The Ultimate California C-7 Low
Voltage Systems Contractor License
Exam Guide Practice Questions with
Verified Answers, Detailed Rationales,
and Code References for 2026
SECTION 1: LICENSE BASICS & DEFINITION (Question s 1-10)
Question 1
Which of the following is the primary purpose of the California C-7
contractor classification?
A) Installation of high-voltage transmission lines above 600 volts
B) Installation, alteration, and repair of low-voltage systems operating at 91
volts or less
C) Manufacturing and assembly of fire alarm control panels
D) Design and engineering of structural supports for satellite dishes
Correct Answer : B
Rationale: The CSLB C-7 classification specifically covers systems that
operate at 91 volts or less, such as communication, sound, and security
systems. The C-7 is a specialty contractor classification issued by the
California Contractors State License Board (CSLB) that authorizes a
,contractor to install, service, and maintain communication and low voltage
systems. The license falls under the Class C specialty contractor category
and is specifically defined in the California Code of Regulations Title 16,
Section 832.07 .
Question 2
What types of systems does a C-7 contractor typically work on?
A) High-voltage power distribution systems only
B) Telephone systems, sound systems, cable television, CCTV, satellite
dishes, instrumentation, temperature controls, and low voltage landscape
lighting
C) Medical equipment and diagnostic devices
D) Industrial manufacturing machinery
Correct Answer : B
Rationale: A C-7 contractor works on telephone systems, sound systems,
cable television systems, closed-circuit video systems, satellite dish
antennas, instrumentation and temperature controls, and low voltage
landscape lighting. The regulation explicitly lists these systems as within the
scope of the C-7 classification .
Question 3
What is the maximum voltage for systems covered by a C-7 license?
A) 24 volts
B) 50 volts
,C) 91 volts
D) 120 volts
Correct Answer : C
Rationale: The maximum voltage is 91 volts, and the systems must be
energy-limited. The CSLB defines low voltage systems for C-7 purposes as
those that are energy limited and do not exceed 91 volts. Per California
Code of Regulations Title 16, Section 832.07, a C-7 contractor installs,
services, or maintains systems operating at less than 91 volts (energy limit
not to exceed 500 Watts) .
Question 4
Are low voltage fire alarm systems included in the C-7 scope?
A) Yes, all fire alarm systems are included
B) No, low voltage fire alarm systems are specifically excluded
C) Yes, but only residential fire alarms
D) Only if they operate below 50 volts
Correct Answer : B
Rationale: Low voltage fire alarm systems are specifically excluded from
the C-7 classification. The regulation explicitly states that low voltage fire
alarm systems are not included in this section. Fire alarm systems typically
require separate licensing or specialization .
, Question 5
Which document primarily defines the allowable voltage for low-voltage
systems in California?
A) California Building Code
B) National Electrical Code (NEC) Article 725
C) Cal/OSHA Safety Standard 8-33-010
D) TIA-568-C Standard
Correct Answer : B
Rationale: NEC Article 725 specifically addresses low-voltage signaling and
communications systems, setting the maximum voltage at 91 V. The
California Electrical Code (CEC), based on the NEC with California
amendments, is Title 24 of the California Code of Regulations and governs
all electrical installations including low voltage systems in California .
Question 6
Does a C-7 license cover high-voltage electrical work?
A) Yes, all electrical work is covered
B) No, the C-7 license does not cover high-voltage electrical work
C) Yes, but only up to 240 volts
D) Only with special endorsement
Correct Answer : B
Rationale: The C-7 license does not cover high-voltage electrical work.
That requires a C-10 Electrical Contractor license. High-voltage electrical
work falls under the C-10 classification, not C-7 .
Voltage Systems Contractor License
Exam Guide Practice Questions with
Verified Answers, Detailed Rationales,
and Code References for 2026
SECTION 1: LICENSE BASICS & DEFINITION (Question s 1-10)
Question 1
Which of the following is the primary purpose of the California C-7
contractor classification?
A) Installation of high-voltage transmission lines above 600 volts
B) Installation, alteration, and repair of low-voltage systems operating at 91
volts or less
C) Manufacturing and assembly of fire alarm control panels
D) Design and engineering of structural supports for satellite dishes
Correct Answer : B
Rationale: The CSLB C-7 classification specifically covers systems that
operate at 91 volts or less, such as communication, sound, and security
systems. The C-7 is a specialty contractor classification issued by the
California Contractors State License Board (CSLB) that authorizes a
,contractor to install, service, and maintain communication and low voltage
systems. The license falls under the Class C specialty contractor category
and is specifically defined in the California Code of Regulations Title 16,
Section 832.07 .
Question 2
What types of systems does a C-7 contractor typically work on?
A) High-voltage power distribution systems only
B) Telephone systems, sound systems, cable television, CCTV, satellite
dishes, instrumentation, temperature controls, and low voltage landscape
lighting
C) Medical equipment and diagnostic devices
D) Industrial manufacturing machinery
Correct Answer : B
Rationale: A C-7 contractor works on telephone systems, sound systems,
cable television systems, closed-circuit video systems, satellite dish
antennas, instrumentation and temperature controls, and low voltage
landscape lighting. The regulation explicitly lists these systems as within the
scope of the C-7 classification .
Question 3
What is the maximum voltage for systems covered by a C-7 license?
A) 24 volts
B) 50 volts
,C) 91 volts
D) 120 volts
Correct Answer : C
Rationale: The maximum voltage is 91 volts, and the systems must be
energy-limited. The CSLB defines low voltage systems for C-7 purposes as
those that are energy limited and do not exceed 91 volts. Per California
Code of Regulations Title 16, Section 832.07, a C-7 contractor installs,
services, or maintains systems operating at less than 91 volts (energy limit
not to exceed 500 Watts) .
Question 4
Are low voltage fire alarm systems included in the C-7 scope?
A) Yes, all fire alarm systems are included
B) No, low voltage fire alarm systems are specifically excluded
C) Yes, but only residential fire alarms
D) Only if they operate below 50 volts
Correct Answer : B
Rationale: Low voltage fire alarm systems are specifically excluded from
the C-7 classification. The regulation explicitly states that low voltage fire
alarm systems are not included in this section. Fire alarm systems typically
require separate licensing or specialization .
, Question 5
Which document primarily defines the allowable voltage for low-voltage
systems in California?
A) California Building Code
B) National Electrical Code (NEC) Article 725
C) Cal/OSHA Safety Standard 8-33-010
D) TIA-568-C Standard
Correct Answer : B
Rationale: NEC Article 725 specifically addresses low-voltage signaling and
communications systems, setting the maximum voltage at 91 V. The
California Electrical Code (CEC), based on the NEC with California
amendments, is Title 24 of the California Code of Regulations and governs
all electrical installations including low voltage systems in California .
Question 6
Does a C-7 license cover high-voltage electrical work?
A) Yes, all electrical work is covered
B) No, the C-7 license does not cover high-voltage electrical work
C) Yes, but only up to 240 volts
D) Only with special endorsement
Correct Answer : B
Rationale: The C-7 license does not cover high-voltage electrical work.
That requires a C-10 Electrical Contractor license. High-voltage electrical
work falls under the C-10 classification, not C-7 .
