Texas Electrical Contractor Licensing
Examination — Limited Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of grounding an electrical system?
A. To increase current flow
B. To prevent electrical shock
C. To reduce voltage
D. To save energy
Rationale: Grounding provides a safe path for fault current to prevent
electrical shock.
2. The National Electrical Code (NEC) requires that all outlets in kitchens
be:
A. On a single circuit
, B. GFCI protected
C. 15-amp rated only
D. Installed 6 feet apart
Rationale: NEC mandates GFCI protection in kitchens to prevent shock
hazards near water.
3. What is the maximum allowable voltage drop for feeders according to
NEC recommendations?
A. 2%
B. 3%
C. 5%
D. 10%
Rationale: NEC recommends a maximum of 3% voltage drop for feeders to
maintain efficiency and proper equipment operation.
4. Which type of conduit is typically used outdoors and underground?
A. EMT
B. RMC
C. FMC
D. NM
Rationale: Rigid Metal Conduit (RMC) is durable and suitable for outdoor
and underground installations.
5. A 20-amp circuit breaker is protecting a 12 AWG copper conductor.
What is the maximum continuous load allowed?
, A. 12 amps
B. 16 amps
C. 18 amps
D. 20 amps
Rationale: NEC allows 80% of the breaker rating for continuous loads: 0.8 ×
20 A = 16 A.
6. What color is typically used for the grounded (neutral) conductor?
A. Black
B. Red
C. White
D. Green
Rationale: NEC specifies white or gray for grounded conductors.
7. The ampacity of a conductor is determined by:
A. Wire length only
B. Voltage only
C. Insulation type, temperature, and installation conditions
D. Conduit color
Rationale: Ampacity depends on insulation rating, ambient temperature,
and method of installation.
8. In a residential panel, the main bonding jumper connects:
A. Neutral to hot
B. Neutral to ground
, C. Hot to ground
D. Phase to phase
Rationale: The main bonding jumper connects neutral to the grounding
electrode to ensure fault clearing.
9. What is the minimum height for service entrance conductors above a
residential driveway?
A. 10 feet
B. 12 feet
C. 14 feet
D. 18 feet
Rationale: NEC requires at least 18 feet clearance above driveways for
safety.
10. Which device is used to protect circuits against overcurrent?
A. Fuse
B. Circuit breaker
C. Transformer
D. Ground rod
Rationale: Circuit breakers and fuses interrupt current flow during
overcurrent conditions.
11. The maximum distance a GFCI receptacle can protect
downstream devices is:
A. 10 feet
Examination — Limited Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of grounding an electrical system?
A. To increase current flow
B. To prevent electrical shock
C. To reduce voltage
D. To save energy
Rationale: Grounding provides a safe path for fault current to prevent
electrical shock.
2. The National Electrical Code (NEC) requires that all outlets in kitchens
be:
A. On a single circuit
, B. GFCI protected
C. 15-amp rated only
D. Installed 6 feet apart
Rationale: NEC mandates GFCI protection in kitchens to prevent shock
hazards near water.
3. What is the maximum allowable voltage drop for feeders according to
NEC recommendations?
A. 2%
B. 3%
C. 5%
D. 10%
Rationale: NEC recommends a maximum of 3% voltage drop for feeders to
maintain efficiency and proper equipment operation.
4. Which type of conduit is typically used outdoors and underground?
A. EMT
B. RMC
C. FMC
D. NM
Rationale: Rigid Metal Conduit (RMC) is durable and suitable for outdoor
and underground installations.
5. A 20-amp circuit breaker is protecting a 12 AWG copper conductor.
What is the maximum continuous load allowed?
, A. 12 amps
B. 16 amps
C. 18 amps
D. 20 amps
Rationale: NEC allows 80% of the breaker rating for continuous loads: 0.8 ×
20 A = 16 A.
6. What color is typically used for the grounded (neutral) conductor?
A. Black
B. Red
C. White
D. Green
Rationale: NEC specifies white or gray for grounded conductors.
7. The ampacity of a conductor is determined by:
A. Wire length only
B. Voltage only
C. Insulation type, temperature, and installation conditions
D. Conduit color
Rationale: Ampacity depends on insulation rating, ambient temperature,
and method of installation.
8. In a residential panel, the main bonding jumper connects:
A. Neutral to hot
B. Neutral to ground
, C. Hot to ground
D. Phase to phase
Rationale: The main bonding jumper connects neutral to the grounding
electrode to ensure fault clearing.
9. What is the minimum height for service entrance conductors above a
residential driveway?
A. 10 feet
B. 12 feet
C. 14 feet
D. 18 feet
Rationale: NEC requires at least 18 feet clearance above driveways for
safety.
10. Which device is used to protect circuits against overcurrent?
A. Fuse
B. Circuit breaker
C. Transformer
D. Ground rod
Rationale: Circuit breakers and fuses interrupt current flow during
overcurrent conditions.
11. The maximum distance a GFCI receptacle can protect
downstream devices is:
A. 10 feet
