Tennessee Electrical Contractor Exam
Questions and Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of the National Electrical Code (NEC)?
A. To provide manufacturing standards for electrical equipment
B. To safeguard persons and property from electrical hazards
C. To regulate utility company pricing structures
D. To determine electrical contractor licensing fees
Rationale: The NEC is primarily focused on electrical safety, aiming to
protect people and property from hazards arising from electrical
installations, not pricing or licensing matters.
2. Which organization publishes the National Electrical Code (NEC)?
A. OSHA
B. National Fire Protection Association (NFPA)
,C. IEEE
D. NEC International
Rationale: The NFPA is responsible for publishing the NEC, which is
updated every three years.
3. What is the standard voltage for a typical residential dwelling
service in the U.S.?
A. 120V only
B. 120/240V single-phase
C. 240/480V three-phase
D. 277/480V single-phase
Rationale: Most U.S. residential services use a 120/240V split-phase
system.
4. According to NEC, equipment grounding conductors are intended
to:
A. Carry normal load current
B. Provide a low-impedance fault current path
C. Increase circuit resistance
D. Reduce voltage drop during normal operation
,Rationale: Equipment grounding conductors carry fault current only,
ensuring protective devices trip quickly.
5. What is the minimum clearance for overhead conductors above
residential property?
A. 8 feet
B. 10 feet
C. 12 feet
D. 15 feet
Rationale: NEC generally requires at least 12 feet clearance over
residential property for service-drop conductors.
6. A 20-ampere branch circuit is typically required to have conductors
rated at least:
A. 10 AWG copper
B. 12 AWG copper
C. 14 AWG copper
D. 8 AWG copper
Rationale: 12 AWG copper is rated for 20A circuits under standard
conditions.
, 7. What does “grounding” primarily connect to?
A. Circuit breakers
B. Earth or ground rods
C. Neutral bus only
D. Equipment enclosures only
Rationale: Grounding connects electrical systems to earth to stabilize
voltage and dissipate surges.
8. What is the purpose of a GFCI device?
A. Prevent overloads
B. Protect against ground-fault shock hazards
C. Increase voltage stability
D. Reduce harmonic distortion
Rationale: GFCIs detect leakage current and disconnect the circuit to
prevent electric shock.
9. What is the maximum number of bends allowed between pull
points in a conduit run?
Questions and Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of the National Electrical Code (NEC)?
A. To provide manufacturing standards for electrical equipment
B. To safeguard persons and property from electrical hazards
C. To regulate utility company pricing structures
D. To determine electrical contractor licensing fees
Rationale: The NEC is primarily focused on electrical safety, aiming to
protect people and property from hazards arising from electrical
installations, not pricing or licensing matters.
2. Which organization publishes the National Electrical Code (NEC)?
A. OSHA
B. National Fire Protection Association (NFPA)
,C. IEEE
D. NEC International
Rationale: The NFPA is responsible for publishing the NEC, which is
updated every three years.
3. What is the standard voltage for a typical residential dwelling
service in the U.S.?
A. 120V only
B. 120/240V single-phase
C. 240/480V three-phase
D. 277/480V single-phase
Rationale: Most U.S. residential services use a 120/240V split-phase
system.
4. According to NEC, equipment grounding conductors are intended
to:
A. Carry normal load current
B. Provide a low-impedance fault current path
C. Increase circuit resistance
D. Reduce voltage drop during normal operation
,Rationale: Equipment grounding conductors carry fault current only,
ensuring protective devices trip quickly.
5. What is the minimum clearance for overhead conductors above
residential property?
A. 8 feet
B. 10 feet
C. 12 feet
D. 15 feet
Rationale: NEC generally requires at least 12 feet clearance over
residential property for service-drop conductors.
6. A 20-ampere branch circuit is typically required to have conductors
rated at least:
A. 10 AWG copper
B. 12 AWG copper
C. 14 AWG copper
D. 8 AWG copper
Rationale: 12 AWG copper is rated for 20A circuits under standard
conditions.
, 7. What does “grounding” primarily connect to?
A. Circuit breakers
B. Earth or ground rods
C. Neutral bus only
D. Equipment enclosures only
Rationale: Grounding connects electrical systems to earth to stabilize
voltage and dissipate surges.
8. What is the purpose of a GFCI device?
A. Prevent overloads
B. Protect against ground-fault shock hazards
C. Increase voltage stability
D. Reduce harmonic distortion
Rationale: GFCIs detect leakage current and disconnect the circuit to
prevent electric shock.
9. What is the maximum number of bends allowed between pull
points in a conduit run?
