TEXAS MASTER ELECTRICIAN EXAM
1. What is the primary purpose of bonding in an electrical
system?
A. To increase voltage
B. To reduce resistance in branch circuits
C. To ensure electrical continuity and fault current path
D. To stabilize transformer frequency
Bonding connects metallic parts together to create a low-
impedance path for fault current. This helps ensure overcurrent
devices operate quickly during a fault, reducing shock and fire
hazards.
2. According to the NEC, what is the minimum working space
depth for equipment operating at 0–150 volts to ground?
A. 24 inches
B. 36 inches
C. 42 inches
D. 48 inches
NEC 110.26 requires a minimum working clearance depth of 36
inches for equipment operating at 0–150 volts to ground under
Condition 1.
3. Which conductor is identified by a white or gray outer
finish?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Grounded conductor
D. Bonding jumper
The grounded conductor, commonly called the neutral
conductor, must be identified with white or gray insulation
according to NEC 200.6.
, 4. What device is designed to protect conductors from
overcurrent?
A. Relay
B. Disconnect switch
C. Transformer
D. Circuit breaker
Circuit breakers automatically open a circuit during overload or
short-circuit conditions, protecting conductors and equipment
from damage.
5. What is the maximum continuous load permitted on a
branch circuit before derating is required?
A. 50%
B. 70%
C. 80%
D. 100%
Continuous loads are limited to 80% of the branch circuit rating
unless the overcurrent device and assembly are listed for 100%
operation.
6. Which NEC article covers grounding and bonding
requirements?
A. Article 110
B. Article 210
C. Article 300
D. Article 250
NEC Article 250 establishes the rules for grounding and bonding
electrical systems and equipment.
7. What is the minimum cover requirement for PVC conduit
under a residential driveway?
A. 6 inches
, B. 12 inches
C. 18 inches
D. 24 inches
NEC Table 300.5 specifies 18 inches of cover for PVC conduit
installed under residential driveways.
8. Which type of motor draws the highest current during
startup?
A. Capacitor-start motor
B. Synchronous motor
C. Universal motor
D. Induction motor
Induction motors commonly experience high inrush current
during startup, often 5–7 times the full-load current.
9. What does GFCI protection primarily guard against?
A. Overload conditions
B. Arc faults
C. Ground faults causing shock hazards
D. Voltage drop
Ground-Fault Circuit Interrupters detect imbalance between hot
and neutral conductors and quickly disconnect power to reduce
electric shock risk.
10. Which conductor ampacity adjustment factor applies
when there are 7 current-carrying conductors in a
raceway?
A. 80%
B. 70%
C. 60%
D. 50%
1. What is the primary purpose of bonding in an electrical
system?
A. To increase voltage
B. To reduce resistance in branch circuits
C. To ensure electrical continuity and fault current path
D. To stabilize transformer frequency
Bonding connects metallic parts together to create a low-
impedance path for fault current. This helps ensure overcurrent
devices operate quickly during a fault, reducing shock and fire
hazards.
2. According to the NEC, what is the minimum working space
depth for equipment operating at 0–150 volts to ground?
A. 24 inches
B. 36 inches
C. 42 inches
D. 48 inches
NEC 110.26 requires a minimum working clearance depth of 36
inches for equipment operating at 0–150 volts to ground under
Condition 1.
3. Which conductor is identified by a white or gray outer
finish?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Grounded conductor
D. Bonding jumper
The grounded conductor, commonly called the neutral
conductor, must be identified with white or gray insulation
according to NEC 200.6.
, 4. What device is designed to protect conductors from
overcurrent?
A. Relay
B. Disconnect switch
C. Transformer
D. Circuit breaker
Circuit breakers automatically open a circuit during overload or
short-circuit conditions, protecting conductors and equipment
from damage.
5. What is the maximum continuous load permitted on a
branch circuit before derating is required?
A. 50%
B. 70%
C. 80%
D. 100%
Continuous loads are limited to 80% of the branch circuit rating
unless the overcurrent device and assembly are listed for 100%
operation.
6. Which NEC article covers grounding and bonding
requirements?
A. Article 110
B. Article 210
C. Article 300
D. Article 250
NEC Article 250 establishes the rules for grounding and bonding
electrical systems and equipment.
7. What is the minimum cover requirement for PVC conduit
under a residential driveway?
A. 6 inches
, B. 12 inches
C. 18 inches
D. 24 inches
NEC Table 300.5 specifies 18 inches of cover for PVC conduit
installed under residential driveways.
8. Which type of motor draws the highest current during
startup?
A. Capacitor-start motor
B. Synchronous motor
C. Universal motor
D. Induction motor
Induction motors commonly experience high inrush current
during startup, often 5–7 times the full-load current.
9. What does GFCI protection primarily guard against?
A. Overload conditions
B. Arc faults
C. Ground faults causing shock hazards
D. Voltage drop
Ground-Fault Circuit Interrupters detect imbalance between hot
and neutral conductors and quickly disconnect power to reduce
electric shock risk.
10. Which conductor ampacity adjustment factor applies
when there are 7 current-carrying conductors in a
raceway?
A. 80%
B. 70%
C. 60%
D. 50%
