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Peerless Study Guide Book: Low Voltage Systems (C-7)
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CSLB Low Voltage Systems (C-7): Study Guide

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Promo pricing through September 30, 2026.

What this book covers

The Peerless Low Voltage Systems (C-7) Study Guide Book prepares you for the trade portion of the California CSLB contractor license exam. 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. This printed book covers the subjects the state tests. See the official CSLB C7 classification.


Book chapters

  1. Transformers
  2. Safety
  3. Electrical symbols
  4. Switches & controlling electricity
  5. Mathematics review

Sample questionsTry our free practice test

  1. FTTC stands for:
    A. Fiber to the current · B. Fiber to the circuit · C. Fiber to the curb ✓ · D. Fiber to the CATV
  2. Why do you need Category 5e instead of Category 5?
    A. For greater strength for long pulls · B. To futureproof your network · C. For isolation in industrial networks · D. To run Gigabit Ethernet ✓
  3. Copper networks can be converted to fiber networks by using:
    A. Patch panels · B. Media converters ✓ · C. Rewiring · D. Fiber hubs

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California contractors who passed

Not many books exist for C-7. This one covered the material and I passed on my first attempt.

Sergei Valley Village, CA  · Low Voltage Systems (C-7)

Two exams and both passed. The C-7 material is hard to find, and the wiring and system diagrams were the most useful part.

Neil Temecula, CA  · Law & Business; Low Voltage Systems (C-7)