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California Low Voltage Systems Contractor (C-7)
License Exam QUESTIONS AND DETAILED
SOLUTIONS JUST RELEASED
California Low Voltage Systems Contractor (C-7) License Exam
Point-Form Exam Coverage
Based on the official CSLB Study Guide and industry standards, the C-7 exam is divided into two main
sections: Trade (115 questions) and Law & Business (115 questions), each allotted 3 hours . The exam is
closed-book, and a calculator is provided .
C-7 TRADE EXAM CONTENT (115 questions)
1. Job Planning & Design (18-19%)
• Interpreting plans, specifications, and industry standard symbols (e.g., "C-T" = cable tray)
• Planning wire routes and equipment locations for low voltage systems
• Understanding NEC Articles 725 (Class 2/3), 760 (Fire Alarm), 770 (Fiber Optic), and 800
(Communications)
• Coordination with other trades (fire alarm, electrical, HVAC)
• TIA/EIA structured cabling standards (TIA-568, TIA-569)
2. Material Selection & Estimation (15-18%)
• Low voltage cable types: Cat 5e, Cat 6, Cat 6A, Cat 7, coaxial (RG-6), fiber optic (single-mode,
multimode)
• Connectors: RJ-45, RJ-11, RJ-14, RJ-21, BNC, F-connector, fiber connectors (ST, SC, LC)
• Tools: cable testers, toners, continuity testers, optical power meters, fusion splicers
• Estimating cable lengths using pull factor (1.25× measured distance)
• Conduit fill calculations (40% maximum fill for cables >1 in²)
3. Wire/Cable Installation & Termination (11-12%)
• Cable tray installation and support spacing (max 10 ft vertical rise between supports)
• Pulling tension and bend radius limits (10× cable diameter for fiber, 4× for copper)
• Termination methods: punch-down blocks (110, 66 blocks), modular jacks, fiber termination
(cleave & polish)
• Labeling schemes per TIA-606
• Fire rating requirements: CMP (plenum), CMR (riser), CM (general purpose), LSZH
4. Systems Configuration & Installation (15-16%)
• Equipment room components: racks, patch panels, cable managers
• System types: CCTV, VoIP, building automation, access control, satellite (LNB), audio/video, fire
alarm
• Structured cabling: backbone (vertical), horizontal, work area
• IP networking basics: PoE standards (802.3af = 15.4W, 802.3at = 30W)
• Fiber optic system components: transceivers, patch panels, splice closures
5. Testing & Project Closeout (12-17%)
• Continuity testing (0 Ω indicates closed circuit)
• Optical loss testing (power meter + light source requires index of refraction for calibration)
• Time Domain Reflectometer (TDR) and Optical TDR (OTDR) for locating faults
• Documentation requirements: as-built drawings, test results, warranty information
• Owner training requirements
6. System Troubleshooting & Repair (7-8%)
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•Voltage drop calculations (dependent on length, cross-sectional area, current)
•Identifying intermittent failures: loose connections, corrosion, EMI interference
•Common CCTV issues: insufficient illumination (minimum 1 lux for night parking lots)
7. Safety (15-17%)
• Cal/OSHA regulations (Title 8)
• Injury and Illness Prevention Program (IIPP): hazard identification and correction procedures
required
• Ladder safety, trenching, lock-out/tag-out
• Personal Protective Equipment (PPE)
• Separation requirements: minimum 12 inches between fire alarm and communication cables
per NEC 800.154
LAW & BUSINESS EXAM CONTENT (115 questions)
• Contract Requirements: Written contract required for work over $500; must include license
number, scope of work, payment schedule
• Licensing Requirements: C-7 license covers systems up to 91 volts; $15,000 CSLB bond required
• Business Organizations: Sole proprietorship, partnership, LLC, corporation; LLC provides
greatest personal liability protection
• Employment Requirements: Payroll taxes filed with California EDD
• Public Works / Prevailing Wage: Applies to public works contracts over $5,000
• Mechanics' Liens: Material includes both labor and materials; lien waivers required before final
payment
• Safety & OSHA: Cal/OSHA standards, IIPP requirements
• Workers' Compensation: Required for all employees (exemption possible for sole owners with
no employees)
Question 1
A low voltage contractor needs to wire 25 offices with Cat 6 voice and data. The distance between the IT
room and the offices averages 250 feet. How many 1,000-foot boxes of cable will the contractor need?
A) 7
B) 8
C) 12
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D) 13
Answer: D
*Each run requires 250 ft × 25 runs = 6,250 ft. Adding 10-15% waste and pull factor, 13 boxes × 1,000 ft
= 13,000 ft, which provides sufficient cable for 25 runs including slack, service loops, and termination
waste .*
Question 2
When testing a fiber optic cable, what parameter must be known to calibrate the test equipment before
performing an optical loss test?
A) The capacitance of the fiber
B) The index of refraction of the fiber
C) The splice loss estimate
D) The impedance of the cable
Answer: B
The index of refraction determines the velocity of light propagation in the fiber, which is required to
calibrate an OTDR or optical loss test set for accurate distance measurements .
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Question 3
What type of jack should be used on a Cat 6 cable installation in a commercial office building?
A) RJ-11
B) RJ-14
C) RJ-21
D) RJ-45
Answer: D
*RJ-45 is the standard 8-position 8-contact (8P8C) modular connector used for Ethernet Cat 5e, Cat 6,
and Cat 6A cabling in data networks .*
Question 4
Which wire should be used to cross-connect a standard residential telephone connection at the
demarcation point?
A) 18 AWG stranded
B) 18 AWG solid
C) 24 AWG stranded
D) 24 AWG solid
California Low Voltage Systems Contractor (C-7)
License Exam QUESTIONS AND DETAILED
SOLUTIONS JUST RELEASED
California Low Voltage Systems Contractor (C-7) License Exam
Point-Form Exam Coverage
Based on the official CSLB Study Guide and industry standards, the C-7 exam is divided into two main
sections: Trade (115 questions) and Law & Business (115 questions), each allotted 3 hours . The exam is
closed-book, and a calculator is provided .
C-7 TRADE EXAM CONTENT (115 questions)
1. Job Planning & Design (18-19%)
• Interpreting plans, specifications, and industry standard symbols (e.g., "C-T" = cable tray)
• Planning wire routes and equipment locations for low voltage systems
• Understanding NEC Articles 725 (Class 2/3), 760 (Fire Alarm), 770 (Fiber Optic), and 800
(Communications)
• Coordination with other trades (fire alarm, electrical, HVAC)
• TIA/EIA structured cabling standards (TIA-568, TIA-569)
2. Material Selection & Estimation (15-18%)
• Low voltage cable types: Cat 5e, Cat 6, Cat 6A, Cat 7, coaxial (RG-6), fiber optic (single-mode,
multimode)
• Connectors: RJ-45, RJ-11, RJ-14, RJ-21, BNC, F-connector, fiber connectors (ST, SC, LC)
• Tools: cable testers, toners, continuity testers, optical power meters, fusion splicers
• Estimating cable lengths using pull factor (1.25× measured distance)
• Conduit fill calculations (40% maximum fill for cables >1 in²)
3. Wire/Cable Installation & Termination (11-12%)
• Cable tray installation and support spacing (max 10 ft vertical rise between supports)
• Pulling tension and bend radius limits (10× cable diameter for fiber, 4× for copper)
• Termination methods: punch-down blocks (110, 66 blocks), modular jacks, fiber termination
(cleave & polish)
• Labeling schemes per TIA-606
• Fire rating requirements: CMP (plenum), CMR (riser), CM (general purpose), LSZH
4. Systems Configuration & Installation (15-16%)
• Equipment room components: racks, patch panels, cable managers
• System types: CCTV, VoIP, building automation, access control, satellite (LNB), audio/video, fire
alarm
• Structured cabling: backbone (vertical), horizontal, work area
• IP networking basics: PoE standards (802.3af = 15.4W, 802.3at = 30W)
• Fiber optic system components: transceivers, patch panels, splice closures
5. Testing & Project Closeout (12-17%)
• Continuity testing (0 Ω indicates closed circuit)
• Optical loss testing (power meter + light source requires index of refraction for calibration)
• Time Domain Reflectometer (TDR) and Optical TDR (OTDR) for locating faults
• Documentation requirements: as-built drawings, test results, warranty information
• Owner training requirements
6. System Troubleshooting & Repair (7-8%)
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•Voltage drop calculations (dependent on length, cross-sectional area, current)
•Identifying intermittent failures: loose connections, corrosion, EMI interference
•Common CCTV issues: insufficient illumination (minimum 1 lux for night parking lots)
7. Safety (15-17%)
• Cal/OSHA regulations (Title 8)
• Injury and Illness Prevention Program (IIPP): hazard identification and correction procedures
required
• Ladder safety, trenching, lock-out/tag-out
• Personal Protective Equipment (PPE)
• Separation requirements: minimum 12 inches between fire alarm and communication cables
per NEC 800.154
LAW & BUSINESS EXAM CONTENT (115 questions)
• Contract Requirements: Written contract required for work over $500; must include license
number, scope of work, payment schedule
• Licensing Requirements: C-7 license covers systems up to 91 volts; $15,000 CSLB bond required
• Business Organizations: Sole proprietorship, partnership, LLC, corporation; LLC provides
greatest personal liability protection
• Employment Requirements: Payroll taxes filed with California EDD
• Public Works / Prevailing Wage: Applies to public works contracts over $5,000
• Mechanics' Liens: Material includes both labor and materials; lien waivers required before final
payment
• Safety & OSHA: Cal/OSHA standards, IIPP requirements
• Workers' Compensation: Required for all employees (exemption possible for sole owners with
no employees)
Question 1
A low voltage contractor needs to wire 25 offices with Cat 6 voice and data. The distance between the IT
room and the offices averages 250 feet. How many 1,000-foot boxes of cable will the contractor need?
A) 7
B) 8
C) 12
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D) 13
Answer: D
*Each run requires 250 ft × 25 runs = 6,250 ft. Adding 10-15% waste and pull factor, 13 boxes × 1,000 ft
= 13,000 ft, which provides sufficient cable for 25 runs including slack, service loops, and termination
waste .*
Question 2
When testing a fiber optic cable, what parameter must be known to calibrate the test equipment before
performing an optical loss test?
A) The capacitance of the fiber
B) The index of refraction of the fiber
C) The splice loss estimate
D) The impedance of the cable
Answer: B
The index of refraction determines the velocity of light propagation in the fiber, which is required to
calibrate an OTDR or optical loss test set for accurate distance measurements .
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Question 3
What type of jack should be used on a Cat 6 cable installation in a commercial office building?
A) RJ-11
B) RJ-14
C) RJ-21
D) RJ-45
Answer: D
*RJ-45 is the standard 8-position 8-contact (8P8C) modular connector used for Ethernet Cat 5e, Cat 6,
and Cat 6A cabling in data networks .*
Question 4
Which wire should be used to cross-connect a standard residential telephone connection at the
demarcation point?
A) 18 AWG stranded
B) 18 AWG solid
C) 24 AWG stranded
D) 24 AWG solid
