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C-7 – 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.
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*
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?
a. resistance
b. impedance
c. capacitance
d. attenuation
2. When running low voltage cables in a ceiling that is
being used for air handling, what type of cable should be installed?
a. fiber-optic cable
b. shielded cable
c. PVC-jacketed cable
d. plenum-rated
cable
3. What are the general wiring requirements for a 70 volt
background music-only sound system with minimal voltage drop?
a. one pair of No. 14 AWG
wire
b. one pair of No. 16 AWG
wire
c. one pair of No. 18 AWG
wire
d. one pair of No.
22 AWG wire
*All questions are written and reviewed by licensed
contractors who are actively working in the field*
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
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