Maine Journeyman Electrician Exam Verified
Questions, Correct Answers, and Detailed
Explanations for Science Students||Already
Graded A+
1. What is the maximum number of 20-ampere branch circuits that can be
installed in a standard 12-circuit, 120/240V panelboard?
A. 8
B. 12
C. 12
D. 20
Rationale: A 12-circuit panelboard can physically accommodate 12 branch
circuits, regardless of amperage.
2. What is the minimum conductor size allowed for a 30-amp branch circuit
supplying a general-purpose receptacle?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Rationale: NEC 310.15 and 210.21 require 10 AWG copper wire for a 30-amp
circuit.
3. According to the NEC, what is the required spacing for outlets in a dwelling
living room?
A. Every 12 feet
B. Every 12 feet along the wall
C. Every 15 feet along the wall
D. Every 6 feet
Rationale: NEC 210.52(A) requires receptacles along walls so that no point
along the floor line is more than 6 feet from an outlet, meaning outlets every
12 feet.
,4. What type of grounding is required for a metallic water pipe system?
A. Plastic conduit
B. Bonding to the electrical system ground
C. Separate grounding rod only
D. No grounding required
Rationale: NEC 250.104 requires metallic water piping systems to be bonded to
the electrical system grounding electrode.
5. What is the maximum voltage drop recommended for feeders and branch
circuits?
A. 3%
B. 5% total
C. 10%
D. 8%
Rationale: NEC Handbook recommends a maximum voltage drop of 3% for a
single run and 5% total for feeders and branch circuits to maintain efficiency.
6. Which device is designed to protect against ground faults?
A. Circuit breaker
B. Fuse
C. GFCI (Ground Fault Circuit Interrupter)
D. AFCI
Rationale: GFCIs detect leakage current to ground and trip the circuit,
protecting against shock.
7. What is the minimum height for mounting a receptacle in a kitchen
countertop area?
A. 36 inches
B. 12 inches
C. Above the countertop, typically 4 inches
D. 18 inches
, Rationale: NEC 210.52(C) requires receptacles to be installed above
countertops, generally 4 inches above.
8. Which conductor color is typically used for a grounded (neutral)
conductor?
A. Black
B. Red
C. White or gray
D. Green
Rationale: NEC 200.6 specifies white or gray for grounded (neutral) conductors.
9. What is the primary purpose of an AFCI breaker?
A. Overload protection
B. Preventing fires caused by arc faults
C. Ground fault protection
D. Voltage regulation
Rationale: AFCI breakers detect dangerous arcing conditions that can cause
fires in residential circuits.
10. Which of the following is the proper wiring method for exposed
residential branch circuits in unfinished basements?
A. NM cable in open air
B. MC or EMT conduit
C. UF cable buried in soil
D. AC cable in insulation
Rationale: NEC 334 and 338 require exposed conductors in unfinished
basements to be protected in conduit like EMT or MC.
11. What is the required minimum working space in front of an electrical
panel?
A. 24 inches
B. 30 inches
Questions, Correct Answers, and Detailed
Explanations for Science Students||Already
Graded A+
1. What is the maximum number of 20-ampere branch circuits that can be
installed in a standard 12-circuit, 120/240V panelboard?
A. 8
B. 12
C. 12
D. 20
Rationale: A 12-circuit panelboard can physically accommodate 12 branch
circuits, regardless of amperage.
2. What is the minimum conductor size allowed for a 30-amp branch circuit
supplying a general-purpose receptacle?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Rationale: NEC 310.15 and 210.21 require 10 AWG copper wire for a 30-amp
circuit.
3. According to the NEC, what is the required spacing for outlets in a dwelling
living room?
A. Every 12 feet
B. Every 12 feet along the wall
C. Every 15 feet along the wall
D. Every 6 feet
Rationale: NEC 210.52(A) requires receptacles along walls so that no point
along the floor line is more than 6 feet from an outlet, meaning outlets every
12 feet.
,4. What type of grounding is required for a metallic water pipe system?
A. Plastic conduit
B. Bonding to the electrical system ground
C. Separate grounding rod only
D. No grounding required
Rationale: NEC 250.104 requires metallic water piping systems to be bonded to
the electrical system grounding electrode.
5. What is the maximum voltage drop recommended for feeders and branch
circuits?
A. 3%
B. 5% total
C. 10%
D. 8%
Rationale: NEC Handbook recommends a maximum voltage drop of 3% for a
single run and 5% total for feeders and branch circuits to maintain efficiency.
6. Which device is designed to protect against ground faults?
A. Circuit breaker
B. Fuse
C. GFCI (Ground Fault Circuit Interrupter)
D. AFCI
Rationale: GFCIs detect leakage current to ground and trip the circuit,
protecting against shock.
7. What is the minimum height for mounting a receptacle in a kitchen
countertop area?
A. 36 inches
B. 12 inches
C. Above the countertop, typically 4 inches
D. 18 inches
, Rationale: NEC 210.52(C) requires receptacles to be installed above
countertops, generally 4 inches above.
8. Which conductor color is typically used for a grounded (neutral)
conductor?
A. Black
B. Red
C. White or gray
D. Green
Rationale: NEC 200.6 specifies white or gray for grounded (neutral) conductors.
9. What is the primary purpose of an AFCI breaker?
A. Overload protection
B. Preventing fires caused by arc faults
C. Ground fault protection
D. Voltage regulation
Rationale: AFCI breakers detect dangerous arcing conditions that can cause
fires in residential circuits.
10. Which of the following is the proper wiring method for exposed
residential branch circuits in unfinished basements?
A. NM cable in open air
B. MC or EMT conduit
C. UF cable buried in soil
D. AC cable in insulation
Rationale: NEC 334 and 338 require exposed conductors in unfinished
basements to be protected in conduit like EMT or MC.
11. What is the required minimum working space in front of an electrical
panel?
A. 24 inches
B. 30 inches
