What License Does a Telecommunications Contractor Need in California? How to Install Low Voltage Systems Legally in San Jose, CA
Most telecommunications contractors in California need a C-7 Low Voltage Systems license from the Contractors State License Board (CSLB). Licensed electrical contractors with a C-10 license can also perform this work.
The C-7 classification covers the communication and low voltage systems a telecommunications contractor installs, from telephone and data cabling to sound and video systems. Before you hire a Telecommunications Contractor in San Jose, CA, it helps to know which license applies, what it covers and what a contractor had to do to earn it.
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Request a quoteThe C-7 Low Voltage Systems License Explained
The CSLB defines the C-7 Low Voltage Systems contractor as one who installs, services and maintains communication and low voltage systems that are energy-limited and don’t exceed 91 volts. The classification lists systems such as telephone, sound, cable television, closed-circuit video, satellite dish antennas and instrumentation and temperature controls.
In practice, that covers most of what a telecommunications contractor does: installing network and fiber cabling, building out telecom rooms, connecting phones and paging, mounting Wi-Fi access points and wiring cameras and access control.
There’s one notable exclusion. Low voltage fire alarm systems are specifically left out of the C-7 classification. Fire alarm work is typically handled by licensed electrical contractors.
Work a C-7 License Covers
These are the kinds of systems a C-7 licensed telecommunications contractor typically installs.
- Telephone and VoIP phone cabling
- Data and network cabling, including copper and fiber
- Telecom rooms, racks and patch panels
- Wi-Fi access point cabling and mounting
- Paging, sound and intercom systems
- Security camera (closed-circuit video) cabling
- Access control wiring to readers and door hardware
- Audio visual and cable TV systems
California Licenses That Allow Telecommunications Work
The C-7 is the most common license for this trade, but it isn’t the only one that can apply.
| License | Classification | Telecommunications work it allows | Typical holder |
|---|---|---|---|
| C-7 | Low Voltage Systems | Communication and low voltage systems up to 91 volts, excluding fire alarms | Telecommunications and low voltage contractors |
| C-10 | Electrical | All electrical work, including low voltage and fire alarm systems | Electrical contractors |
| A | General Engineering | Engineering projects such as underground conduit and outside plant construction | Telecommunications construction companies |
| B | General Building | Low voltage work as part of a larger project involving multiple building trades | General contractors |
What It Takes to Get a C-7 License
Holding a C-7 license means a contractor has met the CSLB’s requirements, not just filled out a form.
Experience
At least four years of journey-level experience in the trade within the last 10 years, verified by the CSLB.
Exams
Passing both the Law and Business exam and the C-7 trade exam.
Bond
A contractor’s bond on file with the CSLB, currently $25,000.
Insurance
Workers’ compensation coverage as required by law, which applies to any contractor with employees.
California also has a narrow exemption for very small jobs below a set dollar limit that don’t require a permit. Anything beyond that requires a licensed contractor, so check the CSLB website for the current threshold.
When Licensing Comes Up on San Jose Projects
License requirements show up at different points depending on the job.
Downtown office towers
Building management approval
Property managers commonly ask for a contractor’s license number and insurance certificate before allowing work in the building.
Tenant improvements
General contractor projects
On larger remodels, the general contractor typically hires a licensed C-7 subcontractor for the cabling scope.
Public schools
District bids
School districts usually require the right license classification to bid, along with any public works requirements.
Fire alarm upgrades
Separate license needed
When a project includes fire alarm wiring, that part goes to a licensed electrical contractor, even if a C-7 contractor handles the rest.
The Devices Licensed Contractors Install
A C-7 license covers the cabling and connections behind the equipment businesses use every day, including phones, access points, switches, cameras and video systems. Our guide What Is an Example of a Telecommunications Device explains the most common ones and how each is connected.
Choosing a Properly Licensed Telecommunications Contractor
In California, a telecommunications contractor typically needs a C-7 Low Voltage Systems license from the CSLB, while electrical contractors with a C-10 license may also do this work. Fire alarm systems fall outside the C-7, and outside plant construction usually involves a Class A license.
A license is only useful if it’s active and in good standing. Our guide How Do I Verify a Telecommunications Contractor’s License in California shows how to check it in a few minutes.
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