California C-45 Electrical Sign Contractor
Exam Questions and Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf
Section 1: Electrical Sign Fundamentals and Installation
Question 1
What is the primary function of a disconnecting means installed for an
electrically powered sign?
A. To increase the voltage supplied to the sign
B. To regulate the brightness of the sign
C. To disconnect the sign's electrical supply for servicing and
maintenance
D. To prevent all electrical faults from occurring
Rationale: A disconnecting means provides a way to isolate electrical
power from equipment so that servicing and maintenance can be
,performed safely. It does not regulate brightness or increase voltage,
and it cannot prevent every electrical fault. The disconnect must be
appropriately rated, installed, and accessible as required by applicable
electrical codes.
Question 2
Which electrical characteristic is measured in volts?
A. Electrical resistance
B. Electrical current
C. Electrical power
D. Electrical potential difference
Rationale: Voltage is the electrical potential difference between two
points in a circuit. It provides the driving force that moves electric
charge through a conductive path. Current is measured in amperes,
resistance in ohms, and power in watts.
Question 3
A sign draws 5 amperes at 120 volts. Assuming a single-phase circuit
with a power factor of 1, approximately how much electrical power
does it consume?
A. 24 watts
,B. 125 watts
C. 600 watts
D. 1,200 watts
Rationale: Electrical power in a single-phase circuit with a power
factor of 1 is calculated using P = V × I. Therefore, 120 volts × 5
amperes = 600 watts. This calculation is useful when determining sign
power consumption and evaluating circuit loading.
Question 4
What is the main purpose of an equipment grounding conductor in a
sign installation?
A. To carry normal operating current continuously
B. To increase the sign's operating voltage
C. To replace the circuit's overcurrent protection
D. To provide a low-impedance fault-current path that helps
protective devices operate
Rationale: An equipment grounding conductor connects exposed
conductive equipment parts to the electrical grounding system. If a
fault energizes a metal enclosure, the grounding path helps carry fault
, current so that a circuit breaker or fuse can interrupt the fault. It is not
intended to carry normal load current.
Question 5
What is the purpose of a sign's raceway?
A. To provide decorative illumination
B. To regulate the electrical current
C. To provide a protected pathway or enclosure for electrical
conductors and associated components
D. To increase the power factor of the sign
Rationale: A raceway provides mechanical protection and an
organized route for electrical conductors. Depending on the design, it
may also protect conductors from environmental exposure and
physical damage. Raceways must be selected and installed according
to their listing, environmental suitability, and applicable electrical
requirements.
Question 6
Which instrument is commonly used to measure electrical current
flowing through a conductor without disconnecting it?
A. Megohmmeter
Exam Questions and Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf
Section 1: Electrical Sign Fundamentals and Installation
Question 1
What is the primary function of a disconnecting means installed for an
electrically powered sign?
A. To increase the voltage supplied to the sign
B. To regulate the brightness of the sign
C. To disconnect the sign's electrical supply for servicing and
maintenance
D. To prevent all electrical faults from occurring
Rationale: A disconnecting means provides a way to isolate electrical
power from equipment so that servicing and maintenance can be
,performed safely. It does not regulate brightness or increase voltage,
and it cannot prevent every electrical fault. The disconnect must be
appropriately rated, installed, and accessible as required by applicable
electrical codes.
Question 2
Which electrical characteristic is measured in volts?
A. Electrical resistance
B. Electrical current
C. Electrical power
D. Electrical potential difference
Rationale: Voltage is the electrical potential difference between two
points in a circuit. It provides the driving force that moves electric
charge through a conductive path. Current is measured in amperes,
resistance in ohms, and power in watts.
Question 3
A sign draws 5 amperes at 120 volts. Assuming a single-phase circuit
with a power factor of 1, approximately how much electrical power
does it consume?
A. 24 watts
,B. 125 watts
C. 600 watts
D. 1,200 watts
Rationale: Electrical power in a single-phase circuit with a power
factor of 1 is calculated using P = V × I. Therefore, 120 volts × 5
amperes = 600 watts. This calculation is useful when determining sign
power consumption and evaluating circuit loading.
Question 4
What is the main purpose of an equipment grounding conductor in a
sign installation?
A. To carry normal operating current continuously
B. To increase the sign's operating voltage
C. To replace the circuit's overcurrent protection
D. To provide a low-impedance fault-current path that helps
protective devices operate
Rationale: An equipment grounding conductor connects exposed
conductive equipment parts to the electrical grounding system. If a
fault energizes a metal enclosure, the grounding path helps carry fault
, current so that a circuit breaker or fuse can interrupt the fault. It is not
intended to carry normal load current.
Question 5
What is the purpose of a sign's raceway?
A. To provide decorative illumination
B. To regulate the electrical current
C. To provide a protected pathway or enclosure for electrical
conductors and associated components
D. To increase the power factor of the sign
Rationale: A raceway provides mechanical protection and an
organized route for electrical conductors. Depending on the design, it
may also protect conductors from environmental exposure and
physical damage. Raceways must be selected and installed according
to their listing, environmental suitability, and applicable electrical
requirements.
Question 6
Which instrument is commonly used to measure electrical current
flowing through a conductor without disconnecting it?
A. Megohmmeter
