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C-07 Low Voltage
 
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C07 – Low Voltage Systems Contractor

A communication and low voltage contractor installs, services and maintains all types of communication and low voltage systems which are energy limited and do not exceed 91 volts. These systems include, but are not limited to telephone systems, sound systems, cable television systems, closed-circuit video systems, satellite dish antennas, instrumentation and temperature controls, and low voltage landscape lighting. Low voltage fire alarm systems are specifically not included in this section.

Authority cited: Sections 7008 and 7059, Reference: Sections 7058 and 7059 (Business and Professions Code)

Content of the Examination

The Low Voltage Systems (C-7) Examination is divided into four major sections. These sections are:

1. Pre-Installation, Coordination, & Design (15%)

  • Interpretation and application of plans for low voltage systems
  • Compliance with codes
  • Coordination with owner, architect, & other trades

2. Installation of Low Voltage Systems (48%)

  • Pre-wiring
  • Installation of various low voltage systems (e.g., fiber optic, voice, and data, cable TV/satellite)
  • Testing methods and testing equipment

3. Troubleshooting Low Voltage Systems (13%)

  • Troubleshooting
  • Repair/Replacement of low voltage systems and components

4. Safety (24%)

  • Identification of work site hazards
  • Safe work practices

*Percentages are approximate*


Test Site Policy
   This is a closed-book examination. No reference materials may be used during the examination. All materials brought to the examination site must be left in an unmonitored area at your own risk.

Test Strategy
   This is a multiple choice examination with four choices per question. Some questions require mathematical computation. Examination questions are written to provide only one BEST answer and are NOT written as trick questions.
   All correct answers have equal value and there are no score reductions for wrong answers. Therefore, all examination questions should be answered.
   Ample time is provided to answer all examination questions, so be sure to read each question and its four choices completely and carefully before selecting the BEST possible answer to the question.



Sample Questions

The following questions are typical of the types of items that are on the examination. The correct answer is highlighted.

1. What is the proportional relationship between conductor length and conductor size?

  1. resistance
  2. impedance
  3. capacitance
  4. attenuation

2. When running low voltage cables in a ceiling that is being used for air handling, what type of cable should be installed?

  1. fiber-optic cable
  2. shielded cable
  3. PVC-jacketed cable
  4. plenum-rated cable

3. What are the general wiring requirements for a 70 volt background music-only sound system with minimal voltage drop?

  1. one pair of No. 14 AWG wire
  2. one pair of No. 16 AWG wire
  3. one pair of No. 18 AWG wire
  4. one pair of No. 22 AWG wire

*All questions are written and reviewed by licensed contractors who are actively working in the field*


Resources
American Electricians' Handbook.
McGraw-Hill, Inc.
1221 Avenue of the Americas,
New York, NY 10020.
INTERNET: www.mcgraw-hill.com

California Building Code.
International Conference of Building Officials,
5360 Workman Mill Road,
Whittier, CA 90601-2298.
(800) 284-4406. FAX: (888) 329-4226.
INTERNET: www.icbo.org

Cal/OSHA Construction Safety Orders.
California Code of Regulations, Title 8, Industrial Relations, Division 1, Chapter 4, Subchapter 4
Barclays Law Publishers,
P.O. Box 95767, Chicago, IL 60694.
(800) 888-3600. FAX: (415) 732-8875.
OR Building News, Inc.
1612 S. Clementine Street, Anaheim, CA 92802.
(800) 873-6397 or FAX: (714) 535-8078
INTERNET: ccr.oal.ca.gov/cgi-bin/om_isapi.dll or www.bni-books.com

Cedia Guide to Home Networking.
Custom Electronic Design & Installaion Association,
(800) 669-5329.
INTERNET: www.cedia.org

Modern Residential and Commercial Electrical Wiring.
Prentice Hall,
P.O. Box 11071,
Des Moines, IA 50336.
(800) 374-1200. FAX: (800) 835-5327.
INTERNET: www.phdirect.com

National Electrical Code.
National Fire Protection Association
11 Tracy Drive,
Avon, MA 02322.
(800) 344-3555. FAX: (800) 593-6372.
INTERNET: www.nfpa.org

National Electrical Code Handbook.
National Fire Protection Association,
11 Tracy Drive,
Avon, MA 02322.
(800) 344-3555. FAX: (800) 593-6372.
INTERNET: www.nfpa.org

Residential Wiring.
Craftsman Book Company,
P.O. Box 6500,
Carlsbad, CA 92018.
(800) 829-8123. FAX: (619) 438-0398.
INTERNET: www.craftsman-book.com

TIA/EIA 95-B; TIA/EIA 222-F; TIA/EIA 232-F; TIA/EIA 568-A; TIA/EIA 569-A; TIA/EIA 606; TIA/EIA 607; TIA/EIA TSB31-B.
Global Engineering Documents,
15 Inverness Way East,
Englewood, CO 80112-5704.
(800) 854-7179.
INTERNET: www.tiaonline.org

Ugly's Electrical References.
Burleson Distributing Corporation,
3501 Oak Forest Drive,
Houston, TX 77018-6121.
(800) 531-1660. FAX: (713) 956-6576.
INTERNET: www.nfpa.org

*Publisher information is current as of 10/01*

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