TEXAS RESIDENTIAL WIREMAN LICENSE EXAMINATION
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR JUST RELEASED
Exam Coverage
1. Electrical Theory and Fundamentals – Understand voltage, current, resistance, power, Ohm's
Law, and AC/DC principles.
2. National Electrical Code (NEC) – Apply NEC requirements for residential wiring, installations,
and safety standards.
3. Branch Circuits and Feeders – Size conductors, overcurrent protection, and branch circuits
correctly.
4. Grounding and Bonding – Install grounding electrode systems and bonding methods according
to NEC.
5. Wiring Methods and Materials – Select approved wiring methods, raceways, cable types, and
installation practices.
6. Service Equipment – Install residential services, disconnects, load centres, and service
conductors safely.
7. Residential Electrical Installations – Install receptacles, switches, lighting outlets, appliances,
and special occupancies.
8. Electrical Safety – Follow OSHA safety principles, PPE requirements, lockout/tagout, and hazard
prevention.
9. Load Calculations – Calculate dwelling unit loads, demand factors, conductor sizes, and service
capacities.
10. Texas Licensing Laws and Best Practices – Understand state regulations, permits, inspections,
and professional responsibilities.
Texas Residential Wireman License Examination
Question 1
Which statement best describes the primary purpose of the National Electrical
Code when installing residential electrical systems?
A. To minimise construction costs only
B. To establish minimum requirements for safe electrical installations
,C. To increase electrical consumption
D. To replace local building codes entirely
Answer: B
Rationale: The NEC establishes minimum safety standards intended to protect
people and property from electrical hazards.
Question 2
According to Ohm's Law, when voltage remains constant and resistance increases,
what happens to the electrical current flowing through the circuit?
A. It increases significantly
B. It remains unchanged
C. It decreases proportionally
D. It doubles automatically
Answer: C
Rationale: Ohm's Law (I = V/R) shows that increasing resistance while voltage
remains constant causes current to decrease.
Question 3
Which conductor colour is generally recognised under the NEC as the grounded
(neutral) conductor in residential electrical installations?
A. Green
B. Bare copper
C. White or grey
,D. Red
Answer: C
Rationale: White or grey insulation identifies grounded neutral conductors under
NEC requirements.
Question 4
Why is equipment grounding considered an essential safety feature within
residential electrical systems installed according to the National Electrical Code?
A. It increases circuit voltage.
B. It provides a low-impedance path for fault current.
C. It eliminates overcurrent devices.
D. It reduces conductor size requirements.
Answer: B
Rationale: Equipment grounding provides a safe path for fault current, allowing
protective devices to operate quickly.
Question 5
Which overcurrent protective device is specifically designed to interrupt excessive
current caused by overloads and short circuits?
A. Disconnect switch
B. Circuit breaker
C. Junction box
D. Transformer
, Answer: B
Rationale: Circuit breakers protect conductors and equipment by interrupting
dangerous overcurrent conditions.
Question 6
What is the primary purpose of bonding metal electrical equipment together
throughout a residential electrical installation?
A. Increase voltage
B. Create parallel circuits
C. Maintain equal electrical potential and improve fault clearing
D. Reduce conductor resistance
Answer: C
Rationale: Bonding reduces shock hazards by maintaining conductive parts at the
same electrical potential.
Question 7
Which wiring method is most commonly used inside wood-frame residential
construction throughout Texas?
A. Armoured cable only
B. Nonmetallic-sheathed cable
C. Rigid metal conduit exclusively
D. Open knob-and-tube wiring
Answer: B
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR JUST RELEASED
Exam Coverage
1. Electrical Theory and Fundamentals – Understand voltage, current, resistance, power, Ohm's
Law, and AC/DC principles.
2. National Electrical Code (NEC) – Apply NEC requirements for residential wiring, installations,
and safety standards.
3. Branch Circuits and Feeders – Size conductors, overcurrent protection, and branch circuits
correctly.
4. Grounding and Bonding – Install grounding electrode systems and bonding methods according
to NEC.
5. Wiring Methods and Materials – Select approved wiring methods, raceways, cable types, and
installation practices.
6. Service Equipment – Install residential services, disconnects, load centres, and service
conductors safely.
7. Residential Electrical Installations – Install receptacles, switches, lighting outlets, appliances,
and special occupancies.
8. Electrical Safety – Follow OSHA safety principles, PPE requirements, lockout/tagout, and hazard
prevention.
9. Load Calculations – Calculate dwelling unit loads, demand factors, conductor sizes, and service
capacities.
10. Texas Licensing Laws and Best Practices – Understand state regulations, permits, inspections,
and professional responsibilities.
Texas Residential Wireman License Examination
Question 1
Which statement best describes the primary purpose of the National Electrical
Code when installing residential electrical systems?
A. To minimise construction costs only
B. To establish minimum requirements for safe electrical installations
,C. To increase electrical consumption
D. To replace local building codes entirely
Answer: B
Rationale: The NEC establishes minimum safety standards intended to protect
people and property from electrical hazards.
Question 2
According to Ohm's Law, when voltage remains constant and resistance increases,
what happens to the electrical current flowing through the circuit?
A. It increases significantly
B. It remains unchanged
C. It decreases proportionally
D. It doubles automatically
Answer: C
Rationale: Ohm's Law (I = V/R) shows that increasing resistance while voltage
remains constant causes current to decrease.
Question 3
Which conductor colour is generally recognised under the NEC as the grounded
(neutral) conductor in residential electrical installations?
A. Green
B. Bare copper
C. White or grey
,D. Red
Answer: C
Rationale: White or grey insulation identifies grounded neutral conductors under
NEC requirements.
Question 4
Why is equipment grounding considered an essential safety feature within
residential electrical systems installed according to the National Electrical Code?
A. It increases circuit voltage.
B. It provides a low-impedance path for fault current.
C. It eliminates overcurrent devices.
D. It reduces conductor size requirements.
Answer: B
Rationale: Equipment grounding provides a safe path for fault current, allowing
protective devices to operate quickly.
Question 5
Which overcurrent protective device is specifically designed to interrupt excessive
current caused by overloads and short circuits?
A. Disconnect switch
B. Circuit breaker
C. Junction box
D. Transformer
, Answer: B
Rationale: Circuit breakers protect conductors and equipment by interrupting
dangerous overcurrent conditions.
Question 6
What is the primary purpose of bonding metal electrical equipment together
throughout a residential electrical installation?
A. Increase voltage
B. Create parallel circuits
C. Maintain equal electrical potential and improve fault clearing
D. Reduce conductor resistance
Answer: C
Rationale: Bonding reduces shock hazards by maintaining conductive parts at the
same electrical potential.
Question 7
Which wiring method is most commonly used inside wood-frame residential
construction throughout Texas?
A. Armoured cable only
B. Nonmetallic-sheathed cable
C. Rigid metal conduit exclusively
D. Open knob-and-tube wiring
Answer: B
