THE ELECTRICAL NCCER TEST QUESTIONS AND CORRECT ANSWERS (LATEST 2025
/ 2026) (A+ GUARANTEE)
1. Which Article of the NEC covers grounding? - ✔ANSWER article 250
2. What NEC table indicates the size of service conductors? - ✔ANSWER Table 310-16
3. The force that causes electrons to flow is most commonly called - ✔ANSWER Voltage
4. What instrument is used to measure CURRENT? - ✔ANSWER Ammeter
5. What are the 3 elements in every electrical circuit? - ✔ANSWER Power source,
switch, and load
6. How does a battery produce voltage? - ✔ANSWER Chemical reaction
7. What type of NEMA class enclosure is approved for general purpose indoor use and is
NOT dust-tight or drip-proof? - ✔ANSWER Types 1
8. If a voltage source of a circuit provides 240 volts and there are 5 ohms of resistance, how
much current is in the circuit? - ✔ANSWER 40 amps
9. An analog voltmeter is being connected to a 24 V DC circuit. Polarity is reversed. What
reading will occur? - ✔ANSWER O or fewer volts
10. How should power cable and signal cable be placed in the same cable tray? - ✔ANSWER
Place a divider between the signal cables and the power cable
,11. What are the 2 MOST commonly used methods of terminating grounding? - ✔ANSWER
Exothermic (Cadwelding) and mechanical
12. Copper is the most widely used conductor because it. - ✔ANSWER Offers low
resistance and is easy to use
13. Which of the following is a 90 degree, explosion proof fitting? - ✔ANSWER GUAL
14. What is a dropout plate? - ✔ANSWER Metal plate with a curved surface for cable to
follow as it passes from the tray
15. All of the following are common service voltages in the United States EXCEPT: -
✔ANSWER 372/575 3-PHASE, 4-WIRE
16. What does a GFCI breaker do? - ✔ANSWER Opens a circuit to prevent operation of
an electrical device
17. What will happen when one or more coils in a winding are grounded? - ✔ANSWER
The motor will automatically blow fuses
18. Eight incandescent lighting fixtures are to be installed. Each fixture is 120- volts, with a
200-watt lamp. What is the total connected load? - ✔ANSWER 13.3 amps
19. The must be grounded in a bussed gutter if used as the main service equipment. -
✔ANSWER Neutral busbar
20. When wall mounting cable tray, ensure that - ✔ANSWER The building structure is
strong enough to support the tray system
, 21. The purpose of sealing cable ends when reels of cable are in storage is - ✔ANSWER
To keep moisture from creeping in
22. The outer covering on liguid-tight flexible metal conduit is used for - ✔ANSWER A
moisture seal
23. A good electrical connection should - ✔ANSWER Be mechanically and electrically
secure
24. The symbol normally used for duplex - ✔ANSWER Circle with two parallel lines
drawb through it
25. Disconnecting means are covered in - ✔ANSWER NEC Section 110-22
26. In relation to switches, the term throw refers to the - ✔ANSWER Number of internal
operations that a switch can perform
27. A 3-phase, 4-wire, 480v service requires ______ current transformer(s) - ✔ANSWER
3
28. Services conductors and equipment are covered in - ✔ANSWER NEC Article 230
29. The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits be
______ receptacles - ✔ANSWER Grounding
30. A transformer with the primary of 400 turns and a secondary of 300 turns has a _____ -
✔ANSWER Step-down turns ratio of 4:3
31. The circular mil is based on the - ✔ANSWER Cross-sectional area of the wire
/ 2026) (A+ GUARANTEE)
1. Which Article of the NEC covers grounding? - ✔ANSWER article 250
2. What NEC table indicates the size of service conductors? - ✔ANSWER Table 310-16
3. The force that causes electrons to flow is most commonly called - ✔ANSWER Voltage
4. What instrument is used to measure CURRENT? - ✔ANSWER Ammeter
5. What are the 3 elements in every electrical circuit? - ✔ANSWER Power source,
switch, and load
6. How does a battery produce voltage? - ✔ANSWER Chemical reaction
7. What type of NEMA class enclosure is approved for general purpose indoor use and is
NOT dust-tight or drip-proof? - ✔ANSWER Types 1
8. If a voltage source of a circuit provides 240 volts and there are 5 ohms of resistance, how
much current is in the circuit? - ✔ANSWER 40 amps
9. An analog voltmeter is being connected to a 24 V DC circuit. Polarity is reversed. What
reading will occur? - ✔ANSWER O or fewer volts
10. How should power cable and signal cable be placed in the same cable tray? - ✔ANSWER
Place a divider between the signal cables and the power cable
,11. What are the 2 MOST commonly used methods of terminating grounding? - ✔ANSWER
Exothermic (Cadwelding) and mechanical
12. Copper is the most widely used conductor because it. - ✔ANSWER Offers low
resistance and is easy to use
13. Which of the following is a 90 degree, explosion proof fitting? - ✔ANSWER GUAL
14. What is a dropout plate? - ✔ANSWER Metal plate with a curved surface for cable to
follow as it passes from the tray
15. All of the following are common service voltages in the United States EXCEPT: -
✔ANSWER 372/575 3-PHASE, 4-WIRE
16. What does a GFCI breaker do? - ✔ANSWER Opens a circuit to prevent operation of
an electrical device
17. What will happen when one or more coils in a winding are grounded? - ✔ANSWER
The motor will automatically blow fuses
18. Eight incandescent lighting fixtures are to be installed. Each fixture is 120- volts, with a
200-watt lamp. What is the total connected load? - ✔ANSWER 13.3 amps
19. The must be grounded in a bussed gutter if used as the main service equipment. -
✔ANSWER Neutral busbar
20. When wall mounting cable tray, ensure that - ✔ANSWER The building structure is
strong enough to support the tray system
, 21. The purpose of sealing cable ends when reels of cable are in storage is - ✔ANSWER
To keep moisture from creeping in
22. The outer covering on liguid-tight flexible metal conduit is used for - ✔ANSWER A
moisture seal
23. A good electrical connection should - ✔ANSWER Be mechanically and electrically
secure
24. The symbol normally used for duplex - ✔ANSWER Circle with two parallel lines
drawb through it
25. Disconnecting means are covered in - ✔ANSWER NEC Section 110-22
26. In relation to switches, the term throw refers to the - ✔ANSWER Number of internal
operations that a switch can perform
27. A 3-phase, 4-wire, 480v service requires ______ current transformer(s) - ✔ANSWER
3
28. Services conductors and equipment are covered in - ✔ANSWER NEC Article 230
29. The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits be
______ receptacles - ✔ANSWER Grounding
30. A transformer with the primary of 400 turns and a secondary of 300 turns has a _____ -
✔ANSWER Step-down turns ratio of 4:3
31. The circular mil is based on the - ✔ANSWER Cross-sectional area of the wire
