2020 Edition

Master Electrician Practice Test

Take this free practice test of typical questions that may be encountered on most Master Electrician’s licensing exams.

The subject matter covered in most electrical licensing examinations is: Grounding and bonding, Overcurrent protection, Wiring methods and installation, Boxes and fittings, Services and equipment, Motors, Special occupancies, Load calculations, Lighting, Appliances, Box and raceway fill, Hazardous locations, Trade knowledge and Electrical theory.

For complete practice, try the Master Electrican Practice Exam Kit with 300 questions and fully explained answers.

This free test is based on the 2017 National Electric Code (NEC). With Tests.com, you have the option to purchase a practice test kit based on the 2011, 2014 or 2017 NEC Codes. Check with your local code official to determine which code applies to your location.


1. The optional method of calculation for dwelling units is reserved for ___.
2. When calculating the service-entrance conductors of a farm where all the buildings, including the dwelling, are supplied from a common service, the second largest individual load in the group shall be calculated at _____.
3. The entire area of a service pit located in a commercial major repair garage that is not provided with mechanical ventilation is classified as a _____ location.
4. The MAXIMUM distance conduit seals are permitted to be installed from an enclosure that houses devices that produces arcs or high-temperatures in a Class I, Division 1 location is _____.
5. Where three (3) switches are grouped or ganged in an outlet box without permanent barriers, the voltage between the adjacent switches shall NOT exceed _____.
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6. In order to determine the adequate size of a junction box containing size 4 AWG THWN copper conductors, the volume allowance, in cubic inches, required per conductor is _____.
7. 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.
8. Where an eye-bolt is provided as a means of attachment of 120/240-volt, single-phase residential service-drop conductors, in no case shall this point of attachment be less than _____ above finished grade.
9. Given: You are to install four (4) size 350 kcmil THWN copper conductors in a run of rigid metal conduit (RMC). What is the MINIMUM trade size RMC required to enclose the conductors for this installation?
10. Where size 2 AWG THWN/THHN copper conductors, protected by a 100 ampere rated circuit breaker, are enclosed in a Schedule 40 PVC conduit to supply an air-conditioning unit, what is the MINIMUM size copper equipment grounding conductor required for this installation?
11. As a general rule, switches not over 1,000-volts containing fuses and circuit breakers shall be readily accessible and installed so that the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than _____ above the floor more working platform.
12. Underground service conductors of not over 1,000-volts that are not encased in concrete and that are buried 18 inches or more below grade, shall have their location identified by a warning ribbon that is placed in the trench at least _____ above the underground installation.
13. Where the sole support of an outdoor installed Type FS box that contains devices or supports luminaires is two (2) underground buried threaded intermediate metal conduits (IMC) or rigid metal conduits (RMC) that emerge from ground, the NEC requires the box to be no more than _____ from the point where the conduit emerges from the ground.
14. As a general rule regarding solar photovoltaic (PV) systems, supply-side conductor connections for PV systems must terminate in an overcurrent protection device that's within no more than ___ of the point of interconnection to the local electric utility.
15. Calculate the minimum demand load, in amperes, on the ungrounded service-entrance conductors for a recreational vehicle park that has 28 RV sites all with 50-ampere outlets at each RV site. Supply system is single-phase, 120/240 volts.
16. Conduit seals shall be installed at no more than _____ from the entrance of an enclosure that contains arcing or sparking equipment or only splices, taps or terminals where located in Class I, Division 1 hazardous locations.
17. When building a temporary service at a construction site _____ receptacles must be GFCI protected.

I. 125-volt, 15- and 20-ampere
II. 250-volt, 20- and 30-ampere
18. Where it is necessary to install more than one (1) ground rod used as a grounding electrode, the ground rods shall be spaced not less than _____ apart.
19. Where a transformer supplies a single-phase, 120/240-volt, 600 ampere service, the transformer should have a kVA rating of at least _____.
20. Metal conduit installed in indoor wet locations must have a minimum airspace clearance of _____ between the conduit and the wall or supporting surface.

Master Electrician Practice Exam

When a journeyman electrician is ready to move up to the master level, they can take the master electrician exam to prove they can perform this work at the master level. The exam covers electrical regulations and may involve both written and hands-on examination. Learn more about the master electricians' exam with our Journeyman & Master Electricians' Test Guide.

State Electrician Licensing Guides:

Alabama Electrician Exam

Alaska Electrician Exam

Arizona Electrician Exam

Arkansas Electrician Exam

California Electrician Exam

Colorado Electrician Exam

Connecticut Electrician Exam

Delaware Electrician Exam

Florida Electrician Exam

Georgia Electrician Exam

Hawaii Electrician Exam

Idaho Electrician Exam

Illinois Electrician Exam

Indiana Electrician Exam

Iowa Electrician Exam

Kansas Electrician Exam

Kentucky Electrician Exam

Louisiana Electrician Exam

Maine Electrician Exam

Maryland Electrician Exam

Massachusetts Electrician Exam

Michigan Electrician Exam

Minnesota Electrician Exam

Mississippi Electrician Exam

Missouri Electrician Exam

Montana Electrician Exam

Nebraska Electrician Exam

Nevada Electrician Exam

New Hampshire Electrician Exam

New Jersey Electrician Exam

New Mexico Electrician Exam

New York Electrician Exam

North Carolina Electrician Exam

North Dakota Electrician Exam

Ohio Electrician Exam

Oklahoma Electrician Exam

Oregon Electrician Exam

Pennsylvania Electrician Exam

Rhode Island Electrician Exam

South Carolina Electrician Exam

South Dakota Electrician Exam

Tennessee Electrician Exam

Texas Electrician Exam

Utah Electrician Exam

Vermont Electrician Exam

Virginia Electrician Exam

Washington Electrician Exam

West Virginia Electrician Exam

Wisconsin Electrician Exam

Wyoming Electrician Exam