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C10 – Electrical Contractor

An electrical contractor places, installs, erects or connects any electrical wires, fixtures, appliances, apparatus, raceways, conduits, solar photovoltaic cells or any part thereof, which generate, transmit, transform or utilize electrical energy in any form or for any purpose.

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

Content of the Examination

The Electrical (C-10) Examination is divided into five major sections. These sections are:

1. System Evaluation and Design (24%)

  • Existing system evaluation
  • Plan and specification interpretation
  • Electrical calculations
  • Code requirements
  • Material selection

2. Rough Wiring (25%)

  • System Layout
  • Clearance and accessibility requirements
  • Raceway and panel installation
  • Wire and equipment labeling
  • Grounding and bonding

3. Finish Wiring and Trim (20%)

  • Finish device placement and installation
  • Trims and sealants
  • System energizing and testing

4. Troubleshooting and Repair (13%)

  • Common electrical problems
  • Location, repair, and replacement of inoperable electrical wires/components
  • Selection and use of electrical testing equipment

5. Safety (18%)

  • Lock out/tag out procedures
  • Personal protective equipment (PPE)
  • Tools/equipment

*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. Which of the following colors should NOT be used for current-carrying wires?

  1. red
  2. black
  3. green
  4. white

2. Which of the following types of conductors may be used as an overhead feeder to a garage?

  1. THHN
  2. THWN
  3. MTW
  4. UF

3. What is the largest number of two-pole circuit breakers that can be used on a lighting and appliance branch circuit panelboard in a single cabinet?

  1. 14
  2. 21
  3. 34
  4. 42

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

Resources
American Electrician’s Handbook.
The McGraw-Hill Companies,
P.O. Box 182604,
Columbus, OH 43272.
(877) 833-5524
FAX: (614) 759-3749.
INTERNET: www.mcgrawhill.com

Cal/OSHA State of California Construction Safety Orders.
California Code of Regulations, Title 8,
Industrial Relations, Chapter 4, Subchapter 4,
Barclays Law Publishers,
P.O. Box 95767,
Chicago, IL 60694.
(800) 888-3600
FAX: (415) 732-8861.
INTERNET: ccr.oal.ca.gov

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

National Electrical Code.
National Fire Protection Association,
1 Batterymarch Park,
Quincy, MA 02169-7471.
(800) 344-3555
FAX: (617) 770-0700.
INTERNET: www.nfpa.org
National Electrical Code Handbook.
National Fire Protection Association,
1 Batterymarch Park,
Quincy, MA 02169-7471.
(800) 344-3555
FAX: (617) 770-0700.
INTERNET: www.nfpa.org
National Fire Alarm Code (NFPA 72).
National Fire Protection Association,
1 Batterymarch Park,
Quincy, MA 02169-7471.
(800) 344-3555
FAX: (617) 770-0700.
INTERNET: www.nfpa.org
Ugly’s Electrical References.
National Fire Protection Association,
1 Batterymarch Park,
Quincy, MA 02169-7471.
(800) 344-3555
FAX: (617) 770-0700.
INTERNET: www.nfpa.org

*Publisher information is current as of 8/04*

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