TENNESSEE ELECTRICAL CONTRACTOR EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES Q&A 2026
|IINSTANT DOWNLOAD PDF
1. What is the minimum gauge of copper wire required for a
20-amp residential branch circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Rationale: For residential circuits, 20-amp circuits require a
minimum of 12 AWG copper wire to safely carry current
without overheating.
Correct Answer: B. 12 AWG
2. Which device is used to protect a circuit from overcurrent
conditions?
A. Transformer
B. Circuit Breaker
C. Conduit
D. Junction Box
,Rationale: Circuit breakers are designed to automatically
interrupt current flow when the current exceeds the safe
rating, preventing fires and damage.
Correct Answer: B. Circuit Breaker
3. In residential wiring, what color is typically used for a
grounding conductor?
A. Black
B. White
C. Green or bare copper
D. Red
Rationale: Ground wires provide a safe path for electricity and
are required to be green or bare copper for identification.
Correct Answer: C. Green or bare copper
4. What is the maximum distance a receptacle can be from
another on a general-purpose 120V circuit in living areas?
A. 6 feet
B. 10 feet
C. 12 feet
D. 16 feet
Rationale: NEC requires that no point along a wall in a
habitable room be more than 6 feet from a receptacle to
,reduce reliance on extension cords.
Correct Answer: A. 6 feet
5. Which type of conduit is suitable for outdoor wet locations?
A. EMT (Electrical Metallic Tubing)
B. RMC (Rigid Metal Conduit)
C. FMC (Flexible Metal Conduit)
D. ENT (Electrical Nonmetallic Tubing)
Rationale: Rigid Metal Conduit (RMC) provides robust
protection against moisture, corrosion, and physical damage
outdoors.
Correct Answer: B. RMC (Rigid Metal Conduit)
6. What does GFCI protection prevent?
A. Overheating of wires
B. Electrical shock from ground faults
C. Voltage drop in circuits
D. Power surges
Rationale: Ground Fault Circuit Interrupters (GFCIs) detect
differences between hot and neutral current, shutting off
electricity to prevent shock.
Correct Answer: B. Electrical shock from ground faults
, 7. Which NEC article covers residential branch circuits and
feeders?
A. Article 210
B. Article 220
C. Article 230
D. Article 240
Rationale: NEC Article 210 specifically addresses requirements
for branch circuits, including wiring, protection, and receptacle
spacing.
Correct Answer: A. Article 210
8. What is the maximum number of 15-amp receptacles
allowed on a single 15-amp branch circuit?
A. 8
B. 10
C. 12
D. No specific limit, based on load
Rationale: NEC does not specify a maximum number of
receptacles; the load calculation determines the circuit
capacity.
Correct Answer: D. No specific limit, based on load
9. What type of electrical current is delivered by most
residential power systems?
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES Q&A 2026
|IINSTANT DOWNLOAD PDF
1. What is the minimum gauge of copper wire required for a
20-amp residential branch circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Rationale: For residential circuits, 20-amp circuits require a
minimum of 12 AWG copper wire to safely carry current
without overheating.
Correct Answer: B. 12 AWG
2. Which device is used to protect a circuit from overcurrent
conditions?
A. Transformer
B. Circuit Breaker
C. Conduit
D. Junction Box
,Rationale: Circuit breakers are designed to automatically
interrupt current flow when the current exceeds the safe
rating, preventing fires and damage.
Correct Answer: B. Circuit Breaker
3. In residential wiring, what color is typically used for a
grounding conductor?
A. Black
B. White
C. Green or bare copper
D. Red
Rationale: Ground wires provide a safe path for electricity and
are required to be green or bare copper for identification.
Correct Answer: C. Green or bare copper
4. What is the maximum distance a receptacle can be from
another on a general-purpose 120V circuit in living areas?
A. 6 feet
B. 10 feet
C. 12 feet
D. 16 feet
Rationale: NEC requires that no point along a wall in a
habitable room be more than 6 feet from a receptacle to
,reduce reliance on extension cords.
Correct Answer: A. 6 feet
5. Which type of conduit is suitable for outdoor wet locations?
A. EMT (Electrical Metallic Tubing)
B. RMC (Rigid Metal Conduit)
C. FMC (Flexible Metal Conduit)
D. ENT (Electrical Nonmetallic Tubing)
Rationale: Rigid Metal Conduit (RMC) provides robust
protection against moisture, corrosion, and physical damage
outdoors.
Correct Answer: B. RMC (Rigid Metal Conduit)
6. What does GFCI protection prevent?
A. Overheating of wires
B. Electrical shock from ground faults
C. Voltage drop in circuits
D. Power surges
Rationale: Ground Fault Circuit Interrupters (GFCIs) detect
differences between hot and neutral current, shutting off
electricity to prevent shock.
Correct Answer: B. Electrical shock from ground faults
, 7. Which NEC article covers residential branch circuits and
feeders?
A. Article 210
B. Article 220
C. Article 230
D. Article 240
Rationale: NEC Article 210 specifically addresses requirements
for branch circuits, including wiring, protection, and receptacle
spacing.
Correct Answer: A. Article 210
8. What is the maximum number of 15-amp receptacles
allowed on a single 15-amp branch circuit?
A. 8
B. 10
C. 12
D. No specific limit, based on load
Rationale: NEC does not specify a maximum number of
receptacles; the load calculation determines the circuit
capacity.
Correct Answer: D. No specific limit, based on load
9. What type of electrical current is delivered by most
residential power systems?
