Texas Electrical Contractor Exam With
Actual Questions & Verified
Answers,Plus Rationales/Expert
Verified For Guaranteed Pass Graded
A+/2026 /Latest Update/Instant
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1. Which of the following is the minimum wire size permitted for a 20-
ampere branch circuit supplying general lighting and receptacle outlets?
A. 12 AWG
B. 14 AWG
C. 10 AWG
D. 8 AWG
A. 12 AWG
Rationale: According to the NEC, a 20-ampere branch circuit requires a
minimum of 12 AWG copper conductor to safely handle the current load.
2. What is the maximum number of 12 AWG conductors allowed in a 20-
ampere conduit according to the NEC?
A. 6
B. 8
C. 10
D. 12
B. 8
Rationale: NEC conduit fill tables limit the number of conductors to prevent
overheating. For 12 AWG conductors in a 20-ampere circuit, the maximum in
a standard conduit is 8.
, 3. Which type of grounding electrode is required to be installed at a new
residential service?
A. Plate electrode
B. Rod electrode
C. Concrete-encased electrode
D. Any of the above
D. Any of the above
Rationale: The NEC allows multiple types of grounding electrodes, including
rods, plates, and concrete-encased electrodes, as long as they meet code
requirements.
4. A 240-volt branch circuit is required to supply a fixed electric water
heater. Which breaker rating is appropriate?
A. 15 A
B. 20 A
C. 30 A
D. 40 A
C. 30 A
Rationale: Electric water heaters typically require a 240-volt, 30-ampere
circuit, per NEC Table 422.11.
5. In a commercial setting, which type of wiring method is acceptable for
exposed work?
A. Nonmetallic-sheathed cable
B. Rigid metal conduit
C. Underground feeder
D. None of the above
B. Rigid metal conduit
Rationale: Exposed work in commercial settings requires a protected method
such as rigid metal conduit to prevent physical damage.
6. The minimum working space in front of electrical equipment operating
at 1200 volts is:
A. 2 feet
B. 3 feet
, C. 3.5 feet
D. 4 feet
B. 3 feet
Rationale: NEC 110.26 specifies that a minimum of 3 feet of clear working
space is required in front of electrical equipment for safe access.
7. Which type of conductor insulation is suitable for wet locations?
A. THHN
B. THWN
C. NM-B
D. UF-B
B. THWN
Rationale: THWN is rated for wet locations, while THHN is dry only. NM-B and
UF-B have specific applications but not generally for wet locations.
8. What is the purpose of a GFCI outlet?
A. Protect equipment from overload
B. Protect conductors from overheating
C. Protect people from electric shock
D. Reduce voltage drop
C. Protect people from electric shock
Rationale: Ground-Fault Circuit Interrupters (GFCIs) are designed to protect
users from electric shock by detecting current leakage to ground.
9. What is the maximum allowable voltage drop for feeders and branch
circuits to ensure efficient operation?
A. 2%
B. 3%
C. 5%
D. 10%
C. 5%
Rationale: NEC recommends a maximum combined voltage drop of 5% for
feeders and branch circuits to ensure equipment operates efficiently.
10.Which type of overcurrent protection is used for motors?
A. Fuses
Actual Questions & Verified
Answers,Plus Rationales/Expert
Verified For Guaranteed Pass Graded
A+/2026 /Latest Update/Instant
Download Pdf
1. Which of the following is the minimum wire size permitted for a 20-
ampere branch circuit supplying general lighting and receptacle outlets?
A. 12 AWG
B. 14 AWG
C. 10 AWG
D. 8 AWG
A. 12 AWG
Rationale: According to the NEC, a 20-ampere branch circuit requires a
minimum of 12 AWG copper conductor to safely handle the current load.
2. What is the maximum number of 12 AWG conductors allowed in a 20-
ampere conduit according to the NEC?
A. 6
B. 8
C. 10
D. 12
B. 8
Rationale: NEC conduit fill tables limit the number of conductors to prevent
overheating. For 12 AWG conductors in a 20-ampere circuit, the maximum in
a standard conduit is 8.
, 3. Which type of grounding electrode is required to be installed at a new
residential service?
A. Plate electrode
B. Rod electrode
C. Concrete-encased electrode
D. Any of the above
D. Any of the above
Rationale: The NEC allows multiple types of grounding electrodes, including
rods, plates, and concrete-encased electrodes, as long as they meet code
requirements.
4. A 240-volt branch circuit is required to supply a fixed electric water
heater. Which breaker rating is appropriate?
A. 15 A
B. 20 A
C. 30 A
D. 40 A
C. 30 A
Rationale: Electric water heaters typically require a 240-volt, 30-ampere
circuit, per NEC Table 422.11.
5. In a commercial setting, which type of wiring method is acceptable for
exposed work?
A. Nonmetallic-sheathed cable
B. Rigid metal conduit
C. Underground feeder
D. None of the above
B. Rigid metal conduit
Rationale: Exposed work in commercial settings requires a protected method
such as rigid metal conduit to prevent physical damage.
6. The minimum working space in front of electrical equipment operating
at 1200 volts is:
A. 2 feet
B. 3 feet
, C. 3.5 feet
D. 4 feet
B. 3 feet
Rationale: NEC 110.26 specifies that a minimum of 3 feet of clear working
space is required in front of electrical equipment for safe access.
7. Which type of conductor insulation is suitable for wet locations?
A. THHN
B. THWN
C. NM-B
D. UF-B
B. THWN
Rationale: THWN is rated for wet locations, while THHN is dry only. NM-B and
UF-B have specific applications but not generally for wet locations.
8. What is the purpose of a GFCI outlet?
A. Protect equipment from overload
B. Protect conductors from overheating
C. Protect people from electric shock
D. Reduce voltage drop
C. Protect people from electric shock
Rationale: Ground-Fault Circuit Interrupters (GFCIs) are designed to protect
users from electric shock by detecting current leakage to ground.
9. What is the maximum allowable voltage drop for feeders and branch
circuits to ensure efficient operation?
A. 2%
B. 3%
C. 5%
D. 10%
C. 5%
Rationale: NEC recommends a maximum combined voltage drop of 5% for
feeders and branch circuits to ensure equipment operates efficiently.
10.Which type of overcurrent protection is used for motors?
A. Fuses
