MONTANA DEPARTMENT OF LABOR AND
INDUSTRY MASTER ELECTRICIAN
EXAMINATION (MEE) Questions with
Detailed ANSWERs and Rationales ACTUAL !!
2026
QUESTION 1
What is the minimum burial depth for rigid metal conduit (RMC) under a residential driveway?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
ANSWER: B. 12 inches
Rationale: Rigid metal conduit provides strong mechanical protection, allowing reduced burial
depth compared to other wiring methods. Under residential driveways, RMC requires only 12
inches of cover per NEC Table 300.5, while other methods require greater depths. The superior
mechanical strength of RMC makes it suitable for shallow burial in areas subject to vehicle
traffic.
QUESTION 2
,What is the allowable voltage drop recommended for branch circuits?
A) 1%
B) 3%
C) 5%
D) 10%
ANSWER: B. 3%
Rationale: The NEC recommends a maximum of 3% voltage drop for branch circuits to ensure
proper equipment operation and energy efficiency. Combined with feeder drops, total voltage
drop should not exceed 5%. Excessive voltage drop can cause motors to overheat, lights to dim,
and equipment to malfunction.
QUESTION 3
What type of motor is most commonly used in residential HVAC systems?
A) Synchronous motor
B) Universal motor
C) Induction motor
D) Stepper motor
ANSWER: C. Induction motor
Rationale: Induction motors are reliable, efficient, and well-suited for continuous operation in
HVAC applications. They require minimal maintenance, operate at relatively constant speed,
,and are cost-effective for residential use. Their simple construction and robust design make
them ideal for compressor and fan applications.
QUESTION 4
What is the minimum conductor size for a 20-amp branch circuit?
A) 14 AWG
B) 12 AWG
C) 10 AWG
D) 8 AWG
ANSWER: B. 12 AWG
Rationale: NEC Table 310.16 requires 12 AWG copper conductors for 20-ampere circuits. While
14 AWG is rated for 15 amps, it cannot be used on 20-amp circuits as it would create a fire
hazard. Upsizing to 10 AWG or 8 AWG is permissible but typically unnecessary and more
expensive.
QUESTION 5
What device protects against ground faults?
A) AFCI
B) GFCI
C) Fuse
D) Relay
, ANSWER: B. GFCI
Rationale: Ground Fault Circuit Interrupters detect current imbalances between hot and neutral
conductors, typically as low as 4-6 milliamps, and trip within milliseconds to prevent
electrocution. AFCIs protect against arc faults while fuses and relays provide overcurrent
protection, but neither offers ground fault protection.
QUESTION 6
What is the standard voltage of a single-phase residential system in the U.S.?
A) 120/208V
B) 120/240V
C) 277/480V
D) 240/480V
ANSWER: B. 120/240V
Rationale: The standard residential service in the United States is 120/240V single-phase,
derived from a center-tapped transformer. This configuration provides 120V for general lighting
and receptacle loads, and 240V for major appliances like ranges, dryers, and HVAC equipment.
QUESTION 7
How many conductors are required for a 120/240V single-phase service?
A) 2 conductors
B) 3 conductors
C) 4 conductors
INDUSTRY MASTER ELECTRICIAN
EXAMINATION (MEE) Questions with
Detailed ANSWERs and Rationales ACTUAL !!
2026
QUESTION 1
What is the minimum burial depth for rigid metal conduit (RMC) under a residential driveway?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
ANSWER: B. 12 inches
Rationale: Rigid metal conduit provides strong mechanical protection, allowing reduced burial
depth compared to other wiring methods. Under residential driveways, RMC requires only 12
inches of cover per NEC Table 300.5, while other methods require greater depths. The superior
mechanical strength of RMC makes it suitable for shallow burial in areas subject to vehicle
traffic.
QUESTION 2
,What is the allowable voltage drop recommended for branch circuits?
A) 1%
B) 3%
C) 5%
D) 10%
ANSWER: B. 3%
Rationale: The NEC recommends a maximum of 3% voltage drop for branch circuits to ensure
proper equipment operation and energy efficiency. Combined with feeder drops, total voltage
drop should not exceed 5%. Excessive voltage drop can cause motors to overheat, lights to dim,
and equipment to malfunction.
QUESTION 3
What type of motor is most commonly used in residential HVAC systems?
A) Synchronous motor
B) Universal motor
C) Induction motor
D) Stepper motor
ANSWER: C. Induction motor
Rationale: Induction motors are reliable, efficient, and well-suited for continuous operation in
HVAC applications. They require minimal maintenance, operate at relatively constant speed,
,and are cost-effective for residential use. Their simple construction and robust design make
them ideal for compressor and fan applications.
QUESTION 4
What is the minimum conductor size for a 20-amp branch circuit?
A) 14 AWG
B) 12 AWG
C) 10 AWG
D) 8 AWG
ANSWER: B. 12 AWG
Rationale: NEC Table 310.16 requires 12 AWG copper conductors for 20-ampere circuits. While
14 AWG is rated for 15 amps, it cannot be used on 20-amp circuits as it would create a fire
hazard. Upsizing to 10 AWG or 8 AWG is permissible but typically unnecessary and more
expensive.
QUESTION 5
What device protects against ground faults?
A) AFCI
B) GFCI
C) Fuse
D) Relay
, ANSWER: B. GFCI
Rationale: Ground Fault Circuit Interrupters detect current imbalances between hot and neutral
conductors, typically as low as 4-6 milliamps, and trip within milliseconds to prevent
electrocution. AFCIs protect against arc faults while fuses and relays provide overcurrent
protection, but neither offers ground fault protection.
QUESTION 6
What is the standard voltage of a single-phase residential system in the U.S.?
A) 120/208V
B) 120/240V
C) 277/480V
D) 240/480V
ANSWER: B. 120/240V
Rationale: The standard residential service in the United States is 120/240V single-phase,
derived from a center-tapped transformer. This configuration provides 120V for general lighting
and receptacle loads, and 240V for major appliances like ranges, dryers, and HVAC equipment.
QUESTION 7
How many conductors are required for a 120/240V single-phase service?
A) 2 conductors
B) 3 conductors
C) 4 conductors
