Page 1 of 38
25 May 2026
NCCER ELECTRICAL TEST EXAM LATEST 2026/2027
WITH 150 EXAM PRACTICE QUESTIONS AND
CORRECT ANSWERS/ ELECTRICAL NCCER
CERTIFICATION EXAM
1. Which Article of the NEC covers grounding?
A. Article 110
B. Article 210
C. Article 250 D. Article 300
✅ Correct Answer: C. Article 250
Rationale: NEC Article 250 covers grounding and bonding requirements for electrical systems.
2. Which of the following is a 90-degree explosion-proof fitting?
A. LB
B. LL
C. LR
D. GUAL
✅ Correct Answer: D. GUAL
Rationale: A GUAL fitting is a 90-degree explosion-proof conduit fitting used in hazardous locations.
3. What is a dropout plate?
A. A plate used to seal conduit
B. A grounding plate
C. A metal plate with a curved surface for cable to follow as it passes from the tray
D. A tray support bracket
✅ Correct Answer: C. A metal plate with a curved surface for cable to follow as it passes from the
tray
Rationale: Dropout plates protect cables from damage when exiting cable trays.
4. All of the following are common service voltages in the United States EXCEPT:
A. 120/240V single-phase
B. 120/208V 3-phase
C. 277/480V 3-phase
D. 372/575V 3-phase, 4-wire
✅ Correct Answer: D. 372/575V 3-phase, 4-wire
Rationale: 372/575V is not a standard U.S. service voltage configuration.
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25 May 2026
5. What does a GFCI breaker do?
A. Increases voltage
B. Grounds the circuit
C. Opens a circuit to prevent operation of an electrical device
D. Measures amperage
✅ Correct Answer: C. Opens a circuit to prevent operation of an electrical device
Rationale: A GFCI interrupts power when a ground fault is detected to protect people from shock.
6. What will happen when one or more coils in a winding are grounded?
A. Motor runs faster
B. Voltage increases
C. The motor will automatically blow fuses
D. Resistance decreases
✅ Correct Answer: C. The motor will automatically blow fuses
Rationale: A grounded winding causes excessive current flow, leading protective devices to open.
7. Eight incandescent lighting fixtures are to be installed. Each fixture is 120 volts with a 200-watt
lamp. What is the total connected load?
A. 10 amps
B. 11.5 amps
C. 13.3 amps
D. 16 amps
✅ Correct Answer: C. 13.3 amps
Rationale: Total watts = 8 × 200 = 1600W. Current = 1600 ÷ 120 = 13.3A.
8. The _____ must be grounded in a bussed gutter if used as the main service equipment.
A. Raceway
B. Cable tray
C. Ground rod
D. Neutral busbar
✅ Correct Answer: D. Neutral busbar
Rationale: The neutral busbar must be bonded and grounded at service equipment.
9. When wall mounting cable tray, ensure that:
A. The tray is painted
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25 May 2026
B. It is grounded first
C. The building structure is strong enough to support the tray system
D. It is installed vertically
✅ Correct Answer: C. The building structure is strong enough to support the tray system
Rationale: Proper structural support prevents tray failure and hazards.
10. The purpose of sealing cable ends when reels of cable are in storage is:
A. Prevent rust
B. Prevent sunlight damage
C. To keep moisture from creeping in
D. Keep cables flexible
✅ Correct Answer: C. To keep moisture from creeping in
Rationale: Moisture damages cable insulation and conductors.
11. The outer covering on liquid-tight flexible metal conduit is used for:
A. Grounding
B. Heat resistance
C. A moisture seal
D. UV protection
✅ Correct Answer: C. A moisture seal
Rationale: The outer jacket prevents moisture entry.
12. A good electrical connection should:
A. Be loose
B. Conduct heat
C. Be mechanically and electrically secure
D. Have high resistance
✅ Correct Answer: C. Be mechanically and electrically secure Rationale:
Secure connections prevent overheating and arcing.
13. The symbol normally used for duplex receptacles is:
A. Triangle
B. Square with X
C. Circle with two parallel lines drawn through it
D. Half-circle
✅ Correct Answer: C. Circle with two parallel lines drawn through it
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25 May 2026
Rationale: This is the standard electrical drawing symbol for a duplex receptacle.
14. Disconnecting means are covered in:
A. NEC Article 250
B. NEC Article 300
C. NEC Section 110-22
D. NEC Section 210
✅ Correct Answer: C. NEC Section 110-22
Rationale: NEC 110-22 covers identification of disconnecting means.
15. In relation to switches, the term “throw” refers to the:
A. Voltage rating
B. Number of poles
C. Number of internal operations that a switch can perform
D. Grounding method
✅ Correct Answer: C. Number of internal operations that a switch can perform Rationale:
Throw describes how many circuits a switch can connect.
16. A 3-phase, 4-wire, 480V service requires _____ current transformers.
A. 1
B. 2
C. 3
D. 4
✅ Correct Answer: C. 3
Rationale: One CT is required for each phase conductor.
17. Service conductors and equipment are covered in:
A. NEC Article 110
B. NEC Article 250
C. NEC Article 230 D. NEC Article 300
✅ Correct Answer: C. NEC Article 230
Rationale: NEC Article 230 covers services.
18. The NEC requires that all receptacles installed on 15-amp and 20-amp branch circuits be _____
receptacles.
A. Isolated
25 May 2026
NCCER ELECTRICAL TEST EXAM LATEST 2026/2027
WITH 150 EXAM PRACTICE QUESTIONS AND
CORRECT ANSWERS/ ELECTRICAL NCCER
CERTIFICATION EXAM
1. Which Article of the NEC covers grounding?
A. Article 110
B. Article 210
C. Article 250 D. Article 300
✅ Correct Answer: C. Article 250
Rationale: NEC Article 250 covers grounding and bonding requirements for electrical systems.
2. Which of the following is a 90-degree explosion-proof fitting?
A. LB
B. LL
C. LR
D. GUAL
✅ Correct Answer: D. GUAL
Rationale: A GUAL fitting is a 90-degree explosion-proof conduit fitting used in hazardous locations.
3. What is a dropout plate?
A. A plate used to seal conduit
B. A grounding plate
C. A metal plate with a curved surface for cable to follow as it passes from the tray
D. A tray support bracket
✅ Correct Answer: C. A metal plate with a curved surface for cable to follow as it passes from the
tray
Rationale: Dropout plates protect cables from damage when exiting cable trays.
4. All of the following are common service voltages in the United States EXCEPT:
A. 120/240V single-phase
B. 120/208V 3-phase
C. 277/480V 3-phase
D. 372/575V 3-phase, 4-wire
✅ Correct Answer: D. 372/575V 3-phase, 4-wire
Rationale: 372/575V is not a standard U.S. service voltage configuration.
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25 May 2026
5. What does a GFCI breaker do?
A. Increases voltage
B. Grounds the circuit
C. Opens a circuit to prevent operation of an electrical device
D. Measures amperage
✅ Correct Answer: C. Opens a circuit to prevent operation of an electrical device
Rationale: A GFCI interrupts power when a ground fault is detected to protect people from shock.
6. What will happen when one or more coils in a winding are grounded?
A. Motor runs faster
B. Voltage increases
C. The motor will automatically blow fuses
D. Resistance decreases
✅ Correct Answer: C. The motor will automatically blow fuses
Rationale: A grounded winding causes excessive current flow, leading protective devices to open.
7. Eight incandescent lighting fixtures are to be installed. Each fixture is 120 volts with a 200-watt
lamp. What is the total connected load?
A. 10 amps
B. 11.5 amps
C. 13.3 amps
D. 16 amps
✅ Correct Answer: C. 13.3 amps
Rationale: Total watts = 8 × 200 = 1600W. Current = 1600 ÷ 120 = 13.3A.
8. The _____ must be grounded in a bussed gutter if used as the main service equipment.
A. Raceway
B. Cable tray
C. Ground rod
D. Neutral busbar
✅ Correct Answer: D. Neutral busbar
Rationale: The neutral busbar must be bonded and grounded at service equipment.
9. When wall mounting cable tray, ensure that:
A. The tray is painted
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25 May 2026
B. It is grounded first
C. The building structure is strong enough to support the tray system
D. It is installed vertically
✅ Correct Answer: C. The building structure is strong enough to support the tray system
Rationale: Proper structural support prevents tray failure and hazards.
10. The purpose of sealing cable ends when reels of cable are in storage is:
A. Prevent rust
B. Prevent sunlight damage
C. To keep moisture from creeping in
D. Keep cables flexible
✅ Correct Answer: C. To keep moisture from creeping in
Rationale: Moisture damages cable insulation and conductors.
11. The outer covering on liquid-tight flexible metal conduit is used for:
A. Grounding
B. Heat resistance
C. A moisture seal
D. UV protection
✅ Correct Answer: C. A moisture seal
Rationale: The outer jacket prevents moisture entry.
12. A good electrical connection should:
A. Be loose
B. Conduct heat
C. Be mechanically and electrically secure
D. Have high resistance
✅ Correct Answer: C. Be mechanically and electrically secure Rationale:
Secure connections prevent overheating and arcing.
13. The symbol normally used for duplex receptacles is:
A. Triangle
B. Square with X
C. Circle with two parallel lines drawn through it
D. Half-circle
✅ Correct Answer: C. Circle with two parallel lines drawn through it
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25 May 2026
Rationale: This is the standard electrical drawing symbol for a duplex receptacle.
14. Disconnecting means are covered in:
A. NEC Article 250
B. NEC Article 300
C. NEC Section 110-22
D. NEC Section 210
✅ Correct Answer: C. NEC Section 110-22
Rationale: NEC 110-22 covers identification of disconnecting means.
15. In relation to switches, the term “throw” refers to the:
A. Voltage rating
B. Number of poles
C. Number of internal operations that a switch can perform
D. Grounding method
✅ Correct Answer: C. Number of internal operations that a switch can perform Rationale:
Throw describes how many circuits a switch can connect.
16. A 3-phase, 4-wire, 480V service requires _____ current transformers.
A. 1
B. 2
C. 3
D. 4
✅ Correct Answer: C. 3
Rationale: One CT is required for each phase conductor.
17. Service conductors and equipment are covered in:
A. NEC Article 110
B. NEC Article 250
C. NEC Article 230 D. NEC Article 300
✅ Correct Answer: C. NEC Article 230
Rationale: NEC Article 230 covers services.
18. The NEC requires that all receptacles installed on 15-amp and 20-amp branch circuits be _____
receptacles.
A. Isolated
