Alabama Electrical Contractor Licensing
Examination Electrical Sign Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of the National Electrical Code (NEC)?
A. To design electrical systems
B. To provide minimum safety requirements for electrical installations
C. To calculate electrical loads
D. To certify electricians
Correct Answer: B
The NEC is not a design manual or certification system; it establishes
minimum safety standards to protect people and property from electrical
hazards.
2. Which organization publishes the NEC?
A. OSHA
B. IEEE
C. NFPA
D. ANSI
Correct Answer: C
The National Fire Protection Association (NFPA) publishes the NEC as NFPA
70, focusing on safe electrical installation practices.
,3. What color is typically used for grounded conductors in low-voltage sign
circuits?
A. Green
B. White
C. Black
D. Red
Correct Answer: B
White or gray is commonly used to identify grounded (neutral)
conductors, helping ensure proper identification and safety.
4. What is the minimum clearance required for overhead service drops above
sidewalks?
A. 8 ft
B. 10 ft
C. 12 ft
D. 15 ft
Correct Answer: C
NEC requires at least 12 feet of clearance over pedestrian areas to prevent
accidental contact with energized conductors.
5. Which device protects sign circuits from overloads and short circuits?
A. Transformer
B. Fuse or circuit breaker
C. Capacitor
D. Relay
Correct Answer: B
Fuses and circuit breakers interrupt excessive current flow, protecting
wiring and equipment from damage.
, 6. What is the purpose of grounding an electrical sign system?
A. Increase voltage
B. Reduce resistance
C. Provide a safe fault path
D. Improve brightness
Correct Answer: C
Grounding ensures fault current has a low-resistance path to earth,
reducing shock and fire hazards.
7. What type of current is typically used in modern LED sign systems?
A. AC only
B. DC
C. Mechanical current
D. Pulsating air current
Correct Answer: B
LED systems operate on DC power for stable, efficient light output and
reduced flicker.
8. What is the function of a transformer in signage?
A. Stores energy
B. Converts voltage levels
C. Measures resistance
D. Controls light color
Correct Answer: B
Transformers step voltage up or down to match the requirements of sign
components like neon or LED modules.
9. Which tool is used to measure voltage in sign circuits?
A. Clamp meter
B. Voltmeter
Examination Electrical Sign Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of the National Electrical Code (NEC)?
A. To design electrical systems
B. To provide minimum safety requirements for electrical installations
C. To calculate electrical loads
D. To certify electricians
Correct Answer: B
The NEC is not a design manual or certification system; it establishes
minimum safety standards to protect people and property from electrical
hazards.
2. Which organization publishes the NEC?
A. OSHA
B. IEEE
C. NFPA
D. ANSI
Correct Answer: C
The National Fire Protection Association (NFPA) publishes the NEC as NFPA
70, focusing on safe electrical installation practices.
,3. What color is typically used for grounded conductors in low-voltage sign
circuits?
A. Green
B. White
C. Black
D. Red
Correct Answer: B
White or gray is commonly used to identify grounded (neutral)
conductors, helping ensure proper identification and safety.
4. What is the minimum clearance required for overhead service drops above
sidewalks?
A. 8 ft
B. 10 ft
C. 12 ft
D. 15 ft
Correct Answer: C
NEC requires at least 12 feet of clearance over pedestrian areas to prevent
accidental contact with energized conductors.
5. Which device protects sign circuits from overloads and short circuits?
A. Transformer
B. Fuse or circuit breaker
C. Capacitor
D. Relay
Correct Answer: B
Fuses and circuit breakers interrupt excessive current flow, protecting
wiring and equipment from damage.
, 6. What is the purpose of grounding an electrical sign system?
A. Increase voltage
B. Reduce resistance
C. Provide a safe fault path
D. Improve brightness
Correct Answer: C
Grounding ensures fault current has a low-resistance path to earth,
reducing shock and fire hazards.
7. What type of current is typically used in modern LED sign systems?
A. AC only
B. DC
C. Mechanical current
D. Pulsating air current
Correct Answer: B
LED systems operate on DC power for stable, efficient light output and
reduced flicker.
8. What is the function of a transformer in signage?
A. Stores energy
B. Converts voltage levels
C. Measures resistance
D. Controls light color
Correct Answer: B
Transformers step voltage up or down to match the requirements of sign
components like neon or LED modules.
9. Which tool is used to measure voltage in sign circuits?
A. Clamp meter
B. Voltmeter
