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CSLB C-10 Electrical Contractor License Practice Exam, Exams of Electrical and Electronics Engineering

Chapman University Electrical and Electronics Engineering

A comprehensive practice exam for the cslb c-10 electrical contractor licensing, featuring 50 multiple-choice questions with answers. It covers essential topics such as nec code compliance, grounding, circuit protection, wiring methods, and safety regulations. The exam is designed to help candidates prepare for the california electrical license and ensures a thorough understanding of electrical standards and practices. It includes questions on conductor sizing, conduit requirements, gfci and afci protection, and working space clearances, making it an invaluable resource for exam preparation and professional development. This practice exam is an excellent tool for electrical professionals seeking to validate their knowledge and skills in electrical contracting.

Typology: Exams

2024/2025

Available from 05/29/2025

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“Comprehensive CSLB C-10 Electrical

Contractor Licensing Practice Exam – 50

Realistic Multiple-Choice Questions with

Answers for California Electrical License

Preparation and NEC Code Compliance”

1. According to the NEC, what is the maximum distance a receptacle outlet can be placed

from any point along a wall in a dwelling?

A. 4 feet

B. 6 feet

C. 12 feet ✅

D. 20 feet

2. What is the minimum wire size allowed for a 20-amp residential branch circuit?

A. 14 AWG

B. 12 AWG ✅

C. 10 AWG

D. 8 AWG

3. When installing a grounding electrode conductor, which of the following materials is

acceptable?

A. Aluminum wire

B. Copper wire ✅

C. Steel wire without coating

D. Plastic-coated wire

Partial preview of the text

Download CSLB C-10 Electrical Contractor License Practice Exam and more Exams Electrical and Electronics Engineering in PDF only on Docsity!

“Comprehensive CSLB C-10 Electrical

Contractor Licensing Practice Exam – 50

Realistic Multiple-Choice Questions with

Answers for California Electrical License

Preparation and NEC Code Compliance”

According to the NEC, what is the maximum distance a receptacle outlet can be placed from any point along a wall in a dwelling? A. 4 feet B. 6 feet C. 12 feet ✅ D. 20 feet
What is the minimum wire size allowed for a 20-amp residential branch circuit? A. 14 AWG B. 12 AWG ✅ C. 10 AWG D. 8 AWG
When installing a grounding electrode conductor, which of the following materials is acceptable? A. Aluminum wire B. Copper wire ✅ C. Steel wire without coating D. Plastic-coated wire

What is the maximum number of conductors allowed in a 4-inch conduit before derating is required? A. 9 B. 10 ✅ C. 12 D. 14
Which device is required to protect a 15-amp branch circuit in a residential kitchen? A. Ground Fault Circuit Interrupter (GFCI) B. Arc Fault Circuit Interrupter (AFCI) C. Both GFCI and AFCI ✅ D. Neither GFCI nor AFCI
When can aluminum wiring be used for branch circuits in a dwelling? A. Only if connected with wire nuts B. If it is rated and installed with proper connectors ✅ C. Never allowed D. Only for lighting circuits
What is the minimum clearance above a residential service panel for working space? A. 24 inches B. 30 inches C. 36 inches ✅ D. 48 inches
When connecting a subpanel in a detached garage, what must be done to the neutral and ground buses? A. They must be bonded together B. Only the neutral bus should be bonded C. Neutral and ground buses must be separated ✅ D. Only the ground bus should be bonded
What type of conduit is required for underground electrical wiring? A. EMT

C. Green or bare copper ✅ D. Red

When can flexible metal conduit (FMC) be used in a commercial installation? A. For all branch circuits B. Where flexibility is required for equipment connections ✅ C. As a replacement for rigid conduit underground D. For service entrance conductors
According to NEC, how many disconnects are required for a three-phase motor? A. One per phase B. One disconnecting means for all phases ✅ C. Two disconnects D. Three disconnects
What is the minimum depth required to bury PVC conduit for residential electrical wiring? A. 6 inches B. 12 inches C. 18 inches ✅ D. 24 inches
What is the purpose of an arc fault circuit interrupter (AFCI)? A. Protect against overloads B. Protect against ground faults C. Detect and interrupt arcing faults ✅ D. Prevent short circuits
How often should GFCI outlets be tested? A. Weekly B. Monthly C. Every 3 months ✅ D. Annually

When installing lighting in a damp location, what type of fixture should be used? A. Any fixture rated for indoor use B. Only fixtures with an open design C. Fixtures rated for damp locations ✅ D. Outdoor rated fixtures only
What is the maximum length allowed for a flexible cord used as a permanent wiring method? A. 3 feet B. 6 feet ✅ C. 10 feet D. 15 feet
Which of the following is required before working on energized electrical equipment? A. Notify the supervisor B. Wear rubber gloves C. Lockout/tagout procedure must be followed ✅ D. Use insulated tools only
What is the minimum size copper conductor for a 60-amp residential circuit? A. 10 AWG B. 6 AWG ✅ C. 8 AWG D. 4 AWG
In residential wiring, what color is typically used for the neutral conductor? A. Black B. Red C. White or gray ✅ D. Green
How often must electrical tools and equipment be inspected for safety? A. Monthly B. Before each use ✅

What is the required ampacity for a feeder supplying a dwelling unit with a 100-amp service? A. 60 amps B. 100 amps ✅ C. 125 amps D. 150 amps
What is the purpose of a conduit body? A. To protect conductors from physical damage B. To provide access for pulling and splicing wires ✅ C. To ground the conduit system D. To reduce electrical resistance
When installing lighting controls, what is the maximum wattage allowed per dimmer switch in a residential setting? A. 400 watts B. 600 watts C. 800 watts ✅ D. 1000 watts
Which of the following is the primary function of a circuit breaker? A. To ground the electrical system B. To detect electrical faults C. To interrupt current flow during overload or short circuit ✅ D. To regulate voltage
How many disconnecting means are required for a single-family dwelling? A. One main disconnect B. One disconnect per service panel C. One main disconnect with up to six breakers ✅ D. Two disconnects
What is the minimum size copper grounding electrode conductor for a 100-amp service?

A. 6 AWG

B. 8 AWG ✅

C. 10 AWG

D. 12 AWG

What is the maximum voltage drop recommended for branch circuits? A. 1% B. 2% C. 3% ✅ D. 5%
When installing smoke detectors in a new dwelling, how should they be powered? A. Battery-operated only B. Hardwired only C. Hardwired with battery backup ✅ D. Hardwired or battery-operated without backup
What type of wiring is allowed in hazardous locations? A. Nonmetallic sheathed cable B. Armored cable or conduit ✅ C. Flexible cords D. Open wiring
When using nonmetallic (NM) cable, what is the maximum allowable length between junction boxes? A. 50 feet B. No maximum length if cable is continuous and protected ✅ C. 100 feet D. 150 feet
What is the minimum size grounding electrode conductor required for a 200-amp residential service? A. 4 AWG

C. Plastic water pipe ✅ D. Ground rod

When installing a subpanel, how should neutral and ground wires be handled? A. Bonded together in subpanel B. Kept separate in subpanel ✅ C. Neutral grounded, ground isolated D. Neutral isolated, ground bonded
What is the NEC maximum number of conductors allowed in a 3/4 inch EMT conduit without derating? A. 8 B. 10 ✅ C. 12 D. 14
How many hours of continuing education in electrical law is required to renew a CSLB C-10 license every two years? A. 2 hours B. 4 hours ✅ C. 6 hours D. 8 hours
What is the maximum allowable voltage drop for feeders and branch circuits combined? A. 2% B. 3% C. 5% ✅ D. 10%