Tennessee Electrical Contractor Exam
(CE) Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
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1. In the context of the National Electrical Code, what is the primary
purpose of grounding electrical systems in residential and commercial
installations?
A. To increase voltage stability across circuits
B. To provide a path for normal current flow
C. To reduce power consumption in electrical systems
D. To provide a safe path for fault current to prevent shock and fire
hazards
Rationale: Grounding ensures that fault current has a low-resistance path
to earth, reducing the risk of electric shock and preventing equipment
damage or fire hazards.
2. According to NEC requirements, what is the maximum allowable
continuous load on a circuit rated for 20 amperes?
A. 20 amperes
B. 18 amperes
C. 16 amperes
D. 14 amperes
,Rationale: NEC defines continuous loads as those running for 3 hours or
more and limits them to 80% of circuit rating, which is 16A for a 20A
circuit.
3. What color insulation is typically used to identify grounded conductors
in standard electrical wiring?
A. Red
B. Black
C. Green
D. White or gray
Rationale: NEC specifies white or gray insulation for grounded (neutral)
conductors to ensure proper identification and safety.
4. What is the minimum burial depth required for direct burial UF cable
under a residential driveway according to NEC guidelines?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Rationale: NEC requires at least 18 inches of cover for direct burial cable
under residential driveways to protect against damage.
5. What type of circuit breaker is required for bathroom receptacles in
residential installations?
A. Standard breaker
B. AFCI breaker
C. GFCI breaker
D. Dual-function breaker only
Rationale: GFCI protection is required in bathrooms to prevent electric
shock due to moisture exposure.
6. Which NEC article governs the installation of branch circuits?
A. Article 110
B. Article 220
, C. Article 210
D. Article 300
Rationale: Article 210 specifically addresses branch circuits, including
ratings, loads, and installation requirements.
7. What is the function of a GFCI device?
A. To regulate voltage
B. To increase current flow
C. To protect against overload
D. To detect ground faults and interrupt current flow
Rationale: GFCI devices monitor imbalance between hot and neutral
currents and shut off power when a ground fault is detected.
8. What is the minimum conductor size permitted for a 15-amp branch
circuit?
A. 16 AWG
B. 14 AWG
C. 12 AWG
D. 10 AWG
Rationale: NEC requires a minimum of 14 AWG copper conductors for 15-
amp circuits.
9. What does AFCI protection guard against?
A. Overcurrent
B. Ground faults
C. Voltage spikes
D. Arc faults that may cause fires
Rationale: AFCI devices detect dangerous arcing conditions that could
ignite fires.
10. What is the purpose of a disconnect switch?
A. To regulate current flow
B. To step down voltage
(CE) Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. In the context of the National Electrical Code, what is the primary
purpose of grounding electrical systems in residential and commercial
installations?
A. To increase voltage stability across circuits
B. To provide a path for normal current flow
C. To reduce power consumption in electrical systems
D. To provide a safe path for fault current to prevent shock and fire
hazards
Rationale: Grounding ensures that fault current has a low-resistance path
to earth, reducing the risk of electric shock and preventing equipment
damage or fire hazards.
2. According to NEC requirements, what is the maximum allowable
continuous load on a circuit rated for 20 amperes?
A. 20 amperes
B. 18 amperes
C. 16 amperes
D. 14 amperes
,Rationale: NEC defines continuous loads as those running for 3 hours or
more and limits them to 80% of circuit rating, which is 16A for a 20A
circuit.
3. What color insulation is typically used to identify grounded conductors
in standard electrical wiring?
A. Red
B. Black
C. Green
D. White or gray
Rationale: NEC specifies white or gray insulation for grounded (neutral)
conductors to ensure proper identification and safety.
4. What is the minimum burial depth required for direct burial UF cable
under a residential driveway according to NEC guidelines?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Rationale: NEC requires at least 18 inches of cover for direct burial cable
under residential driveways to protect against damage.
5. What type of circuit breaker is required for bathroom receptacles in
residential installations?
A. Standard breaker
B. AFCI breaker
C. GFCI breaker
D. Dual-function breaker only
Rationale: GFCI protection is required in bathrooms to prevent electric
shock due to moisture exposure.
6. Which NEC article governs the installation of branch circuits?
A. Article 110
B. Article 220
, C. Article 210
D. Article 300
Rationale: Article 210 specifically addresses branch circuits, including
ratings, loads, and installation requirements.
7. What is the function of a GFCI device?
A. To regulate voltage
B. To increase current flow
C. To protect against overload
D. To detect ground faults and interrupt current flow
Rationale: GFCI devices monitor imbalance between hot and neutral
currents and shut off power when a ground fault is detected.
8. What is the minimum conductor size permitted for a 15-amp branch
circuit?
A. 16 AWG
B. 14 AWG
C. 12 AWG
D. 10 AWG
Rationale: NEC requires a minimum of 14 AWG copper conductors for 15-
amp circuits.
9. What does AFCI protection guard against?
A. Overcurrent
B. Ground faults
C. Voltage spikes
D. Arc faults that may cause fires
Rationale: AFCI devices detect dangerous arcing conditions that could
ignite fires.
10. What is the purpose of a disconnect switch?
A. To regulate current flow
B. To step down voltage
