CALIFORNIA ELECTRICAL CONTRACTOR (C-
10) LICENSE EXAM ACTUAL PREP QUESTIONS
AND WELL REVISED ANSWERS - LATEST AND
COMPLETE UPDATE WITH VERIFIED
SOLUTIONS – ASSURES PASS
1. Which of the following is the primary purpose of the National Electrical
Code (NEC)?
A. To establish pricing standards for electrical contractors
B. To regulate employment of electricians
C. To ensure safe installation of electrical wiring and equipment
D. To set licensing requirements for contractors
The NEC provides guidelines to protect people and property from electrical
hazards through safe design and installation practices.
2. Before beginning an electrical installation, a contractor must first obtain:
A. Equipment warranties
B. A building permit
C. A labor union approval
D. An insurance certificate
A building permit ensures that installations meet local and state safety codes
and are subject to inspection.
3. What is the minimum size copper grounding electrode conductor (GEC)
required for a 200-amp service?
A. 6 AWG
B. 4 AWG
C. 2 AWG
, D. 8 AWG
The NEC specifies minimum conductor sizes based on service rating; for
200-amp services, 4 AWG copper is required.
4. Which of the following describes a GFCI (Ground Fault Circuit Interrupter)?
A. A device that measures voltage
B. A device that stores energy
C. A device that protects people from electrical shock by detecting
current leakage
D. A device that steps down voltage
GFCIs detect current leakage to ground and interrupt the circuit to prevent
electric shock.
5. In California, a licensed electrical contractor is required to:
A. Only supervise apprentices
B. Perform inspections
C. Pull permits for electrical work and ensure code compliance
D. Work without any permits if under $500
California law mandates licensed contractors to obtain permits and comply
with code standards.
6. Which type of conduit is approved for outdoor use and direct burial?
A. EMT
B. RMC (Rigid Metal Conduit)
C. FMC
D. ENT
RMC is durable, corrosion-resistant, and suitable for direct burial
applications.
7. When sizing a service conductor, which of the following is a key factor?
A. Color of insulation
, B. Total load demand in amps
C. Type of building paint
D. Number of doors in the building
Conductor size must safely carry the expected load without overheating.
8. The term “ampacity” refers to:
A. Voltage drop in a circuit
B. The maximum current a conductor can safely carry
C. Transformer efficiency
D. Electrical resistance
Ampacity is the safe current-carrying capacity of a wire as determined by
NEC tables.
9. What is the maximum spacing allowed for a standard residential ceiling
outlet?
A. 6 feet
B. 12 feet
C. 18 feet
D. 24 feet
NEC requires receptacles so that no point along a wall is more than 6 feet
from an outlet, effectively spacing them no more than 12 feet apart.
10.For a 120/240-volt single-phase dwelling, what type of wiring is most
commonly used?
A. Aluminum conduit only
B. Non-metallic sheathed cable (NM-B)
C. RMC with copper only
D. MC cable only
NM-B (Romex) is widely used in residential wiring for simplicity and NEC
compliance.
, 11.The main purpose of a bonding jumper is to:
A. Increase voltage
B. Reduce conductor size
C. Ensure electrical continuity between metal parts
D. Decrease resistance of a resistor
Bonding jumpers connect metal components to prevent shock hazards.
12.In California, how long must an electrical contractor keep records of work
performed?
A. 6 months
B. 1 year
C. 3 years
D. 5 years
California Contractors State License Board (CSLB) requires records
retention for three years.
13.What color is typically used for an equipment grounding conductor?
A. Red
B. Blue
C. Green or bare
D. Yellow
NEC specifies green or bare copper for grounding conductors.
14.Which type of breaker is designed to protect against short circuits and
overloads?
A. GFCI
B. AFCI
C. Standard circuit breaker
D. Surge protector
10) LICENSE EXAM ACTUAL PREP QUESTIONS
AND WELL REVISED ANSWERS - LATEST AND
COMPLETE UPDATE WITH VERIFIED
SOLUTIONS – ASSURES PASS
1. Which of the following is the primary purpose of the National Electrical
Code (NEC)?
A. To establish pricing standards for electrical contractors
B. To regulate employment of electricians
C. To ensure safe installation of electrical wiring and equipment
D. To set licensing requirements for contractors
The NEC provides guidelines to protect people and property from electrical
hazards through safe design and installation practices.
2. Before beginning an electrical installation, a contractor must first obtain:
A. Equipment warranties
B. A building permit
C. A labor union approval
D. An insurance certificate
A building permit ensures that installations meet local and state safety codes
and are subject to inspection.
3. What is the minimum size copper grounding electrode conductor (GEC)
required for a 200-amp service?
A. 6 AWG
B. 4 AWG
C. 2 AWG
, D. 8 AWG
The NEC specifies minimum conductor sizes based on service rating; for
200-amp services, 4 AWG copper is required.
4. Which of the following describes a GFCI (Ground Fault Circuit Interrupter)?
A. A device that measures voltage
B. A device that stores energy
C. A device that protects people from electrical shock by detecting
current leakage
D. A device that steps down voltage
GFCIs detect current leakage to ground and interrupt the circuit to prevent
electric shock.
5. In California, a licensed electrical contractor is required to:
A. Only supervise apprentices
B. Perform inspections
C. Pull permits for electrical work and ensure code compliance
D. Work without any permits if under $500
California law mandates licensed contractors to obtain permits and comply
with code standards.
6. Which type of conduit is approved for outdoor use and direct burial?
A. EMT
B. RMC (Rigid Metal Conduit)
C. FMC
D. ENT
RMC is durable, corrosion-resistant, and suitable for direct burial
applications.
7. When sizing a service conductor, which of the following is a key factor?
A. Color of insulation
, B. Total load demand in amps
C. Type of building paint
D. Number of doors in the building
Conductor size must safely carry the expected load without overheating.
8. The term “ampacity” refers to:
A. Voltage drop in a circuit
B. The maximum current a conductor can safely carry
C. Transformer efficiency
D. Electrical resistance
Ampacity is the safe current-carrying capacity of a wire as determined by
NEC tables.
9. What is the maximum spacing allowed for a standard residential ceiling
outlet?
A. 6 feet
B. 12 feet
C. 18 feet
D. 24 feet
NEC requires receptacles so that no point along a wall is more than 6 feet
from an outlet, effectively spacing them no more than 12 feet apart.
10.For a 120/240-volt single-phase dwelling, what type of wiring is most
commonly used?
A. Aluminum conduit only
B. Non-metallic sheathed cable (NM-B)
C. RMC with copper only
D. MC cable only
NM-B (Romex) is widely used in residential wiring for simplicity and NEC
compliance.
, 11.The main purpose of a bonding jumper is to:
A. Increase voltage
B. Reduce conductor size
C. Ensure electrical continuity between metal parts
D. Decrease resistance of a resistor
Bonding jumpers connect metal components to prevent shock hazards.
12.In California, how long must an electrical contractor keep records of work
performed?
A. 6 months
B. 1 year
C. 3 years
D. 5 years
California Contractors State License Board (CSLB) requires records
retention for three years.
13.What color is typically used for an equipment grounding conductor?
A. Red
B. Blue
C. Green or bare
D. Yellow
NEC specifies green or bare copper for grounding conductors.
14.Which type of breaker is designed to protect against short circuits and
overloads?
A. GFCI
B. AFCI
C. Standard circuit breaker
D. Surge protector
