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This document contains a complete set of 120 multiple-choice and calculation-based practice questions with answers for the CSLB C10 Electrical Contractor License examination. Topics include electrical safety, wiring methods, grounding, voltage, current, l

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This document contains a complete set of 120 multiple-choice and calculation-based practice questions with answers for the CSLB C10 Electrical Contractor License examination. Topics include electrical safety, wiring methods, grounding, voltage, current, load calculations, transformers, and conduit installation. It is ideal for exam preparation and self-assessment for California electrical contractor licensing.

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CSLB C10
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Institution
CSLB C10
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CSLB C10

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Uploaded on
November 11, 2025
Number of pages
12
Written in
2025/2026
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Exam (elaborations)
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CSLB C10 Test 1
Study online at https://quizlet.com/_98ckib

1. What is the minimum working clearance from an 36"
electrical panel under 600 V?

2. Voltage drop in wire is a function of: Wire gauge, Length of wire,
Current flow in the wire

3. A 12-volt direct current, 13-watt fluorescent light is 156
controlled by a photocell. The average daily on-time
is 12 hours per day. How many watt-hours are con-
sumed by the light on an average day?

4. Where may you use nonmetallic-sheathed cable? inside floors and walls

5. What is the maximum permitted distance between 12'
convenience outlets in kitchens?

6. The minimum permitted size fixture wire is: No. 18

7. What is an Erickson coupling used for? to connect two sections of
rigid conduit when one sec-
tion cannot be turned

8. The smallest size grounding conductor permitted No. 8 copper
for service entrance is:

9. For an electric appliance with a 17.5 A load, the 25 amps
overcurrent device must not exceed:

10. A 5 kW appliance is used for 5 hours. At $0.014 per $0.35
kWh, the cost of running the appliance is:

11. If the plumber accidentally cuts installed wires, to general contractor
whom should you report the problem?




, CSLB C10 Test 1
Study online at https://quizlet.com/_98ckib

12. What is the maximum distance to an outlet from any 24"
point along the wall behind a kitchen counter?

13. Which of the following materials is not corrosive? enamel

14. 65 street lights are fed by a 2275-volt series circuit. 35 V
What is the voltage across each light?

15. What do you not take into consideration when do- small portable heating and
ing load demand calculations? cooling appliances

16. The symbol represents a: relay coil




17. A fixture that weighs more than ______ must be sup- 50 lb.
ported independently of an outlet box.

18. After installing a new A/C how would you test it? turn on the breaker and check
voltage

19. The symptoms of shock are: pale skin; sweaty; fast pulse

20. Of the following subtrades, which one must yield in concrete
the case of a dispute?

21. The following should not be used on a live circuit: ohmmeter

22. Which of the following applies to solar panels, met- They must be bonded and
al frames, and metal mounting equipment on a grounded.
roof-mounted PV system?

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