California C-10 Electrical Contractor
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1. What is the primary purpose of the National Electrical Code?
A. To provide design aesthetics
B. To ensure electrical safety standards
C. To regulate contractor licensing
D. To establish labor wages
Answer: B
The National Electrical Code establishes minimum electrical safety
requirements to protect people and property from hazards.
2. Which organization publishes the NEC?
A. OSHA
B. IEEE
C. NFPA
D. ANSI
Answer: C
The NEC is published by the National Fire Protection Association (NFPA),
focusing on fire and electrical safety.
,3. What is the minimum burial depth for rigid metal conduit under a
residential driveway?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: C
The NEC specifies 18 inches minimum for rigid metal conduit under
driveways to prevent mechanical damage.
4. Which wire type is rated for wet locations?
A. NM
B. THHN
C. THWN
D. UF-B
Answer: C
THWN conductors are rated for wet locations, ensuring insulation integrity
in moisture.
5. What does GFCI stand for?
A. Ground Fault Current Interrupter
B. Ground Fault Circuit Interrupter
C. Ground Flow Circuit Indicator
D. Ground Fault Control Isolator
Answer: B
GFCI devices protect against ground fault shock hazards by interrupting
current flow.
6. Where are GFCI outlets required?
A. Bedrooms
B. Kitchens and bathrooms
C. Living rooms
D. Closets
Answer: B
, GFCIs are required in wet or damp locations like kitchens and bathrooms
to prevent electric shock.
7. What is the purpose of bonding?
A. Increase voltage
B. Reduce resistance
C. Ensure electrical continuity
D. Improve insulation
Answer: C
Bonding ensures electrical continuity and reduces shock risk by
connecting conductive parts.
8. What size conductor is required for a 20-amp circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: B
12 AWG wire is rated for 20 amps, preventing overheating.
9. What is the standard voltage for residential outlets in the U.S.?
A. 110V
B. 115V
C. 120V
D. 240V
Answer: C
Standard residential voltage is 120 volts, ensuring compatibility with
household appliances.
10.What type of breaker is required for bedroom circuits?
A. GFCI
B. AFCI
C. Standard
D. Dual-purpose
Exam Practice Test Newest 2025-2026
Update Questions Fast Reviwed From
Actual Exams 100 Questions And 100%
Verified Answers With Convenient
Explanations Grade A+ Q&A | Instant
Download Pdf
1. What is the primary purpose of the National Electrical Code?
A. To provide design aesthetics
B. To ensure electrical safety standards
C. To regulate contractor licensing
D. To establish labor wages
Answer: B
The National Electrical Code establishes minimum electrical safety
requirements to protect people and property from hazards.
2. Which organization publishes the NEC?
A. OSHA
B. IEEE
C. NFPA
D. ANSI
Answer: C
The NEC is published by the National Fire Protection Association (NFPA),
focusing on fire and electrical safety.
,3. What is the minimum burial depth for rigid metal conduit under a
residential driveway?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: C
The NEC specifies 18 inches minimum for rigid metal conduit under
driveways to prevent mechanical damage.
4. Which wire type is rated for wet locations?
A. NM
B. THHN
C. THWN
D. UF-B
Answer: C
THWN conductors are rated for wet locations, ensuring insulation integrity
in moisture.
5. What does GFCI stand for?
A. Ground Fault Current Interrupter
B. Ground Fault Circuit Interrupter
C. Ground Flow Circuit Indicator
D. Ground Fault Control Isolator
Answer: B
GFCI devices protect against ground fault shock hazards by interrupting
current flow.
6. Where are GFCI outlets required?
A. Bedrooms
B. Kitchens and bathrooms
C. Living rooms
D. Closets
Answer: B
, GFCIs are required in wet or damp locations like kitchens and bathrooms
to prevent electric shock.
7. What is the purpose of bonding?
A. Increase voltage
B. Reduce resistance
C. Ensure electrical continuity
D. Improve insulation
Answer: C
Bonding ensures electrical continuity and reduces shock risk by
connecting conductive parts.
8. What size conductor is required for a 20-amp circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: B
12 AWG wire is rated for 20 amps, preventing overheating.
9. What is the standard voltage for residential outlets in the U.S.?
A. 110V
B. 115V
C. 120V
D. 240V
Answer: C
Standard residential voltage is 120 volts, ensuring compatibility with
household appliances.
10.What type of breaker is required for bedroom circuits?
A. GFCI
B. AFCI
C. Standard
D. Dual-purpose
