Texas Electrical Contractor Licensing
Examination — Intermediate Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following is the primary purpose of a grounding
conductor in an electrical system?
A. To carry normal load current
B. To provide a path for fault current **
C. To act as a neutral conductor
D. To prevent overcurrent
Rationale: Grounding conductors provide a low-resistance path for fault
currents to help prevent electric shock and protect equipment.
, 2. According to the National Electrical Code (NEC), the maximum number
of 12 AWG conductors allowed in a 3/4-inch EMT conduit is:
A. 6 **
B. 7
C. 8
D. 9
Rationale: NEC conduit fill tables specify that up to 6 conductors of 12 AWG
can be installed in 3/4-inch EMT without exceeding fill limits.
3. Which type of overcurrent protection device is typically used to
protect motors from overload?
A. Fuse
B. Circuit breaker
C. Thermal overload relay **
D. GFCI
Rationale: Thermal overload relays are designed to protect motors from
overheating due to prolonged overcurrent conditions.
4. In a 3-phase, 4-wire wye system, the line-to-neutral voltage is 120V.
What is the line-to-line voltage?
A. 120V
B. 208V **
, C. 240V
D. 480V
Rationale: Line-to-line voltage in a wye system is √3 times the line-to-
neutral voltage: 120 × √3 ≈ 208V.
5. Which of the following is a primary hazard when working on energized
electrical equipment?
A. Arc flash **
B. Corrosion
C. Voltage drop
D. Electromagnetic interference
Rationale: Arc flash produces extreme heat, light, and pressure,
representing the primary danger when working on energized equipment.
6. A transformer has a primary voltage of 480V and a secondary voltage
of 120V. What is the turns ratio?
A. 2:1
B. 4:1
C. 5:1 **
D. 6:1
Rationale: Turns ratio = primary voltage ÷ secondary voltage = 480 ÷ 120 =
4:1. Corrected: actually 480 ÷ 120 = 4:1. The correct answer should be 4:1.
, Correction: B. 4:1
Rationale: Turns ratio = primary voltage ÷ secondary voltage = 480 ÷ 120 =
4:1.
7. The NEC requires that a receptacle installed outdoors be:
A. GFCI protected **
B. AFCI protected
C. Surge protected
D. Only weather-resistant
Rationale: Outdoor receptacles must be GFCI protected to prevent
electrical shock hazards.
8. Which type of wiring method is most commonly used for commercial
branch circuits?
A. NM cable
B. EMT conduit **
C. UF cable
D. Rigid nonmetallic conduit
Rationale: EMT conduit is widely used in commercial installations due to
durability and ease of modifications.
Examination — Intermediate Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following is the primary purpose of a grounding
conductor in an electrical system?
A. To carry normal load current
B. To provide a path for fault current **
C. To act as a neutral conductor
D. To prevent overcurrent
Rationale: Grounding conductors provide a low-resistance path for fault
currents to help prevent electric shock and protect equipment.
, 2. According to the National Electrical Code (NEC), the maximum number
of 12 AWG conductors allowed in a 3/4-inch EMT conduit is:
A. 6 **
B. 7
C. 8
D. 9
Rationale: NEC conduit fill tables specify that up to 6 conductors of 12 AWG
can be installed in 3/4-inch EMT without exceeding fill limits.
3. Which type of overcurrent protection device is typically used to
protect motors from overload?
A. Fuse
B. Circuit breaker
C. Thermal overload relay **
D. GFCI
Rationale: Thermal overload relays are designed to protect motors from
overheating due to prolonged overcurrent conditions.
4. In a 3-phase, 4-wire wye system, the line-to-neutral voltage is 120V.
What is the line-to-line voltage?
A. 120V
B. 208V **
, C. 240V
D. 480V
Rationale: Line-to-line voltage in a wye system is √3 times the line-to-
neutral voltage: 120 × √3 ≈ 208V.
5. Which of the following is a primary hazard when working on energized
electrical equipment?
A. Arc flash **
B. Corrosion
C. Voltage drop
D. Electromagnetic interference
Rationale: Arc flash produces extreme heat, light, and pressure,
representing the primary danger when working on energized equipment.
6. A transformer has a primary voltage of 480V and a secondary voltage
of 120V. What is the turns ratio?
A. 2:1
B. 4:1
C. 5:1 **
D. 6:1
Rationale: Turns ratio = primary voltage ÷ secondary voltage = 480 ÷ 120 =
4:1. Corrected: actually 480 ÷ 120 = 4:1. The correct answer should be 4:1.
, Correction: B. 4:1
Rationale: Turns ratio = primary voltage ÷ secondary voltage = 480 ÷ 120 =
4:1.
7. The NEC requires that a receptacle installed outdoors be:
A. GFCI protected **
B. AFCI protected
C. Surge protected
D. Only weather-resistant
Rationale: Outdoor receptacles must be GFCI protected to prevent
electrical shock hazards.
8. Which type of wiring method is most commonly used for commercial
branch circuits?
A. NM cable
B. EMT conduit **
C. UF cable
D. Rigid nonmetallic conduit
Rationale: EMT conduit is widely used in commercial installations due to
durability and ease of modifications.
