Master Electrician Licensing Exam

Master Electrician Licensing Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the maximum allowable voltage drop for a feeder circuit to

ensure efficient operation?

• 1%
• 3%
• 5%

D) 10%

Rationale: NEC recommends a maximum of 5% voltage drop for

feeders and branch circuits to maintain equipment efficiency and prevent overheating.

• Which conductor is typically used as a grounding conductor?
• Black
• White
• Green or bare copper 1 / 4

• Red

Rationale: Green or bare copper wires are designated for grounding to

provide a safe path for fault current.

• According to the NEC, how often should arc-fault circuit interrupters

(AFCIs) be installed in dwelling unit bedrooms?

• Only in kitchens
• Only in living rooms
• In all bedrooms
• Only in garages

Rationale: NEC 210.12 requires AFCIs in all dwelling unit bedrooms to

reduce fire risk from arc faults.

• What is the maximum ampacity of a 12 AWG copper conductor in a

residential application under normal conditions?

A) 10A

B) 15A

C) 20A

D) 25A

Rationale: According to NEC Table 310.15(B)(16), 12 AWG copper

conductors are rated for 20 amps.

• Which device protects against overcurrent caused by short circuits or

overloads?

• Transformer
• Circuit breaker 2 / 4

• Contactor
• Surge protector

Rationale: Circuit breakers are designed to interrupt current in

overload or short circuit conditions to prevent damage and fire hazards.

• What is the purpose of a GFCI outlet?
• Increase voltage
• Prevent electrocution
• Reduce energy consumption
• Stabilize current

Rationale: Ground-Fault Circuit Interrupters (GFCI) detect current

leakage and trip to prevent shock hazards.

• What type of conduit is typically used outdoors and underground?

A) EMT

B) PVC

• Flexible metal conduit
• BX cable

Rationale: PVC conduit is corrosion-resistant and suitable for wet and

underground locations.

• How many wires are required in a 120/240V single-phase branch

circuit with a neutral?

• 2

B) 3 3 / 4

• 3 hot/neutral/ground
• 4

Rationale: A single-phase 120/240V circuit requires two hot wires, one

neutral, and typically a ground.

• What is the minimum burial depth for rigid metal conduit (RMC) under

residential driveways?

• 12 inches
• 18 inches
• 24 inches
• 6 inches

Rationale: NEC Table 300.5 specifies 6 inches minimum burial depth

for RMC under concrete driveways.

• Which type of load is considered continuous under NEC?
• Loads lasting less than 1 hour
• Loads fluctuating rapidly
• Loads expected to run for 3 hours or more
• Motor loads only

Rationale: NEC defines continuous load as a load expected to operate

for three hours or more.

• What color is typically used for a grounded (neutral) conductor?
• Black
• Red
• White
• / 4