CSLB C10 Test 1 Latest 2026 Newest
Questions and Answers MOCK EXAM
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1. A contractor is installing a new branch circuit for lighting in a commercial
space. What is the minimum conductor size permitted for a 20-amp circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 16 AWG
✔ Correct Answer: B. 12 AWG
Explanation: NEC requires 12 AWG copper conductors for 20-amp circuits
to safely handle current without overheating.
2. A grounded conductor is commonly referred to as which of the following?
A. Hot conductor
B. Equipment ground
C. Neutral conductor
D. Bonding jumper
✔ Correct Answer: C. Neutral conductor
, Explanation: The grounded conductor is the neutral, which carries current
back to the source under normal operation.
3. What is the primary purpose of a GFCI device?
A. Protect equipment
B. Prevent overloads
C. Protect people from shock
D. Regulate voltage
✔ Correct Answer: C. Protect people from shock
Explanation: Ground-Fault Circuit Interrupters detect imbalance and
quickly shut off power to prevent electric shock.
4. In a residential installation, receptacles in bathrooms must be:
A. AFCI protected
B. GFCI protected
C. Isolated
D. Ungrounded
✔ Correct Answer: B. GFCI protected
Explanation: NEC requires GFCI protection in bathrooms due to high
moisture and shock risk.
5. What color is typically used for an ungrounded conductor?
A. Green
B. White
C. Black
D. Gray
✔ Correct Answer: C. Black
Explanation: Black is standard for hot (ungrounded) conductors in single-
phase systems.
6. What does NEC stand for?
A. National Electrical Code
B. National Energy Circuit
C. Neutral Electrical Control
, D. Network Electric Code
✔ Correct Answer: A. National Electrical Code
Explanation: NEC is the standard governing safe electrical installations in
the U.S.
7. What is the function of a circuit breaker?
A. Store electricity
B. Increase voltage
C. Interrupt overcurrent
D. Reduce resistance
✔ Correct Answer: C. Interrupt overcurrent
Explanation: Circuit breakers protect circuits by opening during overload
or short circuit conditions.
8. What is the maximum number of 90-degree bends allowed in conduit
between pull points?
A. 2
B. 3
C. 4
D. 5
✔ Correct Answer: C. 4
Explanation: NEC limits bends to 360 degrees total between pull points.
9. A bonding jumper connects:
A. Hot to neutral
B. Neutral to ground
C. Equipment parts for continuity
D. Breaker to panel
✔ Correct Answer: C. Equipment parts for continuity
Explanation: Bonding ensures all metal parts are electrically continuous
and safe.
10.What type of box is required for outdoor wet locations?
A. Plastic only
Questions and Answers MOCK EXAM
LATEST 2026 UPDATE FAST REVIWED
FROM ACTUAL TEST 100 QUESTIONS
AND 100% VERIFIED ANSWERS| A+
GRADE Q&A | INSTANT DOWNLOAD
1. A contractor is installing a new branch circuit for lighting in a commercial
space. What is the minimum conductor size permitted for a 20-amp circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 16 AWG
✔ Correct Answer: B. 12 AWG
Explanation: NEC requires 12 AWG copper conductors for 20-amp circuits
to safely handle current without overheating.
2. A grounded conductor is commonly referred to as which of the following?
A. Hot conductor
B. Equipment ground
C. Neutral conductor
D. Bonding jumper
✔ Correct Answer: C. Neutral conductor
, Explanation: The grounded conductor is the neutral, which carries current
back to the source under normal operation.
3. What is the primary purpose of a GFCI device?
A. Protect equipment
B. Prevent overloads
C. Protect people from shock
D. Regulate voltage
✔ Correct Answer: C. Protect people from shock
Explanation: Ground-Fault Circuit Interrupters detect imbalance and
quickly shut off power to prevent electric shock.
4. In a residential installation, receptacles in bathrooms must be:
A. AFCI protected
B. GFCI protected
C. Isolated
D. Ungrounded
✔ Correct Answer: B. GFCI protected
Explanation: NEC requires GFCI protection in bathrooms due to high
moisture and shock risk.
5. What color is typically used for an ungrounded conductor?
A. Green
B. White
C. Black
D. Gray
✔ Correct Answer: C. Black
Explanation: Black is standard for hot (ungrounded) conductors in single-
phase systems.
6. What does NEC stand for?
A. National Electrical Code
B. National Energy Circuit
C. Neutral Electrical Control
, D. Network Electric Code
✔ Correct Answer: A. National Electrical Code
Explanation: NEC is the standard governing safe electrical installations in
the U.S.
7. What is the function of a circuit breaker?
A. Store electricity
B. Increase voltage
C. Interrupt overcurrent
D. Reduce resistance
✔ Correct Answer: C. Interrupt overcurrent
Explanation: Circuit breakers protect circuits by opening during overload
or short circuit conditions.
8. What is the maximum number of 90-degree bends allowed in conduit
between pull points?
A. 2
B. 3
C. 4
D. 5
✔ Correct Answer: C. 4
Explanation: NEC limits bends to 360 degrees total between pull points.
9. A bonding jumper connects:
A. Hot to neutral
B. Neutral to ground
C. Equipment parts for continuity
D. Breaker to panel
✔ Correct Answer: C. Equipment parts for continuity
Explanation: Bonding ensures all metal parts are electrically continuous
and safe.
10.What type of box is required for outdoor wet locations?
A. Plastic only
