NCCER
Comprehensive Resource To Help You Ace 2026-2027
Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
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1. Which Article of the NEC covers grounding?
a. Article 110
b. Article 230
c. Article 250
d. Article 300
Correct Answer: c. Article 250
2. Which of the following is a 90-degree explosion-proof fitting?
a. GUAT
b. GUAL
c. LB
d. C
Correct Answer: b. GUAL
3. What is a dropout plate?
a. A plate used to support conduit runs
b. A metal plate used to cover cable tray joints
c. A metal plate with a curved surface for cable to follow as it passes from the tray
d. A grounding plate for cable trays
Correct Answer: c. A metal plate with a curved surface for cable to follow as it passes
from the tray
4. All of the following are common service voltages in the United States EXCEPT:
a. 120/240 V single-phase
b. 120/208 V 3-phase, 4-wire
c. 277/480 V 3-phase, 4-wire
, d. 372/575 V 3-phase, 4-wire
Correct Answer: d. 372/575 V 3-phase, 4-wire
5. What does a GFCI breaker do?
a. Increases circuit voltage
b. Regulates motor speed
c. Opens a circuit to prevent operation of an electrical device
d. Boosts current flow
Correct Answer: c. Opens a circuit to prevent operation of an electrical device
6. What will happen when one or more coils in a winding are grounded?
a. The motor runs faster
b. The motor automatically blows fuses
c. The motor becomes more efficient
d. The motor reverses direction
Correct Answer: b. The motor automatically blows fuses
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. 10.0 amps
b. 12.5 amps
c. 13.3 amps
d. 16.0 amps
Correct Answer: c. 13.3 amps
8. What must be grounded in a bussed gutter if it is used as the main service equipment?
a. Phase busbar
b. Equipment enclosure
c. Neutral busbar
d. Conduit body
Correct Answer: c. Neutral busbar
9. When wall mounting cable tray, what must be ensured?
a. The tray is painted
, b. The building structure is strong enough to support the tray system
c. The tray is grounded at one end only
d. The tray is installed vertically
Correct Answer: b. The building structure is strong enough to support the tray
system
10. What is the purpose of sealing cable ends when reels of cable are in storage?
a. To identify cable size
b. To prevent abrasion
c. To keep moisture from creeping in
d. To increase flexibility
Correct Answer: c. To keep moisture from creeping in
11. The outer covering on liquid-tight flexible metal conduit is used for:
a. Electrical insulation only
b. A moisture seal
c. Mechanical grounding
d. Voltage regulation
Correct Answer: b. A moisture seal
12. A good electrical connection should:
a. Be mechanically secure only
b. Be electrically secure only
c. Be mechanically and electrically secure
d. Have low mechanical strength
Correct Answer: c. Be mechanically and electrically secure
13. What symbol is normally used for a duplex receptacle?
a. Square with a diagonal line
b. Triangle with a circle
c. Circle with two parallel lines drawn through it
d. Circle with one line through it
Correct Answer: c. Circle with two parallel lines drawn through it
, 14. Disconnecting means are covered in:
a. NEC Article 250
b. NEC Section 110-22
c. NEC Article 300
d. NEC Section 430-52
Correct Answer: b. NEC Section 110-22
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. Current rating
Correct Answer: c. Number of internal operations that a switch can perform
16. A 3-phase, 4-wire, 480-volt service requires how many current transformers?
a. 1
b. 2
c. 3
d. 4
Correct Answer: c. 3
17. Service conductors and equipment are covered in:
a. NEC Article 110
b. NEC Article 230
c. NEC Article 250
d. NEC Article 300
Correct Answer: b. NEC Article 230
18. The NEC requires that all receptacles installed on 15-amp and 20-amp branch circuits be
what type of receptacles?
a. Tamper-resistant
b. Hospital grade
c. Grounding receptacles
d. Locking type
Correct Answer: c. Grounding receptacles
Comprehensive Resource To Help You Ace 2026-2027
Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
Instant Download Pdf
1. Which Article of the NEC covers grounding?
a. Article 110
b. Article 230
c. Article 250
d. Article 300
Correct Answer: c. Article 250
2. Which of the following is a 90-degree explosion-proof fitting?
a. GUAT
b. GUAL
c. LB
d. C
Correct Answer: b. GUAL
3. What is a dropout plate?
a. A plate used to support conduit runs
b. A metal plate used to cover cable tray joints
c. A metal plate with a curved surface for cable to follow as it passes from the tray
d. A grounding plate for cable trays
Correct Answer: c. A metal plate with a curved surface for cable to follow as it passes
from the tray
4. All of the following are common service voltages in the United States EXCEPT:
a. 120/240 V single-phase
b. 120/208 V 3-phase, 4-wire
c. 277/480 V 3-phase, 4-wire
, d. 372/575 V 3-phase, 4-wire
Correct Answer: d. 372/575 V 3-phase, 4-wire
5. What does a GFCI breaker do?
a. Increases circuit voltage
b. Regulates motor speed
c. Opens a circuit to prevent operation of an electrical device
d. Boosts current flow
Correct Answer: c. Opens a circuit to prevent operation of an electrical device
6. What will happen when one or more coils in a winding are grounded?
a. The motor runs faster
b. The motor automatically blows fuses
c. The motor becomes more efficient
d. The motor reverses direction
Correct Answer: b. The motor automatically blows fuses
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. 10.0 amps
b. 12.5 amps
c. 13.3 amps
d. 16.0 amps
Correct Answer: c. 13.3 amps
8. What must be grounded in a bussed gutter if it is used as the main service equipment?
a. Phase busbar
b. Equipment enclosure
c. Neutral busbar
d. Conduit body
Correct Answer: c. Neutral busbar
9. When wall mounting cable tray, what must be ensured?
a. The tray is painted
, b. The building structure is strong enough to support the tray system
c. The tray is grounded at one end only
d. The tray is installed vertically
Correct Answer: b. The building structure is strong enough to support the tray
system
10. What is the purpose of sealing cable ends when reels of cable are in storage?
a. To identify cable size
b. To prevent abrasion
c. To keep moisture from creeping in
d. To increase flexibility
Correct Answer: c. To keep moisture from creeping in
11. The outer covering on liquid-tight flexible metal conduit is used for:
a. Electrical insulation only
b. A moisture seal
c. Mechanical grounding
d. Voltage regulation
Correct Answer: b. A moisture seal
12. A good electrical connection should:
a. Be mechanically secure only
b. Be electrically secure only
c. Be mechanically and electrically secure
d. Have low mechanical strength
Correct Answer: c. Be mechanically and electrically secure
13. What symbol is normally used for a duplex receptacle?
a. Square with a diagonal line
b. Triangle with a circle
c. Circle with two parallel lines drawn through it
d. Circle with one line through it
Correct Answer: c. Circle with two parallel lines drawn through it
, 14. Disconnecting means are covered in:
a. NEC Article 250
b. NEC Section 110-22
c. NEC Article 300
d. NEC Section 430-52
Correct Answer: b. NEC Section 110-22
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. Current rating
Correct Answer: c. Number of internal operations that a switch can perform
16. A 3-phase, 4-wire, 480-volt service requires how many current transformers?
a. 1
b. 2
c. 3
d. 4
Correct Answer: c. 3
17. Service conductors and equipment are covered in:
a. NEC Article 110
b. NEC Article 230
c. NEC Article 250
d. NEC Article 300
Correct Answer: b. NEC Article 230
18. The NEC requires that all receptacles installed on 15-amp and 20-amp branch circuits be
what type of receptacles?
a. Tamper-resistant
b. Hospital grade
c. Grounding receptacles
d. Locking type
Correct Answer: c. Grounding receptacles
