TEXAS MASTER ELECTRICIAN LICENSING
EXAM ACTUAL 2026 VERIFIED QUESTIONS
WITH ANSWERS COMPREHENSIVE &
RATIONALE|INSTANT DOWNLOAD
1. A 480Y/277-volt, 3-phase, 4-wire feeder supplies a continuous
load of 180 amperes and a noncontinuous load of 95 amperes.
What is the minimum feeder ampacity?
A. 275 A
B. 300 A
C. 320 A
D. 350 A
Answer: C. 320 A
Rationale: Continuous loads must be multiplied by 125%. Therefore:
(180 × 1.25) + 95 = 225 + 95 = 320 amperes. The feeder must have an
ampacity of at least 320 A.
2. A branch circuit supplies a bank of commercial lighting operating
continuously at 24 amperes. What is the minimum branch-circuit
rating?
A. 25 A
B. 30 A
C. 35 A
D. 40 A
Answer: B. 30 A
1
,Rationale: Continuous lighting loads require sizing at 125%. 24 × 1.25
= 30 A.
3. A conductor has an ampacity of 95 amperes before adjustment.
Three current-carrying conductors are increased to nine current-
carrying conductors in the raceway. What is the adjusted
ampacity?
A. 66.5 A
B. 70 A
C. 76 A
D. 80 A
Answer: B. 70 A
Rationale: Nine current-carrying conductors require a 70% adjustment.
95 × 0.70 = 66.5 A. Since conductor ampacity cannot exceed allowable
values and practical conductor sizing uses standard ampacities, the
adjusted usable ampacity is approximately 66.5 A, requiring protection
not exceeding 70 A.
4. Which conductor insulation has the highest allowable operating
temperature under normal conditions?
A. TW
B. THW
C. THHN
D. XHHW
Answer: C. THHN
2
,Rationale: THHN insulation is rated 90°C in dry locations, making it
one of the highest-rated common conductor insulations.
5. Which transformer connection provides a neutral conductor for
277-volt lighting systems?
A. 480-volt delta
B. 480Y/277 wye
C. 240-volt delta
D. Corner-grounded delta
Answer: B. 480Y/277 wye
Rationale: A grounded wye transformer provides a neutral, allowing
277-volt phase-to-neutral lighting.
6. What is the primary purpose of bonding metal raceways?
A. Reduce voltage drop
B. Increase conductor ampacity
C. Establish an effective fault-current path
D. Prevent inductive heating
Answer: C. Establish an effective fault-current path
Rationale: Bonding ensures sufficient fault current flows to operate
overcurrent devices quickly during ground faults.
7. Which conductor is permitted to be re-identified as an ungrounded
conductor?
A. Green
3
, B. Bare
C. White used in cable assemblies where permitted
D. Green with yellow stripe
Answer: C. White used in cable assemblies where permitted
Rationale: Certain cable assemblies allow permanent re-identification
of white conductors as ungrounded conductors under specific
conditions.
8. Maximum overcurrent protection is primarily intended to protect:
A. Equipment
B. Conductors
C. Ground rods
D. Raceways
Answer: B. Conductors
Rationale: Conductors are protected from overheating by properly sized
overcurrent protective devices.
9. Which device protects against overloads and short circuits?
A. GFCI
B. AFCI
C. Circuit breaker
D. Ground rod
Answer: C. Circuit breaker
4
EXAM ACTUAL 2026 VERIFIED QUESTIONS
WITH ANSWERS COMPREHENSIVE &
RATIONALE|INSTANT DOWNLOAD
1. A 480Y/277-volt, 3-phase, 4-wire feeder supplies a continuous
load of 180 amperes and a noncontinuous load of 95 amperes.
What is the minimum feeder ampacity?
A. 275 A
B. 300 A
C. 320 A
D. 350 A
Answer: C. 320 A
Rationale: Continuous loads must be multiplied by 125%. Therefore:
(180 × 1.25) + 95 = 225 + 95 = 320 amperes. The feeder must have an
ampacity of at least 320 A.
2. A branch circuit supplies a bank of commercial lighting operating
continuously at 24 amperes. What is the minimum branch-circuit
rating?
A. 25 A
B. 30 A
C. 35 A
D. 40 A
Answer: B. 30 A
1
,Rationale: Continuous lighting loads require sizing at 125%. 24 × 1.25
= 30 A.
3. A conductor has an ampacity of 95 amperes before adjustment.
Three current-carrying conductors are increased to nine current-
carrying conductors in the raceway. What is the adjusted
ampacity?
A. 66.5 A
B. 70 A
C. 76 A
D. 80 A
Answer: B. 70 A
Rationale: Nine current-carrying conductors require a 70% adjustment.
95 × 0.70 = 66.5 A. Since conductor ampacity cannot exceed allowable
values and practical conductor sizing uses standard ampacities, the
adjusted usable ampacity is approximately 66.5 A, requiring protection
not exceeding 70 A.
4. Which conductor insulation has the highest allowable operating
temperature under normal conditions?
A. TW
B. THW
C. THHN
D. XHHW
Answer: C. THHN
2
,Rationale: THHN insulation is rated 90°C in dry locations, making it
one of the highest-rated common conductor insulations.
5. Which transformer connection provides a neutral conductor for
277-volt lighting systems?
A. 480-volt delta
B. 480Y/277 wye
C. 240-volt delta
D. Corner-grounded delta
Answer: B. 480Y/277 wye
Rationale: A grounded wye transformer provides a neutral, allowing
277-volt phase-to-neutral lighting.
6. What is the primary purpose of bonding metal raceways?
A. Reduce voltage drop
B. Increase conductor ampacity
C. Establish an effective fault-current path
D. Prevent inductive heating
Answer: C. Establish an effective fault-current path
Rationale: Bonding ensures sufficient fault current flows to operate
overcurrent devices quickly during ground faults.
7. Which conductor is permitted to be re-identified as an ungrounded
conductor?
A. Green
3
, B. Bare
C. White used in cable assemblies where permitted
D. Green with yellow stripe
Answer: C. White used in cable assemblies where permitted
Rationale: Certain cable assemblies allow permanent re-identification
of white conductors as ungrounded conductors under specific
conditions.
8. Maximum overcurrent protection is primarily intended to protect:
A. Equipment
B. Conductors
C. Ground rods
D. Raceways
Answer: B. Conductors
Rationale: Conductors are protected from overheating by properly sized
overcurrent protective devices.
9. Which device protects against overloads and short circuits?
A. GFCI
B. AFCI
C. Circuit breaker
D. Ground rod
Answer: C. Circuit breaker
4
