician Practice Test to see what kind of questions are on actual electrician license exams.  Most states require an electrician to pass an exam to receive a journeyman or master electrician license.   State exams cover such areas as Electrical Theory, Trade Knowledge, Grounding and Bonding, Wiring Methods and Installation, Overcurrent Protection, Load Calculations, etc. This practice test is broken into sections (Journeyman and Master) and is based on the 2020 NEC and 2023 NEC where indicated.  

To prepare for your actual Electrician Exam, these two practice exams by Ray Holder (Master Electrician and Certified Electrical Trade Instructor) have 300 questions with fully explained answers:

With Tests.com, you have the option to purchase a practice test kit based on the 2014, 2017, 2020 or 2023 NEC. Check with your local code official to determine which code applies to your location.

Journeyman Electrician (2020 NEC)

1. Where insulated power and lighting conductors are installed in raceways, an ampacity adjustment must be applied where _____.

 I. there are more than three (3) current-current carrying conductors in the same raceway         
II. an ambient temperature other than 86°F is encountered
2. According to the Code, flexible metal conduit (FMC) enclosing circuit conductors is not approved for use as a type of an equipment grounding conductor in lengths exceeding _____.
3. Where a single 125-volt, single-phase, 20-ampere receptacle outlet located in an attached garage of a dwelling unit is provided for a central vacuum assembly, the receptacle outlet is required to have _____.
4. Where Type NM cable is used as the wiring method for "home runs" for power and lighting branch circuits in a dwelling, the minimum size copper required is _____.
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5. When single-phase, 125-volt, 15- or 20-ampere receptacles are housed in a device box located outdoors in a wet location, the receptacles shall have an enclosure that is listed as _____ whether or not the attachment plug cap is inserted.
6. For one-family dwellings supplied by a single-phase, 120/240-volt system, and having a 200-ampere rated inverse time circuit breaker for the main disconnecting means, what minimum size THWN aluminum conductors are permitted for use as ungrounded service-entrance conductors? Given: No adjustment or correction factors are required.
7. If a 1¾ in. deep, single-gang, Type FS device box houses a duplex receptacle, how many insulated size 12 AWG conductors are permitted to be enclosed in the FS box?
8. The required 15- or 20-ampere receptacle outlet for a peninsular countertop or work surface in the kitchen of a dwelling must be located not further than _____from the outer edge of the peninsular countertop.
9. In compliance with the rules established by the NEC®, all 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlet or devices in specific areas or rooms of a dwelling unit shall be provided with arc-fault circuit-interrupter protection. Where Type NM cable is used as the wiring method for "home runs" in the dwelling, the maximum length of the cable from the overcurrent device to the first outlet shall not exceed _____ for size 14 AWG NM cable and _____ for size 12 AWG NM cable.
10. The Code mandates a clearly labeled emergency disconnect is to be provided at each service for one- and two-family dwelling units. The emergency disconnect is permitted to be installed _____.

Journeyman Electrician (2023 NEC)

11. A general Code rule is, as viewed from the front of a switchboard or panelboard the _____ be the phase having the higher voltage to ground on 3-phase, 4-wire delta-connected systems.
12. Which of the following single-phase receptacle outlets in a dwelling are required to have ground-fault protection for personnel?
13. Where one- and two family dwellings are supplied with a single-phase, 120/240-volt electrical system from the local utility company and the service demand load is not more than 400 amperes, for sizing the ungrounded (phase) service-entrance conductors, the conductors shall be permitted to have an ampacity of not less than _____ of the values shown in Table 310.16
14. Where four (4) or more current-carrying conductors are installed in a common raceway, the ampacity of each current-carrying conductor must be determined by applying the percentage values as given in Table _____ of the Code.
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15. Where an inverse-time circuit breaker is used as a disconnecting means for an air-conditioning unit, the ampere rating of the circuit breaker shall be not less than _____ of the A/C nameplate rated-load current or branch-circuit selection, whichever is greater.
16. What is the required size 75°C copper service-entrance conductors for a 200-ampere, 120/240-volt, single-phase commercial service where elevated ambient temperature is not a concern?
17. In reference to the mechanical execution of electrical work, the 2023 edition of the NEC states, electrical equipment shall be installed _____.
18. Ceiling-suspended (paddle) fans weighing more than _____ shall be supported independently of the outlet box.
19. Where a 112½ kVA transformer having a single-phase, 120/240-volt secondary is installed at a multifamily dwelling unit, the full-load current rating, in amperes, of the secondary is ____.

Master Electrician (2020 NEC)

20. No grounded conductor shall be attached to any terminal or lead so as to _____ the designated polarity.
21. In compliance with the Code, liquidtight flexible metal conduit (LFMC) enclosing power and lighting circuit conductors is not considered an effective ground-fault current path where the length of the LFMC exceeds _____.
22. For a 3-phase, continuous duty, induction-type motor, Table 430.250 is not used to determine the _____ for the motor.
23. As specified in the Code, where are you required to make the connection between the equipment grounding conductor and the grounded neutral conductor at a 208Y/120-volt, 3-phase, 4-wire service?
24. Given: A hot tub is to located in the common area of a multifamily dwelling unit; a clearly labeled emergency shutoff or control switch for the purpose of stopping the motor(s) of the water recirculation and jet system is required to be installed for the users at a readily accessible location and NOT less than _____ from the hot tub.
25. The disconnecting means for air-conditioning or refrigeration equipment shall NOT be located _____.
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26. The required support distance for exposed vertical rigid metal conduit (RMC) risers from industrial machinery or fixed equipment, where the RMC is made up with threaded couplings, the conduit is supported and securely fastened at the top and bottom of the riser, and no other means of intermediate is readily available is ___.
27. When installing an emergency back-up generator with an output of 22 kW, single-phase, 120/240-volts for a farm house, the ampacity of phase conductors from the generator terminals to the first overcurrent protective device shall not be less than ____ of the nameplate current rating of the generator where the design of the generator does not prevent overloading.
28. For freestanding type, cord-and plug connected office furnishings, which of the following is NOT permitted?
29. According to the Code, flexible metal conduit (FMC) enclosing circuit conductors is not approved for use as a type of an equipment grounding conductor in trade sizes larger than _____.
30. What is the MINIMUM size wire-type copper equipment grounding conductor required for a 20-ampere rated branch circuit installed in PVC conduit that supplies a swimming pool pump motor?

Master Electrician (2023 NEC)

31. Where installed for services of 1000 volts or less, Type 1 SPDs shall be connected to _____.
32. Where size 4 AWG THW copper conductors are connected to termination lugs having a temperature rating of 60 in a panelboard, what is the ampacity of the conductors?
33. The dedicated equipment space above outdoor installed switchgear, panelboards and motor control centers, of 1000 volts or less, extends from final grade to a height of not less than _____ above the equipment. This space is dedicated for the electrical installation.
34. As a general NEC rule, where ambient temperature, voltage drop, and the number of current-carrying conductors are not a factor, what size 75 copper ungrounded (phase) feeder conductors are required to supply a 200 ampere continuous load?
35. Given: A commercial occupancy is to be supplied from a transformer having a 480Y/277-volt, three-phase primary and a 208Y/120-volt, three-phase secondary. The secondary will have a balanced computed connected demand load of 416 amperes per phase. The transformer is required to have a kVA rating of at least _____.
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36. Where an inverse-time circuit breaker serves as a disconnecting means for a hermetic refrigerant motor-compressor, the circuit breaker is required to have an ampere rating of at least _____ of the nameplate current rating of the equipment or the branch-circuit selection current, whichever is greater.
37. Given: You are to install an underground run of trade size 2 in. Schedule 40 PVC conduit containing 120/240-volt, single-phase service-entrance conductors supplying a one-family dwelling. The PVC will not cross under any public streets, roads, driveways or alleys. The conduit is to have a burial depth of at LEAST _____ from final grade.
38. Where four (4) current-carrying size 2 AWG THHN copper conductors are installed in a raceway where the ambient temperature is 100ºF, the ampacity of the conductors is _____.
39. When installing underground service conductors for a dwelling where the conductors are not encased in concrete and are buried 18 inches or more below the earth, the conductors are mandated to have the location identified by a warning ribbon that is placed not more than _____ above the underground installation.
40. Determine the required number of 120-volt, 15-ampere general lighting branch circuits for a dwelling unit with 1,950 sq. ft. of habitable space.

Master Electrician Practice Exam

Construction Trades Practice Tests

Electrician Practice

Master Electrician Practice Exam

Master Electrician Practice Exam

Construction Trades Practice Tests

Quality starts with who wrote the material.
Our practice exam writer
Ray Holder
Certified Electrical Trade Instructor & Electrician License Exam Expert

Ray Holder Journeyman Electrician Practice Exam

Ray has worked in the electrical industry for over 45 years as an apprentice, journeyman, master, field engineer, estimator, business manager, contractor, inspector, consultant and instructor.

He holds a Bachelor of Science degree in Occupational Education and a lifetime Vocational Education teaching certificate from the Texas Education Agency.

Ray is a certified instructor of electrical trades. His classes are presented in a simplified, easy-to-understand format for electricians. Ray is currently the Director of Education for Electrical Seminars, Inc.

He is an active member of the International Association of Electrical Inspectors and a retired member of the International Brotherhood of Electrical Workers