TEXAS ELECTRICAL CONTRACTOR EXAM 100 COMPLETE
QUESTIONS AND ANSWERS | CONTENT WELL
ORGANIZED 2026/2027 NEWTEST UPDATE | 100 %
RATED AND VERIFIED SOLUTIONS | GET AN A+ NEW
VERSION!!! INSTANT PDF
MOST TESTED TOPICS: NATIONAL ELECTRICAL CODE, GROUNDING AND BONDING,
OVERCURRENT PROTECTION, CONDUCTOR SIZING, BOX FILL CALCULATIONS,
MOTOR INSTALLATIONS, TRANSFORMERS, SERVICE ENTRANCE, LOAD
CALCULATIONS, SAFETY AND OSHA
1. A feeder supplies a continuous load of 80A. What is the minimum ampacity
required for the conductor?
A. 80A
B. 90A
C. 100A
D. 125A
Answer: C. 100A
Continuous loads must be sized at 125%, so 80 × 1.25 = 100A.
2. What is the minimum burial depth for rigid metal conduit under a
residential driveway?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: C. 18 inches
NEC requires 18 inches for RMC under driveways.
3. A 20A circuit uses #12 copper conductors. What is the maximum continuous
load?
A. 16A
, B. 18A
C. 20A
D. 25A
Answer: A. 16A
80% rule applies for continuous loads: 20 × 0.8 = 16A.
4. What is required for bonding metal water piping systems?
A. Only grounding electrode
B. Bonding jumper
C. Insulated conductor
D. Neutral conductor
Answer: B. Bonding jumper
Bonding jumper ensures continuity and fault current path.
5. What is the maximum number of #12 conductors in a 4-inch square box (2-
1/8 deep)?
A. 9
B. 12
C. 16
D. 21
Answer: D. 21
Box fill volume allows up to 21 conductors.
6. What is the purpose of a grounding electrode conductor?
A. Carry load current
B. Connect neutral to ground
C. Connect system to earth
D. Protect appliances
Answer: C. Connect system to earth
It stabilizes voltage and provides reference to earth.
7. What is the ampacity of #10 copper THHN at 75°C?
A. 20A
B. 30A
C. 35A
, D. 40A
Answer: C. 35A
From NEC ampacity tables.
8. What type of breaker is required for dwelling bedroom circuits?
A. GFCI
B. AFCI
C. Standard
D. Dual element
Answer: B. AFCI
AFCI protects against arc faults.
9. A 240V motor draws 40A. What size breaker is allowed (inverse time)?
A. 40A
B. 50A
C. 60A
D. 70A
Answer: C. 60A
Motor circuits can be sized up to 250% for breakers.
10.What is the minimum conductor size for a 200A residential service?
A. #2 copper
B. #1 copper
C. 2/0 copper
D. 3/0 copper
Answer: C. 2/0 copper
Standard NEC requirement for 200A service.
11.What is the required working space depth for equipment over 150V to
ground?
A. 24 inches
B. 30 inches
C. 36 inches
D. 42 inches
QUESTIONS AND ANSWERS | CONTENT WELL
ORGANIZED 2026/2027 NEWTEST UPDATE | 100 %
RATED AND VERIFIED SOLUTIONS | GET AN A+ NEW
VERSION!!! INSTANT PDF
MOST TESTED TOPICS: NATIONAL ELECTRICAL CODE, GROUNDING AND BONDING,
OVERCURRENT PROTECTION, CONDUCTOR SIZING, BOX FILL CALCULATIONS,
MOTOR INSTALLATIONS, TRANSFORMERS, SERVICE ENTRANCE, LOAD
CALCULATIONS, SAFETY AND OSHA
1. A feeder supplies a continuous load of 80A. What is the minimum ampacity
required for the conductor?
A. 80A
B. 90A
C. 100A
D. 125A
Answer: C. 100A
Continuous loads must be sized at 125%, so 80 × 1.25 = 100A.
2. What is the minimum burial depth for rigid metal conduit under a
residential driveway?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: C. 18 inches
NEC requires 18 inches for RMC under driveways.
3. A 20A circuit uses #12 copper conductors. What is the maximum continuous
load?
A. 16A
, B. 18A
C. 20A
D. 25A
Answer: A. 16A
80% rule applies for continuous loads: 20 × 0.8 = 16A.
4. What is required for bonding metal water piping systems?
A. Only grounding electrode
B. Bonding jumper
C. Insulated conductor
D. Neutral conductor
Answer: B. Bonding jumper
Bonding jumper ensures continuity and fault current path.
5. What is the maximum number of #12 conductors in a 4-inch square box (2-
1/8 deep)?
A. 9
B. 12
C. 16
D. 21
Answer: D. 21
Box fill volume allows up to 21 conductors.
6. What is the purpose of a grounding electrode conductor?
A. Carry load current
B. Connect neutral to ground
C. Connect system to earth
D. Protect appliances
Answer: C. Connect system to earth
It stabilizes voltage and provides reference to earth.
7. What is the ampacity of #10 copper THHN at 75°C?
A. 20A
B. 30A
C. 35A
, D. 40A
Answer: C. 35A
From NEC ampacity tables.
8. What type of breaker is required for dwelling bedroom circuits?
A. GFCI
B. AFCI
C. Standard
D. Dual element
Answer: B. AFCI
AFCI protects against arc faults.
9. A 240V motor draws 40A. What size breaker is allowed (inverse time)?
A. 40A
B. 50A
C. 60A
D. 70A
Answer: C. 60A
Motor circuits can be sized up to 250% for breakers.
10.What is the minimum conductor size for a 200A residential service?
A. #2 copper
B. #1 copper
C. 2/0 copper
D. 3/0 copper
Answer: C. 2/0 copper
Standard NEC requirement for 200A service.
11.What is the required working space depth for equipment over 150V to
ground?
A. 24 inches
B. 30 inches
C. 36 inches
D. 42 inches
