CSLB Low Voltage Systems (C-7): Online Practice Exam

What this exam covers

Practice questions for the California CSLB Low Voltage Systems (C-7) license exam, delivered online and graded instantly. Per the state's classification, a C-7 contractor installs, maintains, tests, and repairs systems that use 91 volts or less, including telephone, data, video, intercom, alarm, and control wiring systems. Works on any device, including iPad. See the official CSLB C7 classification.

Updated July 2026 · 2022 CA Codes · 782 Questions · Topic Practice

• Content Last Updated: July 24, 2026
• Code Basis: 2022 California Codes
• Question Count: 782 practice questions
• Organized By: CSLB study-guide topic categories
• Includes: This practice exam has been updated using Peerless’s vetted usable question set. Questions are organized by CSLB study-guide topic categories and include answer explanations to support full-exam review and focused topic practice. Each topic has a mini-exam to help you develop mastery.

Sample questions — Try our free practice test

1. A convenient unit of measurement to compare the resistance and size of one conductor with another is the:
   ✓ A. ohm · B. mil-foot · C. wattage · D. voltage drop
2. A GFCI breaker or receptacle will open a circuit where there is a current leakage to ground fault of:
   A. .06 · ✓ B. .006 · C. .6 · D. .2
3. A megohmmeter is used to test insulation resistance because it provides a:
   ✓ A. higher potential than an ohmmeter · B. multiple path for resistance · C. convenient means of recording resistance · D. wide range of resistance taps
4. Electrical circuit lines are drawn curved rather than straight:
   A. to allow the drafters to route the lines around the partitions · B. to show that curved lines are not as difficult to draw on CAD systems as straight lines · C. to show how conduit is installed · ✓ D. not to confuse the circuit lines with the building lines
5. For a family residence with 5000 sq. ft. all electric, how many amps are needed?
   A. 100 · B. 200 · ✓ C. 300 · D. 400