AZ L-45 Electrical Signs Contractor Exam
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Section 1: Electrical Sign Fundamentals and Safety
1. What is the primary purpose of a disconnecting means installed for
an electrically illuminated sign?
a. To increase the brightness of the sign
b. To reduce the operating voltage automatically
c. To disconnect the sign's electrical supply for servicing and
maintenance
d. To protect the sign from ultraviolet radiation
Rationale: A disconnecting means allows the electrical supply to be
safely isolated before servicing, repairing, or maintaining the sign. It
,helps protect workers from electrical shock and accidental
energization. It does not regulate voltage or control the brightness of
the sign.
2. Which organization publishes the National Electrical Code (NEC),
which contains requirements applicable to electrical signs?
a. Occupational Safety and Health Administration (OSHA)
b. National Fire Protection Association (NFPA)
c. International Organization for Standardization (ISO)
d. American Society of Civil Engineers (ASCE)
Rationale: The NFPA publishes NFPA 70, the National Electrical Code.
The NEC establishes electrical installation requirements intended to
protect people and property from electrical hazards. OSHA establishes
workplace safety requirements, while local jurisdictions determine
which electrical code edition is adopted and enforced.
3. Before beginning electrical sign installation, what should the
contractor do first?
a. Install the sign cabinet
b. Connect the sign to the nearest available circuit
,c. Review the approved plans, site conditions, and applicable code
requirements
d. Order the largest available circuit breaker
Rationale: Reviewing approved plans, site conditions, and applicable
codes helps ensure that the installation is properly designed and
coordinated. The contractor must identify power requirements,
mounting conditions, access limitations, permitting requirements, and
potential hazards before beginning work.
4. What is the primary function of an overcurrent protective device in a
sign circuit?
a. To increase the circuit's available voltage
b. To protect conductors against excessive current caused by
overloads or short circuits
c. To improve the color temperature of LED modules
d. To eliminate the need for grounding
Rationale: Fuses and circuit breakers protect electrical conductors by
interrupting current when it exceeds permitted limits under specified
conditions. Proper overcurrent protection helps prevent conductor
overheating and reduces fire hazards. It does not replace grounding or
other required protective measures.
, 5. Which instrument is commonly used to verify the presence or
absence of voltage during electrical troubleshooting?
a. Clamp meter used only for measuring current
b. Infrared thermometer
c. Properly rated voltage tester or multimeter
d. Measuring tape
Rationale: A properly rated voltage tester or multimeter can be used
to determine whether voltage is present. The instrument must be
suitable for the circuit's voltage and environment. Workers should
follow an appropriate verification procedure, including checking that
the tester functions correctly before and after testing.
6. What is the safest procedure before opening an electrical sign
enclosure for internal repairs?
a. Turn off the sign's illumination switch only
b. Wear insulated gloves and leave the circuit energized
c. De-energize the circuit, apply lockout/tagout where applicable, and
verify absence of voltage
d. Disconnect the sign's grounding conductor
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
Download Pdf
Section 1: Electrical Sign Fundamentals and Safety
1. What is the primary purpose of a disconnecting means installed for
an electrically illuminated sign?
a. To increase the brightness of the sign
b. To reduce the operating voltage automatically
c. To disconnect the sign's electrical supply for servicing and
maintenance
d. To protect the sign from ultraviolet radiation
Rationale: A disconnecting means allows the electrical supply to be
safely isolated before servicing, repairing, or maintaining the sign. It
,helps protect workers from electrical shock and accidental
energization. It does not regulate voltage or control the brightness of
the sign.
2. Which organization publishes the National Electrical Code (NEC),
which contains requirements applicable to electrical signs?
a. Occupational Safety and Health Administration (OSHA)
b. National Fire Protection Association (NFPA)
c. International Organization for Standardization (ISO)
d. American Society of Civil Engineers (ASCE)
Rationale: The NFPA publishes NFPA 70, the National Electrical Code.
The NEC establishes electrical installation requirements intended to
protect people and property from electrical hazards. OSHA establishes
workplace safety requirements, while local jurisdictions determine
which electrical code edition is adopted and enforced.
3. Before beginning electrical sign installation, what should the
contractor do first?
a. Install the sign cabinet
b. Connect the sign to the nearest available circuit
,c. Review the approved plans, site conditions, and applicable code
requirements
d. Order the largest available circuit breaker
Rationale: Reviewing approved plans, site conditions, and applicable
codes helps ensure that the installation is properly designed and
coordinated. The contractor must identify power requirements,
mounting conditions, access limitations, permitting requirements, and
potential hazards before beginning work.
4. What is the primary function of an overcurrent protective device in a
sign circuit?
a. To increase the circuit's available voltage
b. To protect conductors against excessive current caused by
overloads or short circuits
c. To improve the color temperature of LED modules
d. To eliminate the need for grounding
Rationale: Fuses and circuit breakers protect electrical conductors by
interrupting current when it exceeds permitted limits under specified
conditions. Proper overcurrent protection helps prevent conductor
overheating and reduces fire hazards. It does not replace grounding or
other required protective measures.
, 5. Which instrument is commonly used to verify the presence or
absence of voltage during electrical troubleshooting?
a. Clamp meter used only for measuring current
b. Infrared thermometer
c. Properly rated voltage tester or multimeter
d. Measuring tape
Rationale: A properly rated voltage tester or multimeter can be used
to determine whether voltage is present. The instrument must be
suitable for the circuit's voltage and environment. Workers should
follow an appropriate verification procedure, including checking that
the tester functions correctly before and after testing.
6. What is the safest procedure before opening an electrical sign
enclosure for internal repairs?
a. Turn off the sign's illumination switch only
b. Wear insulated gloves and leave the circuit energized
c. De-energize the circuit, apply lockout/tagout where applicable, and
verify absence of voltage
d. Disconnect the sign's grounding conductor
