CO Electrical Signs Contractor Exam
Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
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1. Which NEC article primarily governs electric signs and outline
lighting installations, including their wiring and associated
equipment?
A. Article 600
B. Article 625
C. Article 680
D. Article 725
Answer: A. Article 600
Rationale: Article 600 specifically addresses electric signs and outline
lighting, including installation requirements for conductors, equipment,
disconnecting means, grounding, and other components associated with
electric signs.
2. Under NEC requirements for electric signs, what is the primary
purpose of a disconnecting means located at an electric sign?
,A. To increase the operating voltage of the sign
B. To provide a means to disconnect the sign from its supply circuit for
servicing
C. To automatically correct voltage fluctuations
D. To eliminate the need for overcurrent protection
Answer: B. To provide a means to disconnect the sign from its supply
circuit for servicing
Rationale: A sign disconnecting means permits the sign and associated
equipment to be safely de-energized before maintenance, inspection,
repair, or replacement work is performed.
3. When an electric sign is supplied from a branch circuit, which device
is primarily responsible for protecting the branch-circuit conductors
from excessive current?
A. Transformer
B. Photocell
C. Overcurrent protective device
D. Ballast
Answer: C. Overcurrent protective device
Rationale: Circuit breakers and fuses provide overcurrent protection by
limiting current to levels that the circuit conductors and connected
equipment are designed to withstand.
4. What is the principal function of a sign transformer used with a
neon or other high-voltage electric sign?
,A. To convert alternating current into mechanical energy
B. To provide the required secondary voltage for the sign system
C. To eliminate the grounding conductor
D. To increase branch-circuit frequency
Answer: B. To provide the required secondary voltage for the sign
system
Rationale: Sign transformers supply the voltage required by the sign's
high-voltage lighting components while isolating the secondary circuit
from the normal utilization voltage supplied by the branch circuit.
5. Which conductor is generally required to be connected to the
grounding terminal of metal sign equipment?
A. Equipment grounding conductor
B. Neutral conductor only
C. Photocell control conductor
D. Uninsulated secondary conductor only
Answer: A. Equipment grounding conductor
Rationale: The equipment grounding conductor provides a low-
impedance path for fault current so that overcurrent protection can
operate and exposed conductive parts do not remain energized under
fault conditions.
6. What is the primary hazard created when an exposed metal sign
enclosure is not properly grounded?
, A. Reduced illumination
B. Excessive lamp life
C. Electrical shock from an energized enclosure
D. Excessive power-factor correction
Answer: C. Electrical shock from an energized enclosure
Rationale: A fault that energizes an ungrounded metal enclosure can
create a serious shock hazard because there may be no effective fault-
current path to operate the overcurrent protective device.
7. Before servicing an electric sign, what should be done first when
practical?
A. Remove the grounding conductor
B. De-energize the sign using the appropriate disconnecting means
C. Increase the transformer output
D. Remove the sign's identification label
Answer: B. De-energize the sign using the appropriate disconnecting
means
Rationale: De-energizing the equipment before servicing reduces the risk
of electrical shock, arc flash, and accidental energization of components
being handled.
8. What is the primary purpose of an equipment grounding conductor
in an electric sign installation?
A. To carry normal operating current continuously
B. To provide a fault-current path
Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. Which NEC article primarily governs electric signs and outline
lighting installations, including their wiring and associated
equipment?
A. Article 600
B. Article 625
C. Article 680
D. Article 725
Answer: A. Article 600
Rationale: Article 600 specifically addresses electric signs and outline
lighting, including installation requirements for conductors, equipment,
disconnecting means, grounding, and other components associated with
electric signs.
2. Under NEC requirements for electric signs, what is the primary
purpose of a disconnecting means located at an electric sign?
,A. To increase the operating voltage of the sign
B. To provide a means to disconnect the sign from its supply circuit for
servicing
C. To automatically correct voltage fluctuations
D. To eliminate the need for overcurrent protection
Answer: B. To provide a means to disconnect the sign from its supply
circuit for servicing
Rationale: A sign disconnecting means permits the sign and associated
equipment to be safely de-energized before maintenance, inspection,
repair, or replacement work is performed.
3. When an electric sign is supplied from a branch circuit, which device
is primarily responsible for protecting the branch-circuit conductors
from excessive current?
A. Transformer
B. Photocell
C. Overcurrent protective device
D. Ballast
Answer: C. Overcurrent protective device
Rationale: Circuit breakers and fuses provide overcurrent protection by
limiting current to levels that the circuit conductors and connected
equipment are designed to withstand.
4. What is the principal function of a sign transformer used with a
neon or other high-voltage electric sign?
,A. To convert alternating current into mechanical energy
B. To provide the required secondary voltage for the sign system
C. To eliminate the grounding conductor
D. To increase branch-circuit frequency
Answer: B. To provide the required secondary voltage for the sign
system
Rationale: Sign transformers supply the voltage required by the sign's
high-voltage lighting components while isolating the secondary circuit
from the normal utilization voltage supplied by the branch circuit.
5. Which conductor is generally required to be connected to the
grounding terminal of metal sign equipment?
A. Equipment grounding conductor
B. Neutral conductor only
C. Photocell control conductor
D. Uninsulated secondary conductor only
Answer: A. Equipment grounding conductor
Rationale: The equipment grounding conductor provides a low-
impedance path for fault current so that overcurrent protection can
operate and exposed conductive parts do not remain energized under
fault conditions.
6. What is the primary hazard created when an exposed metal sign
enclosure is not properly grounded?
, A. Reduced illumination
B. Excessive lamp life
C. Electrical shock from an energized enclosure
D. Excessive power-factor correction
Answer: C. Electrical shock from an energized enclosure
Rationale: A fault that energizes an ungrounded metal enclosure can
create a serious shock hazard because there may be no effective fault-
current path to operate the overcurrent protective device.
7. Before servicing an electric sign, what should be done first when
practical?
A. Remove the grounding conductor
B. De-energize the sign using the appropriate disconnecting means
C. Increase the transformer output
D. Remove the sign's identification label
Answer: B. De-energize the sign using the appropriate disconnecting
means
Rationale: De-energizing the equipment before servicing reduces the risk
of electrical shock, arc flash, and accidental energization of components
being handled.
8. What is the primary purpose of an equipment grounding conductor
in an electric sign installation?
A. To carry normal operating current continuously
B. To provide a fault-current path
