California General Electrician Certification Exam
Verified Questions, Correct Answers, and Detailed
Explanations for Science Students||Already Graded
A+
1. What is the maximum allowable voltage drop for a feeder circuit
according to NEC recommendations?
A. 1%
B. 3%
C. 5%
D. 10%
Answer: B. 3%
The NEC recommends that voltage drop should not exceed 3% for
feeders to ensure efficient operation of electrical equipment.
2. Which of the following conductor materials is most commonly
used for residential wiring in California?
A. Aluminum
B. Copper
C. Silver
D. Steel
Answer: B. Copper
Copper is preferred due to its high conductivity, durability, and ease
of use.
3. In NEC terms, what is the minimum burial depth for a 120V, 20-
ampere residential circuit in PVC conduit?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: B. 12 inches
PVC conduit for residential circuits must be buried at least 12 inches
to protect the wiring.
,4. What is the primary purpose of a ground-fault circuit interrupter
(GFCI)?
A. Prevent short circuits
B. Reduce voltage drop
C. Protect against electric shock
D. Increase circuit amperage
Answer: C. Protect against electric shock
GFCIs detect current leakage to ground and interrupt the circuit to
prevent electrocution.
5. Which NEC article governs general wiring methods and
materials?
A. Article 110
B. Article 300
C. Article 210
D. Article 250
Answer: B. Article 300
Article 300 covers wiring methods, installation, and materials for
electrical systems.
6. What is the standard residential service voltage in California?
A. 120/208V
B. 120/240V
C. 240/480V
D. 277/480V
Answer: B. 120/240V
Most California homes use a split-phase 120/240V service for
standard appliances and lighting.
7. For a 3-phase, 4-wire, 480Y/277V system, what is the line-to-line
voltage?
A. 120V
B. 208V
C. 277V
D. 480V
, Answer: D. 480V
In a wye configuration, the line-to-line voltage is 480V, while line-to-
neutral is 277V.
8. Which of the following is required at the main service
disconnect?
A. Grounding electrode conductor connection
B. Surge protector
C. Arc-fault breaker
D. Voltage regulator
Answer: A. Grounding electrode conductor connection
The NEC requires proper grounding of the electrical service to protect
against electrical faults.
9. What is the minimum number of receptacle outlets required in a
12-foot wall of a residential living room?
A. 1
B. 2
C. 3
D. 4
Answer: B. 2
NEC requires outlets so that no point along the floor line is more than
6 feet from an outlet; a 12-foot wall needs at least 2.
10. Which type of conduit is permitted for underground residential
service entrance (URD) installations?
A. EMT
B. RMC
C. PVC
D. FMC
Answer: C. PVC
PVC conduit is corrosion-resistant and suitable for direct burial
underground.
Verified Questions, Correct Answers, and Detailed
Explanations for Science Students||Already Graded
A+
1. What is the maximum allowable voltage drop for a feeder circuit
according to NEC recommendations?
A. 1%
B. 3%
C. 5%
D. 10%
Answer: B. 3%
The NEC recommends that voltage drop should not exceed 3% for
feeders to ensure efficient operation of electrical equipment.
2. Which of the following conductor materials is most commonly
used for residential wiring in California?
A. Aluminum
B. Copper
C. Silver
D. Steel
Answer: B. Copper
Copper is preferred due to its high conductivity, durability, and ease
of use.
3. In NEC terms, what is the minimum burial depth for a 120V, 20-
ampere residential circuit in PVC conduit?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: B. 12 inches
PVC conduit for residential circuits must be buried at least 12 inches
to protect the wiring.
,4. What is the primary purpose of a ground-fault circuit interrupter
(GFCI)?
A. Prevent short circuits
B. Reduce voltage drop
C. Protect against electric shock
D. Increase circuit amperage
Answer: C. Protect against electric shock
GFCIs detect current leakage to ground and interrupt the circuit to
prevent electrocution.
5. Which NEC article governs general wiring methods and
materials?
A. Article 110
B. Article 300
C. Article 210
D. Article 250
Answer: B. Article 300
Article 300 covers wiring methods, installation, and materials for
electrical systems.
6. What is the standard residential service voltage in California?
A. 120/208V
B. 120/240V
C. 240/480V
D. 277/480V
Answer: B. 120/240V
Most California homes use a split-phase 120/240V service for
standard appliances and lighting.
7. For a 3-phase, 4-wire, 480Y/277V system, what is the line-to-line
voltage?
A. 120V
B. 208V
C. 277V
D. 480V
, Answer: D. 480V
In a wye configuration, the line-to-line voltage is 480V, while line-to-
neutral is 277V.
8. Which of the following is required at the main service
disconnect?
A. Grounding electrode conductor connection
B. Surge protector
C. Arc-fault breaker
D. Voltage regulator
Answer: A. Grounding electrode conductor connection
The NEC requires proper grounding of the electrical service to protect
against electrical faults.
9. What is the minimum number of receptacle outlets required in a
12-foot wall of a residential living room?
A. 1
B. 2
C. 3
D. 4
Answer: B. 2
NEC requires outlets so that no point along the floor line is more than
6 feet from an outlet; a 12-foot wall needs at least 2.
10. Which type of conduit is permitted for underground residential
service entrance (URD) installations?
A. EMT
B. RMC
C. PVC
D. FMC
Answer: C. PVC
PVC conduit is corrosion-resistant and suitable for direct burial
underground.
