TEXAS INDUSTRIAL ELECTRICIAN
CERTIFICATION EXAM ACTUAL 2026
VERIFIED QUESTIONS WITH ANSWERS
COMPREHENSIVE & RATIONALE|INSTANT
DOWNLOAD
1. In an industrial facility, a 480 V, 3-phase squirrel-cage induction
motor repeatedly trips its overload relay after operating for
approximately 15 minutes under normal mechanical load. Voltage
measurements indicate balanced line voltages, and insulation
resistance tests are satisfactory. Which condition is the MOST
likely cause?
A. Ground fault in stator winding
B. Improper overload relay setting below motor full-load current
C. Reverse phase rotation
D. Open neutral conductor
Answer: B. Improper overload relay setting below motor full-load
current
Rationale: Balanced voltage and good insulation indicate the motor
itself is likely healthy. Reverse rotation would affect direction but not
necessarily overload operation. An incorrectly adjusted overload relay
below the motor's nameplate full-load current causes nuisance tripping
after thermal accumulation.
2. Which National Electrical Code (NEC) principle BEST explains
why overcurrent protection does not necessarily protect motor
windings from overload?
A. Overcurrent devices respond only to phase imbalance.
1
,B. Branch-circuit protection primarily protects conductors against short
circuits and ground faults.
C. Circuit breakers sense insulation resistance.
D. Fuses regulate motor speed.
Answer: B. Branch-circuit protection primarily protects conductors
against short circuits and ground faults.
Rationale: Motor overload protection is separate from branch-circuit
short-circuit protection. Circuit breakers and fuses primarily protect
conductors, while overload relays protect motors from prolonged
excessive current.
3. A 75 HP, 460 V, three-phase induction motor has a measured
current significantly above nameplate value while delivering rated
load. Voltage is 440 V instead of 460 V. What is the MOST likely
explanation?
A. Lower voltage increases motor current.
B. Lower voltage decreases torque while decreasing current.
C. Lower voltage has no effect.
D. Lower voltage increases frequency.
Answer: A. Lower voltage increases motor current.
Rationale: When voltage decreases while load remains constant,
induction motors draw higher current to maintain required torque,
increasing heating and reducing efficiency.
4. What is the PRIMARY purpose of bonding metallic raceways in
an industrial electrical installation?
2
,A. Increase voltage
B. Improve lighting efficiency
C. Provide an effective fault-current path
D. Reduce transformer losses
Answer: C. Provide an effective fault-current path
Rationale: Bonding ensures sufficient fault current flows to rapidly
operate protective devices, minimizing shock hazards and equipment
damage.
5. Which transformer experiences the LOWEST losses at no load?
A. Copper losses
B. Eddy current losses
C. Core losses only
D. Load losses
Answer: C. Core losses only
Rationale: At no load, transformer current is minimal, making copper
losses negligible. Core losses (hysteresis and eddy currents) remain
because the core is energized.
6. An electrician measures 277 V from phase to neutral in a
480Y/277 V system. What is the expected phase-to-phase voltage?
A. 240 V
B. 277 V
C. 480 V
D. 600 V
3
, Answer: C. 480 V
Rationale: A 480Y/277 V system provides 277 V phase-to-neutral and
480 V phase-to-phase.
7. Which instrument is BEST suited for detecting intermittent loose
electrical connections inside energized switchgear?
A. Clamp meter
B. Megohmmeter
C. Infrared thermal camera
D. Continuity tester
Answer: C. Infrared thermal camera
Rationale: Thermal imaging identifies abnormal heating caused by
loose or high-resistance connections while equipment remains
energized.
8. Which OSHA principle requires workers to verify zero energy
after lockout/tagout?
A. Verification of isolation
B. Electrical permit
C. Job briefing
D. Voltage balancing
Answer: A. Verification of isolation
Rationale: Lockout/tagout procedures require verifying all hazardous
energy sources have been isolated before beginning work.
4
CERTIFICATION EXAM ACTUAL 2026
VERIFIED QUESTIONS WITH ANSWERS
COMPREHENSIVE & RATIONALE|INSTANT
DOWNLOAD
1. In an industrial facility, a 480 V, 3-phase squirrel-cage induction
motor repeatedly trips its overload relay after operating for
approximately 15 minutes under normal mechanical load. Voltage
measurements indicate balanced line voltages, and insulation
resistance tests are satisfactory. Which condition is the MOST
likely cause?
A. Ground fault in stator winding
B. Improper overload relay setting below motor full-load current
C. Reverse phase rotation
D. Open neutral conductor
Answer: B. Improper overload relay setting below motor full-load
current
Rationale: Balanced voltage and good insulation indicate the motor
itself is likely healthy. Reverse rotation would affect direction but not
necessarily overload operation. An incorrectly adjusted overload relay
below the motor's nameplate full-load current causes nuisance tripping
after thermal accumulation.
2. Which National Electrical Code (NEC) principle BEST explains
why overcurrent protection does not necessarily protect motor
windings from overload?
A. Overcurrent devices respond only to phase imbalance.
1
,B. Branch-circuit protection primarily protects conductors against short
circuits and ground faults.
C. Circuit breakers sense insulation resistance.
D. Fuses regulate motor speed.
Answer: B. Branch-circuit protection primarily protects conductors
against short circuits and ground faults.
Rationale: Motor overload protection is separate from branch-circuit
short-circuit protection. Circuit breakers and fuses primarily protect
conductors, while overload relays protect motors from prolonged
excessive current.
3. A 75 HP, 460 V, three-phase induction motor has a measured
current significantly above nameplate value while delivering rated
load. Voltage is 440 V instead of 460 V. What is the MOST likely
explanation?
A. Lower voltage increases motor current.
B. Lower voltage decreases torque while decreasing current.
C. Lower voltage has no effect.
D. Lower voltage increases frequency.
Answer: A. Lower voltage increases motor current.
Rationale: When voltage decreases while load remains constant,
induction motors draw higher current to maintain required torque,
increasing heating and reducing efficiency.
4. What is the PRIMARY purpose of bonding metallic raceways in
an industrial electrical installation?
2
,A. Increase voltage
B. Improve lighting efficiency
C. Provide an effective fault-current path
D. Reduce transformer losses
Answer: C. Provide an effective fault-current path
Rationale: Bonding ensures sufficient fault current flows to rapidly
operate protective devices, minimizing shock hazards and equipment
damage.
5. Which transformer experiences the LOWEST losses at no load?
A. Copper losses
B. Eddy current losses
C. Core losses only
D. Load losses
Answer: C. Core losses only
Rationale: At no load, transformer current is minimal, making copper
losses negligible. Core losses (hysteresis and eddy currents) remain
because the core is energized.
6. An electrician measures 277 V from phase to neutral in a
480Y/277 V system. What is the expected phase-to-phase voltage?
A. 240 V
B. 277 V
C. 480 V
D. 600 V
3
, Answer: C. 480 V
Rationale: A 480Y/277 V system provides 277 V phase-to-neutral and
480 V phase-to-phase.
7. Which instrument is BEST suited for detecting intermittent loose
electrical connections inside energized switchgear?
A. Clamp meter
B. Megohmmeter
C. Infrared thermal camera
D. Continuity tester
Answer: C. Infrared thermal camera
Rationale: Thermal imaging identifies abnormal heating caused by
loose or high-resistance connections while equipment remains
energized.
8. Which OSHA principle requires workers to verify zero energy
after lockout/tagout?
A. Verification of isolation
B. Electrical permit
C. Job briefing
D. Voltage balancing
Answer: A. Verification of isolation
Rationale: Lockout/tagout procedures require verifying all hazardous
energy sources have been isolated before beginning work.
4
