Contractor Exam Questions And

CA C7 Low Voltage Systems Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• Which of the following is considered a low voltage system?
• 480V three-phase power
• 24V fire alarm system
• 120V receptacle circuit
• 240V HVAC control

Rationale: Low voltage systems typically operate at 50 volts or less, such as

fire alarms, security, and telecommunications.

• What is the maximum voltage allowed for Class 2 circuits under NEC?

A. 50V

B. 75V

C. 60V

D. 100V

Rationale: NEC Class 2 circuits are limited to 60 volts to minimize shock

hazards.

• Which standard governs the installation of fire alarm systems in

commercial buildings?

A. NFPA 70

B. NFPA 72

C. NFPA 101

D. UL 508 1 / 3

Rationale: NFPA 72 provides installation, inspection, and maintenance

standards for fire alarm systems.

• What type of cable is commonly used for CATV installations?
• Twisted pair
• Coaxial
• Fiber optic
• RG-6 coaxial

Rationale: RG-6 coaxial cable is standard for CATV because of its

shielding and low signal loss.

• A low voltage contractor must have which of the following to legally

operate?

• General contractor license
• C-7 Low Voltage Systems license
• Electrical journeyman card
• Building permit

Rationale: A C-7 license specifically authorizes work on low voltage

systems in California.

• Which device converts an analog signal to a digital signal for

transmission over IP networks?

• Multiplexer
• Analog-to-digital converter (ADC)
• Router
• Transformer

Rationale: ADCs convert analog inputs (e.g., CCTV cameras) to digital

signals for processing and transmission.

• The minimum separation between low voltage communication wiring

and power wiring is typically:

• 0 inches
• 6 inches
• 12 inches
• 24 inches 2 / 3

Rationale: NEC requires separation to prevent interference and maintain

signal integrity.

• Which type of fiber optic cable is most commonly used for long-

distance telecommunication?

• Multimode
• Single-mode
• PVC jacketed
• Armored

Rationale: Single-mode fiber supports longer distances with less

attenuation than multimode fiber.

• What is the primary purpose of a surge protector in low voltage

systems?

• Increase voltage
• Protect equipment from voltage spikes
• Convert AC to DC
• Reduce current

Rationale: Surge protectors divert excess voltage to prevent equipment

damage.

• In a structured cabling system, horizontal cabling runs are limited

to what maximum length?

• 50 meters
• 90 meters
• 100 meters
• 110 meters

Rationale: ANSI/TIA-568 limits horizontal cabling to 90 meters to ensure

signal quality.

• Which tool is required to test continuity in low voltage circuits?
• Megohmmeter
• Clamp meter
• Multimeter
• Oscilloscope
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