Wisconsin Electrical Contractor
Examination Questions and Correct
Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
1. Which National Electrical Code (NEC) article primarily covers
general requirements for electrical installations?
A. Article 90
B. Article 100
C. Article 110
D. Article 200
Answer: C. Article 110
Rationale: NEC Article 110 contains general requirements for electrical
installations, including examination, identification, installation, and
termination requirements. Article 90 provides the purpose, scope, and
general organization of the NEC, while Article 100 contains definitions.
, 2. What is the primary purpose of overcurrent protection in an
electrical circuit?
A. To increase circuit voltage
B. To protect conductors and equipment from excessive current
C. To improve power factor
D. To eliminate voltage drop
Answer: B. To protect conductors and equipment from excessive
current
Rationale: Overcurrent protection is intended to protect conductors and
electrical equipment from damage caused by excessive current resulting
from overloads, short circuits, or ground faults. Properly selected
overcurrent devices interrupt the circuit before dangerous heating
occurs.
3. Under the NEC, which conductor is normally identified by a
continuous white or gray outer finish?
A. Ungrounded conductor
B. Grounding electrode conductor
C. Grounded conductor
D. Equipment grounding conductor
,Answer: C. Grounded conductor
Rationale: The grounded circuit conductor, commonly called the neutral
conductor, is generally identified by a continuous white or gray covering
or by other permitted identification methods. Ungrounded conductors
are typically identified by colors other than white, gray, or green.
4. What is the standard voltage between the ungrounded
conductors of a typical single-phase 120/240-volt residential
service?
A. 120 volts
B. 208 volts
C. 240 volts
D. 480 volts
Answer: C. 240 volts
Rationale: A typical single-phase residential service has two ungrounded
conductors with 120 volts from each ungrounded conductor to the
neutral. The voltage measured between the two ungrounded
conductors is 240 volts.
5. Which NEC article covers grounding and bonding?
, A. Article 210
B. Article 220
C. Article 250
D. Article 300
Answer: C. Article 250
Rationale: NEC Article 250 contains the primary requirements for
grounding and bonding electrical systems and equipment. It addresses
system grounding, equipment grounding, bonding, grounding electrode
conductors, and related requirements.
6. What is the purpose of an equipment grounding conductor?
A. To carry normal load current
B. To provide a low-impedance path for fault current
C. To increase circuit voltage
D. To reduce the normal operating current
Answer: B. To provide a low-impedance path for fault current
Rationale: The equipment grounding conductor provides a conductive
path for fault current back toward the source so that the overcurrent
protective device can operate promptly. It is not intended to carry
normal circuit current.
Examination Questions and Correct
Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
1. Which National Electrical Code (NEC) article primarily covers
general requirements for electrical installations?
A. Article 90
B. Article 100
C. Article 110
D. Article 200
Answer: C. Article 110
Rationale: NEC Article 110 contains general requirements for electrical
installations, including examination, identification, installation, and
termination requirements. Article 90 provides the purpose, scope, and
general organization of the NEC, while Article 100 contains definitions.
, 2. What is the primary purpose of overcurrent protection in an
electrical circuit?
A. To increase circuit voltage
B. To protect conductors and equipment from excessive current
C. To improve power factor
D. To eliminate voltage drop
Answer: B. To protect conductors and equipment from excessive
current
Rationale: Overcurrent protection is intended to protect conductors and
electrical equipment from damage caused by excessive current resulting
from overloads, short circuits, or ground faults. Properly selected
overcurrent devices interrupt the circuit before dangerous heating
occurs.
3. Under the NEC, which conductor is normally identified by a
continuous white or gray outer finish?
A. Ungrounded conductor
B. Grounding electrode conductor
C. Grounded conductor
D. Equipment grounding conductor
,Answer: C. Grounded conductor
Rationale: The grounded circuit conductor, commonly called the neutral
conductor, is generally identified by a continuous white or gray covering
or by other permitted identification methods. Ungrounded conductors
are typically identified by colors other than white, gray, or green.
4. What is the standard voltage between the ungrounded
conductors of a typical single-phase 120/240-volt residential
service?
A. 120 volts
B. 208 volts
C. 240 volts
D. 480 volts
Answer: C. 240 volts
Rationale: A typical single-phase residential service has two ungrounded
conductors with 120 volts from each ungrounded conductor to the
neutral. The voltage measured between the two ungrounded
conductors is 240 volts.
5. Which NEC article covers grounding and bonding?
, A. Article 210
B. Article 220
C. Article 250
D. Article 300
Answer: C. Article 250
Rationale: NEC Article 250 contains the primary requirements for
grounding and bonding electrical systems and equipment. It addresses
system grounding, equipment grounding, bonding, grounding electrode
conductors, and related requirements.
6. What is the purpose of an equipment grounding conductor?
A. To carry normal load current
B. To provide a low-impedance path for fault current
C. To increase circuit voltage
D. To reduce the normal operating current
Answer: B. To provide a low-impedance path for fault current
Rationale: The equipment grounding conductor provides a conductive
path for fault current back toward the source so that the overcurrent
protective device can operate promptly. It is not intended to carry
normal circuit current.
