TDLR – SIGN ELECTRICIAN EXAM PRACTICE QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS RATIONALE 2027 Q&A| INSTANT
DOWNLOAD PDF.– QUESTIONS AND ANSWERS | VERIFIED AND WELL
DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST
EXAM UPDATE
Core Domains
National Electrical Code (NEC) Article 600 – Electric Signs and Outline Lighting
TDLR Administrative Rules and Licensing Law
Electrical Theory and Circuit Calculations
Grounding, Bonding, and Equipment Grounding Conductors
Neon Transformers and High-Voltage Secondary Circuits
LED Drivers, Power Supplies, and Class 2 Circuits
Wiring Methods and Materials for Sign Systems
Overcurrent Protection and Disconnecting Means
Safety Standards and Professional Ethics
Introduction
The TDLR Sign Electrician Exam assesses the competency of candidates seeking
licensure to install, maintain, and repair electrical signs and outline lighting in
Texas. The examination evaluates knowledge of National Electrical Code
Article 600, TDLR Administrative Rules, grounding and bonding principles, and
safe work practices specific to sign systems. Questions are primarily multiple-
choice with scenario-based applications requiring critical thinking and real-
world decision-making. Candidates must demonstrate understanding of
,regulatory compliance, electrical theory, and practical installation standards to
ensure public safety and code-compliant workmanship in the sign industry.
SECTION ONE: QUESTIONS 1–50
Question 1
What is the primary function of a disconnecting means in an outdoor sign
circuit?
A. To reduce voltage to the sign transformer
B. To allow safe maintenance and emergency shutdown
C. To increase current flow to the sign
D. To provide overload protection for the transformer
🟢 Correct Answer: B. To allow safe maintenance and emergency shutdown
🔴 Rationale: A disconnecting means provides a safe method to de-energize
the sign circuit for maintenance, repair, and emergency situations. This is a
critical safety requirement under NEC Article 600.
Question 2
Which NEC Article specifically addresses the installation, grounding, and
maintenance of electric signs and outline lighting?
A. Article 250 – Grounding and Bonding
B. Article 300 – Wiring Methods
C. Article 600 – Electric Signs and Outline Lighting
D. Article 725 – Class 1, Class 2, and Class 3 Remote-Control Circuits
🟢 Correct Answer: C. Article 600 – Electric Signs and Outline Lighting
🔴 Rationale: Article 600 is the dedicated NEC section for electric signs and
outline lighting, providing comprehensive requirements for installation,
,grounding, and maintenance of these systems.
Question 3
According to NEC 600.5(A), what is the minimum rating for a sign outlet
required at each commercial building entrance accessible to pedestrians?
A. 15 amperes
B. 20 amperes
C. 30 amperes
D. 50 amperes
🟢 Correct Answer: B. 20 amperes
🔴 Rationale: NEC 600.5(A) requires each commercial building accessible to
pedestrians to have at least one 20-ampere sign outlet at each entrance. This
ensures adequate capacity for sign loads.
Question 4
A sign disconnect is not located within sight of the sign. According to NEC
requirements, the disconnect must be:
A. Marked with a red "Danger" sign
B. Permanently bridged
C. Capable of being locked in the open position
D. Installed in a NEMA 3R enclosure
🟢 Correct Answer: C. Capable of being locked in the open position
🔴 Rationale: NEC 600.6(A)(1) permits remote disconnects only if they are
lockable and the locking provision remains in place, ensuring the circuit
cannot be inadvertently re-energized during servicing.
Question 5
, What is the basic unit of electrical current?
A. Volt
B. Ohm
C. Ampere
D. Watt
🟢 Correct Answer: C. Ampere
🔴 Rationale: An ampere (amp) is the SI unit used to measure the flow of
electric current. It represents the rate of electron flow past a given point in a
circuit.
Question 6
A sign contractor is installing a 120 V branch circuit feeding an LED driver
with a continuous load of 16 A. Under NEC continuous-load rules, what is
the minimum overcurrent device rating required?
A. 15 A
B. 20 A
C. 25 A
D. 30 A
🟢 Correct Answer: B. 20 A
🔴 Rationale: Continuous loads must be sized at 125% of the load. 16 A ×
1.25 = 20 A. A 20 A overcurrent device is the minimum standard rating that
satisfies this requirement.
Question 7
Metal parts of signs shall be bonded to the:
ANSWERS (VERIFIED ANSWERS) PLUS RATIONALE 2027 Q&A| INSTANT
DOWNLOAD PDF.– QUESTIONS AND ANSWERS | VERIFIED AND WELL
DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST
EXAM UPDATE
Core Domains
National Electrical Code (NEC) Article 600 – Electric Signs and Outline Lighting
TDLR Administrative Rules and Licensing Law
Electrical Theory and Circuit Calculations
Grounding, Bonding, and Equipment Grounding Conductors
Neon Transformers and High-Voltage Secondary Circuits
LED Drivers, Power Supplies, and Class 2 Circuits
Wiring Methods and Materials for Sign Systems
Overcurrent Protection and Disconnecting Means
Safety Standards and Professional Ethics
Introduction
The TDLR Sign Electrician Exam assesses the competency of candidates seeking
licensure to install, maintain, and repair electrical signs and outline lighting in
Texas. The examination evaluates knowledge of National Electrical Code
Article 600, TDLR Administrative Rules, grounding and bonding principles, and
safe work practices specific to sign systems. Questions are primarily multiple-
choice with scenario-based applications requiring critical thinking and real-
world decision-making. Candidates must demonstrate understanding of
,regulatory compliance, electrical theory, and practical installation standards to
ensure public safety and code-compliant workmanship in the sign industry.
SECTION ONE: QUESTIONS 1–50
Question 1
What is the primary function of a disconnecting means in an outdoor sign
circuit?
A. To reduce voltage to the sign transformer
B. To allow safe maintenance and emergency shutdown
C. To increase current flow to the sign
D. To provide overload protection for the transformer
🟢 Correct Answer: B. To allow safe maintenance and emergency shutdown
🔴 Rationale: A disconnecting means provides a safe method to de-energize
the sign circuit for maintenance, repair, and emergency situations. This is a
critical safety requirement under NEC Article 600.
Question 2
Which NEC Article specifically addresses the installation, grounding, and
maintenance of electric signs and outline lighting?
A. Article 250 – Grounding and Bonding
B. Article 300 – Wiring Methods
C. Article 600 – Electric Signs and Outline Lighting
D. Article 725 – Class 1, Class 2, and Class 3 Remote-Control Circuits
🟢 Correct Answer: C. Article 600 – Electric Signs and Outline Lighting
🔴 Rationale: Article 600 is the dedicated NEC section for electric signs and
outline lighting, providing comprehensive requirements for installation,
,grounding, and maintenance of these systems.
Question 3
According to NEC 600.5(A), what is the minimum rating for a sign outlet
required at each commercial building entrance accessible to pedestrians?
A. 15 amperes
B. 20 amperes
C. 30 amperes
D. 50 amperes
🟢 Correct Answer: B. 20 amperes
🔴 Rationale: NEC 600.5(A) requires each commercial building accessible to
pedestrians to have at least one 20-ampere sign outlet at each entrance. This
ensures adequate capacity for sign loads.
Question 4
A sign disconnect is not located within sight of the sign. According to NEC
requirements, the disconnect must be:
A. Marked with a red "Danger" sign
B. Permanently bridged
C. Capable of being locked in the open position
D. Installed in a NEMA 3R enclosure
🟢 Correct Answer: C. Capable of being locked in the open position
🔴 Rationale: NEC 600.6(A)(1) permits remote disconnects only if they are
lockable and the locking provision remains in place, ensuring the circuit
cannot be inadvertently re-energized during servicing.
Question 5
, What is the basic unit of electrical current?
A. Volt
B. Ohm
C. Ampere
D. Watt
🟢 Correct Answer: C. Ampere
🔴 Rationale: An ampere (amp) is the SI unit used to measure the flow of
electric current. It represents the rate of electron flow past a given point in a
circuit.
Question 6
A sign contractor is installing a 120 V branch circuit feeding an LED driver
with a continuous load of 16 A. Under NEC continuous-load rules, what is
the minimum overcurrent device rating required?
A. 15 A
B. 20 A
C. 25 A
D. 30 A
🟢 Correct Answer: B. 20 A
🔴 Rationale: Continuous loads must be sized at 125% of the load. 16 A ×
1.25 = 20 A. A 20 A overcurrent device is the minimum standard rating that
satisfies this requirement.
Question 7
Metal parts of signs shall be bonded to the:
