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Texas Residential Wireman
Examination Practice Exam 2026 | 100
Questions & Answers with Detailed
Rationales | Complete Exam Prep &
Study Guide
1. What is the primary purpose of the National Electrical Code (NEC)?
A. Reduce construction costs
B. Improve energy efficiency
C. Provide minimum safety standards for electrical installations
D. Replace local building codes
Rationale: The NEC establishes minimum requirements for safe electrical
installations to protect people and property from electrical hazards.
2. What is the minimum working space depth required in front of most
electrical panels operating at 150 volts to ground?
A. 24 inches
B. 36 inches
C. 42 inches
D. 48 inches
Rationale: NEC 110.26 generally requires 36 inches of clear working depth for
equipment operating at 150 volts or less to ground.
, 3. Which conductor is typically identified by white insulation?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Grounded (neutral) conductor
D. Traveler conductor
Rationale: White or gray insulation identifies the grounded (neutral) conductor
under NEC requirements.
4. Which conductor is permitted to be bare?
A. Neutral conductor
B. Hot conductor
C. Traveler conductor
D. Equipment grounding conductor
Rationale: Equipment grounding conductors may be bare, green, or green with
yellow stripes.
5. What device protects people from electric shock by detecting ground
faults?
A. AFCI
B. Circuit breaker
C. Fuse
D. GFCI
Rationale: Ground-Fault Circuit Interrupters open the circuit when ground-fault
current exceeds approximately 4–6 milliamperes.
6. Which rooms in a dwelling generally require GFCI protection?
A. Bedrooms
B. Living rooms
C. Bathrooms
D. Dining rooms
Rationale: Bathroom receptacles are required to have GFCI protection.
, 7. What is the primary purpose of an AFCI?
A. Prevent overloads
B. Protect motors
C. Reduce fire hazards caused by arcing faults
D. Increase voltage
Rationale: Arc-Fault Circuit Interrupters detect dangerous arcing conditions that
could start electrical fires.
8. Which NEC chapter contains general requirements?
A. Chapter 5
B. Chapter 7
C. Chapter 1
D. Chapter 9
Rationale: Chapter 1 provides general requirements applicable throughout the
NEC.
9. What does AWG stand for?
A. American Wire Guide
B. American Wire Gauge
C. Approved Wiring Grade
D. Alternating Wire Group
Rationale: AWG is the standardized wire sizing system used in North America.
10.Which wire size has the lowest electrical resistance?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Rationale: Larger conductors have lower resistance than smaller conductors.
11.Copper conductors generally have what advantage over aluminum
conductors?
A. Lower cost
Texas Residential Wireman
Examination Practice Exam 2026 | 100
Questions & Answers with Detailed
Rationales | Complete Exam Prep &
Study Guide
1. What is the primary purpose of the National Electrical Code (NEC)?
A. Reduce construction costs
B. Improve energy efficiency
C. Provide minimum safety standards for electrical installations
D. Replace local building codes
Rationale: The NEC establishes minimum requirements for safe electrical
installations to protect people and property from electrical hazards.
2. What is the minimum working space depth required in front of most
electrical panels operating at 150 volts to ground?
A. 24 inches
B. 36 inches
C. 42 inches
D. 48 inches
Rationale: NEC 110.26 generally requires 36 inches of clear working depth for
equipment operating at 150 volts or less to ground.
, 3. Which conductor is typically identified by white insulation?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Grounded (neutral) conductor
D. Traveler conductor
Rationale: White or gray insulation identifies the grounded (neutral) conductor
under NEC requirements.
4. Which conductor is permitted to be bare?
A. Neutral conductor
B. Hot conductor
C. Traveler conductor
D. Equipment grounding conductor
Rationale: Equipment grounding conductors may be bare, green, or green with
yellow stripes.
5. What device protects people from electric shock by detecting ground
faults?
A. AFCI
B. Circuit breaker
C. Fuse
D. GFCI
Rationale: Ground-Fault Circuit Interrupters open the circuit when ground-fault
current exceeds approximately 4–6 milliamperes.
6. Which rooms in a dwelling generally require GFCI protection?
A. Bedrooms
B. Living rooms
C. Bathrooms
D. Dining rooms
Rationale: Bathroom receptacles are required to have GFCI protection.
, 7. What is the primary purpose of an AFCI?
A. Prevent overloads
B. Protect motors
C. Reduce fire hazards caused by arcing faults
D. Increase voltage
Rationale: Arc-Fault Circuit Interrupters detect dangerous arcing conditions that
could start electrical fires.
8. Which NEC chapter contains general requirements?
A. Chapter 5
B. Chapter 7
C. Chapter 1
D. Chapter 9
Rationale: Chapter 1 provides general requirements applicable throughout the
NEC.
9. What does AWG stand for?
A. American Wire Guide
B. American Wire Gauge
C. Approved Wiring Grade
D. Alternating Wire Group
Rationale: AWG is the standardized wire sizing system used in North America.
10.Which wire size has the lowest electrical resistance?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Rationale: Larger conductors have lower resistance than smaller conductors.
11.Copper conductors generally have what advantage over aluminum
conductors?
A. Lower cost
