2022 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 2014, 2017 or 2020 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 ___. a. multifamily dwelling units only b. dwelling units with over 3,000 sq. ft. of usable space c. dwelling units supplied by service conductors with an ampacity of 100 amperes or greater. d. dwelling units with a 208Y/120-volt, 3-phase, electrical system only
 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 _____. a. 60 percent b. 75 percent c. 80 percent d. 90 percent
 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. a. Class I, Division 1 b. Class I, Division 2 c. Class II, Division 1 d. Class II, Division 2
 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 _____. a. 6 inches b. 24 inches c. 12 inches d. 18 inches
 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 _____. a. 150 volts b. 250 volts c. 300 volts d. 240 volts
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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 _____. a. 5.00 cu. in. b. 5.50 cu. in. c. 6.25 cu. in. d. None of these
 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. a. 12 inches b. 18 inches c. 24 inches d. 30 inches
 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. a. 10 feet b. 12 feet c. 15 feet d. 18 feet
 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? a. 2½ in. b. 3 in. c. 3½ in. d. 4 in.
 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? a. 2 AWG b. 4 AWG c. 6 AWG d. 8 AWG
 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. a. 6 ft. b. 6 ft., 6 in. c. 6 ft., 7 in. d. 7 ft.
 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. a. 6 inches b. 10 inches c. 8 inches d. 12 inches
 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. a. 12 inches b. 18 inches c. 15 inches d. 24 inches
 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. a. 10 feet b. 6 feet c. 15 feet d. 20 feet
 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. a. 1,120 amperes b. 639 amperes c. 588 amperes d. 1,400 amperes
 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. a. 12 inches b. 6 inches c. 24 inches d. 18 inches
 17. When building a temporary service at a construction site _____ receptacles must be GFCI protected.I. 125-volt, 15- and 20-ampereII. 250-volt, 20- and 30-ampere a. I only b. II only c. both I and II d. neither I nor II
 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. a. 4 feet b. 6 feet c. 8 feet d. 10 feet
 19. Where a transformer supplies a single-phase, 120/240-volt, 600 ampere service, the transformer should have a kVA rating of at least _____. a. 300 kVA b. 112.5 kVA c. 225 kVA d. 150 kVA
 20. Metal conduit installed in indoor wet locations must have a minimum airspace clearance of _____ between the conduit and the wall or supporting surface. a. 1/8 in. b. 1/4 in. c. 1/2 in. d. 3/8 in.

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

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