CSLB C-7 Low Voltage Systems (Trade Exam) Practice Test
| Administering body | Contractors State License Board (CSLB), California Department of Consumer Affairs — exam delivered by PSI Services LLC |
|---|---|
| Questions | Not published by CSLB What we read and found nothing in: CSLB — Step 7: Studying for the Examination |
| Time limit | 210 minutes |
| Passing score | Not published by CSLB What we read and found nothing in: CSLB — Step 7: Studying for the Examination |
| Fees |
Source: CSLB — List of All CSLB Fees |
| Languages offered | English |
Frequently asked questions
How many CSLB Trade — Low Voltage Systems (C-7) practice questions are here?+
A full bank of original CSLB Trade — Low Voltage Systems (C-7) practice questions across the official content areas, weighted like the real exam, with explanations. Free, no signup.
What is the CSLB Trade — Low Voltage Systems (C-7) exam like?+
A multiple-choice exam, 210 minutes. Practice by topic here, then take the full timed mock exam to gauge readiness.
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No. Every question is 100% original, written from public primary sources with explanations. We never copy real exam questions or paid prep material.
Can I study in Chinese or Spanish?+
PrepPass practice is in English, 中文 and Español. The official exam is in English — switch the question language to English any time to rehearse the exact terminology you'll see on test day.
Sample practice questions
A few sample questions from this free bank, with full explanations. Use the practice tool above for the whole set.
- 1. Job Planning and Design
What voltage ceiling appears in the CSLB's definition of the C-7 Low Voltage Systems classification?
- a.120 volts
- b.91 volts
- c.50 volts
- d.600 volts
Answer: b
Explanation: The C-7 definition covers energy-limited communication and low voltage systems that do not exceed 91 volts. Fifty volts is a Cal/OSHA work-practice threshold, not the license limit; 120 volts is ordinary branch-circuit voltage; and 600 volts is the dividing line used in some safety rules, not the C-7 scope.
Source: Cal. Code Regs. tit. 16 §832.07 (C-7 classification, CSLB)
- 2. Job Planning and Design
Communications cable and power conductors share a pole. Where does the safety order place the communications cable, where practicable?
- a.On the same crossarm as the power
- b.Below the power conductors
- c.Above the power conductors
- d.Inside the power conductors' conduit
Answer: b
Explanation: Where practicable, communications wires and cables on poles are located below the electric light or power conductors, and they may not be attached to a crossarm that carries power conductors. Placing them above power, on the power crossarm, or in a power conduit all contradict the rule.
Source: Cal. Code Regs. tit. 8 §2587.3 (conductor location)
- 3. Material Selection and Estimation
What jacket color does the TIA-598 scheme in the federal criterion assign to OM4 multimode fiber?
- a.Yellow
- b.Orange
- c.Slate
- d.Violet
Answer: d
Explanation: The criterion's table lists OM4 as violet or aqua. Yellow is single-mode, orange is legacy OM2, and slate is legacy OM1.
Source: UFC 3-580-01 (2024), Table 2-3 (fiber jacket colors)
- 4. Material Selection and Estimation
Above what combined labor and material cost must a California home improvement job be in a written contract, per the CSLB?
- a.$5,000
- b.$1,000
- c.$250
- d.$500
Answer: d
Explanation: The CSLB says the terms of all home improvement projects over $500 in combined material and labor costs must be in a contract. One thousand dollars is the licensing threshold for small jobs, $5,000 is not a contract threshold, and $250 is below the stated amount.
Source: CSLB, Terms of Agreement: A Consumer Guide to Home Improvement Contracts
- 5. Wire/Cable Installation and Termination
How deep does the federal criterion place warning tape above underground communications conduit?
- a.At least 12 inches below the surface
- b.Directly on top of the conduit
- c.At the surface, as a visible marker
- d.At least 48 inches below the surface
Answer: a
Explanation: Warning tape is installed at least 12 inches below the surface and kept at least 6 inches above the conduit or cable. At the surface it is not a buried warning, directly on the conduit gives no warning before an excavator reaches it, and 48 inches is the minimum cover for directly buried fiber.
Source: UFC 3-580-01 (2024), para. 3-6.9.2 (warning tape)
- 6. Systems Configuration and Installation
A camera must look out through a window. How should it be mounted, per the federal security criterion?
- a.With the room lights on behind it
- b.Angled to see its own reflection for alignment
- c.With the lens positioned close to the glass
- d.As far back from the glass as possible
Answer: c
Explanation: The criterion says that behind glass the lens should be close to the glass, or reflections of the camera and background appear in the image. Mounting far back, angling toward the reflection, or lighting the room behind the camera all increase reflections.
Source: UFC 4-021-02 (2025), para. 5-2.3 (outdoor cameras)
- 7. Systems Configuration and Installation
An office moves its IP phones between floors and buildings freely. What emergency-calling concern does NIST raise?
- a.VoIP phones need battery power to dial 911
- b.911 calls cannot be placed over VoIP
- c.E-911 automatic location may be unavailable
- d.E-911 requires an analog fax line
Answer: c
Explanation: NIST notes that E-911 automatic location service is not available with VoIP in some cases, because a number is not tied to a physical location. VoIP can place 911 calls, battery power is unrelated to dialing, and E-911 is not limited to fax lines.
Source: NIST SP 800-58, Security Considerations for VoIP Systems
- 8. Testing and Project Closeout
Besides pass/fail status, what must the test summary spreadsheet include for failed links under the federal criterion?
- a.The installer's hourly rate
- b.The cable's purchase price
- c.The tester's serial number only
- d.The causes for failures
Answer: d
Explanation: The summary includes room numbers, outlet and jack labels, pass/fail status and causes for failures, with totals installed, passed and failed. Labor rates and purchase prices are not test data, and a serial number alone says nothing about why a link failed.
Source: UFC 3-580-01 (2024), para. 2-6.5 (test plan)
- 9. System Troubleshooting, Repairs, or Replacements
High-power PoE cameras on a bundle of 60 cables show rising errors in summer. What change addresses the cause?
- a.Wrap the bundle in insulation to stabilize it
- b.Unbundle the cables into loose basket tray
- c.Add more cable ties to tighten the bundle
- d.Replace the PoE switch with a faster one
Answer: b
Explanation: Bundles heat under PoE; the criterion cites guidance that bundles should not exceed 24 cables and notes that unbundled cable in wire basket gets enough airflow, and cables may not exceed their temperature ratings. Tighter ties and insulation trap more heat, and a faster switch does not cool the cable.
Source: UFC 3-580-01 (2024), para. 2-3.3.5 (bundling)
- 10. Safety
What must be done with an aerial lift's controls before use?
- a.Disable the emergency stop for smoother work
- b.Nothing, if the lift was used yesterday
- c.Have the building owner sign them off
- d.Test them per the maker
Answer: d
Explanation: Lift controls must be tested in accordance with the manufacturer's recommendations or instructions prior to use. Prior use does not excuse the check, disabling an emergency stop is unsafe, and the owner's signature is not the required test.
Source: Cal. Code Regs. tit. 8 §3648 (aerial devices)