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Exam Practice Questions And Correct
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1. A branch circuit supplies continuous lighting loads totaling 16 amperes.
What is the minimum ampere rating of the circuit conductors?
A. 15 A
B. 20 A
C. 16 A
D. 18 A
Rationale: NEC requires conductors supplying continuous loads to be sized
at not less than 125% of the continuous load. Sixteen amperes × 125%
equals 20 amperes.
2. What is the primary purpose of bonding electrical equipment?
A. Increase voltage
B. Reduce power consumption
C. Provide a low-impedance fault current path
D. Improve power factor
,Rationale: Bonding ensures conductive parts remain at the same electrical
potential and provides an effective path for fault current to facilitate
overcurrent device operation.
3. Which NEC chapter primarily covers wiring methods and materials?
A. Chapter 1
B. Chapter 2
C. Chapter 3
D. Chapter 5
Rationale: NEC Chapter 3 contains requirements for wiring methods,
conductors, raceways, cables, boxes, and related materials.
4. What is the maximum overcurrent protection permitted for a 14 AWG
copper conductor under normal conditions?
A. 15 A
B. 20 A
C. 25 A
D. 30 A
Rationale: NEC Table 240.4(D) limits 14 AWG copper conductors to 15-
ampere overcurrent protection in most installations.
5. A transformer has a primary voltage of 480 V and a secondary voltage
of 120 V. What is the turns ratio?
A. 1:2
B. 2:1
C. 4:1
D. 8:1
Rationale: Transformer voltage ratio equals turns ratio. Dividing 480 by
120 results in a 4:1 ratio.
, 6. What instrument is used to measure insulation resistance?
A. Clamp meter
B. Voltmeter
C. Ohmmeter
D. Megohmmeter
Rationale: A megohmmeter applies a higher test voltage and measures
insulation resistance in megohms.
7. How many current-carrying conductors are permitted in a raceway
before ampacity adjustment factors apply?
A. 2
B. 3
C. More than 3
D. More than 6
Rationale: NEC requires ampacity adjustment when more than three
current-carrying conductors are installed together in a raceway or cable.
8. What is the resistance of a 120-volt load drawing 10 amperes?
A. 8 Ω
B. 10 Ω
C. 12 Ω
D. 15 Ω
Rationale: Ohm's Law states resistance equals voltage divided by current.
120 ÷ 10 = 12 ohms.
9. Which conductor is intentionally connected to earth?
A. Equipment grounding conductor
B. Bonding jumper
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. A branch circuit supplies continuous lighting loads totaling 16 amperes.
What is the minimum ampere rating of the circuit conductors?
A. 15 A
B. 20 A
C. 16 A
D. 18 A
Rationale: NEC requires conductors supplying continuous loads to be sized
at not less than 125% of the continuous load. Sixteen amperes × 125%
equals 20 amperes.
2. What is the primary purpose of bonding electrical equipment?
A. Increase voltage
B. Reduce power consumption
C. Provide a low-impedance fault current path
D. Improve power factor
,Rationale: Bonding ensures conductive parts remain at the same electrical
potential and provides an effective path for fault current to facilitate
overcurrent device operation.
3. Which NEC chapter primarily covers wiring methods and materials?
A. Chapter 1
B. Chapter 2
C. Chapter 3
D. Chapter 5
Rationale: NEC Chapter 3 contains requirements for wiring methods,
conductors, raceways, cables, boxes, and related materials.
4. What is the maximum overcurrent protection permitted for a 14 AWG
copper conductor under normal conditions?
A. 15 A
B. 20 A
C. 25 A
D. 30 A
Rationale: NEC Table 240.4(D) limits 14 AWG copper conductors to 15-
ampere overcurrent protection in most installations.
5. A transformer has a primary voltage of 480 V and a secondary voltage
of 120 V. What is the turns ratio?
A. 1:2
B. 2:1
C. 4:1
D. 8:1
Rationale: Transformer voltage ratio equals turns ratio. Dividing 480 by
120 results in a 4:1 ratio.
, 6. What instrument is used to measure insulation resistance?
A. Clamp meter
B. Voltmeter
C. Ohmmeter
D. Megohmmeter
Rationale: A megohmmeter applies a higher test voltage and measures
insulation resistance in megohms.
7. How many current-carrying conductors are permitted in a raceway
before ampacity adjustment factors apply?
A. 2
B. 3
C. More than 3
D. More than 6
Rationale: NEC requires ampacity adjustment when more than three
current-carrying conductors are installed together in a raceway or cable.
8. What is the resistance of a 120-volt load drawing 10 amperes?
A. 8 Ω
B. 10 Ω
C. 12 Ω
D. 15 Ω
Rationale: Ohm's Law states resistance equals voltage divided by current.
120 ÷ 10 = 12 ohms.
9. Which conductor is intentionally connected to earth?
A. Equipment grounding conductor
B. Bonding jumper
