• California CSLB
C10 Electrical 09/11/2026
Exam
CSLB C10 Test 1 | 120 Questions and Answers
() (Verified Answers) COMPLETE
FREQUENTLY MOST TESTED QUESTIONS WITH
COMPLETE SOLUTION /GET IT 100%
ACCURATE!(Graded A+)
What is the purpose of the National Electrical Code?
a. The purpose of this Code is the practical safeguarding of persons and property from hazards arising from the
use of electricity.
b. Design manual
c. To help electrical inspectors slow down electricians & make it harder for them to do their jobs
d. Efficient, convenient, way to install electrical systems
a. The purpose of this Code is the practical safeguarding of persons and property from hazards arising from the
use of electricity.
P 1
, • California CSLB
C10 Electrical 09/11/2026
Exam
REFERENCES: National Electrical Code (NEC) 90.1 Purpose
An arc flash can produce temperatures of ____°F.
a. 3,500
b. 15,000
c. 25,000
d. 35,000
d. 35,000
REFERENCES: NFPA 70E Arc Flash Hazards
As defined in Article 100, a dwelling unit has the following feature(s): ____.
a. permanent provisions for living, sleeping, cooking, and sanitation
b. living, sleeping, and basement or storage areas
c. space for eating, sleeping, and recreation
d. optional garage space
a. permanent provisions for living, sleeping, cooking, and sanitation
REFERENCES: Article 100 Definitions
All measurements in the National Electrical Code are shown in which system(s) of units?
a. inch-pound (English) only
b. SI (metric) only
c. both inch-pound (English) and metric (SI) values
d. both natural units and physical units
c. both inch-pound (English) and metric (SI) values
REFERENCES: 90.9
Nationally Recognized Testing Laboratories (NRTL) ____ electrical products to provide a basis for approval by
inspectors in the field.
a. approve
b. test and list
P 2
, • California CSLB
C10 Electrical 09/11/2026
Exam
c. develop standards
d. Endorse
b. test and list
REFERENCES: NEC Article 100 and Listed Equipment and Nationally Recognized Testing Laboratories (NRTL)
Always ____________________ the power before working on an electrical circuit.
a. ask for a Journeyman's help at
b. call the utility at
c. turn on
d. turn off
d. turn off
REFERENCES: Safety Cannot Be Compromised! The safest way to work on a circuit is to turn it OFF.
Every time an electrician or technician makes a decision concerning residential electrical wiring, the decision
should be checked by
referencing the ____________________.
a. NEC
b. OSHA handbook
c. Neighbor that works as a carpenter & did his own electrical for his own house 10 years ago
d. Carbonaro Effect
a. NEC
REFERENCES: 90.2
8. The authority having jurisdiction over electrical construction and enforcing the NEC is generally the
____________________.
a. Project Manager
b. Journeyman Electrician
c. Electrical Inspector
d. Homeowner
c. Electrical Inspector
REFERENCES: 90.4
P 3
, • California CSLB
C10 Electrical 09/11/2026
Exam
The use of the word shall indicates a(n) ____________________ rule.
a. Mandatory
b. Optional
c. Not mandatory
d. Informational recommendation only
a. Mandatory
REFERENCES: 90.5
What is the NEC definition of a "Qualified Person" according to Article 100 in the NEC?
a. Master Electrician
b. One who has the skills and knowledge related to the construction and operation of the electrical equipment
and
installations and has received safety training to recognize and avoid the hazards involved
c. Project Manager
d. Electrical Inspector
b. One who has the skills and knowledge related to the construction and operation of the electrical equipment
and
installations and has received safety training to recognize and avoid the hazards involved
REFERENCES: NEC Article 100
A device's primary function is to ____.
a. utilize electric energy
b. control electric energy
c. transform electric energy
d. act as a resistor
b. control electric energy
REFERENCES: 100
Which piece of electrical equipment is NOT considered a device?
a. receptacle
b. three-way switch
c. lamp
d. disconnect switch
P 4
C10 Electrical 09/11/2026
Exam
CSLB C10 Test 1 | 120 Questions and Answers
() (Verified Answers) COMPLETE
FREQUENTLY MOST TESTED QUESTIONS WITH
COMPLETE SOLUTION /GET IT 100%
ACCURATE!(Graded A+)
What is the purpose of the National Electrical Code?
a. The purpose of this Code is the practical safeguarding of persons and property from hazards arising from the
use of electricity.
b. Design manual
c. To help electrical inspectors slow down electricians & make it harder for them to do their jobs
d. Efficient, convenient, way to install electrical systems
a. The purpose of this Code is the practical safeguarding of persons and property from hazards arising from the
use of electricity.
P 1
, • California CSLB
C10 Electrical 09/11/2026
Exam
REFERENCES: National Electrical Code (NEC) 90.1 Purpose
An arc flash can produce temperatures of ____°F.
a. 3,500
b. 15,000
c. 25,000
d. 35,000
d. 35,000
REFERENCES: NFPA 70E Arc Flash Hazards
As defined in Article 100, a dwelling unit has the following feature(s): ____.
a. permanent provisions for living, sleeping, cooking, and sanitation
b. living, sleeping, and basement or storage areas
c. space for eating, sleeping, and recreation
d. optional garage space
a. permanent provisions for living, sleeping, cooking, and sanitation
REFERENCES: Article 100 Definitions
All measurements in the National Electrical Code are shown in which system(s) of units?
a. inch-pound (English) only
b. SI (metric) only
c. both inch-pound (English) and metric (SI) values
d. both natural units and physical units
c. both inch-pound (English) and metric (SI) values
REFERENCES: 90.9
Nationally Recognized Testing Laboratories (NRTL) ____ electrical products to provide a basis for approval by
inspectors in the field.
a. approve
b. test and list
P 2
, • California CSLB
C10 Electrical 09/11/2026
Exam
c. develop standards
d. Endorse
b. test and list
REFERENCES: NEC Article 100 and Listed Equipment and Nationally Recognized Testing Laboratories (NRTL)
Always ____________________ the power before working on an electrical circuit.
a. ask for a Journeyman's help at
b. call the utility at
c. turn on
d. turn off
d. turn off
REFERENCES: Safety Cannot Be Compromised! The safest way to work on a circuit is to turn it OFF.
Every time an electrician or technician makes a decision concerning residential electrical wiring, the decision
should be checked by
referencing the ____________________.
a. NEC
b. OSHA handbook
c. Neighbor that works as a carpenter & did his own electrical for his own house 10 years ago
d. Carbonaro Effect
a. NEC
REFERENCES: 90.2
8. The authority having jurisdiction over electrical construction and enforcing the NEC is generally the
____________________.
a. Project Manager
b. Journeyman Electrician
c. Electrical Inspector
d. Homeowner
c. Electrical Inspector
REFERENCES: 90.4
P 3
, • California CSLB
C10 Electrical 09/11/2026
Exam
The use of the word shall indicates a(n) ____________________ rule.
a. Mandatory
b. Optional
c. Not mandatory
d. Informational recommendation only
a. Mandatory
REFERENCES: 90.5
What is the NEC definition of a "Qualified Person" according to Article 100 in the NEC?
a. Master Electrician
b. One who has the skills and knowledge related to the construction and operation of the electrical equipment
and
installations and has received safety training to recognize and avoid the hazards involved
c. Project Manager
d. Electrical Inspector
b. One who has the skills and knowledge related to the construction and operation of the electrical equipment
and
installations and has received safety training to recognize and avoid the hazards involved
REFERENCES: NEC Article 100
A device's primary function is to ____.
a. utilize electric energy
b. control electric energy
c. transform electric energy
d. act as a resistor
b. control electric energy
REFERENCES: 100
Which piece of electrical equipment is NOT considered a device?
a. receptacle
b. three-way switch
c. lamp
d. disconnect switch
P 4
