Texas Master Electrician Exam
(Verified Answers) Plus Rationales
2025/2026 Q&A | Instant Download
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1. What is the minimum conductor size allowed for a 20-amp branch circuit
for general-purpose receptacles in dwelling units?
A) 10 AWG
B) 14 AWG
C) 12 AWG
D) 8 AWG
The NEC requires 12 AWG copper conductors for 20-amp circuits.
2. Which device is designed to protect against ground faults?
A) Fuse
B) Breaker
C) GFCI
D) AFCI
A Ground-Fault Circuit Interrupter (GFCI) protects people from ground
faults by tripping when leakage current is detected.
3. A dwelling unit requires a minimum of how many 20-amp small
appliance circuits?
A) 1
B) 2
C) 3
D) 4
The NEC mandates at least two 20-amp circuits for kitchen small
appliances.
4. What is the maximum voltage drop recommended for feeders to ensure
efficiency?
A) 2%
B) 3%
C) 5%
D) 10%
, NEC suggests a maximum total voltage drop of 5% (combined feeder and
branch circuits) to maintain performance.
5. Which conductor is suitable for wet locations?
A) THHN
B) THWN
C) NM-B
D) UF-B
THWN insulation is rated for wet locations; THHN is for dry locations.
6. What is the maximum spacing for 15- and 20-amp receptacles in
dwelling unit living areas?
A) 6 ft
B) 10 ft
C) 12 ft
D) 15 ft
Receptacles should be installed so no point along a wall is more than 6 ft
from an outlet, which equals a maximum spacing of 12 ft.
7. Which type of conduit is nonmetallic and suitable for underground
installations?
A) EMT
B) IMC
C) PVC
D) RMC
PVC is nonmetallic and rated for direct burial applications.
8. What is the minimum clearance above a residential driveway for a
service drop?
A) 10 ft
B) 12 ft
C) 15 ft
D) 18 ft
NEC 230.24 requires a minimum of 12 ft above residential driveways for
service drop conductors.
9. In a 3-phase, 4-wire system, which color is typically assigned to the
neutral conductor?
A) Black
B) Red
, C) Blue
D) White
NEC specifies white or gray as the neutral conductor color.
10.A 240-volt single-phase motor is rated 10 amps. What minimum breaker
size is required?
A) 10 A
B) 15 A
C) 20 A
D) 25 A
NEC 430.52 requires a breaker sized at 125% of full-load current for
motors: 10 × 1.25 = 12.5 → next standard size 20 A.
11.Which of the following is considered a hazardous (classified) location?
A) Office
B) Gas station pump area
C) Bedroom
D) Gymnasium
Areas where flammable vapors or dust may exist are classified hazardous
locations under NEC Article 500.
12.What is the minimum burial depth for rigid metal conduit under a
driveway?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
RMC must be buried at least 24 inches deep under areas subject to
vehicular traffic.
13.Which NEC article covers branch circuits?
A) 210
B) 220
C) 210
D) 230
Article 210 specifies requirements for branch circuits.
14.What is the primary purpose of a bonding jumper?
A) Increase voltage
B) Ensure electrical continuity
(Verified Answers) Plus Rationales
2025/2026 Q&A | Instant Download
1. What is the minimum conductor size allowed for a 20-amp branch circuit
for general-purpose receptacles in dwelling units?
A) 10 AWG
B) 14 AWG
C) 12 AWG
D) 8 AWG
The NEC requires 12 AWG copper conductors for 20-amp circuits.
2. Which device is designed to protect against ground faults?
A) Fuse
B) Breaker
C) GFCI
D) AFCI
A Ground-Fault Circuit Interrupter (GFCI) protects people from ground
faults by tripping when leakage current is detected.
3. A dwelling unit requires a minimum of how many 20-amp small
appliance circuits?
A) 1
B) 2
C) 3
D) 4
The NEC mandates at least two 20-amp circuits for kitchen small
appliances.
4. What is the maximum voltage drop recommended for feeders to ensure
efficiency?
A) 2%
B) 3%
C) 5%
D) 10%
, NEC suggests a maximum total voltage drop of 5% (combined feeder and
branch circuits) to maintain performance.
5. Which conductor is suitable for wet locations?
A) THHN
B) THWN
C) NM-B
D) UF-B
THWN insulation is rated for wet locations; THHN is for dry locations.
6. What is the maximum spacing for 15- and 20-amp receptacles in
dwelling unit living areas?
A) 6 ft
B) 10 ft
C) 12 ft
D) 15 ft
Receptacles should be installed so no point along a wall is more than 6 ft
from an outlet, which equals a maximum spacing of 12 ft.
7. Which type of conduit is nonmetallic and suitable for underground
installations?
A) EMT
B) IMC
C) PVC
D) RMC
PVC is nonmetallic and rated for direct burial applications.
8. What is the minimum clearance above a residential driveway for a
service drop?
A) 10 ft
B) 12 ft
C) 15 ft
D) 18 ft
NEC 230.24 requires a minimum of 12 ft above residential driveways for
service drop conductors.
9. In a 3-phase, 4-wire system, which color is typically assigned to the
neutral conductor?
A) Black
B) Red
, C) Blue
D) White
NEC specifies white or gray as the neutral conductor color.
10.A 240-volt single-phase motor is rated 10 amps. What minimum breaker
size is required?
A) 10 A
B) 15 A
C) 20 A
D) 25 A
NEC 430.52 requires a breaker sized at 125% of full-load current for
motors: 10 × 1.25 = 12.5 → next standard size 20 A.
11.Which of the following is considered a hazardous (classified) location?
A) Office
B) Gas station pump area
C) Bedroom
D) Gymnasium
Areas where flammable vapors or dust may exist are classified hazardous
locations under NEC Article 500.
12.What is the minimum burial depth for rigid metal conduit under a
driveway?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
RMC must be buried at least 24 inches deep under areas subject to
vehicular traffic.
13.Which NEC article covers branch circuits?
A) 210
B) 220
C) 210
D) 230
Article 210 specifies requirements for branch circuits.
14.What is the primary purpose of a bonding jumper?
A) Increase voltage
B) Ensure electrical continuity
