TEXAS MASTER ELECTRICIAN 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 (NEC) interpretation
Load calculations and demand factors
Grounding and bonding
Overcurrent protection
Wiring methods and materials
Motors and controls
Transformers
Special occupancies and equipment
1. A continuous load is defined by the NEC as a load where the maximum
current is expected to continue for how long?
A. 1 hour
B. 2 hours
C. 3 hours
D. 4 hours
Answer: C. 3 hours
Continuous loads are defined in NEC Article 100 as loads expected to run for
3 hours or more, requiring sizing at 125%.
2. What is the minimum conductor size permitted for a 20-amp branch circuit
supplying general-use receptacles?
A. 14 AWG
B. 12 AWG
, C. 10 AWG
D. 8 AWG
Answer: B. 12 AWG
NEC Table 310.16 and 240.4(D) specify 12 AWG copper as minimum for 20-
amp circuits.
3. What is the maximum number of 90°C conductors allowed in a conduit
before ampacity adjustment is required?
A. 2
B. 3
C. 4
D. 6
Answer: C. 4
Adjustment factors apply when more than three current-carrying
conductors are installed together.
4. What is the minimum depth for direct burial of residential branch circuits
rated 120V with GFCI protection?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: B. 12 inches
NEC Table 300.5 allows reduced depth for GFCI-protected circuits.
5. A feeder supplying a panelboard must be protected by what type of device?
A. Ground-fault relay
B. Overcurrent device
C. Surge protector
D. Disconnect switch only
Answer: B. Overcurrent device
Feeders must be protected against overcurrent per NEC Article 215.
6. What is the minimum working clearance in front of electrical equipment
operating at 120–250 volts?
, A. 24 inches
B. 30 inches
C. 36 inches
D. 48 inches
Answer: C. 36 inches
NEC 110.26 requires 3 feet clearance for typical systems.
7. What is the purpose of bonding in electrical systems?
A. Increase voltage
B. Reduce current flow
C. Ensure electrical continuity
D. Limit load demand
Answer: C. Ensure electrical continuity
Bonding connects conductive parts to maintain a safe fault path.
8. What NEC article covers grounding and bonding requirements?
A. Article 110
B. Article 200
C. Article 250
D. Article 300
Answer: C. Article 250
Article 250 governs grounding and bonding practices.
9. What is the maximum overcurrent protection allowed for 14 AWG copper
conductors?
A. 10 amps
B. 15 amps
C. 20 amps
D. 25 amps
Answer: B. 15 amps
NEC 240.4(D) limits 14 AWG copper to 15 amps.
10.A transformer rated 75 kVA, 480V to 240V single-phase has a secondary
current of approximately:
A. 156 amps
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 (NEC) interpretation
Load calculations and demand factors
Grounding and bonding
Overcurrent protection
Wiring methods and materials
Motors and controls
Transformers
Special occupancies and equipment
1. A continuous load is defined by the NEC as a load where the maximum
current is expected to continue for how long?
A. 1 hour
B. 2 hours
C. 3 hours
D. 4 hours
Answer: C. 3 hours
Continuous loads are defined in NEC Article 100 as loads expected to run for
3 hours or more, requiring sizing at 125%.
2. What is the minimum conductor size permitted for a 20-amp branch circuit
supplying general-use receptacles?
A. 14 AWG
B. 12 AWG
, C. 10 AWG
D. 8 AWG
Answer: B. 12 AWG
NEC Table 310.16 and 240.4(D) specify 12 AWG copper as minimum for 20-
amp circuits.
3. What is the maximum number of 90°C conductors allowed in a conduit
before ampacity adjustment is required?
A. 2
B. 3
C. 4
D. 6
Answer: C. 4
Adjustment factors apply when more than three current-carrying
conductors are installed together.
4. What is the minimum depth for direct burial of residential branch circuits
rated 120V with GFCI protection?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: B. 12 inches
NEC Table 300.5 allows reduced depth for GFCI-protected circuits.
5. A feeder supplying a panelboard must be protected by what type of device?
A. Ground-fault relay
B. Overcurrent device
C. Surge protector
D. Disconnect switch only
Answer: B. Overcurrent device
Feeders must be protected against overcurrent per NEC Article 215.
6. What is the minimum working clearance in front of electrical equipment
operating at 120–250 volts?
, A. 24 inches
B. 30 inches
C. 36 inches
D. 48 inches
Answer: C. 36 inches
NEC 110.26 requires 3 feet clearance for typical systems.
7. What is the purpose of bonding in electrical systems?
A. Increase voltage
B. Reduce current flow
C. Ensure electrical continuity
D. Limit load demand
Answer: C. Ensure electrical continuity
Bonding connects conductive parts to maintain a safe fault path.
8. What NEC article covers grounding and bonding requirements?
A. Article 110
B. Article 200
C. Article 250
D. Article 300
Answer: C. Article 250
Article 250 governs grounding and bonding practices.
9. What is the maximum overcurrent protection allowed for 14 AWG copper
conductors?
A. 10 amps
B. 15 amps
C. 20 amps
D. 25 amps
Answer: B. 15 amps
NEC 240.4(D) limits 14 AWG copper to 15 amps.
10.A transformer rated 75 kVA, 480V to 240V single-phase has a secondary
current of approximately:
A. 156 amps
