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Nebraska Master Electrician Licensing Exam –
Practice Test & Study Guide (2026 Edition)
1. What is the maximum voltage drop recommended for branch circuits? A. 1% B. 3% C. 5% D. 10% Voltage drop is generally recommended not to exceed 5% total (branch + feeder combined) for efficient system performance. 2. Which NEC article covers grounding and bonding? A. Article 300 B. Article 310 C. Article 250 D. Article 400 Article 250 governs grounding and bonding requirements for electrical systems. 3. What is the minimum working clearance in front of 120/208V panels?
A. 2 feet B. 3 feet C. 4 feet D. 5 feet NEC requires at least 3 feet of clearance for safe access to electrical equipment.
4. The purpose of a GFCI is to protect against: A. Overvoltage B. Short circuits C. Ground faults D. Overcurrent GFCIs detect imbalance in current and trip during ground faults to prevent shock. 5. The standard color for a grounded conductor is: A. Green B. Red C. White or gray D. Black Neutral (grounded) conductors are required to be white or gray under NEC rules. 6. Which device protects against overcurrent? A. Transformer B. Circuit breaker
D. Watt Watts measure real electrical power consumption.
10. Which is a conductor material commonly used in wiring? A. Rubber B. Glass C. Copper D. Wood Copper is widely used due to excellent conductivity and durability. 11. What does NEC stand for? A. National Electrical Certification B. National Electrical Code C. National Energy Control D. Network Electrical Code NEC is the standard for safe electrical installation. 12. Which tool is used to measure resistance? A. Ammeter B. Voltmeter C. Wattmeter D. Ohmmeter Ohmmeters measure resistance in ohms.
13. The formula V = IR represents: A. Power law B. Energy law C. Ohm’s Law D. Kirchhoff’s Law Ohm’s Law defines relationship between voltage, current, and resistance. 14. What is the main purpose of a disconnect switch? A. Increase voltage B. Isolate equipment C. Store energy D. Reduce resistance Disconnects allow safe isolation of equipment for maintenance. 15. Which conduit type is most flexible? A. EMT B. Rigid metal C. PVC D. Flexible metal conduit (FMC) FMC allows easy routing in tight or moving installations. 16. What is the standard frequency of power in the U.S.? A. 50 Hz B. 100 Hz
Motor operation depends on interaction between rotor and stator fields.
20. What is the purpose of bonding? A. Increase resistance B. Ensure electrical continuity C. Store current D. Reduce voltage Bonding ensures metallic parts are electrically connected. 21. Which is a semiconductor material? A. Copper B. Aluminum C. Silicon D. Gold Silicon is widely used in electronic components. 22. What does an arc fault breaker detect? A. Ground moisture B. Voltage spikes C. Arcing conditions D. Frequency changes AFDDs detect dangerous arc faults that may cause fires. 23. What is the purpose of a relay?
A. Increase resistance B. Store energy C. Control a circuit using low power signal D. Convert AC to DC Relays use electromagnetic switches for control.
24. Which wire is typically grounded? A. Hot wire B. Neutral wire C. Equipment grounding conductor D. Load wire Grounding conductors provide fault current path. 25. What is capacitance measured in? A. Ohms B. Volts C. Farads D. Watts Capacitance is the ability to store charge. 26. What is the main function of an inverter? A. Step up voltage B. Step down voltage C. Convert DC to AC D. Store energy Inverters change DC power to AC.
C. Ammeter D. Thermometer Ammeters measure current flow in amperes.
31. What is the purpose of insulation on wires? A. Conduct electricity B. Increase voltage C. Prevent electrical contact and leakage D. Reduce current Insulation prevents unintended current flow. 32. What does KVA stand for? A. Kilovolt Ampere B. Kilovolt Average C. Kilovolt-Ampere D. Kilowatt Ampere KVA represents apparent power. 33. What is the function of a capacitor? A. Store resistance B. Increase current C. Store electrical charge D. Convert AC to DC Capacitors store and release energy.
34. Which color wire is typically hot in 240V systems? A. White B. Green C. Black or red D. Gray Hot conductors are commonly black or red. 35. What is inductance measured in? A. Ohms B. Farads C. Henries D. Watts Inductance opposes changes in current. 36. What is the purpose of a circuit breaker trip curve? A. Increase voltage B. Store energy C. Define trip response time D. Reduce resistance Trip curves show how fast breakers respond to faults. 37. What is the main purpose of grounding electrodes? A. Increase voltage B. Reduce load C. Connect system to earth
A. P = V/R
B. P = I/R
C. P = VI
D. P = V + I
Power equals voltage times current.
42. What device protects against lightning surges? A. Fuse B. Breaker C. Surge protector D. Transformer Surge protectors divert excess voltage. 43. What is the purpose of a busbar? A. Insulate wires B. Store energy C. Distribute electrical power D. Reduce current Busbars distribute high current efficiently. 44. What is the unit of frequency? A. Volt B. Amp C. Hertz D. Ohm Frequency is measured in hertz.
45. What is the purpose of PPE in electrical work? A. Increase efficiency B. Protect worker safety C. Improve conductivity D. Reduce voltage PPE prevents injury from hazards. 46. What is the effect of series circuits? A. Voltage increases B. Current increases C. Resistance increases D. Power doubles Series circuits increase total resistance. 47. What is the purpose of a contactor? A. Measure voltage B. Store energy C. Switch high power circuits D. Convert AC to DC Contactors control large loads remotely. 48. What is the function of a step-up transformer? A. Reduce voltage B. Store energy
52. What is the minimum size copper grounding electrode conductor for most services? A. 10 AWG B. 8 AWG C. 6 AWG D. 4 AWG 6 AWG copper is commonly required for grounding electrode conductors. 53. What is the function of a lightning arrestor? A. Store current B. Increase voltage C. Divert surge voltage to ground D. Reduce resistance It protects systems from lightning-induced surges. 54. What does a megohmmeter measure? A. Current B. Voltage C. Power D. Insulation resistance Megohmmeters test high-resistance insulation integrity. 55. What is the maximum fill percentage for conduit with more than two conductors?
A. 31%
B. 40%
C. 40% (typical NEC rule for >2 wires) D. 60% NEC limits conduit fill to prevent overheating and damage.
56. Which device is used for motor overload protection? A. Fuse B. Breaker C. Thermal overload relay D. Transformer Overload relays protect motors from sustained overcurrent. 57. What is the purpose of a phase converter? A. Increase voltage B. Store energy C. Convert single-phase to three-phase power D. Reduce resistance Used when three-phase equipment is powered from single- phase supply. 58. What is the typical voltage of a residential split-phase system? A. 120V only B. 240V only C. 120/240V
62. What does IP rating indicate? A. Power input B. Insulation property C. Ingress protection against dust and water D. Internal power IP ratings define environmental protection levels. 63. What is the function of a capacitor in motor starting? A. Reduce speed B. Increase resistance C. Provide starting torque D. Decrease voltage Capacitors help single-phase motors start rotating. 64. What is the purpose of neutral grounding resistor systems? A. Increase current B. Store energy C. Limit fault current in large systems D. Reduce voltage They protect equipment in medium/high voltage systems. 65. What is the unit of electrical conductance? A. Ohm B. Volt C. Watt
D. Siemens Conductance is the inverse of resistance.
66. What is the main purpose of a disconnecting means in HVAC equipment? A. Increase efficiency B. Store energy C. Allow safe servicing isolation D. Step up voltage Required for maintenance safety. 67. What is the function of a ground bar in a panel? A. Increase voltage B. Store current C. Provide termination point for grounding conductors D. Reduce resistance Ground bars connect equipment grounding conductors. 68. What is the minimum burial depth for direct-buried cables under residential lawns? A. 6 inches B. 12 inches C. 18 inches D. 36 inches NEC specifies minimum depths for safety and protection.
