CALIFORNIA LOW VOLTAGE SYSTEMS CONTRACTOR (C-7) LICENSE EXAM PRACTICE TEST
QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A
|STUDY GUIDE| INSTANT DOWNLOAD PDF
Core Domains
- Job Planning and Design
- Material Selection and Estimation
- Wire/Cable Installation and Termination
- Systems Configuration and Installation
- Testing and Project Closeout
- System Troubleshooting, Repairs, or Replacements
- Safety and Cal/OSHA Regulations
- Regulatory and Legal Compliance (NEC, CEC, NFPA)
This practice exam is designed to prepare candidates for the California Low Voltage Systems Contractor (C-7)
License Examination administered by the Contractors State License Board (CSLB). The exam assesses critical
skills and knowledge required to professionally install, test, troubleshoot, and maintain low voltage systems
operating at 50 volts or less. Topics include job planning, material estimation, cable installation, system
configuration (satellite, CCTV, data, fiber optics, audio/video, building automation), testing procedures,
troubleshooting, and safety compliance. The assessment uses multiple-choice and scenario-based questions
that emphasize real-world application, technical decision-making, code compliance, and ethical professional
standards. Success requires both foundational theory and applied competency in field conditions.
Section One: Questions 1–100
Question 1
Which of the following is considered a low voltage system under California C-7 licensing scope?
,A. 480V three-phase industrial power system
B. 24V fire alarm control circuit
C. 120V residential receptacle circuit
D. 240V HVAC compressor line
🟢 Correct answer: B
🔴 RATIONALE: Low voltage systems typically operate at 50 volts or less. A 24V fire alarm circuit falls within
this range and is explicitly covered under C-7 scope, whereas 120V+, 240V+, and 480V systems require higher-
level electrical licenses (C-10).
Question 2
What is the maximum voltage allowed for NEC Class 2 circuits to minimize shock hazards?
A. 50V
B. 60V
C. 75V
D. 100V
🟢 Correct answer: B
🔴 RATIONALE: NEC Article 725 specifies that Class 2 circuits are limited to 60 volts maximum. This
limitation reduces shock and fire hazards while permitting safe operation of low power devices like security
sensors and communication equipment.
,Question 3
A low voltage contractor needs to wire 30 offices with Cat 6 cable. The average distance from the IT room to
each office is 280 feet. How many 1,000-foot boxes of cable are required?
A. 8
B. 9
C. 10
D. 11
🟢 Correct answer: D
🔴 RATIONALE: Total cable needed = 30 offices × 280 ft = 8,400 ft. Each box contains 1,000 ft, so 8,400 ÷
1,000 = 8.4 boxes. Since partial boxes cannot be purchased, round up to 9 boxes. However, accounting for
termination waste (~10%), add 840 ft, totaling 9,240 ft → 9.24 boxes → round up to 10 boxes. Conservative
industry practice adds extra for pulls and errors, yielding 11 boxes as the BEST answer.
Question 4
Which wire type should be used to cross-connect a standard 4-wire telephone connection?
A. 18 AWG stranded
B. 18 AWG solid
C. 24 AWG stranded
D. 24 AWG solid
🟢 Correct answer: A
, 🔴 RATIONALE: 18 AWG stranded wire is standard for telephone cross-connects due to its flexibility for
frequent handling and sufficient conductivity for low current voice signals. Solid wire is too stiff for patch
panels, and 24 AWG is too thin for reliable telephone connections.
Question 5
What type of jack is used on a Cat 6 cable installation for data networks?
A. RJ-11
B. RJ-14
C. RJ-21
D. RJ-45
🟢 Correct answer: D
🔴 RATIONALE: RJ-45 is the standard connector for Cat 5/5e/6/6A Ethernet data cables. RJ-11 and RJ-14 are
used for telephone, while RJ-21 is for multi-pair telephone applications.
Question 6
Which code primarily governs low voltage electrical installations in California?
A. International Building Code
B. California Electrical Code (CEC)
C. OSHA Safety Standards
D. NFPA 70E
🟢 Correct answer: B
QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A
|STUDY GUIDE| INSTANT DOWNLOAD PDF
Core Domains
- Job Planning and Design
- Material Selection and Estimation
- Wire/Cable Installation and Termination
- Systems Configuration and Installation
- Testing and Project Closeout
- System Troubleshooting, Repairs, or Replacements
- Safety and Cal/OSHA Regulations
- Regulatory and Legal Compliance (NEC, CEC, NFPA)
This practice exam is designed to prepare candidates for the California Low Voltage Systems Contractor (C-7)
License Examination administered by the Contractors State License Board (CSLB). The exam assesses critical
skills and knowledge required to professionally install, test, troubleshoot, and maintain low voltage systems
operating at 50 volts or less. Topics include job planning, material estimation, cable installation, system
configuration (satellite, CCTV, data, fiber optics, audio/video, building automation), testing procedures,
troubleshooting, and safety compliance. The assessment uses multiple-choice and scenario-based questions
that emphasize real-world application, technical decision-making, code compliance, and ethical professional
standards. Success requires both foundational theory and applied competency in field conditions.
Section One: Questions 1–100
Question 1
Which of the following is considered a low voltage system under California C-7 licensing scope?
,A. 480V three-phase industrial power system
B. 24V fire alarm control circuit
C. 120V residential receptacle circuit
D. 240V HVAC compressor line
🟢 Correct answer: B
🔴 RATIONALE: Low voltage systems typically operate at 50 volts or less. A 24V fire alarm circuit falls within
this range and is explicitly covered under C-7 scope, whereas 120V+, 240V+, and 480V systems require higher-
level electrical licenses (C-10).
Question 2
What is the maximum voltage allowed for NEC Class 2 circuits to minimize shock hazards?
A. 50V
B. 60V
C. 75V
D. 100V
🟢 Correct answer: B
🔴 RATIONALE: NEC Article 725 specifies that Class 2 circuits are limited to 60 volts maximum. This
limitation reduces shock and fire hazards while permitting safe operation of low power devices like security
sensors and communication equipment.
,Question 3
A low voltage contractor needs to wire 30 offices with Cat 6 cable. The average distance from the IT room to
each office is 280 feet. How many 1,000-foot boxes of cable are required?
A. 8
B. 9
C. 10
D. 11
🟢 Correct answer: D
🔴 RATIONALE: Total cable needed = 30 offices × 280 ft = 8,400 ft. Each box contains 1,000 ft, so 8,400 ÷
1,000 = 8.4 boxes. Since partial boxes cannot be purchased, round up to 9 boxes. However, accounting for
termination waste (~10%), add 840 ft, totaling 9,240 ft → 9.24 boxes → round up to 10 boxes. Conservative
industry practice adds extra for pulls and errors, yielding 11 boxes as the BEST answer.
Question 4
Which wire type should be used to cross-connect a standard 4-wire telephone connection?
A. 18 AWG stranded
B. 18 AWG solid
C. 24 AWG stranded
D. 24 AWG solid
🟢 Correct answer: A
, 🔴 RATIONALE: 18 AWG stranded wire is standard for telephone cross-connects due to its flexibility for
frequent handling and sufficient conductivity for low current voice signals. Solid wire is too stiff for patch
panels, and 24 AWG is too thin for reliable telephone connections.
Question 5
What type of jack is used on a Cat 6 cable installation for data networks?
A. RJ-11
B. RJ-14
C. RJ-21
D. RJ-45
🟢 Correct answer: D
🔴 RATIONALE: RJ-45 is the standard connector for Cat 5/5e/6/6A Ethernet data cables. RJ-11 and RJ-14 are
used for telephone, while RJ-21 is for multi-pair telephone applications.
Question 6
Which code primarily governs low voltage electrical installations in California?
A. International Building Code
B. California Electrical Code (CEC)
C. OSHA Safety Standards
D. NFPA 70E
🟢 Correct answer: B
