California Low Voltage Systems Contractor Exam Questions
And Correct Answers (Verified Answers) Plus Rationales
2025/2026 Q&A | Instant Download Pdf
1. What is the maximum low voltage allowed for a Class 2 circuit under NEC?
A. 150 volts
B. 100 volts
C. 30 volts
D. 60 volts
Class 2 circuits are limited to 30 volts to reduce the risk of fire and electric shock.
2. Which of the following is considered a low voltage system?
A. 240V lighting system
B. 120V outlet
C. Intrusion alarm system
D. Electric water heater
Intrusion alarm systems typically use voltages under 30V, classifying them as
low voltage systems.
3. What color is used for a ground wire in a low voltage installation?
A. Red
B. Blue
C. Green or bare
D. White
Green or bare wires are universally recognized as grounding conductors.
, 4. In a Category 5e cable, how many twisted pairs are used?
A. 2
B. 3
C. 4
D. 5
CAT5e cables consist of 4 twisted pairs for data transmission.
5. A fire alarm system must be installed following which of the following
codes?
A. NEC Article 400
B. NFPA 72
C. NFPA 70E
D. UL 864
NFPA 72 is the National Fire Alarm and Signaling Code and governs fire alarm
systems.
6. What is the minimum burial depth for direct-burial low voltage cable?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
NEC Table 300.5 mandates a minimum depth of 18 inches for direct-burial of low
voltage cables.
7. Which component connects a coaxial cable to a video system?
, A. RJ45 connector
B. F-type connector
C. BNC connector
D. RCA connector
F-type connectors are standard for coaxial cable used in TV systems.
8. Which of the following is a proper firestopping method for wall
penetrations?
A. Spray foam
B. Silicone caulk
C. UL-listed firestop putty
D. PVC tape
UL-listed firestop materials are required to maintain wall fire ratings.
9. What does the NEC require for labeling low voltage circuits in a panel?
A. Panel schedule
B. Permanent and legible identification
C. Color coding only
D. Labels are not required
The NEC mandates that all circuits, including low voltage, must be legibly and
permanently labeled.
10.The maximum length for an Ethernet CAT6 cable is:
A. 50 meters
B. 100 meters
And Correct Answers (Verified Answers) Plus Rationales
2025/2026 Q&A | Instant Download Pdf
1. What is the maximum low voltage allowed for a Class 2 circuit under NEC?
A. 150 volts
B. 100 volts
C. 30 volts
D. 60 volts
Class 2 circuits are limited to 30 volts to reduce the risk of fire and electric shock.
2. Which of the following is considered a low voltage system?
A. 240V lighting system
B. 120V outlet
C. Intrusion alarm system
D. Electric water heater
Intrusion alarm systems typically use voltages under 30V, classifying them as
low voltage systems.
3. What color is used for a ground wire in a low voltage installation?
A. Red
B. Blue
C. Green or bare
D. White
Green or bare wires are universally recognized as grounding conductors.
, 4. In a Category 5e cable, how many twisted pairs are used?
A. 2
B. 3
C. 4
D. 5
CAT5e cables consist of 4 twisted pairs for data transmission.
5. A fire alarm system must be installed following which of the following
codes?
A. NEC Article 400
B. NFPA 72
C. NFPA 70E
D. UL 864
NFPA 72 is the National Fire Alarm and Signaling Code and governs fire alarm
systems.
6. What is the minimum burial depth for direct-burial low voltage cable?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
NEC Table 300.5 mandates a minimum depth of 18 inches for direct-burial of low
voltage cables.
7. Which component connects a coaxial cable to a video system?
, A. RJ45 connector
B. F-type connector
C. BNC connector
D. RCA connector
F-type connectors are standard for coaxial cable used in TV systems.
8. Which of the following is a proper firestopping method for wall
penetrations?
A. Spray foam
B. Silicone caulk
C. UL-listed firestop putty
D. PVC tape
UL-listed firestop materials are required to maintain wall fire ratings.
9. What does the NEC require for labeling low voltage circuits in a panel?
A. Panel schedule
B. Permanent and legible identification
C. Color coding only
D. Labels are not required
The NEC mandates that all circuits, including low voltage, must be legibly and
permanently labeled.
10.The maximum length for an Ethernet CAT6 cable is:
A. 50 meters
B. 100 meters
